Measured Body Mass Research Articles

Rapid Increase of Female but not Male Obesity: Analysis of the 2023 Vanuatu Health Transition Project Survey on Aneityum

Globally, obesity rates are continuing to increase and countries in the midst of modernization are most vulnerable. Developing nations are undergoing a health transition alongside rapid economic modernization. The nation of Vanuatu, like other Pacific island countries, is experiencing such a transition marked by decreased cases of infectious disease and increased incidence of chronic and non-communicable diseases. Aneityum is a small and sparsely populated island in Vanuatu and is behind more developed islands in its transition. This present study is the latest in a multi-year project examining health in Vanuatu as it undergoes a health transition with an increased prevalence of chronic disease, namely cardiovascular diseases and type 2 diabetes. In this study, we sought to continue tracking the population health on Aneityum, to analyze health differences between men and women, and to compare findings to previous data in Vanuatu. In July and August of 2023, adult males [n=41] and females [n=62] were surveyed and had their anthropometric measurements taken on Aneityum in Vanuatu. Mean anthropometric measurements (body mass index, body fat percentage, waist circumference) continued to be significantly greater among women than men (P-value < 0.05). Women exhibited higher rates of obesity in all metrics than in previous studies while men remained relatively unchanged. While men still have lower obesity rates compared to those from Efate in 2011, the women of Aneityum have reached similar levels as their counterparts from a decade ago. There is debate whether Ni-Vanuatu populations are more accurately measured by WHO or Asian-Pacific BMI cutoffs. When Asian-Pacific BMI guidelines are applied, male obesity rate rises 4.87% and the female obesity rate rises 17.74%, indicating drastically worse population health than previously thought. Potential explanations for the disparity in obesity rates between males and females include sex-associated fat distribution patterns, social inequality, and cultural habits. This paper provides valuable insights into the state of Vanuatu's health in its transitional period and a greater understanding of the interplay between sex and health.

New role of fat-free mass in cancer risk linked with genetic predisposition

Cancer risk is associated with the widely debated measure body mass index (BMI). Fat mass and fat-free mass measurements from bioelectrical impedance may further clarify this association. The UK Biobank is a rare resource in which bioelectrical impedance and BMI data was collected on ~ 500,000 individuals. Using this dataset, a comprehensive analysis using regression, principal component and genome-wide genetic association, provided multiple levels of evidence that increasing whole body fat (WBFM) and fat-free mass (WBFFM) are both associated with increased post-menopausal breast cancer risk, and colorectal cancer risk in men. WBFM was inversely associated with prostate cancer. We also identified rs615029[T] and rs1485995[G] as associated in independent analyses with both PMBC (p = 1.56E–17 and 1.78E–11) and WBFFM (p = 2.88E–08 and 8.24E–12), highlighting splice variants of the intriguing long non-coding RNA CUPID1 (LINC01488) as a potential link between PMBC risk and fat-free mass.

Positive Outliers: A Mixed Methods Study of Resiliency to Childhood Obesity in High-Risk Neighborhoods

ObjectiveDespite the high prevalence of obesity and the clustering of risk by neighborhood, few studies have examined characteristics which promote healthy child weight in neighborhoods with high obesity risk. We aimed to identify protective factors for children living in neighborhoods with high obesity risk. MethodsWe identified neighborhoods with high obesity risk using geolocated electronic health record data with measured body mass index (BMI) from well-child visits (2012–2017). We then recruited caregivers with children aged 5 to 13 years who lived in census tracts with mean child BMI percentile ≥72 (February 2020–August 2021). We used sequential mixed methods (quantitative surveys, qualitative interviews) to compare individual, interpersonal, and perceived neighborhood factors among families with children at a healthy weight (positive outliers [PO]) versus families with ≥1 child with overweight or obesity (controls). Regression models and comparative qualitative analysis were used to identify protective characteristics. ResultsSeventy-three caregivers participated in the quantitative phase (41% PO; 34% preferred Spanish) and twenty in the qualitative phase (50% PO; 50% preferred Spanish). The frequency of healthy caregiver behaviors was associated with being a PO (Family Health Behavior Scale Parent Score adjusted β 3.67; 95% CI 0.52–6.81 and qualitative data). Protective factors also included caregivers’ ability to minimize the negative health influences of family members and adhere to family routines. ConclusionsThere were few differences between PO and control families. Support for caregiver healthy habits and adherence to healthy family routines emerged as opportunities for childhood obesity prevention in neighborhoods with high obesity risk.

