High-intensity Interval Training Training Research Articles

Moderate-Intensity Constant and High-Intensity Interval Training Confer Differential Metabolic Benefits in Skeletal Muscle, White Adipose Tissue, and Liver of Candidates to Undergo Bariatric Surgery.

Background/Objectives: Bariatric surgery candidates require presurgical physical training, therefore, we compared the metabolic effects of a constant moderate-intensity training program (MICT) vs. a high-intensity interval training (HIIT) in this population. Methods: Seventeen participants performed MICT (n = 9, intensity of 50% of heart rate reserve (HRR) and/or 4-5/10 subjective sensation of effort (SSE)) or HIIT (n = 8, 6 cycles of 2.5 min at 80% of the HRR and/or 7-8/10 of SSE, interspersed by 6 cycles of active rest at 20% of the FCR) for 10 sessions for 4 weeks. After training, tissue samples (skeletal muscle, adipose tissue, and liver) were extracted, and protein levels of adiponectin, GLUT4, PGC1α, phospho-AMPK/AMPK, collagen 1 and TGFβ1 were measured. Results: Participants who performed MICT showed higher protein levels of PGC-1α in skeletal muscle samples (1.1 ± 0.27 vs. 0.7 ± 0.4-fold change, p < 0.05). In the liver samples of the people who performed HIIT, lower protein levels of phospho-AMPK/AMPK (1.0 ± 0.37 vs. 0.52 ± 0.22-fold change), PGC-1α (1.0 ± 0.18 vs. 0.69 ± 0.15-fold change), and collagen 1 (1.0 ± 0.26 vs. 0.59 ± 0.28-fold change) were observed (all p < 0.05). In subcutaneous adipose tissue, higher adiponectin levels were found only after HIIT training (1.1 ± 0.48 vs. 1.9 ± 0.69-fold change, p < 0.05). Conclusions: Our results show that both MICT and HIIT confer metabolic benefits in candidates undergoing bariatric surgery; however, most of these benefits have a program-specific fashion. Future studies should aim to elucidate the mechanisms behind these differences.

Effects of HIIT training and HIIT combined with circuit resistance training on measures of physical fitness, miRNA expression, and metabolic risk factors in overweight/obese middle-aged women

ObjectiveThe purpose of this study was to examine the effects of 10 weeks of high-intensity interval training (HIIT) and HIIT combined with circuit resistance training (HCRT) on selected measures of physical fitness, the expression of miR-9, -15a, -34a, -145, and − 155 as well as metabolic risk factors including lipid profiles and insulin resistance in middle-aged overweight/obese women.MethodsTwenty-seven overweight/obese women aged 35–50 yrs. were randomized to HIIT (n = 14) or HCRT (n = 13) groups. The HIIT group performed running exercises (5 reps x 4 min per session) with active recovery between repetitions for 10 weeks with 5 weekly sessions. The HCRT group performed 10 weeks of HIIT and resistance training with 3 weekly HIIT sessions and 2 weekly HCRT sessions. Anthropometric measures (e.g., body mass), selected components of physical fitness (cardiovascular fitness, muscle strength), levels of miRNAs (miR-9, -15a, -34a, -145, and − 155), lipid profiles (total cholesterol; TC, Triglycerides; TG, low-density lipoprotein cholesterol; LDL-C and high-density lipoprotein cholesterol; HDL-C), and insulin resistance; HOMA-IR index, were measured at baseline and week 10.ResultsAn ANOVA analysis indicated no significant group by time interactions (p > 0.05) for all anthropometric measures, and maximum oxygen consumption (VO2max). A significant group by time interaction, however, was found for the one-repetition maximum (IRM; p < 0.001, ES= 0.751 , moderate). A post-hoc test indicated an increase in the pre-to-post mean 1RM for HCRT (p = 0.001, ES = 1.83, large). There was a significant group by time interaction for miR-155 (p = 0.05, ES = 0.014, trivial). Levels for miR-155 underwent pre-to-post HIIT increases (p = 0.045, ES = 1.232, large). Moreover, there were also significant group by time interactions for TC (p = 0.035, ES = 0.187, trivial), TG (p < 0.001, ES = 0.586, small), LDL-C (p = 0.029, ES = 0.200, small) and HDL-C (p = 0.009, ES = 0.273, small). Post-hoc tests indicated pre-post HCRT decreases for TC (p = 0.001, ES = 1.44, large) and HDL-C (p = 0.001, ES = 1.407, large). HIIT caused pre-to-post decreases in TG (p = 0.001, ES = 0.599, small), and LDL-C (p = 0.001, ES = 0.926, moderate).ConclusionsBoth training regimes did not improve cardiovascular fitness. But, HCRT improved lower/upper limb muscle strength, and HIIT resulted in an increase in miR-155 expression in peripheral blood mononuclear cells. Furthermore, HIIT and HCRT each improved selected metabolic risk factors including lipid profiles and glucose and insulin metabolism in overweight/obese middle-aged women.Trial registrationOSF, October, 4th 2023. Registration DOI: https://doi.org/10.17605/OSF.IO/UZ92E. osf.io/tc5ky. “Retrospectively registered”.

