Accelerometer-measured Sedentary Time Research Articles

Concurrent validity between self-reported International Physical Activity Questionnaire Short Form and Fibion accelerometer data among young adults in the UAE

Self-reported physical activity questionnaires (e.g., International Physical Activity Questionnaire, IPAQ) are a cost-effective, time-saving, and accessible method to assess sedentary behaviour and physical activity. There are conflicting findings regarding the validity of self-reported questionnaires in comparison to accelerometer-measured data in a free-living environment. This study aimed to investigate the concurrent validity between self-reported Arabic–English IPAQ short form (IPAQ-SF) and Fibion (Fibion Inc., Jyväskylä, Finland) accelerometer-measured sedentary and physical activity time among young adults. One hundred and one young healthy adults (mean age 20.8 ± 2.4 years) filled in the IPAQ short form (IPAQ-SF) and wore the Fibion device on the anterior thigh for ≥ 600 min per day for 4–7 days. Concurrent validity between the IPAQ-SF and Fibion accelerometer for sitting, walking, moderate activity, and vigorous activity time was assessed using the Spearman correlation coefficient (ρ\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\\rho$$\\end{document}) and Bland–Altman plots. Significant weak associations between IPAQ-SF and Fibion measurements were found for total activity time (ρ\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\\rho$$\\end{document} = 0.4; P < 0.001) and for the duration of walking (ρ\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\\rho$$\\end{document} = 0.3; P = 0.01), moderate (ρ\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\\rho$$\\end{document} = 0.2; P = 0.02), and vigorous-intensity activities (ρ\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\\rho$$\\end{document} = 0.4; P < 0.001). However, ρ\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\\rho$$\\end{document} was not significant (ρ\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\\rho$$\\end{document} = − 0.2; P = 0.09) for sitting time. In addition, all the plots of the measured variables showed a proportional bias. A low association and agreement were found between self-reported IPAQ-SF scores and Fibion accelerometer measurements among young adults in the UAE. Adult sedentary and physical activity measurements should be obtained objectively with accelerometers rather than being limited to self-reported measures.

Accelerometer-based sedentary time and physical activity with MASLD and liver cirrhosis in 2684 British adolescents

Evidence on the long-term relationship of sedentary time (ST), light physical activity (LPA) and moderate-to-vigorous PA (MVPA) with liver steatosis, fibrosis, cirrhosis, and changes in liver enzymes in the paediatric population is limited. This study examined the associations of cumulative ST, LPA and MVPA from childhood with longitudinal changes in liver indices and enzymes. From the Avon Longitudinal Study of Parents and Children (ALSPAC), UK birth cohort, 2684 children aged 11 years who had at least one follow-up time-points accelerometer-measured ST, LPA and MVPA over a period of 13 years, and liver indices and enzymes measures at age 24 years clinic visit were included. Liver steatosis and fibrosis were assessed by transient elastography and staged as fibrosis stage F0-F4 and steatosis grade (S0-S3) at age 24 years. Alanine aminotransferase (ALT), aspartate aminotransferase (AST), and γ-glutamyl transferase (GGT) were assayed at ages 17 and 24 years. Longitudinal associations were examined using generalized linear mixed-effect models, while mediation analyses were conducted with structural equation models. Among 2684 children (mean [SD] age, 11.75 [0.24] years; 1537 [57.3%] females]), the prevalence of liver steatosis at age 17 years was 2.6% and 20.5% at age 24 years. The cumulative 1-minute/day increase in ST from ages 11–24 years was associated with higher odds of liver cirrhosis (odds ratio 1.004 [95% CI 1.002–1.005] p < 0.001) and severe liver steatosis (1.001 [1.001–1.002] p = 0.002) at age 24 years. Increased ST from childhood was directly associated with progressively increased ALT, AST and GGT from ages 17 to 24 years. Cumulative 1-min/day LPA was associated with lower odds of liver cirrhosis (0.990 [0.990–0.991] p < 0.001) and severe liver steatosis (0.999 [0.998–0.999] p < 0.001) at age 24 years, as well as decreased liver enzymes. Cumulative 1-min/day MVPA was associated with associated with lower odds of severe liver steatosis (0.996 [0.994–0.998] p < 0.001) but not liver cirrhosis at age 24 years. MVPA effect on lowering liver steatosis was significantly suppressed (64% suppression) by increased fat mass. In conclusion, increasing LPA, sustaining MVPA and decreasing ST from childhood may independently attenuate and reverse the risk of severe liver steatosis and liver cirrhosis by young adulthood.

Recent Cannabis Use and Accelerometer-Measured Physical Activity and Sedentary Behavior Among Young-to-Midlife Adults: An Analysis of the National Health and Nutrition Examination Survey from 2011 to 2014.