Abstract MP76: Street View Greenspace Exposures and Cardiovascular Health Among Children - Evidence From Project Viva

Introduction: Research on greenspace and cardiovascular health (CVH) in children is limited, and most previous studies rely on coarse satellite-based measurements of greenspace, which do not capture exposure as individuals experience it. Street View imagery (SVI) enables measurement of greenspace from a ground-level perspective and captures specific elements of greenspace that may be most relevant to health. This study aimed to examine associations of SVI-based greenspace with CVH in children in Project Viva, an eastern Massachusetts-based cohort. Methods: Using data from 1,163 children, we applied deep learning segmentation algorithms to SVI from 2007-2010 to derive metrics of greenspace (%of trees, or grass) within a 500m radius of participants’ residential addresses obtained during mid-childhood (mean age 7.9y). At mid-childhood and early adolescence (mean age 13.2y), we calculated CVH scores (range 0-100 units; higher scores represent better CVH) using the American Heart Association’s Life’s Essential 8 algorithm, based on 4 biomedical measures (body mass index, blood lipids, blood glucose, and blood pressure) and 4 behavioral measures (heart healthy levels of diet, physical activity, avoidance of nicotine, and sleep). Using linear regression, we examined associations of mid-childhood SVI-based greenspace metrics with mid-childhood (cross-sectional) and early adolescence (longitudinal) CVH scores, adjusting for child’s sex, race and ethnicity, and age at outcome, as well as an index score of socioeconomic status comprising individual and neighborhood metrics. Results: Among the 1163 participants, 65% were non-Hispanic White and 49% were female. The mean (SD) LE8 score was 83.3 (8.0) in mid-childhood and 81.7 (8.9) in early adolescence. In the unadjusted models, a higher %trees and grass per SD, as measured by SVI within children’s residence in mid-childhood, was associated with a higher overall CVH score (β 1.63 [95%CI: 0.93, 2.33] for trees; β 1.10 [95%CI: 0.36, 1.83] for grass). In longitudinal analyses, the results were similar (β 1.69 [95%CI: 0.87, 2.52] for trees; β 0.82 [95%CI: -0.01, 1.64] for grass). In fully-adjusted analyses, the cross-sectional and longitudinal results for %trees and grass were attenuated and not statistically significant. However, when CVH scores were disaggregated by behavioral and biomedical sub-scores, %trees was positively associated with behavioral sub-scores in cross-sectional fully-adjusted analyses at mid-childhood (β 0.89 [95%CI: 0.32, 1.46]). Conclusion: Among participants in Project Viva, SVI-based metrics of greenspace exposure in mid-childhood were cross-sectionally associated with behavioral factors promoting higher CVH. Greenspace may hold promise for improving children’s CVH through the behavioral pathway and should be considered in future health-promotion efforts.

Exertional breathlessness related to medical conditions in middle-aged people: the population-based SCAPIS study of more than 25,000 men and women

BackgroundBreathlessness is common in the population and can be related to a range of medical conditions. We aimed to evaluate the burden of breathlessness related to different medical conditions in a middle-aged population.MethodsCross-sectional analysis of the population-based Swedish CArdioPulmonary bioImage Study of adults aged 50–64 years. Breathlessness (modified Medical Research Council [mMRC] ≥ 2) was evaluated in relation to self-reported symptoms, stress, depression; physician-diagnosed conditions; measured body mass index (BMI), spirometry, venous haemoglobin concentration, coronary artery calcification and stenosis [computer tomography (CT) angiography], and pulmonary emphysema (high-resolution CT). For each condition, the prevalence and breathlessness population attributable fraction (PAF) were calculated, overall and by sex, smoking history, and presence/absence of self-reported cardiorespiratory disease.ResultsWe included 25,948 people aged 57.5 ± [SD] 4.4; 51% women; 37% former and 12% current smokers; 43% overweight (BMI 25.0–29.9), 21% obese (BMI ≥ 30); 25% with respiratory disease, 14% depression, 9% cardiac disease, and 3% anemia. Breathlessness was present in 3.7%. Medical conditions most strongly related to the breathlessness prevalence were (PAF 95%CI): overweight and obesity (59.6–66.0%), stress (31.6–76.8%), respiratory disease (20.1–37.1%), depression (17.1–26.6%), cardiac disease (6.3–12.7%), anemia (0.8–3.3%), and peripheral arterial disease (0.3–0.8%). Stress was the main factor in women and current smokers.ConclusionBreathlessness mainly relates to overweight/obesity and stress and to a lesser extent to comorbidities like respiratory, depressive, and cardiac disorders among middle-aged people in a high-income setting—supporting the importance of lifestyle interventions to reduce the burden of breathlessness in the population.