The Influence of High Intensity Interval Training on Improving Physiological Performance and Social Status in a Sedentary Lifestyle: Review of the Literature

High-Intensity Interval Training (HIIT) has skyrocketed and become the most interesting training trend this year, providing short and effective training sessions to shape the ideal body. The World Health Organization (WHO) has recommended engaging in at least 150-300 minutes of moderate-intensity physical activity at 40-60% of the Maximal Heart Rate (MHR) or opt for 75-150 minutes of high-intensity/vigorous exercise. Physical activity at 60-85% MHR per week can maintain and improve fitness in adults. However, frequently cited challenges to engaging in physical activity are time limitation, low motivation, and non-compliance with established guidelines. This study aims to determine the effect of HIIT on physical fitness, VO2Max, and social status. The study employed a literature review, searching for articles from electronic databases, such as PubMed, ScienceDirect, ProQuest, and Google Scholar. The results showed that HIIT can improve physical fitness and have a significant and efficient positive effect on social status. In conclusion, HIIT training can potentially improve physical fitness, VO2max, and social status in adults with a sedentary lifestyle. Keywords: HIIT, Physical Fitness, VO2Max, Social Status, Sedentary Lifestyle.

Applicability of a supramaximal high-intensity interval training program for older adults previously not engaged in regular exercise; analyses of secondary outcomes from the Umeå HIT Study

This analysis of secondary outcomes investigated the applicability of supramaximal high-intensity interval training (HIT) with individually prescribed external intensity performed on stationary bicycles. Sixty-eight participants with a median (min; max) age of 69 (66; 79), at the time not engaged in regular exercise were randomized to 25 twice-weekly sessions of supramaximal HIT (20-min session with 10 × 6-s intervals) or moderate-intensity training (MIT, 40-min session with 3 × 8-min intervals).The primary aim was outcomes on applicability regarding; adherence to prescribed external interval intensity, participant reported positive and negative events, ratings of perceived exertion (RPE 6–20), and affective state (Feeling Scale, FS -5–5). A secondary aim was to investigate change in exercise-related self-efficacy (Exercise Self-Efficacy Scale) and motivation (Behavioural Regulations in Exercise Questionnaire-2).Total adherence to the prescribed external interval intensity was [median (min; max)] 89 % (56; 100 %) in supramaximal HIT, and 100 % (95; 100 %) in MIT. The supramaximal HIT group reported 60 % of the positive (112 of 186) and 36 % of the negative (52 of 146) events. At the end of the training period, the median (min; max) session RPE was 15 (12; 17) for supramaximal HIT and 14 (9; 15) for MIT. As for FS, the median last within-session rating was 3 (−1; 5) for supramaximal HIT and 3 (1; 5) for MIT. Exercise-related motivation increased (mean difference in Relative Autonomy Index score = 1.54, 95 % CI [0.69; 2.40]), while self-efficacy did not change (mean difference = 0.55, 95 % CI [-0.75; 1.82]), regardless of group.This study provide support for supramaximal HIT in supervised group settings for older adults.

Effect of HIIT on Motor Performance in Female Handball Players

Abstract: The aim of this study was to investigate the effects of interval training at four different intensities in addition to handball training for 8 weeks on aerobic-anaerobic, speed and agility pa-rameters in female handball players. Twenty female handball players (experimental group: 10; control group: 10) voluntarily participated in the studyThe experimental group trained in high-intensity interval training (HIIT) 3 days a week for 8 weeks in addition to handball training, while the control group was allowed to continue their standard training program. The anaerobic capacity, speed, and agility of the experimental and control groups were measured twice before and after an 8-week training program. The HIIT training program for the experimental group was adapted to the movements most commonly used in handball. The values of the data obtained from the handball players were analyzed. ANOVA for mixed measures was applied to determine the difference between the pre-test and post-test values of the experimental and control groups. There was a statistically significant difference (p &lt; 0.05) between the pre and post-test values of the 20-m sprint test of the experimental and control groups of HIIT training for handball players, while there was no statistically significant difference between the pre and post-test values of the anaerobic capacity and agility test of HIIT training. In conclusion, it is recommended to include HIIT training in the training periodization of handball players during the season, and it is believed that it will have a positive effect on players' speed performance.