Introduction: Cannabis use has been associated with reduced physical activity and increased sedentary behavior in adolescents. In adults, however, there is no conclusive evidence of such an association, and existing studies have primarily relied on self-reported activity measures. As cannabis use increases globally, a deeper understanding of its relationship with activity levels may inform clinical counseling and guidelines. This study investigated the association between recent cannabis use and accelerometer-measured activity. Methods: Data were obtained from the National Health and Nutrition Examination Survey (NHANES) from 2011 to 2014. We included adults in the United States who responded to a cannabis questionnaire and had at least 4 days of activity data from an ActiGraph GT3X+ accelerometer, which comprised participants from 18 to 59 years. The primary exposure was any self-reported cannabis use in the past 30 days. The primary outcome was daily sedentary time and secondary outcomes were daily light physical activity (LPA) and moderate-to-vigorous physical activity (MVPA). Analyses were performed with multivariable quasi-Poisson regression models. Results: Of 4666 included adults, 658 (14.1%) reported recent cannabis use. After covariate adjustment, recent cannabis use was not associated with daily sedentary time (adjusted incidence rate ratio [aIRR] 0.99, 95% confidence interval [CI]: 0.98-1.01) or daily MVPA time (aIRR 1.01, 95% CI: 0.98-1.04). Daily LPA time was 4% greater with recent cannabis use (aIRR 1.04, 95% CI: 1.01-1.06). Conclusion: Recent cannabis use in young to midlife adults was not associated with accelerometer-measured sedentary or MVPA time, but it was associated with a marginal increase in LPA time of unclear clinical significance. Our findings provide evidence against existing concerns that cannabis use independently promotes sedentary behavior and decreases physical activity. Future prospective studies are needed to determine if these findings generalize to specific populations using cannabis including chronic pain patients.

Accelerometer-based sedentary time and physical activity from childhood through young adulthood with progressive cardiac changes: a 13-year longitudinal study.

Longitudinal evidence on the relationship of sedentary time (ST), light-intensity physical activity (LPA), and moderate-to-vigorous-intensity physical activity (MVPA) with changes in cardiac structure and function in the paediatric population is scarce. This evidence is clinically important due to the impact ST can have on the long-term prognosis of healthy young population in the lifetime continuum. This prospective observational study examined the relationships of cumulative ST, LPA, and MVPA from childhood with longitudinal changes in cardiac structure and function. This is a secondary analysis from the Avon Longitudinal Study of Parents and Children, UK birth cohort of 1682 children aged 11 years. Participants who had at least one follow-up timepoints accelerometer-measured ST, LPA, and MVPA over a period of 13 years and repeated echocardiography-measured cardiac structure and function at ages 17- and 24-year clinic visit were included. Left ventricular mass indexed for height2.7 (LVMI2.7) and left ventricular (LV) diastolic function from mitral E/A ratio (LVDF) were computed. Among 1682 children (mean [SD] age, 11.75 [0.24] years; 1054 [62.7%] females), the cumulative one-min/day increase in ST from ages 11 to 24 years was associated with progressively increased LVMI2.7 {effect estimate 0.002 g/m2.7 [confidence interval (CI) 0.001-0.003], P < 0.001}, irrespective of sex, obesity, and hypertensive status. Cumulative one-min/day increase in LPA was associated with a decreased LVMI2.7 (-0.005 g/m2.7 [-0.006 to -0.003], P < 0.0001) but an increased LVDF. Cumulative one-minute/day increase in MVPA was associated with progressively increased LVMI2.7 (0.003 g/m2.7 [0.001-0.006], P = 0.015). ST contributed +40% to the 7-year increase in cardiac mass, MVPA increased cardiac mass by +5%, but LPA reduced cardiac mass by -49%. Increased ST may have long-term pathologic effects on cardiac structure and function during growth from childhood through young adulthood; however, engaging in LPA may enhance cardiac health in the young population.

A multivariate multilevel approach to unravel the associations between individual and school factors on children's motor performance in the REACT project.

The aim was to (1) estimate the relationship between physical fitness (PF) and object control fundamental movement skills (FMS), (2) identify child characteristics that relate with PF and FMS, and (3) examine associations between the school environment, PF, and FMS. The sample included 1014 Portuguese children aged 6-10 years from the REACT project. PF was assessed via running speed, shuttle run, standing long jump, handgrip, and the PACER test. Object control FMS were assessed with stationary dribble, kick, catch, overhand throw, and underhand roll. Test performances were transformed into z-scores, and their sum was expressed as overall PF and FMS. Child-level variables included body mass index (BMI) z-scores, accelerometer-measured sedentary time and moderate-to-vigorous physical activity, and socioeconomic status (SES). School size, physical education classes, practice areas, and equipment were also assessed. Approximately, 90% of the variance in object control PF and FMS was at the child level, and 10% at the school level. The correlation between PF and object control FMS was .62, which declined to .43 with the inclusion of covariates. Older, more active, and higher SES children had higher object control PF and FMS, and boys outperformed girls. BMI was negatively associated with PF but not with object control FMS. Sedentary time and number of physical education classes were not significant predictors. Most school predictors did not jointly associate with PF and object control FMS. PF and object control FMS z-scores were moderately related. Not all child characteristics were associated with both PF and object control FMS, and their effect sizes were different. School characteristics only explained 10% of the total variation in PF and object control FMS.

Associations of Sedentary Time and Physical Activity From Childhood With Lipids: A 13-Year Mediation and Temporal Study.