Silhouette showcards confirm altered obesity-associated body image perception in international cohort study of African-origin populations

ObjectivesGiven the increasing prevalence of obesity and need for effective interventions, there is a growing interest in understanding how an individual’s body image can inform obesity prevention and management. This...

Profile of malnourished COPD patients: A comparative study

Introduction: Malnutrition is frequently associated with chronic obstructive pulmonary disease (COPD) especially in severe stages. It is correlated with a poor prognosis. The aim of this study was to determine malnutrition prevalence in COPD patients and to compare the profile of malnourished COPD versus not-malnourished COPD patients. Patients and methods: Stable COPD patients benefited from nutritional evaluation by measuring body mass index (BMI). Subsequently, a comparative study was used to compare disease severity, number of acute exacerbations, modified Medical Research Council (mMRC) dyspnea scale score and exercise capacity by the 6 min walk test (6MWT) between malnourished and not malnourished COPD patients. Results: 175 COPD patients were recruited (9F; 166M) aged between 40 and 86 with an average age of 67.95 years. The mean smoke load of the patients was 35(20) packs/year, FEV1: 52(21) % pred, m MRC dyspnea scale: 2 (1). 41.14% of COPD patients were malnourished (BMI < 20 Kg/m2). Two groups were individualized. · Group A: COPD with BMI < 20 Kg/m2:72 patients, (4F; 68M), age: 67(9) years, FEV1: 48.5(21.44) % pred. · Group B: COPD with BMI≥ 20 Kg/m2: 103 patients, (5F, 98M), age: 68(9) years, FEV1: 55.25(21.42) % pred. Using the Global Initiative for Chronic Obstructive Lung Disease (GOLD) criteria, the functional stages found in group A patients were GOLD I: 12%, GOLD II: 23%, GOLD III: 42%, GOLD IV: 23%. While for group B were GOLD I:25% GOLD II%:35%, GOLD III:28%, GOLD IV:12%. 72% of group A patients have an m MRC ≥ 2 Vs 63% of group B. 77.8% of group A patients have a history of hospitalization for at least one acute exacerbation in the last 12-month vs 63.1% of Group B patients. The 6-min walk average distance (6MWD) was 423.58 m in Group A vs 438.33 m in Group B. Conclusion: Nutritional assessment and appropriate management of undernutrition should be integrated into the treatment of COPD patients.

A Comparative Study of Food Intake and Adipose Tissue Distribution in Saudi Women with Polycystic Ovarian Syndrome

Polycystic ovary syndrome (PCOS) is a frequent disorder that affects reproductive-aged women and has reproductive, metabolic, and psychosocial effects. This research was intended to investigate the comparison between food intake and adipose tissue distribution in Saudi women suffering from PCOS and a control group. To determine the sociodemographic variables, a case–control study was performed with patients from King Fahad Medical City’s Reproductive Endocrine and Infertility Medicine Department (REIMD). The case–control study comprised 42 PCOS patients (PCOS-Ps) and 63 as a control group, all aged 20–45 years. Three-day records were collected from participants to estimate the nutrient intake of cases and controls. A body composition analyzer was used to measure body mass index (BMI), body fat (BF), and visceral fat (VF). Biochemical measurements were taken to determine the lipid profile, total testosterone, and serum vitamin D-25-OH. The women’s frequency distribution based on sociodemographic characteristics revealed significant differences within and between the groups. The variations in dietary intake between the PCOS-P and control groups were primarily in terms of total calories, carbohydrates, niacin, and folate, all of which were significantly higher in the PCOS-P group. Dietary fiber, unsaturated fat, vitamin A, vitamin B12, calcium, phosphorus, and selenium, on the other hand, were significantly higher in the control group. A majority of both groups had significantly higher BMI (overweight or obese) and higher BF, but normal VF. According to the findings, testosterone levels in PCOS-Ps were significantly higher than in the control group, but vitamin D-25-OH and high-density-lipoprotein cholesterol (HDL-C) were significantly lower. Age, monthly income, cholesterol, low-density-lipoprotein cholesterol (LDL-C), and testosterone were the fundamental causes impacting women’s anthropometric indices. In conclusion, although both groups were overweight or obese, and differences in calorie and nutrient intake, HDL-C, testosterone, and vitamin D-25-OH levels were observed. The study advises such population groups to limit their consumption of foods high in calories.