The Effect of HIIT on Increasing VO2 Max in White Water Rafting Athletes

This research was carried out to find out the effect of training using the High Intensity Interval Training (HIIT) model on increasing VO2 Max in white water rafting athletes. This research design is an experimental pre-post design. This research used 28 white water rafting athletes, consisting of 16 male athletes and 12 female athletes. The athlete's age range is 16-22 years. All research subjects were in healthy condition. All subjects were given the same treatment, namely training using the HIIT model. Intervention with HIIT cardio training. The HIIT training model uses an intensity of 90-100% of Maximal Heart Rate (MHR). HIIT is done with a ratio of 30 seconds of exercise then 3 minutes of rest. Exercise uses an intensity of 90% MHR in the first week and will be increased every week until it reaches 100% MHR. Exercises were carried out for 6 weeks with a frequency of 4x per week. VO2 Max measurements are carried out using a multistage test instrument. In this research, it can be seen that HIIT exercise carried out for 6 weeks with a frequency of 4 times per week can increase athletes' VO2 Max. There is a significant difference in VO2 Max between male and female athletes with a difference test result of P &lt; 0.05. Exercise using the HIIT model which is carried out for 6 weeks with a frequency of 4x a week can increase the VO2 Max of white water rafting athletes. HIIT training can be used as a recommendation to increase VO2 Max for white water rafting athletes.

Effects of High-Intensity Interval Training on Muscle Strength for the Prevention and Treatment of Sarcopenia in Older Adults: A Systematic Review of the Literature.

Sarcopenia is a significant health concern primarily affecting old adult individuals, characterized by age-related muscle loss, and decreased strength, power, and endurance. It has profound negative effects on overall health and quality of life, including reduced independence, mobility, and daily activity performance, osteoporosis, increased fall and fracture risks, metabolic issues, and chronic diseases like diabetes and cardiovascular conditions. Preventive strategies typically involve a combination of proper nutrition and regular physical activity. Among strength training exercises, high-intensity interval training (HIIT) stands out as the most effective approach for improving muscle function in older adults with sarcopenia. The current review identifies and summarizes the studies that have examined the effects of HIIT on muscle strength in older adults as an element of the prevention and treatment of sarcopenia. A systematic search using several computerized databases, namely, MEDLINE/PubMed, Scopus, SPORTDiscus, and Web of Science, was performed on 12 January 2023, according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. A total of 224 studies were initially retrieved. A total of five studies met the selection criteria. HIIT training shows improvements in body composition and functional and cardiorespiratory capacity, has benefits on muscle strength, increases muscle quality and architecture, and is associated with muscle hypertrophy in healthy older adults. Nonetheless, given the shortcomings affecting primary research in terms of the limited number of studies and the high risk of bias, further research is warranted.

The Influence of the HIIT and Aerobic Training Programs on Body Composition.

Purpose: According to studies, the increased risk of obesity in today's general population is mainly caused by insufficient physical activity. In this study, we compared the effect of two types of endurance training. High-intensity interval training (HIIT) and aerobic (continuous) load training and their impact on selected aspects of body composition. Methods: This study included women (n = 14; 32 years old; height 166.3cm; weight 62.5kg) divided into two groups of seven participants. The tested groups were selected by a deliberate selection of 7 probands, training thrice a week for ten weeks. An entrance and exit examination was conducted using non-invasive techniques (anthropometric measurements, body composition analysis – bioimpedance analysis). A paired T-test (p &lt; 0.05) was used for parameter analysis. Cohen's d was used to assess material significance. Results: Despite the small sample of tested women, better results were achieved in the group implementing the high-intensity interval training. However, these data do not allow for assessing a statistically significant difference between the two types of training methods in reducing the percentage of body fat. Changes in monitored parameters were thus evaluated as statistically insignificant. Conclusion: Despite the relevant results, better results were achieved in the HIIT intervention program. The limiting factors of the study were a small research sample with a deliberate selection and insufficient possibility to control eating habits. Furthermore, it is necessary to pay attention to the higher readiness and motivation of the participants. High-intensity interval training, thanks to its variability and low time requirement, proved to be a suitable exercise program for changing body composition not only in people with obesity but also in the adult population in general.