Among children, evidence on long-term longitudinal associations of accelerometer-measured sedentary time, light physical activity (LPA), and moderate to vigorous PA (MVPA) with lipid indices are few. The mediating role of body composition and other metabolic indices in these associations remains unclear and whether poor movement behavior precedes altered lipid levels is unknown. This study examined the associations of sedentary time, LPA, and MVPA from childhood through young adulthood with increased lipids, the mediating role of body composition, and whether temporal interrelations exist. Data from 792 children (58% female; mean [SD] age at baseline, 11.7 [0.2] years), drawn from the Avon Longitudinal Study of Parents and Children (ALSPAC) UK birth cohort, who had at least 2 time-point measures of accelerometer-based sedentary time, LPA, and MVPA during clinic visits at ages 11, 15, and 24 years and complete fasting plasma high-density lipoprotein cholesterol, low-density lipoprotein cholesterol, triglyceride, and total cholesterol measured during follow-up visits at ages 15, 17, and 24 years were analyzed. Total fat mass partly mediated the inverse associations of LPA with low-density lipoprotein cholesterol by 13%, triglyceride by 28%, and total cholesterol by 6%. Total fat mass mediated the inverse associations of MVPA with low-density lipoprotein cholesterol by 37% and total cholesterol by 48%, attenuating the effect on total cholesterol to nonsignificance (P = .077). In the temporal path analyses, higher MVPA at age 15 years was associated with lower low-density lipoprotein cholesterol at 24 years (β = -0.08, SE, 0.01, P = .022) but not vice versa. Sedentary time worsens lipid indices, but increased LPA had a 5- to 8-fold total cholesterol-lowering effect and was more resistant to the attenuating effect of fat mass than MVPA.

Association of Accelerometer-Measured Sedentary Time and Physical Activity with Arterial Stiffness and Vascular Aging in the General Spanish Population, Analyzed by Sex.

In this study we analyzed the association between physical activity and sedentary lifestyle with vascular aging in Spanish populations aged 35-75 years. A cross-sectional study was developed, in which 501 subjects aged 35-75 years were recruited. Physical activity and sedentary time were measured with an accelerometer (Actigraph GTX3) for a week. We measured carotid-femoral pulse wave velocity (cfPWV) by a Sphygmo Cor® device and carotid intima-media thickness (cIMT) by ultrasound (Sonosite Micromax®). The vascular aging index (VAI) was calculated as described in the literature. Vascular aging was defined considering the 25th and 75th percentiles by age and sex of cfPWV and VAI, presence of vascular injury, type-2 diabetes mellitus or arterial hypertension. Individuals were classified into three groups: healthy, normal, and early vascular aging. The mean age of the sample was 55.90 14.24 years, 50% being women. Total physical activity was negatively associated with cfPWV ( = -0.454) and VAI ( = -1.845). Similarly, the number of steps per day obtained a negative association with cfPWV ( = -0.052) and VAI ( = -0.216), while sedentary time showed a positive association with cfPWV ( = 0.028) and VAI ( = 0.117). In the analysis by sex, the results showed similar values. The odds ratio (OR) of total physical activity of subjects classified as early vascular aging (EVA) with regarding those classified as healthy vascular aging (HVA) was 0.521 (95% confidence interval [CI] 0.317 to 0.856) for cfPWV, and 0.565 (95% CI 0.324 to 0.986) for VAI. In terms of the number of steps per day, the OR was 0.931 (95% CI 0.875 to 0.992) for cfPWV and 0.916 (95% CI 0.847 to 0.990) for VAI and for sedentary time the OR was 1.042 (95% CI 1.011 to 1.073) for cfPWV and 1.037 (95% CI 1.003 to 1.072) for VAI. The OR of subjects classified as vigorous physical activity was 0.196 (95% CI 0.041 to 0.941) using cfPWV and 0.161 (95% CI 0.032 to 0.820) using VAI. In the analysis by sex, the results showed an association in men when cfPWV was used and an association in women when VAI was used to define vascular aging. The results of this study indicate that the more time spent performing physical activity and the less sedentary time, the lower the arterial stiffness and the probability of developing early vascular aging. The study was registered in ClinicalTrials.gov (number: NCT02623894).

Cumulative accelerometer-based sedentary time from childhood through young adulthood with progressive left ventricular remodelling in British youth: a 13-year longitudinal study

Abstract Background Questionnaire-based sedentary time and behaviour has been associated with worse cardiometabolic profiles such as adiposity, insulin resistance, and blood pressure, in the pediatric population. However, objectively measured sedentary time has not been consistently associated with poor cardiometabolic health. Till date, there is no evidence of the cumulative effect of time spent sedentary assessed with an accelerometer and cardiac structural changes in youth. Purpose To investigate the longitudinal association of cumulative sedentary time from childhood through young adulthood with structural cardiac changes during growth from adolescence through young adulthood. Methods From the Avon Longitudinal Study of Parents and Children (ALSPAC), UK birth cohort, 766 children aged 11 years who had at least two follow-up time-points accelerometer-measured sedentary time over 13 years follow-up, and complete cardiac structural measures at age 17 years clinic visit were included. Sedentary time was assessed with ActiGraph accelerometer worn for 4-7 days at the 11-, 15-, and 24-year clinic visits. Repeated echocardiography measured left ventricular mass indexed for height2.7 (LVMI2.7) and relative wall thickness (RWT) were available at baseline and follow-up. Multivariable adjusted associations were examined using generalized linear mixed-effect models and adjusted for sex, and time-varying covariates measured at both baseline and follow-up such as age, insulin, high-sensitivity C-reactive protein, heart rate, systolic blood pressure, glucose, fat mass, lean mass, smoking status, family history of hypertension/diabetes/high cholesterol/vascular disease, socioeconomic status, triglyceride, low-density lipoprotein cholesterol, high-density lipoprotein cholesterol, light physical activity, and moderate to vigorous physical activity, Results Among 766 children (mean [SD] age, 11.75 [0.24] years; 422 [55.0%] females]) males spent on average 360, 467, and 527 minutes/day sedentary at ages 11, 15, and 24 years, respectively. Females spent 364, 481, and 535 minutes/day sedentary at ages 11, 15, and 24 years respectively. LVMI2.7 was significantly higher among males than females with an average difference of ∼4g/m2.7 both at ages 17 and 24 years but no significant sex differences in RWT. In a fully adjusted model, a 1-minute increase in sedentary time from ages 11 – 24 years was associated with progressively increased changes in LVMI2.7 (effect estimate 0.004g/m2.7 [CI 0.001 – 0.006] p=0.002) from ages 17 – 24 years in the total cohort and females (effect estimate 0.009g/m2.7 [CI 0.005 – 0.012] p&amp;lt;0.0001). There was no statistically significant longitudinal association between cumulative sedentary time and changes in RWT in the total cohort, males, and females. Conclusion Cumulative increase in sedentary time during growth from childhood through young adulthood was associated with progressive left ventricular structural remodelling.