Exploring the Role of Adult Wrist Circumference as a Potential Indicator of Obesity.

To explore the correlation of wrist circumference (WrC) with various obesity indices and to determine gender-specific optimal cut-off points of WrC for obesity. Cross-sectional study. Place and Duration of the Study: Dow University of Health Sciences, Karachi, Pakistan, from December 2021 to December 2022. Two hundred and eighty residents of Karachi, aged 30-60 years, participated in this research. Established methods were used to measure body mass index (BMI), waist circumference, hip circumference, neck circumference, WrC, visceral fat level, waist-hip ratio, abdominal volume index, and body roundness index. Correlation of WrC with all obesity markers was done and scatterplots were obtained. Receiver Operating Characteristic curves were plotted to find the gender-specific cut-off value of WrC. Of the total 280 subjects, 191 (68%) were females and 89 (32%) were males. The overall mean age was 42.04 ± 9.12 years (range: 28-65 years). The mean WrC in males and females were 16.32 ± 1.01 cm and 14.82 ± 1.03 cm, respectively. The WrC correlated best with neck circumference in males (r = 0.758; p<0.001) and BMI in females (r=0.615; p<0.001). The scatterplots obtained showed positive linear relationships between WrC and anthropometric variables. The cut-off values of WrC for adult males and females when compared to waist circumference were 15.45 cm and 13.95 cm, respectively. Measurement of the WrC can be a helpful indicator to identify excess weight in the general population. Its ease of measurement makes it applicable in both routine clinical practice and extensive epidemiological research. Wrist circumference, BMI, Waist circumference, Obesity.

Association of the rs236918 variant of PCSK7 with the prevalence of the metabolic syndrome and its components in population from Ahvaz cohort study: A case-control study in Iran

Objectives: The proprotein convertase subtilisin/kexin type 7 (PCSK7) enzyme is encoded by the PCSK7 gene and is involved in the processing and activation of latent precursor proteins. Previous studies have reported that some PCSK7 variants are associated with markers of body iron stores and lipid profiles, as well as obesity and insulin resistance. The aim of this study was to investigate the association of the rs236918 variant of PCSK7 with metabolic syndrome (MetS) and its related components.&#x0D; Methods: In this cross-sectional study, 325 participants in the age group of 25 to 86 years were examined. Standard protocols were employed to measure body mass index, blood pressure, fasting blood glucose, total cholesterol (TC), high-density lipoprotein cholesterol (HDL-C), and triglycerides (TG). Individuals with metabolic syndrome (MetS) were identified in accordance with the guidelines set by the National Cholesterol Education Program. Genotype was determined using the PCR-RFLP method.&#x0D; Results: The findings revealed that there was no association between the rs236918 variant and increased risk of MetS or its components and also plasma lipid profile.&#x0D; Conclusion: Overall, the findings exhibit no significant association between the PCSK7 rs236918 polymorphism and MetS in this population. Although these results may be due to sample size and power issues, the role of lifestyle factors and other genes in the development of MetS appears to be more important in this population. Therefore, further research is required to validate these results.

Metabolism, population growth, and the fast‐slow life history continuum of marine fishes