The Influence of Interval Training Combined With Occlusion and Cooling on Selected Hemorheological Blood Parameters in Young Healthy People

Introduction: Changes in blood morphological and rheological parameters and the related mechanisms in the human body are still not fully understood. They should be subjected to constant revisions and analyses, not only specific, but also modified by external factors.Objectives: The aim of the study was to investigate and compare hemorheological parameters of blood during interval training combined with occlusion and cooling in young healthy people.Material and methods: 30 students of the University of Physical Education in Krakow were examined. The VASPER training system was used, offering the possibility of using occlusion factors and local cryotherapy with HIIT (High Intensity Interval Training) training at the same time. Blood from people participating in the project was collected six times (2 weeks before the start of training, immediately before the start of training, after the first training, after 10th training sessions, after 20th training sessions and two weeks after the end of training sessions). The subjects were divided into 3 groups: with occlusion and local cryotherapy, with occlusion and a control group (exercises only). Each person performed the same HIIT training routine, modified by factors depending on the assigned group.Results: In all groups, positive changes in hematological and rheological parameters were observed, occurring at a similar time and pace, regardless of the occlusion and local cryotherapy modifications used.Conclusions: The use of HIIT training using occlusion and cooling, occlusion alone and without additional modifications, can have a positive effect on hematological and rheological parameters in young healthy people and can be used to improve health and well-being. Further research is necessary to confirm the obtained results.

TREINAMENTO INTERVALADO DE ALTA INTENSIDADE EM PESSOAS COM LESÃO DA MEDULA ESPINHAL: REVISÃO SISTEMÁTICA

ABSTRACT Objective: Analyze the effects of high-intensity interval training (HIIT) on cardiometabolic parameters, and cardiorespiratory fitness to compile the most used HIIT training types in adults with spinal cord injury (SCI). Methods: This is a systematic review of searches performed in the electronic databases PubMed / Medline, Science Direct, and Google Scholar. Studies included I) needed to apply HIIT training II) adults with SCI to analyze III) cardiometabolic aspects and cardiorespiratory fitness. Two independent reviewers selected the articles for inclusion, extracted their data, and assessed their methodological quality. Results: 654 studies were found. Thus, 12 studies, 11 pre- and post-intervention, and one control group (CG) with 106 participants were analyzed. Pre- and post-HIITT intervention results revealed significant improvement in cardiorespiratory fitness and cardiometabolic aspects (VO2peak, LDH, HDL, insulin resistance). In addition, GC results revealed significant improvement in cardiorespiratory fitness observed in the intervention group (HIIT) compared to the moderate-low intensity (GC) group. Seven studies used the arm ergometer as the primary exercise modality. Two studies described functional electrical stimulation (FES) performed with the arm ergometer plus electrical stimulation in the lower limbs. None reported heart rate dynamics during the study period. Conclusion: High-intensity interval training improves physical fitness and cardiometabolic health in adults with SCI. Evidence level II; Systematic Review of level II studies.

Perceptions of High-Intensity Interval Training Among People With Spinal Cord Injury: A Mixed-Methods Analysis.

This mixed-method project investigated how people with spinal cord injury perceive high-intensity interval training (HIIT). Using a recumbent hand cycle, 11 active men and 9 active women with spinal cord injury or related disease participated in a single HIIT and moderate-intensity continuous training (MICT) session. Following exercise, participants completed surveys assessing enjoyment, self-efficacy, and outcome expectations. Ten participants were randomly selected to participate in a semistructured interview to assess perceptions toward HIIT. Quantitative survey data revealed that participants trended toward enjoying HIIT over MICT (p = .06) with similar levels of self-efficacy and outcome expectations toward HIIT and MICT (p > .05). Qualitative data revealed that participants believed HIIT would enhance long-term physical and self-evaluative outcomes; several barriers emerged that could prevent widespread adoption among the general population with spinal cord injury. Results support HIIT as a viable exercise option, although research should begin exploring ways to remove HIIT-related barriers that people with spinal cord injury may encounter.

