Impact Of High-intensity Interval Training Research Articles

The impact of high-intensity interval training on body composition handball athletes

This research will review the impact of HIIT on the body composition of men's handball athletes and identify several factors. Was to evaluate the impact on body mass index (BMI), fat mass (FM), fat-free mass (FFM) and fat mass index (FMI) on the body composition of Malang City handball athletes. The subjects of this study were 14 men’s athletes, 21 years old, and received the same training program. Explains that the Paired T-Test of BMI is 0.003, Fat Mass is 0.004, Fat-Free Mass is 0.087, and Fat Mass Index is 0.000 because of the sig value. < 0,05. It can be interpreted that there is a significant effect on high-intensity interval training. The impact of high-intensity interval training has a significant impact on body mass index (BMI), fat mass (FM) and body mass index (BMI) on the body composition of handball athletes. The exercises performed have a positive impact on the formation of body composition, in the sport of handball, it takes a lot of explosive movements so ideal body conditions are very supportive of athlete performance. HIIT method is very useful in preparing training programs to form ideal body composition for coaches and the general public.

Impact of High-Intensity Interval Training (HIIT) on Cardiovascular Health in Middle-Aged Chinese Populations

This paper examines the impact of High-Intensity Interval Training (HIIT) on cardiovascular health among the middle-aged Chinese population, amidst the country’s growing burden of cardiovascular diseases (CVDs). Given the escalating prevalence of CVDs influenced by lifestyle changes, aging, and dietary shifts, there’s a pressing need for efficient and accessible interventions. HIIT, with its brief, intense exercise bursts followed by rest periods, emerges as a potent modality to enhance cardiovascular fitness, manage weight, improve metabolic health, and address psychological stress factors, thereby reducing CVD risk factors. This analysis is grounded in research findings, health statistics, and pilot program outcomes, underscoring HIIT’s viability as a public health strategy. The paper delves into the physiological benefits of HIIT, including improvements in VO2 max, blood pressure regulation, lipid profile enhancement, and insulin sensitivity. It also considers the implementation challenges and strategies for HIIT in China, highlighting the role of technology, healthcare provider collaboration, and tailored community initiatives in promoting widespread HIIT adoption. The conclusions drawn emphasize HIIT’s significant potential in mitigating cardiovascular risk among middle-aged Chinese, advocating for its integration into national health promotion efforts.

The effect of six-week bodyweight high-intensity interval training on the performance of young female athletes

This study aimed to assess the impact of high-intensity interval training with bodyweight on the physical performance of young female athletes. Thirteen young female athletes participated in the study. Participants performed HIIT with bodyweight three times a week for six weeks, following five months of standardized training. The study examined participants' aerobic and anaerobic performance, including their countermovement jump (CMJ), 30-meter sprint, change of direction (COD), flexibility, weight, and body mass index (BMI). The study was designed as a single-blind, posttest-only, single-group repeated measurement study. All analyses were conducted with a 95% confidence interval, and a significance level was accepted as α = 0.05. The effect size (ES) was calculated according to Cohen's effect size. The study revealed statistically significant differences in all outputs except for BMI (p < 0.05). Bodyweight HIIT had a large to small effect on the following parameters: VO2max (d = 1.48), Illinois COD test (d = 0.93), 30-meter sprint (d = 0.78), CMJ (d = 0.75), flexibility (d = 0.63), BMI (d = 0.62), peak power (d = 0.61), weight loss (d = 0.58), mean power (d = 0.55). The study results indicated that HIIT with bodyweight could improve the performance of young female athletes.