AbstractThe maximum intrinsic rate of population increase (rmax) represents a population's maximum capacity to replace itself and is central to fisheries management and conservation. Species with lower rmax typically have slower life histories compared to species with faster life histories and higher rmax. Here, we posit that metabolic rate is related to the fast–slow life history continuum and the connection may be stronger for maximum metabolic rate and aerobic scope compared to resting metabolic rate. Specifically, we ask whether variation in rmax or any of its component life‐history traits – age‐at‐maturity, maximum age, and annual reproductive output – explain variation in resting and maximum metabolic rates and aerobic scope across 84 shark and teleost species, while accounting for the effects of measurement temperature, measurement body mass, ecological lifestyle, and evolutionary history. Overall, we find a strong connection between metabolic rate and the fast‐slow life history continuum, such that species with faster population growth (higher rmax) generally have higher maximum metabolic rates and broader aerobic scopes. Specifically, rmax is more important in explaining variation in maximum metabolic rate and aerobic scope compared to resting metabolic rate, which is best explained by age‐at‐maturity (out of the life history traits examined). In conclusion, teleosts and sharks share a common fast–slow physiology/life history continuum, with teleosts generally at the faster end and sharks at the slower end, yet with considerable overlap. Our work improves our understanding of the diversity of fish life histories and may ultimately improve our understanding of intrinsic sensitivity to overfishing.

Design and Validation of a Clinical Outcome Measure for Adolescents and Adult Patients with Spinal Muscular Atrophy: SMA Life Study Protocol.

The objective of this study is to develop a clinical tool for the evaluation and follow-up of adolescent and adult patients with 5q spinal muscular atrophy (SMA) and to design its validation. This prospective, non-interventional study will be carried out at five centres in Spain and will include patients aged 16years or older with a confirmed diagnosis of 5q SMA (biallelic mutation of the survival motor neuron 1 [SMN1] gene). A panel of experts made up of neurologists, physiatrists and Spanish patients' association (FundAME), participated in the design of the clinical tool. Physicians will administer the tool at three time points (baseline, 12months and 24months). Additionally, data from other questionnaires and scales will be collected. Once recruitment is achieved, an interim statistical analysis will be performed to assess its psychometric properties by applying Rasch analysis and classical statistical tests. The tool will consist of up to 53 items to assess functional status from a clinical perspective in seven key dimensions (bulbar, respiratory, axial, lower, upper, fatigability and other symptoms), which will be collected together with objective clinical measures (body mass index, forced vital capacity, pinch strength and 6-minute walk test). The validation of this tool will facilitate the clinical evaluation of adult and adolescent patients with SMA and the quantification of their response to new treatments in both clinical practice and research.

Body composition and respiratory outcomes in children: a population-based prospective cohort study

BackgroundBody composition might influence lung function and asthma in children, but its longitudinal relations are unclear. We aimed to identify critical periods for body composition changes during childhood and adolescence...

Association between obesity and fracture risk in Chinese women above 50 years of age: a prospective cohort study.

Fractures present serious health challenges for older adults, including premature mortality and reduced quality of life. Obesity has become significantly prevalent in China. However, the association between obesity and fractures remains unclear. This study aimed to assess the association between obesity and fractures among Chinese women above 50years of age. A prospective cohort study was designed based on the China Health and Nutrition Survey, using data from 1997 to 2015. The average follow-up duration was seven years. Trained investigators measured body mass index (BMI) and waist circumference (WC) at baseline. Obesity was defined according to World Health Organization recommendations. Waist-to-height ratio (W-HtR) was calculated, with 0.5 as the cutoff value. Onset of fractures, self-reported by the participants during the follow-up period, was the primary outcome. Cox hazard regression models were used to assess the association between BMI, WC, W-HtR and subsequent risk of fracture. A sensitivity analysis was conducted by multiple imputation of missing data on the variables at baseline. A total of 2,641 women aged ≥ 50 years were involved in the study. In all the models, no significant association existed between BMI and fracture risk. However, women with WC ≥ 88cm had significantly higher risk of fracture than those with WC < 80cm according to both the unadjusted (HR = 1.744, 95% CI: 1.173-2.591) and adjusted models (HR = 1.796, 95% CI: 1.196-2.695). In addition, W-HtR and fracture risk were positively associated according to both the unadjusted (HR = 1.798, 95% CI: 1.230-2.627) and adjusted models (HR = 1.772, 95% CI: 1.209-2.599). Results of the sensitivity analysis were consistent with those of the above analyses. Abdominal obesity increased the risk of all-cause fractures in Chinese women ≥ 50years old. Intervention strategies and measures to prevent or address abdominal obesity would be helpful to decrease the fracture incidence.

Experimental Study on the Effect of Sprint Interval Training Versus Traditional Exercise Programs Among Young Obese Adults.