Cumulative accelerometer-based sedentary time from childhood through young adulthood with increased arterial stiffness and carotid intima-media thickness in youth: a 13-year longitudinal study

Abstract Background Arterial stiffness and carotid intima-media thickness (cIMT) progression have been associated with cardiovascular morbidity and mortality in adulthood. Arterial stiffness is a strong risk factor for elevated blood pressure and hypertension, and insulin resistance in adolescents and young adults. It remains unclear whether cumulative sedentary time independently worsens arterial health in the paediatric population. Purpose To investigate the longitudinal association of cumulative sedentary time from childhood through young adulthood with arterial stiffness and cIMT changes during post-pubertal growth. Methods From the Avon Longitudinal Study of Parents and Children (ALSPAC), UK birth cohort, 1399 children aged 11 years who had at least two follow-up time-points accelerometer-measured sedentary time over 13 years follow-up, and complete cardiac structural measures at age 17 years clinic visit were included. Sedentary time was assessed with ActiGraph accelerometer worn for 4-7 days at the 11-, 15-, and 24-year clinic visits and sex-categorized in tertiles as low (reference), moderate, and high. Carotid femoral pulse wave velocity (cfPWV), a measure of arterial stiffness, and cIMT were assessed with Vicorder and ultrasound, respectively at ages 17 and 24 years. Multivariable adjusted associations were examined using generalized linear mixed-effect models and adjusted for sex, and time-varying covariates measured at both baseline and follow-up such as age, insulin, high-sensitivity C-reactive protein, heart rate, systolic blood pressure, glucose, fat mass, lean mass, smoking status, family history of hypertension/diabetes/high cholesterol/vascular disease, socioeconomic status, triglyceride, low-density lipoprotein cholesterol, high-density lipoprotein cholesterol, light physical activity, and moderate to vigorous physical activity, Results Among 1339 participants (mean [SD] age, 11.75 [0.24] years; [54.6% females]) males spent on average 358, 461, and 536 minutes/day sedentary at ages 11, 15, and 24 years, respectively. Females spent 369, 484, and 525 minutes/day sedentary at ages 11, 15, and 24 years respectively. cfPWV was significantly higher among males than females at ages 17 and 24 years. cIMT was higher in males than females at 17 years but not at age 24 years. In a fully adjusted model, the highest tertile of sedentary time from ages 11 – 24 years was cumulatively associated with progressively increased changes in cfPWV (effect estimate 0.009m/s [CI 0.006 – 0.012] p&amp;lt;0.001) from ages 17 – 24 years in the total cohort and females (0.047m/s [CI 0.005 – 0.090] p=0.030), but not in males. There was no statistically significant association between cumulative sedentary time and changes in cIMT in the total cohort, males, and females. Conclusion Cumulative increase in sedentary time during growth from childhood through young adulthood was independently associated with progressively worsening arterial stiffness in youth.

Cumulative accelerometer-based light physical activity from childhood through young adulthood with arterial stiffness and carotid intima-media thickness progression: a 13-year longitudinal study