Lactate-induced autophagy activation: unraveling the therapeutic impact of high-intensity interval training on insulin resistance in type 2 diabetic rats

Impaired autophagy is a hallmark of diabetes. The current study proposed to investigate if high intensity interval training (HIIT) induced lactate accumulation could stimulate autophagy in type 2 diabetic male rats. 28 male Wistar rats were randomly assigned into four groups: Healthy Control (CO), Diabetes Control (T2D), Exercise (EX), and Diabetes + Exercise (T2D + EX). Diabetes was induced by feeding high-fat diet and administrating single dose of streptozotocin (35 mg/kg). After becoming diabetic, the animals in the exercise groups (EX and T2D + EX) performed an eight-week HIIT (4–10 interval, 80–100% Vmax, 5 days per week). Serum levels of lactate, glucose and insulin as well as the levels of lactate, pyruvate, lactate transporter monocarboxylate transporter 1 (MCT1), phosphorylated mitogen-activated protein kinases (p-MAP 1 and 2), phosphorylated extracellular signal-regulated protein kinases 1 and 2 (p-ERK 1 and 2), mammalian target of rapamycin (p-mTOR), ribosomal protein S6 kinase beta-1 (p-70S6k), p90 ribosomal S6 kinases (p-90RSK), autophagy related 7 (ATG7), Beclin-1, microtubule-associated protein 1A/1B, and 2A/2B -light chain 3 levels (LC3-I), (LC3- II), (LC3I/LC3II) in soleus muscle were measured. Homeostatic Model Assessment for Insulin Resistance (HOMA-IR) and serum glucose was lower in T2D + EX compared to T2D group (P < 0.0001). While serum and soleus muscle levels of lactate was not different between T2D and T2D + Ex, the levels of Pyruvate (P < 0.01), MCT1, p-ERK1/2, p-mTOR, p70S6k, P-90RSK, ATG7, LC3-II, and LC3-II/LC3I ratios were higher in T2D + EX compared to T2D group (P < 0.0001). We concluded that eight weeks of high-intensity interval training could activated ERK/P90SRK while inhibiting mTOR/P70S6K signaling pathway in lactate dependent manner. It means increased autophagy which resulted in improve insulin resistance (IR) and reduce blood glucose.

Impact of High-Intensity Interval Training on GLP-1R/ PKBα Axis in Pancreatic Tissue of Diabetes Rats Induced by High-Fat Diet and STZ

Objective: Apart from hormonal factors and oxidative stress, insulin synthesis is strongly dependent on transcription factors in the pancreas. The aim of the present study was to assess the impact of high-intensity interval training (HIIT) on genes affecting insulin synthesis in diabetic obese rats.&#x0D; Materials and Methods: Type 2 diabetes (T2D) was induced by a 6-week high-fat diet (HFD) and intraperitoneal injection of streptozotocin (25 mg /kg) in 14 male Wistar rats (10 week old, 220±10 g). Rats with fasting glucose levels between 400 and 150 were considered T2D. The diabetic rats were randomly assigned to exercise (HIIT: 6 weeks/5 sessions weekly, n= 7) or control (n= 7) groups. Forty-eight hours after the intervention, fasting GLP-1R and PKBα gene expression in pancreatic tissue and plasma insulin and glucose levels were compared between the groups. Data were compared by independent t-test used to compare variables, version 22 between groups. A P&lt; 0.05 was considered significant.&#x0D; Results: HIIT led to significant increase in PKBα gene expression (P: 0.001) and insulin (P: 0.031) and decreases in glucose concentration (P: 0.001) compared with the control group. No change was observed in the GLP-1R gene expression response to HIIT (P: 0.093).&#x0D; Conclusion: HIIT is associated with increased serum insulin levels in T2D obese rats. Despite no change in GLP-1R, this improvement is probably rooted in increased expression PKBα in pancreas in response to this type of exercise training

Dynamics of indicators of cadets’ physical state in the process of high-intensive interval training

The article examines the impact of high-intensity interval training (HIIT) on the dynamics of indicators of the physical state of cadets i.e. future officers of the Air Assault Forces of the Armed Forces of Ukraine. The study was conducted at the Odesa Military Academy in 2022-2023. 60 male cadets took part in the study. Two groups were formed: EG (n=30), whose cadets were engaged in HIIT, and CG (n=30), whose cadets were engaged in current forms of physical training. The physical state of the cadets was assessed using anthropometric and physiometric indicators. Research methods: theoretical analysis and generalization of literature sources, pedagogical observation, medical and biological methods, the methods of mathematical statistics. The positive influence of HIIT on the dynamics of physical state indicators of paratrooper cadets was established. At the end of the experiment, the most of the EG cadets indicators turned out to be significantly better than that of the CG cadets. The most pronounced effect of HIIT was found on indicators of body weight, vital capacity of the lungs, heart rate and hand dynamometry. The obtained results confirm the effectiveness of HIIT in modern conditions of military personnel training. The high level of physical state of paratrooper cadets is the basis of the effectiveness of their educational and future professional and combat activities.