COMPARISON OF MORNING AND EVENING HIGH-INTENSITY INTERVAL TRAINING (HIIT) ON SELECTED PARAMETERS IN BADMINTON PLAYERS

In this study, we delve into the realm of high-intensity interval training (HIIT) and its impact on the performance of collegiate badminton players, emphasizing the importance of timing in implementing such training. A total of 45 male college badminton players, aged 18 to 21, regularly engaging in five days of exercise per week for at least one year, participated in the research conducted at Government Degree College (GDC), Qila Didar Singh, Gujranwala, Punjab, Pakistan. The participants exhibited a mean age of 19.48 ± 1.29 years, a height of 170.31 ± 7.15 cm, a weight of 64.37 ± 6.59 kg, and a BMI of 22.22 ± 2.12. The research protocols comprised a ten-minute warm-up followed by ten minutes of HIIT, with measurements taken during the morning (09:30-10:30 a.m.) and evening (05:00-06:00 p.m.) sessions. Evaluation of aerobic fitness, speed, and agility utilized the 20m shuttle run test, Sprint time over 20m, and SEMO agility test. Results revealed significant differences in scores between morning and evening HIIT programs (p &lt; .05). However, no significant disparities were noted in the performance times of these tests between the two time frames (p &gt; .05). In conclusion, this study suggests that HIIT training can enhance badminton players' performance, irrespective of whether it is conducted in the morning or evening.

The Effect of an 8-Week Online High-Intensity Interval Training Program on Body Composition and Performance in Thai Professional Football Players During the Covid-19 Epidemic

Background/objectives. High-intensity interval training (HIIT) was used to be a strategy for improving physical performance. Especially, athletic training which were disturbed by the Covid-19 pandemic. Therefore, the objectives of this study were to determine the effects of an 8-week online HIIT program on the body composition, aerobic and anaerobic performances in professional football players. Materials and methods. Thirty professional football players in Thai league division 2 were randomly assigned into the onsite group (n = 15) and the online group (n = 15). All participants performed the HIIT program at 85% maximal heart rate (HRmax), five times a week for 8 weeks. Body composition, aerobic and anaerobic performance at baseline, after 4 weeks and 8 weeks of training were calculated by repeated measures ANOVA and unpaired t-test. Results. Weight, BMI and % fat were significantly decreased after 4 weeks of training in the onsite group and after 8 weeks of training in the online group (p &lt; 0.05). FFM in the onsite and online groups was significantly increased after 4 weeks and 8 weeks of training, respectively (p &lt; 0.05). Aerobic performance was significantly increased after 4 and 8 weeks of training (p &lt; 0.05), whereas anaerobic performance was found increased after 8 weeks of training in both groups (p &lt; 0.05). There were no significant differences between the groups. Conclusions. Eight weeks of HIIT training can improve body composition, aerobic performance and anaerobic performance in both onsite and online conditions. It may be implied that an online HIIT training program should have beneficial effects similar to those provided in onsite condition.

The effect of concurrent high-intensity interval training and resistance training on the lower body maximal strength and explosive power: A updated systematic review and meta-analysis

BACKGROUND: Endurance training can have a negative impact on strength training and may lead to reduced strength gains, known as the interference effect. However, high-intensity interval training (HIIT) as an endurance training mode may reduce this interference effect. OBJECTIVE: This systematic review and meta-analysis aim to investigate the effects of concurrent HIIT and resistance training (RT) on lower body explosive strength and maximum strength. METHODS: Five electronic databases were searched. Subgroup analyses were performed to assess the effects of HIIT modality, training status, and training duration on strength development following concurrent HIIT and RT. RESULTS: Meta-analysis showed that compared to RT alone, concurrent HIIT and RT will not affect the development of countermovement jump (CMJ) (WMD =-0.17, 95%CI =-1.45 to -1.11) and half squat (WMD =-0.05, 95%CI =-2.42 to 2.32). Further, subgroup analysis revealed that HIIT-running workout was conducive to the development of both CMJ and half squat. Longer training duration was found to be more effective in developing CMJ, while shorter training duration was more suitable for developing half squat. Additionally, athletes showed greater improvement than non-athletes. CONCLUSIONS: Combining HIIT and RT can enhance CMJ and half squat. The results of intervention are moderated by training variables and training status.

Response to physical activity of females with multiple sclerosis throughout the menstrual cycle: a protocol for a randomised crossover trial (EMMA Project)

The relationship between multiple sclerosis (MS) and females is a crucial aspect in the development of the disease, with the ovarian hormonal cycle being a sensitive stage, especially in females...