Abstract Background Arterial stiffness is a novel risk factor for elevated blood pressure and hypertension in adolescents and young adults. Arterial stiffness and carotid intima-media thickness (cIMT) progression have been associated with cardiovascular events in adult. It remains unclear whether engaging in light physical activity may attenuate arterial stiffness and cIMT progression. Purpose To investigate the longitudinal association of cumulative light physical activity from childhood through young adulthood with arterial stiffness and cIMT progression. Methods From the Avon Longitudinal Study of Parents and Children (ALSPAC), UK birth cohort, 1399 children aged 11 years who had at least two follow-up time-points accelerometer-measured sedentary time over 13 years follow-up, and complete cardiac structural measures at age 17 years clinic visit were included. Light physical activity was assessed with ActiGraph accelerometer worn for 4-7 days at the 11-, 15-, and 24-year clinic visits and sex-categorized in tertiles as low (reference), moderate, and high. Carotid femoral pulse wave velocity (cfPWV), a measure of arterial stiffness, and cIMT were assessed with Vicorder and ultrasound, respectively at ages 17 and 24 years. Multivariable adjusted associations were examined using generalized linear mixed-effect models and adjusted for sex, and time-varying covariates measured at both baseline and follow-up such as age, insulin, high-sensitivity C-reactive protein, heart rate, systolic blood pressure, glucose, fat mass, lean mass, smoking status, family history of hypertension/diabetes/high cholesterol/vascular disease, socioeconomic status, triglyceride, low-density lipoprotein cholesterol, high-density lipoprotein cholesterol, sedentary time, and moderate to vigorous physical activity. Results Among 1339 participants (mean [SD] age, 11.75 [0.24] years; [54.6% females]) males spent on average 369, 289, and 150 mins/day engaging in light physical activity at ages 11, 15, and 24 years, respectively. Females spent 366, 270, and 154 mins/day engaging in light physical activity at ages 11, 15, and 24 years respectively. cfPWV was significantly higher among males than females at ages 17 and 24 years. cIMT was higher in males than females at 17 years but not at age 24 years. In a fully adjusted model, the highest tertile of light physical activity from ages 11 – 24 years was cumulatively associated with progressively decreased changes in cfPWV (effect estimate -0.024m/s [CI -0.028 – -0.017] p&amp;lt;0.001) from ages 17 – 24 years in the total cohort, males (-0.022m/s [CI -0.044 – -0.010] p&amp;lt;0.001), and females (-0.027m/s [CI -0.044 – -0.010] p=0.002). There was no statistically significant association between cumulative light physical activity and cIMT in the total cohort, males, and females. Conclusion Persistent highest tertile of light physical activity from childhood through young adulthood was associated with decreased arterial stiffness progression.

Association of accelerometer-measured sedentary time, light intensity physical activity levels with cardiometabolic disease risk in Indian office workers: Insights from the SMART-STEP study

Background and aimsSedentary time (ST) is found to be an independent risk for cardiometabolic disease (CMD). While moderate to vigorous physical activity has demonstrated clear benefits in reducing the risk of CMD, only a fraction of the world's population meets the recommended levels. The benefits of easily attainable light-intensity physical activity (LIPA) on CMD risk factors are seldom explored. Our study aimed to explore the association of accelerometer-measured ST and LIPA with CMD risk among Indian office workers. MethodsST and LIPA were recorded using a hip-worn accelerometer (Actigraph) for seven consecutive days, while CMD risk factors were evaluated in 130 insufficiently active office workers. The association of accelerometer-measured ST and LIPA with CMD risk factors were examined using multivariate regression. ResultsHigher ST were positively associated with high body mass index (β = 0.330, p < 0.001) and body fat percentage (β = 0.422, p < 0.001), while LIPA exhibited an inverse relationship with the above variables. Additionally, higher LIPA was associated to low fasting blood sugar levels (FBS) (β = −0.308, p = 0.023). Similarly, high ST was associated with low heart rate variability (HRV) (β = −0.407, p = 0.024) while high LIPA was associated with high HRV (β = 0.379, p = 0.003). However, the associations remain insignificant for majority of other CMD risk factors. ConclusionElevated ST is consistently linked to higher body mass, FBS and lower HRV (an indicator of autonomic stability). LIPA is associated with lower risk of above variables. Still, the association of ST and LIPA with other CMD risk factors remain uncertain. Longitudinal studies with larger samples of Indian office workers is needed to validate the present study findings.

Replacing of sedentary behavior with physical activity and the risk of mortality in people with prediabetes and diabetes: a prospective cohort study

BackgroundSedentary behavior is prevalent among people with diabetes and is associated with unfavorable cardiometabolic health. However, there is limited evidence regarding the impact of replacing sedentary time (ST) with physical activity on mortality in people with prediabetes and diabetes. We prospectively examined the association between accelerometer-measured ST and mortality among people with prediabetes and diabetes after adjusting for demographic characteristics, lifestyle factors, and moderate- to vigorous-intensity PA (MVPA). We further determined the effect of replacing ST with equal time of different types of physical activities on all-cause mortality.MethodsWe included 1242 adults with prediabetes and 1037 with diabetes from the National Health and Nutrition Examination Survey. Restricted cubic splines were fitted to determine the dose–response association between ST and overall mortality. Isotemporal substitution modeling was used to explore the hazard ratio (HR) effects of ST replacement.ResultsDuring a median follow-up of 14.1 years, 424 adults with prediabetes and 493 with diabetes died. Compared with the lowest tertile of ST, the multivariable-adjusted HRs for all-cause mortality in the highest tertile were 1.76 (95% confidence interval [CI] 1.19, 2.60) for participants with prediabetes and 1.76 (1.17, 2.65) for those with diabetes. Additionally, a linear association between ST and all-cause mortality was observed in adults with prediabetes and diabetes, with HRs for each 60 min/day increment in ST of 1.19 (1.10, 1.30) and 1.25 (1.12, 1.40), respectively. Isotemporal substitution results indicated that individuals with prediabetes whose ST was replaced by 30 min of light-intensity physical activity (LPA) and MVPA had 9% and 40% lower all-cause mortality, respectively. In people with diabetes, replacing sedentary behavior with an equivalent time of LPA and MVPA was also associated with mortality risk reduction (HR 0.89; 95% CI 0.84, 0.95 for LPA; HR 0.73; 95% CI 0.49, 1.11 for MVPA).ConclusionsHigher ST was associated in a dose–response manner with an increased risk of premature mortality among adults with prediabetes and diabetes. Statistically replacing ST with LPA was potentially beneficial for health in this high-risk population.