The impact of high-intensity interval training and alternate-day fasting on glucose metabolism in rats on a high-fat diet

Abstract The effect of lifestyle modifications in the form of exercise training and fasting intervention on glucose metabolism in subjects on a high-fat diet is not completely understood. The present study aimed to examine the effects of alternate-day fasting (ADF) and high-intensity interval training (HIIT) on serum levels of C-peptide, fructosamine, and glucose in rats under a high-fat diet. Twenty-eight male Wistar rats were initially fed a high-fat diet for 12 weeks, then randomised into the following four groups: HIIT, ADF, HIIT + ADF, and control (CON). The HIIT and ADF interventions were conducted 3 days per week for 6 weeks. The HIIT induced a significant reduction in serum fructosamine levels compared to other groups (), as well as there was a significant reduction in serum glucose levels compared to the ADF and HIIT + ADF groups (). ADF and HIIT + ADF did not cause any significant changes in fructosamine, glucose, and C-peptide serum levels compared to the CON group (). In subjects under a high-fat diet, HIIT but not ADF or HIIT + ADF may be associated with favourable improvements in glucose metabolism markers.

High-intensity interval training attenuates development of autoimmune encephalomyelitis solely by systemic immunomodulation

The impact of high-intensity interval training (HIIT) on the central nervous system (CNS) in autoimmune neuroinflammation is not known. The aim of this study was to determine the direct effects of HIIT on the CNS and development of experimental autoimmune encephalomyelitis (EAE). Healthy mice were subjected to HIIT by treadmill running and the proteolipid protein (PLP) transfer EAE model was utilized. To examine neuroprotection, PLP-reactive lymph-node cells (LNCs) were transferred to HIIT and sedentary (SED) mice. To examine immunomodulation, PLP-reactive LNCs from HIIT and SED donor mice were transferred to naïve recipients and analyzed in vitro. HIIT in recipient mice did not affect the development of EAE following exposure to PLP-reactive LNCs. HIIT mice exhibited enhanced migration of systemic autoimmune cells into the CNS and increased demyelination. In contrast, EAE severity in recipient mice injected with PLP-reactive LNCs from HIIT donor mice was significantly diminished. The latter positive effect was associated with decreased migration of autoimmune cells into the CNS and inhibition of very late antigen (VLA)-4 expression in LNCs. Thus, the beneficial effect of HIIT on EAE development is attributed solely to systemic immunomodulatory effects, likely because of systemic inhibition of autoreactive cell migration and reduced VLA-4 integrin expression.

Effects of high-intensity interval training, moderate-intensity continuous training, and guideline-based physical activity on cardiovascular metabolic markers, cognitive and motor function in elderly sedentary patients with type 2 diabetes (HIIT-DM): a protocol for a randomized controlled trial.