Exercise and Insulin Resistance Markers in Children and Adolescents With Excess Weight

Although benefits have been reported for most exercise modalities, the most effective exercise approaches for reducing insulin resistance in children and adolescents with excess weight and the optimal exercise dose remain unknown. To compare exercise training modalities and their association with changes in insulin resistance markers among children and adolescents with excess weight and to establish the optimal exercise dose. For this systematic review and network meta-analysis, 6 electronic databases (PubMed, EMBASE, Cochrane Central Register of Controlled Trials, Scopus, Web of Science, and CINAHL) were searched for studies from inception to April 1, 2023. Randomized clinical trials (ie, randomized controlled trials and randomized trials without a control group) were included if they reported outcomes associated with aerobic training, resistance training, high-intensity interval training (HIIT), or a combination of these interventions. Data extraction for this systematic review was conducted following a network meta-analysis extension of the Preferred Reporting Items for Systematic Reviews and Meta-Analyses reporting guideline. Effect sizes were calculated as the mean difference (MD) with 95% CI using random-effects inverse-variance models with the Hartung-Knapp-Sidik-Jonkman method. The hierarchy of competing interventions was defined using the surface under the cumulative ranking curve. The Cochrane Risk-of-Bias tool, version 2 (RoB2), was used to independently assess the risk of bias of the included studies. The certainty of evidence in consistent networks was assessed using the Grading of Recommendation, Assessment, Development and Evaluation approach. The study protocol was prospectively registered with PROSPERO. Data analyses were conducted between May and June 2023. The primary outcomes were fasting glucose, insulin, and homeostatic model assessment for insulin resistance (HOMA-IR). This analysis included 55 studies with a total of 3051 children and adolescents (mean [SD] age, 13.5 [2.3] years; 1537 girls [50.4%] and 1514 boys [49.6%]). Exercise was associated with reductions in fasting insulin (MD, -4.38 μU/mL [95% CI, -5.94 to -2.82 μU/mL]) and HOMA-IR (MD, -0.87 [95% CI, -1.20 to -0.53]). A nonlinear association in both markers was observed, with a required minimal exercise dosage of approximately 900 to 1200 metabolic equivalent of task minutes per week, especially in children and adolescents with insulin resistance at baseline. Combination HIIT and resistance training and concurrent training were the most effective approaches for reducing insulin resistance markers. On average, the certainty of evidence varied from low to moderate. These findings underscore the role of exercise interventions in enhancing insulin resistance markers among children and adolescents with overweight and obesity. It is advisable to include resistance exercises alongside aerobic and HIIT programs for a minimum of two to three 60-minute sessions per week.

Effects of Time-Efficient Occupational Exercise on Cardiorespiratory Fitness in Firefighters.

For a cohort of operational firefighters, we assessed the effects of workplace-based high-intensity interval training (HIIT) on cardiorespiratory fitness. Fifteen firefighters performed HIIT or moderate-intensity continuous training for 4 weeks. Outcomes were peak oxygen uptake, time trial performance, and affective (pleasure/displeasure) responses to exercise. There was an increase in peak oxygen uptake for both conditions, although this did not reach statistical significance ( P = 0.06, η2 = 0.26) and time trial performance improved for both groups (2%, P < 0.01, η2 = 0.51). Affective responses were more favorable for HIIT, but both conditions avoided excessive sensations of displeasure. Results suggest that workplace-based HIIT improved fitness and performance to a similar magnitude to moderate-intensity continuous training while avoiding overly negative affective responses and could improve occupational health of firefighters, despite reduced time commitment.

The effect of acute high-intensity interval training and Tabata training on inhibitory control and cortical activation in young adults.