Longitudinal associations of objectively measured physical activity and sedentary time with leg muscle strength, balance and falls in middle-aged women

ABSTRACT We examined the longitudinal associations of accelerometer-measured physical activity and sedentary time with leg muscle strength (LMS), balance, and falls in middle-aged women. This was a 5-year cohort study among 308 women aged 36–56 years. We used linear mixed-effects models to examine associations of baseline and change in accelerometer-measured sedentary time, light physical activity (LPA) and moderate-to-vigorous physical activity (MVPA) with baseline and 5-year change in LMS and balance (timed up and go test [TUG], functional reach test [FRT], lateral reach test [LRT], and step test [ST]), and negative binomial/Poisson and log-binomial regression as appropriate to assess associations with falls after 5-year follow-up. Greater baseline MVPA was associated with better baseline LMS (β = 4.65 kg/SD, 95% CI: 1.37, 7.93) and TUG (β = −0.09 s/SD, 95% CI: –0.18, –0.01) but not with change in them over 5 years. Baseline MVPA was not associated with FRT at baseline but associated with a greater decrease in FRT (β = −0.87 cm/SD, 95% CI: –1.57, –0.17). Increased MVPA over 5 years was associated with less deterioration in FRT (β = 0.88 cm/SD, 95% CI: 0.14, 1.61). Increased sedentary time over 5 years was associated with a larger decrease in FRT (β = −0.82 cm/SD, 95% CI: –1.58, –0.07). Higher baseline LPA was associated with higher falls risk (IRR = 1.27, 95% CI: 1.02, 1.57). Higher baseline MVPA may benefit LMS and balance, while increasing MVPA in the medium term has little effect on change in these outcomes in mid-life. Detrimental association of LPA with falls may be due to greater exposures to environmental hazards. Highlights Our study for the first time examined the longitudinal associations of objectively measured physical activity and sedentary time with leg muscle strength, balance and falls in middle-aged women. Higher baseline moderate-to-vigorous physical activity (MVPA) may be beneficial for muscle strength and balance at baseline but increasing MVPA in the medium term has little effect on change in LMS or balance outcomes in middle-aged women. Higher baseline light physical activity (LPA) was associated with an increased risk of falls. The detrimental association of LPA with falls may be due to a greater exposure to environmental hazards in midlife, which needs to be clarified in future research.

Adolescent sedentary behavior and body composition in early adulthood: results from a cohort study.

This study investigates the cross-sectional and prospective associations between accelerometer-measured sedentary behavior and body composition from adolescence to early adulthood. Data from the Santiago Longitudinal Study were analyzed (n = 212). Sedentary time was measured at age 16 years, and body composition (body mass index [BMI], waist circumference, waist-to-height ratio [WHtR], fat mass percentage, and lean mass percentage) was examined at both age 16 and 23 years. Adjusted linear regression models estimated associations between sedentary time, sedentary bout duration, and body composition, overall and by sex. In all analyses, mean sedentary bout duration was not associated with body composition. In cross-sectional analyses, more sedentary time during adolescence was significantly associated with lower BMI, waist circumference, WHtR, fat mass percentage, and higher lean mass percentage (p < 0.05). One standard deviation increase in daily sedentary time was prospectively associated with lower body mass index (β = -1.22 kg/m2, 95% CI: -2.02, -0.42), waist circumference (β = -2.39 cm, 95% CI: -4.03, -0.75), and WHtR (β = -0.014, 95% CI: -0.024, -0.004). Sedentary time at 16 years was not associated with changes in body composition from 16 to 23 years. Sedentary behavior in adolescence is not adversely associated with body composition profiles in early adulthood. Little is known about the effect of device-measured sedentary behavior on body composition during the transition from adolescence to early adulthood. Among participants in the Santiago Longitudinal Study, more accelerometer-measured sedentary time during adolescence was associated with lower BMI, waist circumference, and waist-to-height ratio in early adulthood though point estimates were generally small in magnitude. Sedentary behavior in adolescence was not detrimentally associated with healthy body composition profiles in early adulthood. Public health interventions aimed at reducing obesity rates could consider other behaviors, such as physical activity and healthy diet, instead of sitting time.

The Joint Associations of Physical Activity and Sedentary Behaviors on Adiposity during Adolescence: The 1993 Pelotas (Brazil) Cohort Study.

A prior study conducted in high-income countries demonstrated that specific sedentary behavior, such as TV viewing, is prospectively associated with adiposity in both active and inactive adolescents. The aim of this study was to examine the joint associations of sedentary behaviors and moderate- and vigorous-intensity physical activity (MVPA) with adiposity among Brazilian adolescents. This prospective cohort study included 377 participants of the 1993 Pelotas (Brazil) Study who completed an accelerometry assessment at age 13 years and a dual-energy X-ray absorptiometry (DXA) assessment at age 18 years. Accelerometer-measured MVPA was dichotomized into high (≥60 min/day) and low (<60 min/day). Accelerometer-measured sedentary time (SED) was dichotomized into low (<49 min/h) and high (≥49 min/h) based on the median. Self-reported TV viewing time was also dichotomized into low (<3 h/day) and high (≥3 h/day) based on the median. We combined the two MVPA groups (high and low) and two SED groups (low and high) to form the four MVPA&SED groups: high&low, high&high, low&low, and low&high. We also created four MVPA&TV groups in the same manner. Fat mass index (FMI; kg/m2) was calculated using DXA-derived fat mass. Multivariable linear regression analyses compared FMI at 18 years among the four MVPA&SED groups and among the four MVPA&TV groups, adjusting for socioeconomic status, energy intake, and baseline adiposity. The analysis results showed that SED or TV viewing time was not prospectively associated with adiposity in both active and inactive Brazilian adolescents. This study suggests that the association between specific sedentary behaviors, such as TV viewing, and adiposity may differ across societal settings-in this case, high-income vs. middle-income countries.