Sedentary behavior is of increasing concern in older patients with type 2 diabetes mellitus (T2DM) due to its potential adverse effects on cardiovascular health, cognitive function, and motor function. While regular exercise has been shown to improve the health of individuals with T2DM, the most effective exercise program for elderly sedentary patients with T2DM remains unclear. Therefore, the objective of this study was to assess the impact of high-intensity interval training (HIIT), moderate-intensity continuous training (MICT), and guideline-based physical activity programs on the cardiovascular health, cognitive function, and motor function of this specific population. This study will be a randomized, assessor-blind, three-arm controlled trial. A total of 330 (1:1:1) elderly sedentary patients diagnosed with T2DM will be randomly assigned the HIIT group (10 × 1-min at 85-95% peak HR, intersperse with 1-min active recovery at 60-70% peak HR), MICT (35 min at 65-75% peak HR), and guideline-based group (guideline group) for 12 weeks training. Participants in the guideline group will receive 1-time advice and weekly remote supervision through smartphones. The primary outcomes will be the change in glycosylated hemoglobin (HbA1c) and brain-derived neurotrophic factor (BDNF) after 12-weeks. Secondary outcomes will includes physical activity levels, anthropometric parameters (weight, waist circumference, hip circumference, and body mass index), physical measurements (fat percentage, muscle percentage, and fitness rate), cardiorespiratory fitness indicators (blood pressure, heart rate, vital capacity, and maximum oxygen), biochemical markers (high-density lipoprotein, low-density lipoprotein, triglycerides, total cholesterol, and HbA1c), inflammation level (C-reactive protein), cognitive function (reaction time and dual-task gait test performance), and motor function (static balance, dynamic balance, single-task gait test performance, and grip strength) after 12 weeks. The objective of this study is to evaluate the effect of 12 weeks of HIIT, MICT, and a guideline-based physical activity program on elderly sedentary patients diagnosed with T2DM. Our hypothesis is that both HIIT and MICT will yield improvements in glucose control, cognitive function, cardiopulmonary function, metabolite levels, motor function, and physical fitness compared to the guideline group. Additionally, we anticipate that HIIT will lead to greater benefits in these areas. The findings from this study will provide valuable insights into the selection of appropriate exercise regimens for elderly sedentary individuals with T2DM. This study has been approved by the Ethics Review Committee of the Reproductive Hospital Affiliated with China Medical University (approval number: 202203). Informed consent will be obtained from all participants or their guardians. Upon completion, the authors will submit their findings to a peer-reviewed journal or academic conference for publication. Chinese Clinical Trial Registry, identifier ChiCTR2200061573.

Impact of Embedding High-Intensity Interval Training in Schools and Sports Training on Children and Adolescent’s Cardiometabolic Health and Health-Related Fitness: Systematic Review and Meta-Analysis

Purpose: This systematic review aimed to identify studies evaluating the impact of high-intensity interval training when delivered in school and sports training. Methods: A systematic search of 10 databases (September 2019) identified 24 eligible studies (including children and/or adolescents 5–18 years and reporting cardiometabolic health and/or health-related fitness outcomes), assessed for quality using the Cochrane Risk of Bias Tool (version 2.0). Outcomes were synthesized using a random-effects meta-analysis, and potential moderators were explored (i.e., study duration, risk of bias, age, and deliverer/instructor). Results: Standardized mean difference for the effects of high-intensity interval training were significant for body mass index g = −0.27 (p &lt; .001), cardiorespiratory fitness g = 0.27 (p &lt; .001), lower body muscular fitness g = 0.49 (p = .005), and upper body muscular fitness g = 0.37 (p = .002); but not for blood pressure (p &gt; .05). Risk of bias results were variable (low = 8, some concerns = 9, and high = 7). Conclusion: Our findings suggest that embedding high-intensity interval training in schools and sports training can facilitate improvements in some aspects of cardiometabolic health and fitness in children and adolescents.

Impact of high-intensity interval training on tendon related gene expression in rat Achilles tendon

Immobilization or aging associated with limited physical activity can lead to the functional deterioration of tendons, which has become an important public health concern. Therefore, growing research is focused on the effect of exercise training on preserving tendon function. Exercise training subjects muscles and tendons to repeated mechanical stress, and in vitro studies have revealed that repetitive mechanical loading stimulates tendon cell responses to changes in the extracellular matrix and functional properties of the tendon. However, although several types of exercise training have been shown to be effective in preserving tendon function, no studies have investigated the impact of high-intensity interval training (HIIT), which involves composing short bouts of exercise with high-power output. Here, we determined whether the HIIT program enhanced tenogenic progressions by measuring the mRNA expression in rat Achilles tendons. Sixteen rats were randomly assigned into either a sedentary control group (Con, n = 8) or an HIIT group (n = 8). Rats in the HIIT group performed the program with treadmill running; the training volume was incremental (running speed, number of sets, and inclination), and training was conducted 5 days per week for 9 weeks. The rats in the HIIT group exhibited a marked decrease in the body weight and different types of fat weights, and a marked increase in different types of muscle weights. Real-time reverse transcription polymerase chain reaction analysis revealed that mRNA expressions of tendon-related genes Tnxb, Opn, and Tgfb1 were upregulated in the HIIT group compared to that in the Con group. Cross-links in mRNA expressions of collagen-related Dcn and Fmod in the HIIT group tended to be higher than in those Con group. These results suggest that HIIT induces initiation of tenogenic progression and stimulation of cross-link formation between collagen fibrils in rat Achilles tendons.