Physical exercise not only benefits peoples' health, but also improves their cognitive function. Although growing evidence suggests that high-intensity interval training (HIIT) is a time-efficient exercise regime that can improve inhibitory control performance by enhancing cortical activation in the prefrontal cortex, less is known about how Tabata training, a subset of HIIT that requires no equipment or facilities to perform, affects inhibitory control and cortical activation in young adults. Therefore, we aimed to reveal the effect of an acute bout of HIIT and Tabata training on inhibitory control and attempted to identify its potential neural substrates. Forty-two young adults (mean age: 19.36 ± 1.36 years; 21 females) performed the Stroop task and Simon task before and after acute HIIT, Tabata training, or a control session, and cortical hemodynamic changes in the prefrontal area were monitored by functional near-infrared spectroscopy (fNIRS) during the tasks. Both HIIT and Tabata interventions lasted for a total of 12 min. The HIIT participants performed ergometer cycling at their 80% maximal aerobic power at 90-100 rpm, and the Tabata participants performed a total of 8 intense activities, such as jumping jacks, high knees, and butt kickers, without using equipment or facilities, keeping the heart rate at 80-95% of their maximum heart rate. Participants in the control group watched a sport video while sedentary. Cognitive tasks data and fNIRS data were analyzed by repeated-measures three-way ANOVA. Our results indicated that both the HIIT and Tabata groups exhibited reduced reaction times after the intervention, and there were alterations in activation patterns in the dorsolateral and ventrolateral prefrontal cortices.

Effect of High Intensity Interval Training on Reducing Insulin Resistance, Serum Asprosin, and Body Fat Percentage in Obese Men with Type 2 Diabetes

Background and Objectives Asprosin is an adipokine that has a positive relationship with obesity and type 2 diabetes mellitus (T2DM). It plays an important role in the pathogenesis of insulin resistance due to its gluconeogenic and metabotropic effects. The aim of this study was to determine the effect of six weeks of high intensity interval training (HIIT) on insulin resistance, body fat percentage, and asprosin serum in obese men with T2DM. Subjects and Methods In this quasi-experimental research, 24 obese men with T2DM were randomly divided into HIIT and control groups. Participants in the HIIT group did six weeks of HIIT training with an intensity of 80-85% heart rate reserve in 3 training sessions per week. Fasting blood samples and anthropometric variables were measured 48 hours before and after the intervention. Paired sample t-tests and analysis of covariance were used for statistical analysis. Results After the intervention, there was a significant difference (P&lt;0.001) between the two groups in terms of serum asprosin (-10.47% vs. +0.13%), body fat percentage (-5.17% vs. +0.13%), and insulin resistance (-23.94% versus +10.02%). Conclusion According to the results, it can be stated that adjustment of fasting asprosin to body fat percentage is one of the effective mechanisms for reducing insulin resistance in T2DM via adaptation to HIIT.

High-Intensity Interval Training Ameliorates High-Fat Diet-Induced Metabolic Disorders via the Cyclic GMP-AMP Synthase-Stimulator of Interferon Gene Signaling Pathway.

Metabolic diseases are growing in prevalence worldwide. Although the pathogenesis of metabolic diseases remains ambiguous, the correlation between cyclic GMP-AMP synthase (cGAS)-stimulator of interferon gene (STING) and metabolic diseases has been identified recently. Exercise is an effective intervention protecting against metabolic diseases, however, the role of the cGAS-STING signaling pathway in this process is unclear, and the effect and mechanism of different exercise intensities on metabolic disorders are still unknown. Thus, we explored the association between exercise to ameliorate HFD-induced metabolic disorders and the cGAS-STING signaling pathway and compared the effects of high-intensity interval training (HIIT) and moderate-intensity continuous training (MICT). Male C57BL/6 mice (6-8 weeks old) were fed HFD for 8 weeks to establish a metabolic disease model and were subjected to 8-week MICT or HIIT training. Glucose tolerance tests (GTT) and insulin tolerance tests (ITT) were used to assess glucose metabolism. Serum triglyceride (TG) and total cholesterol (TC) were measured to evaluate lipid metabolism. Oil red staining was used to observe the lipid droplets in the gastrocnemius muscle. An enzyme-linked immunosorbent assay was used to detect the serum inflammatory factors IL-6 and IFN-β. The protein expression of the cGAS-STING signaling pathway was detected by the WesTM automatic protein expression analysis system. We reported that HFD induced metabolic disorders with obesity, abnormal glucolipid metabolism, and significant inflammatory responses. Both HIIT and MICT ameliorated the above adverse reactions, but MICT was superior to HIIT in improving glucolipid disorders. Additionally, HIIT significantly increased the expression of STING protein, as well as the phosphorylation of TBKI and the ratio of p-IRF3/IRF3. MICT only increased the expression of STING protein. Our findings suggest that HIIT may alleviate HFD-induced metabolic disorder phenotype through the cGAS-STING signaling pathway. However, the improvement of MICT on metabolic disorder phenotype is less associated with the cGAS-STING pathway, which needs to be further explored.