PHYSICAL ACTIVITY AND SEDENTARY TIME ASSOCIATIONS WITH NON-FRACTURE FALL INJURY (NFFI) AND FRACTURE

Abstract Understanding fall injury risk factors and circumstances may lead to better prevention. However, many fall injury studies focus on fractures from hospitalizations or emergency events, rather than non-fracture fall injuries (NFFI), which comprise &amp;gt;50% of fall injuries in older adults. We hypothesized that risk factors were differently associated with NFFI vs. fracture fall injuries in a community-based cohort of ambulatory women with fall injuries in the Objective Physical Activity and Cardiovascular Disease Health in Older Women (OPACH) ancillary of the Women’s Health Initiative Long Life Study. Women with daily fall calendars over 1-year follow-up completed telephone interviews regarding fall injury circumstances (Nf662; mean 79.6 + 6.7 years; 73.3% White). Risk factors and fall circumstances were assessed with first reported fall injury (NFFI vs. fracture) using univariate and multivariate logistic regression. Participants with NFFI vs. fracture were more likely to be non-white, less likely to seek clinical treatment or need help up from fall (all p &amp;lt; 0.05). Adjusting for age, race, and BMI, NFFI vs. fracture were more likely to report &amp;gt;=6 hours sitting (OR=1.72, 95% CI=1.07–2.73) and less likely to report weekly moderate exercise (OR=0.61, 95% CI=0.38–0.96), though total accelerometer-measured sedentary time and physical activity (PA) were not significant. Self-reported PA level at the time of fall (OR=1.31, 95% CI=0.82–2.09) and walking outside for &amp;gt;10 minutes &amp;gt;= 1/week (OR=1.24, 95% CI=0.77–1.98) were not different for NFFI vs. fractures. Older women with NFFI vs. fracture had more sedentary time and less moderate exercise, which may have implications for fall injury severity.

Feasibility of a theory-based intervention to reduce sedentary behaviour among contact centre staff: the SUH stepped-wedge cluster RCT

Background Sedentary behaviour is linked to increased risk of type 2 diabetes, cardiovascular disease, musculoskeletal issues and poor mental well-being. Contact (call) centres are associated with higher levels of sedentary behaviour than other office-based workplaces. Stand Up for Health is an adaptive intervention designed to reduce sedentary behaviour in contact centres. Objectives The objectives were to test the acceptability and feasibility of implementing the intervention; to assess the feasibility of the study design and methods; to scope the feasibility of a future health economic evaluation; and to consider the impact of COVID-19 on the intervention. All sites received no intervention for between 3 and 12 months after the start of the study, as a waiting list control. Design This was a cluster-randomised stepped-wedge feasibility design. Setting The trial was set in 11 contact centres across the UK. Participants Eleven contact centres and staff. Intervention Stand Up for Health involved two workshops with staff in which staff developed activities for their context and culture. Activities ranged from using standing desks to individual goal-setting, group walks and changes to workplace policies and procedures. Main outcome measures The primary outcome was accelerometer-measured sedentary time. The secondary outcomes were subjectively measured sedentary time, overall sedentary behaviour, physical activity, productivity, mental well-being and musculoskeletal health. Results Stand Up for Health was implemented in 7 out of 11 centres and was acceptable, feasible and sustainable (objective 1). The COVID-19 pandemic affected the delivery of the intervention, involvement of contact centres, data collection and analysis. Organisational factors were deemed most important to the success of Stand Up for Health but also the most challenging to change. There were also difficulties with the stepped-wedge design, specifically maintaining contact centre interest (objective 2). Feasible methods for estimating cost-efficiency from an NHS and a Personal Social Services perspective were identified, assuming that alternative feasible effectiveness methodology can be applied. Detailed activity-based costing of direct intervention costs was achieved and, therefore, deemed feasible (objective 3). There was significantly more sedentary time spent in the workplace by the centres that received the intervention than those that did not (mean difference 84.06 minutes, 95% confidence interval 4.07 to 164.1 minutes). The other objective outcomes also tended to favour the control group. Limitations There were significant issues with the stepped-wedge design, including difficulties in maintaining centre interest and scheduling data collection. Collection of accelerometer data was not feasible during the pandemic. Conclusions Stand Up for Health is an adaptive, feasible and sustainable intervention. However, the stepped-wedge study design was not feasible. The effectiveness of Stand Up for Health was not demonstrated and clinically important reductions in sedentary behaviour may not be seen in a larger study. However, it may still be worthwhile conducting an effectiveness study of Stand Up for Health incorporating activities more relevant to hybrid workplaces. Future work Future work could include developing hybrid (office and/or home working) activities for Stand Up for Health; undertaking a larger effectiveness study and follow-up economic analysis (subject to its success); and exploring organisational features of contact centres that affect the implementation of interventions such as Stand Up for Health. Trial registration This trial is registered as ISRCTN11580369. Funding This project was funded by the National Institute for Health and Care Research (NIHR) Public Health Research programme and will be published in full in Public Health Research; Vol. 10, No. 13. See the NIHR Journals Library website for further project information.