High-Intensity Interval Training Ameliorates Molecular Changes in the Hippocampus of Male Rats with the Diabetic Brain: the Role of Adiponectin

Alzheimer's disease (AD) is closely related to type 2 diabetes (T2D). This study investigated the impact of high-intensity interval training (HIIT) on diabetes-induced disturbances in AD-related factors (including AMP-activated protein kinase (AMPK), glycogen synthase kinase-3β (GSK3β), and tau protein) in the hippocampus, with the main focus on adiponectin signaling.In total, 28 male Wistar rats at the age of 8weeks were randomly assigned to four groups (n = 7 in each group): control (Con), type 2 diabetes (T2D), HIIT (Ex), and type 2 diabetes + HIIT (T2D + Ex). T2D was induced by a high-fat diet plus a single dose of streptozotocin (STZ). Rats in Ex and T2D + Ex groups performed 8weeks of HIIT (running at 8-95% of Vmax, 4-10 intervals). Insulin and adiponectin levels in serum and hippocampus were measured along with hippocampal expression of insulin and adiponectin receptors, phosphorylated AMPK, dephosphorylated GSK3β, and phosphorylated tau. Homeostasis model assessment for insulin resistance (HOMA-IR), homeostasis model assessment for insulin resistance beta (HOMA-β), and quantitative insulin sensitivity check index (QUICKI) were calculated to assess insulin resistance and sensitivity. T2D decreased insulin and adiponectin levels in serum and hippocampus, as well as the hippocampal levels of insulin and adiponectin receptors and AMPK, but increased GSK3β and tau in the hippocampus. HIIT reversed diabetes-induced impairments and consequently decreased tau accumulation in the hippocampus of diabetic rats. HOMA-IR, HOMA-β, and QUICKI were improved in Ex and T2D + Ex groups. Overall, our results confirmed that T2D has undesirable effects on the levels of some Alzheimer's-related factors in the hippocampus, and HIIT could ameliorate these impairments in the hippocampus.

IMPACTOS DO TREINAMENTO INTERVALADO DE ALTA INTENSIDADE SOBRE A ENDURANCE DOS JOGADORES DE VOLEIBOL

ABSTRACT Introduction: The high-intensity interval training method is believed to improve sports endurance in volleyball players due to its characteristic of alternating short periods of intense aerobic exercise and recovery. Objective: Analyze the impact of high-intensity interval training on sports endurance in volleyball players aged 18 to 19 years old. Methods: We selected 16 male volleyball athletes, and divided them into control and experimental groups. A high-intensity interval training protocol was added to the experimental group, while the control group remained with standard training. The indices of the effect of intensive interval training were measured through the sports endurance test in the athletes, comparing the results before and after the intervention. Results: The exercise index on oblique plates for 30 seconds in the experimental group increased from 58.51±1.06 to 61.17±1.44; there was a change in the 800-meter run from 2.39±0.02 to 2.33±0.02 minutes after the experiment, and the 30kg supine weightlifting in 30 seconds was from 49.93±1.99 to 53.58±1.79. However, the control group data did not change significantly. Conclusion: Long-term appropriate high-intensity interval training played an evident role in improving the endurance of volleyball players. Level of evidence II; Therapeutic studies - investigation of treatment outcomes.