The aim and objective of the study is that the prevalence of overweight and obesity have peaked in past decades whichresulting in many adverse effects on health of young adults; hence this study is designed to compare the effectiveness of sprintinterval training and traditional exercise program on body mass index (kg/m2), waist circumference (cm), body weight (kg) andblood lipid profiles in young adult with obesity. According to WHO, Obesity has become a global epidemic in both developed anddeveloping countries, which is considered one of the major risk factors for cardiovascular diseases. The American HeartAssociation has recommended reducing the risk of cardiovascular disease by weight loss, which is essential for the obesepopulation. Sprint Interval Training has improved insulin sensitivity, low-density lipoprotein cholesterol [LDL-C], and bodycomposition. Traditional exercises were also effective in improving cardiovascular and metabolic function and consequent reductionin the prevalence of dyslipidemia, hypertension, and insulin resistance. In this comparative study, 30 subjects aged 20-30 with a BodyMass Index &gt;25 were included based on specific selection criteria and divided into two groups. Group A was trained with sprintinterval training, and Group B was trained with traditional exercise training. Each group, A and B, consisting of 15 subjects, wasrecruited from Dr. M.G.R. Educational and Research Institute, Chennai. This study measured Body Mass Index, Waistcircumference, and body weight before and after the intervention in groups A and B. Comparing Posttest values between Group Aand Group B on Body Weight, Body Mass Index, and waist circumference score showed a highly significant difference in meanvalues at P ≤ 0.001 in Group A than Group B. Hence, this study proved that sprint interval training significantly improved inreducing Body mass index, waist circumference, and body weight in obese young adults.

Inferring condition in wild mammals: body condition indices confer no benefit over measuring body mass across ecological contexts.

Many studies assume that it is beneficial for individuals of a species to be heavier, or have a higher body condition index (BCI), without accounting for the physiological relevance of variation in the composition of different body tissues. We hypothesized that the relationship between BCI and masses of physiologically important tissues (fat and lean) would be conditional on annual patterns of energy acquisition and expenditure. We studied three species with contrasting ecologies in their respective natural ranges: an obligate hibernator (Columbian ground squirrel, Urocitellus columbianus), a facultative hibernator (black-tailed prairie dog, Cynomys ludovicianus), and a food-caching non-hibernator (North American red squirrel, Tamiasciurus hudsonicus). We measured fat and lean mass in adults of both sexes using quantitative magnetic resonance (QMR). We measured body mass and two measures of skeletal structure (zygomatic width and right hind foot length) to develop sex- and species-specific BCIs, and tested the utility of BCI to predict body composition in each species. Body condition indices were more consistently, and more strongly correlated, with lean mass than fat mass. The indices were most positively correlated with fat when fat was expected to be very high (pre-hibernation prairie dogs). In all cases, however, BCI was never better than body mass alone in predicting fat or lean mass. While the accuracy of BCI in estimating fat varied across the natural histories and annual energetic patterns of the species considered, measuring body mass alone was as effective, or superior in capturing sufficient variation in fat and lean in most cases.

The Associations Between Social Media Use with Eating Behavior, Physical Activity, and Nutrition Status among Adolescents in DKI Jakarta

Background: Increased adolescent social media use can lead to lower physical activity. In addition, the growth of marketing of unhealthy foods and drinks is inevitable. In short, excessive social media use may negatively impact nutrition problems, eating behavior, and physical activities. Objectives: This study aimed to determine the relationship between patterns of social media use and nutrition status, eating behavior, and physical activity among adolescents in DKI Jakarta. Methods: The study was cross-sectional and involved 187 students from public high schools in Jakarta. Data was collected using the Food Frequency Questionnaire (FFQ), the International Physical Activity Questionnaire (IPAQ), the use of social media questionnaire, and an anthropometric assessment to measure body mass index for age. The statistical analysis used was the chi-square test. Results: No significant association were found between the frequency and duration of social media use and nutrition status. The type of exposure to social media content does not show a significant relationship with nutrition status, eating behavior, and physical activity. However, there were significant associations between frequency (p=0.022) and duration (p=0.003) of social media use and eating behavior. Likewise, there was a significant relationship between frequency (p=0.021) and duration (p=0.005) of social media use with physical activity. Conclusions: Duration and frequency of social media use are associated with riskier eating patterns and lower adolescent physical activity. Therefore, nutrition education in adolescents should also include topics on social media use.