How sedentary are Canadian adults? It depends on the measure.

The new Canadian 24-Hour Movement Guidelines for Adults aged 18-64 years and Adults aged 65 years and older recommend that adults limit daily sedentary time to eight hours or less, including three hours or less of recreational screen time. The eight-hour recommendation was centred between the evidence from research using self-reported sitting time (threshold: seven hours or less per day) and accelerometer-measured sedentary time (threshold: nine hours or less per day). The purpose of this study is to compare the percentages of Canadians meeting three different sedentary thresholds (three hours or less per day of screen time, seven hours or less per day of self-reported sitting time and nine hours or less per day of accelerometer-measured sedentary time). This analysis is based on 2,511 adults (aged 18 to 79 years) from Cycle 3 of the Canadian Health Measures Survey, in 2012 and 2013. Screen time and sitting time were assessed via self-report, and average daily sedentary time was assessed using a hip-worn Actical accelerometer. Adults self-reported an average daily screen time of 3.2 hours (95% confidence interval [CI]: 3.0 to 3.5) and an average daily sitting time of 5.7 hours (95% CI: 5.4 to 6.0). According to accelerometry data, adults accumulated an average of 9.8 hours per day (95% CI: 9.7 to 9.9) of sedentary time. Adherence varied, with 57.7% meeting the self-reported recreational screen time threshold of three hours or less per day, 71.7% meeting the self-reported sitting time threshold of seven hours or less per day and 26.5% meeting the accelerometer-measured sedentary time threshold of nine hours or less per day. The percentage of Canadian adults meeting the three different sedentary behaviour thresholds varied widely. The findings in this article highlight the difference in sedentary time between what Canadians report versus what is measured by an accelerometer.

Cardiovascular disease risk and all-cause mortality associated with accelerometer-measured physical activity and sedentary time ‒ a prospective population-based study in older adults

BackgroundLow levels of physical activity (PA) and high sedentary time (ST) are common in older adults and lack of PA is a risk factor for cardiovascular disease (CVD). Knowledge about associations with accelerometer-measured PA, ST and CVD risk in older adults is insufficient. This study examines the associations of accelerometer-measured PA and ST with cardiovascular risk measured using the Framingham risk score (FRS) and all-cause mortality in older adults.MethodsA population-based sample of 660 (277 men, 383 women) older people (mean age 68.9) participated in the Oulu45 cohort study from 2013‒2015. PA and ST were measured with wrist-worn accelerometers at baseline for two weeks. Ten-year CVD risk (%) was estimated with FRS. The data for all-cause mortality were identified from the Digital and Population Data Services Agency, Finland after an average of 6.2 years follow-up. The associations between moderate to vigorous physical activity (MVPA), light physical activity (LPA), ST and FRS were analyzed using the multivariable linear regression analysis. Associations between LPA, ST and mortality were analyzed using the Cox proportional-hazard regression models.ResultsEach 10 min increase in MVPA (β = -0.779, 95% CI -1.186 to -0.371, p < 0.001) and LPA (β = -0.293, 95% CI -0.448 to -0.138, p < 0.001) was negatively associated with FRS while a 10 min increase in ST (β = 0.290, 95% CI 0.158 to 0.421, p < 0.001) was positively associated with FRS. After adjustment for waist circumference, only ST was significantly associated with FRS. Each 10 min increase in LPA was associated with 6.5% lower all-cause mortality risk (HR = 0.935, 95% CI 0.884 to 0.990, p = 0.020) and each 10 min increase in ST with 5.6% increased mortality risk (HR = 1.056, 95% CI 1.007 to 1.108, p = 0.025).ConclusionA higher amount of daily physical activity, at any intensity level, and avoidance of sedentary time are associated with reduced cardiovascular disease risk in older people. Higher time spent in light physical activity and lower sedentary time are associated with lower all-cause mortality.

Physical activity, screen time and the incidence of neck and shoulder pain in school-aged children

This study investigated the associations of accelerometer-measured physical activity, sedentary time and screen time with the incidence of neck and shoulder pain in school-aged children over a two-year follow-up. Children (aged 10–15) were measured at baseline 2013 (T0) (n = 970) and at follow-ups 2014 (T1) and 2015 (T2). Neck and shoulder pain frequency and screen time were determined with a web-based questionnaire. Daytime moderate to vigorous physical activity and sedentary time were measured with an accelerometer. Logistic regression was applied, and the results were adjusted for age, gender, body mass index and bedtime. Accelerometer-measured physical activity or sedentary time at baseline were not associated with the incidence of neck and shoulder pain at the two-year follow-up. Associations of neck and shoulder pain incidence with overall screen time (p = 0.020), and especially with passive gaming time (p = 0.036) and social media time (p = 0.023) were found at the first but not the second follow-up. The neck and shoulder pain incidence associated with overall screen time, passive gaming time and social media time at the first follow-up. The importance of limiting screen time, should be explored in order to find new approaches in preventing neck and shoulder pain in school-aged children.