IMPACTO DO TREINAMENTO INTERVALADO DE ALTA INTENSIDADE SOBRE O ÍNDICE DE MASSA CORPORAL EM ESTUDANTES UNIVERSITÁRIOS

ABSTRACT Introduction: Due to academic pressure, many college students feel unmotivated to exercise, leading to serious obesity problems. One of the effective resources for weight loss is high-intensity interval training, but there is no extensive research on the effect on this specific group. Objective: To explore the impact of high-intensity interval training on body fat index (BFI) in college students, analyzing the scientific basis and safety of this exercise training through heart rate indicators. Methods: Two experimental groups, MICT (moderate-intensity continuous training) and HIIT (high-intensity interval training), were compared. The HIIT group used stationary bicycles, according to the high-intensity interval training method. MICT is a moderate-intensity continuous training method, so the load was half that of the HIIT group. Results: The IGC of women after training was 22.81±2.87, the IGC was significantly reduced, and there was a very significant difference; the IGC of men after training was 22.74±2.12, the IGC was significantly reduced, and they very significant difference. This shows that the exercises have a good effect on weight loss. Conclusion: HIIT training is more effective, both in time and strength of adherence. It has a good effect on improving cardiopulmonary function, and optimizing IGC are strongly impacted. Level of evidence II; Therapeutic studies - investigation of treatment outcomes.

The Impact of Moderate-to-High-Intensity Exercise Protocols on Glycated Hemoglobin Levels in Type 2 Diabetes Patients

Type 2 diabetes mellitus (T2DM) is a growing global health issue that is closely linked to the epidemic of obesity. In addition to genetic factors, environmental and health-risk behaviours (i.e., high-carbohydrate diet and physical inactivity) contribute to a variety of pathophysiological disorders. Advanced exercise protocols, such as Moderate-to-intensity (MIT) and High Intensity Interval Training (HIIT), revealed a strategy for mitigating and/or attenuating the DTMII’s harmful effects by controlling glycated haemoglobin (HbA1c) levels. The goals of this review were to summarize the most recent evidence on the impact of HIIT on HbA1c levels. A mini-review protocol was performed through the PubMed/Medline database. The search comprised experimental and randomized controlled trial studies published in English between 2016 and 2021. The terms HbA1c, T2DM, MIT and HIIT, and their analogues were used. A total of seven studies were finally included. Our findings showed that the HIIT protocol is an effective strategy to induce HbA1c balance and improve glycaemic control than moderate training. The HIIT conducted in the laboratory and involving aerobic exercise on a cycle ergometer appears to be more efficient that MIT. Additional findings include improved beta-cell function, decreased low-grade inflammation, and the induction of cardiovascular benefits. More research is required to investigate the feasibility and safety of HIIT protocols in T2DM patients.

High-Intensity Interval Training (HIIT) on Biological and Body Composition Variables in Patients with Musculoskeletal Disorders: A Systematic Review and Meta-Analysis.

In order to assess the impact of high-intensity interval training (HIIT) on biological and body composition variables in patients with musculoskeletal disorders (MSKD), a systematic search on PubMed (Medline), CENTRAL, CINAHL, Web of Science, SPORTDiscus, and Scopus was conducted. Standardized mean differences (SMD) and 95% confidence intervals were calculated and pooled in a meta-analysis using the random-effects model. The effectiveness of HIIT on waist circumference, muscle mass, resting heart rate, resting systolic and diastolic blood pressure, C-reactive protein, body weight, and body fat were determined. GRADE, risk of bias 2, and PEDro scales were employed. HIIT compared to no intervention, minimal intervention, or usual care did not show significant results in its favor on any of the variables studied, except for the resting heart rate when compared with no intervention (SMD = -0.33; 95% CI: -0.63, -0.04; heterogeneity Q value: 0.14; p = 0.93; I2 = 0%). In addition, HIIT also does not seem to be more effective than moderate-intensity continuous training. Based on the results, it seems that HIIT has almost no significant effects on biological and body composition variables, except for resting heart rate, in patients with MSKD.

Impact of High-intensity Interval Training on Glycemic Variability in Older Women With Type 2 Diabetes: Does Volume Matter?

Impact of High-intensity Interval Training on Glycemic Variability in Older Women With Type 2 Diabetes: Does Volume Matter?