The Risk Factors Associated with Handgrip Strength and Endurance in Adolescence

Background Handgrip strength and endurance are some of the ways that can be done to examine the muscle quality of adolescents as well as their physical fitness. It is influenced by various internal and external factors, including body mass index, gender, age, and smoking habits. Handgrip strength can be an important parameter for health. Adolescents with lower muscle strength have an increased mortality rate in adulthood. Thus, this study aimed to determine the factors associated with handgrip strength and endurance in adolescence. Methods The study used analytic observational with a cross-sectional approach using consecutive non-random sampling on 58 adolescents between 15-23 years old. The instruments used a scale and microtoise to measure body mass index, and a hand dynamometer to measure handgrip strength and endurance. The data was analyzed by the Chi-square test using the SPSS program with p&lt;0.05. Results Of the 58 respondents consisting of 48.27% men, and 51.72% women, there were 58.62% normal BMI and 70.68% did not smoke. The percentage of respondents who had weak grip strength was lower (44.82%) compared to weak grip endurance (55.17%). There was no significant relationship between gender and handgrip endurance; body mass index and handgrip strength as well as handgrip endurance; cigarette consumption and handgrip strength. Moreover, there was found a significant relationship between gender and handgrip strength (p=0.000) and between cigarette consumption and handgrip endurance (p=0.011). Conclusions Handgrip strength and endurance were more in the weak-medium category. There was no significant relationship between gender and handgrip endurance; body mass index and handgrip strength as well as handgrip endurance; cigarette consumption and handgrip strength. Moreover, there was found a significant relationship between gender and handgrip strength and between cigarette consumption and handgrip endurance.

Over-winter body mass and conceptions of white-tailed deer in central Texas

At lower latitudes ungulate reproduction is often seasonal, but the duration of mating and parturition seasons can be long. To further understand the adaptive significance of synchrony in reproductive events, we examined two hypotheses to link over-winter body mass with lower synchrony of conceptions in a wild population of white-tailed deer ( Odocoileus virginianus (Zimmermann, 1780)) in central Texas. If females maintain over-winter body mass, then the window of time that conception occurs should be relaxed and longer relative to females where over-winter body mass declines. Across 9 years, we measured body mass in 1.5-year-old and older females in November ( n = 170) and in March (118). In March, we also measured forehead–rump lengths in offspring of gravid females and calculated conception dates. Over-winter body mass did not decline but was maintained, on average, across the years of study. Conception dates ranged over 50 days and 52% of conceptions occurred in a 2-week period centered on the median conception date. Relative to northern populations of deer, there was lower synchrony in conception dates. White-tailed deer across the geographic range appear to be flexible in over-winter body mass dynamics that affects duration of reproductive events such as conception.

Association of change in fat and lean mass with incident cardiovascular events for women in midlife and beyond: A prospective study using dual-energy x-ray absorptiometry (DXA).

To determine whether changes in fat and lean mass over time, quantified using dual-energy x-ray absorptiometry (DXA), are related to incident cardiovascular events. Previous studies using surrogate anthropometric methods have had inconsistent findings. Prospective, longitudinal observational study of women aged 40 to 80 randomly selected from the electoral roll and stratified into decades: 40-49, 50-59, 60-69 and 70-79years. Changes in anthropometric measurements (body mass index and waist-to-hip ratio) and DXA-quantified fat mass and lean mass between the first and fifth years of the study. Incident cardiovascular events recorded from the sixth to the 12th year. In total 449 participants (87.9%) were analyzed. A 10% or greater decrease in total fat mass index was associated with a 67% lower likelihood of any cardiovascular event (OR=0.33, 95%CI 0.15-0.71); no association was observed for an increase. A 10% or greater decrease in abdominal fat mass index was associated with a 62% lower likelihood of incident stroke (OR=0.38, 95%CI 0.16-0.91); no association was observed for an increase. A 10% or greater decrease in appendicular lean mass index resulted in increased odds ratio of 2.91 for incident peripheral artery events (OR=2.91, 95%CI 1.18-7.20). Reducing fat mass for women in midlife and beyond may decrease the risk of cardiovascular events. An increase in fat mass may not contribute to additional cardiovascular events. A reduction in limb muscle mass may provide an independent marker for cardiometabolic risk and peripheral artery disease. No independent association was found using anthropometric measurements and incident cardiovascular events.