Effects of High-Intensity Interval Training (HIIT) on Patients with Musculoskeletal Disorders: A Systematic Review and Meta-Analysis with a Meta-Regression and Mapping Report.

The aim was to assess the impact of high-intensity interval training (HIIT) on patients with musculoskeletal disorders. We conducted a search of Medline, Embase, PEDro, and Google Scholar. We conducted a meta-analysis to determine the effectiveness of HIIT on pain intensity, maximal oxygen consumption (VO2 max), disability, and quality of life (QoL). We employed the GRADE and PEDro scales to rate the quality, certainty, and applicability of the evidence. Results showed significant differences in pain intensity, with a moderate clinical-effect (SMD = −0.73; 95% CI: −1.40–−0.06), and in VO2 max, with a moderate clinical-effect (SMD = 0.69; 95% CI: 0.42–0.97). However, the meta-analysis showed no statistically significant results for disability (SMD = −0.34; 95% CI: −0.92–0.24) and QoL (SMD = 0.40; 95% CI: −0.80–1.60). We compared HIIT against other exercise models for reducing pain intensity and increasing VO2 max. The meta-analysis showed no significant differences in favour of HIIT. Meta-regression analysis revealed that pain intensity scores were negatively associated with VO2 max (R2 = 82.99%, p = 0.003). There is low-moderate evidence that the HIIT intervention for patients with musculoskeletal disorders can reduce pain intensity and increase VO2 max but has no effect on disability and QoL. Results also showed that HIIT was not superior to other exercise models in reducing pain intensity and increasing VO2 max.

INFLUENCE OF HIGH INTENSIVE INTERVAL TRAINING ON STUDENTS

High-intensity interval training (HIIT) appeared as a replacement for long-term exercise programs, primarily continuous aerobic exercise in adults, while in adolescents it represents a more natural way of exercise, unlike traditional moderate-intensity exercise. The aim of this systematic review is to examine the impact of high-intensity interval training in elementary school students, based on the collected data and analyzed research. The literature search was performed using the following databases: PubMed, Google Scholar, DOAJ, MEDLINE. After a detailed analysis, 11 studies met the set criteria and were included in the systematic review. The results indicate that HIIT for a duration of 12 weeks gives statistically significant results in reducing body weight and visceral fat, lowering arterial blood pressure, reducing BMI and increasing VO2max and improving fitness parameters of children. HIIT is an effective way of improving various fitness parameters and health conditions in a school population, with our review research indicating significant improvements in body composition parameters, fitness parameters as well as cardiovascular disease compared to a non-exercising control group.

The Impact of HIIT on the cTnT Response in Sedentary Obese Young Men

Objective: Evaluation of the effect of 8 weeks of High-Intensity Interval Training (HIIT) on the serum level of cardiac troponin T (cTnT) in sedentary obese young men.&#x0D; Materials and Methods: Thirty sedentary men were randomly divided into 3 groups: the 30s HIIT training group (n=10), the 60s training group (n=10), and the control group (no exercise) (n=10). Interval training with 90 %VO2peak was done in 3 sessions for 8 weeks. cTnT was measured 5 times; pre-exercise, 4hrs, and 24hrs after the first session (4hF, 24hF), and 4hrs and 24hrs after the last training session (4hL, 24hL). ANOVA with repeated measures and Bonferroni post-hoc tests were used by SPSS 23 with a significance level of (P&lt; 0.05).&#x0D; Results: The significant increase in serum levels of cTnT in the post-tests of the 60s HIIT compared to the first 24hrs and the last 24hrs (P= 0.0001). But in the 30s group it was not significant compared to the other measurements (P≥ 0/05). In the 2 training groups, serum levels of cTnT in the last 4hr post-tests of the last week were not significantly different from the 4hrs post-tests of the first week (P≥ 0.05).&#x0D; Conclusion: It seems that none of these activities cause heart damage sustained, and changes in cTnT levels in two 4hrs compared to the first and last 24hrs of the 60s group may be due to reversible leakage of cardiac cell membranes, and may continuous exercise will reduce this reduction.