Effects Of Sprint Interval Training On Insulin Sensitivity And Glucose Tolerance In Sedentary, Overweight Women: 639 (original) (raw)
Related papers
European Journal of Applied Physiology
Very high-intensity, low-volume, sprint interval training (SIT) increases muscle oxidative capacity and may increase maximal oxygen uptake ( \( {\dot{V}\text{O}}_{{ 2 {\text{max}}}} \) ), but whether circulatory function is improved, and whether SIT is feasible in overweight/obese women is unknown. To examine the effects of SIT on \( {\dot{V}\text{O}}_{{ 2 {\text{max}}}} \) and circulatory function in sedentary, overweight/obese women. Twenty-eight women with BMI > 25 were randomly assigned to SIT or control (CON) groups. One week before pre-testing, subjects were familarized to \( {\dot{V}\text{O}}_{{ 2 {\text{max}}}} \) testing and the workload that elicited 50% \( {\dot{V}\text{O}}_{{ 2 {\text{max}}}} \) was calculated. Pre- and post-intervention, circulatory function was measured at 50% of the pre-intervention \( {\dot{V}\text{O}}_{{ 2 {\text{max}}}} \) , and a GXT was performed to determine \( {\dot{V}\text{O}}_{{ 2 {\text{max}}}} \) . During the intervention, SIT training was given for 3 days/week for 4 weeks. Training consisted of 4–7, 30-s sprints on a stationary cycle (5% body mass as resistance) with 4 min active recovery between sprints. CON maintained baseline physical activity. Post-intervention, heart rate (HR) was significantly lower and stroke volume (SV) significantly higher in SIT (−8.1 and 11.4%, respectively; P \( {\dot{V}\text{O}}_{{ 2 {\text{max}}}} \) ; changes in CON were not significant (3 and −4%, respectively). Changes in cardiac output ( \( {\dot{\text{Q}}} \) ) and arteriovenous oxygen content difference [(a − v)O2 diff] were not significantly different for SIT or CON. The increase in \( {\dot{V}\text{O}}_{{ 2 {\text{max}}}} \) by SIT was significantly greater than by CON (12 vs. −1%). Changes by SIT and CON in HRmax (−1 vs. −1%) were not significantly different. Four weeks of SIT improve circulatory function during submaximal exercise and increases \( {\dot{V}\text{O}}_{{ 2 {\text{max}}}} \) in sedentary, overweight/obese women.
2020
Sprint Interval Training (SIT) has become one of the time-efficient training protocol which capable to improve fitness and health-related measures in healthy as well in overweight individual. The aim of this study was to determine the effects of short term SIT on body mass index (BMI), total body fat percentage, resting heart rate and blood pressure in overweight sedentary women. Eleven women (aged 20.64 ±0.81 years; body mass index, 30.17 (±3.97) kg/m 2 ) participated in this study. After baseline measurement of BMI, total body fat percentage, resting heart rate and blood pressure, participants completed a 2-week SIT intervention, comprising 6 session of 4 to 6 repeats of 30-second Wingate anaerobic sprints protocol on an electromagnetically braked cycle ergometer, with 4-minute recovery time between each repetition. The BMI, total body fat percentage, resting heart rate and blood pressure assessment were repeated as post-intervention. Significant decrease in systolic pressure (108...
Cardiovascular response of postmenopausal women to 8 weeks of sprint interval training
European Journal of Applied Physiology, 2019
Introduction Menopause is accompanied by decreased aerobic fitness and increased risk of cardiovascular disease. Sprint interval training (SIT) is a time-efficient intervention for improving cardiovascular function and aerobic fitness of young adults. Aim To determine the effect of an 8-week SIT program on the cardiovascular function and aerobic fitness of overweight postmenopausal women. Method Thirty overweight postmenopausal women were randomized into exercise (n = 15) or control (n = 15) groups. The intervention group completed three SIT sessions a week for 8 weeks. Each session consisted of 20 min of 8-s sprints and 12 s of light pedalling. Participants also completed 8 min of light aerobic cycle exercise, before and after the SIT intervention. Cardiovascular function including heart rate, stroke volume (SV), and diastolic filling time (DFT) was assessed before and after the intervention and during 8 min of light aerobic exercise. Estimated maximal oxygen uptake (V O 2max) was also assessed. Results Resting SV was increased (p = 0.001) from pre-(77.5 ± 17.0 mL) to post-SIT (81.3 ± 17.0 mL), whereas SV during 8 min of light aerobic exercise was increased (p = 0.000), from pre-(97.8 ± 1.6 mL) to post-test (103.5 ± 17.8 mL). Resting DFT was increased, (p = 0.010), at pre-(333.4 ± 94.4 mL) to post-SIT (357.4 ± 88.2 mL), whereas DFT during 8 min of aerobic exercise was increased, (p = 0.000), from pre-(480.1 ± 99.5 mL) to posttest (527.2 ± 123.0 mL). Predicted V O 2max was increased, (p = 0.016), from pre-(19.5 ± 5.87 mL kg −1 min −1) to post-SIT (21.4 ± 7.02 mL kg −1 min −1). Conclusion SIT improved cardiovascular function and aerobic fitness of overweight postmenopausal women after 8 weeks of exercise. Keywords Sprint interval training • Postmenopausal women • Stroke volume • Diastolic filling time • Aerobic fitness Abbreviations ANCOVA Analysis of co-variance BMI Body mass index BPM Beats per minute BSA Body surface area BP Blood pressure CI Cardiac index CO Cardiac output COP Cardiac output program CRF Cardiorespiratory fitness DFT Diastolic filling time
Scandinavian Journal of Medicine and Science in Sports, 2013
Recently, several studies have examined whether lowvolume sprint interval training (SIT) may improve aerobic and metabolic function. The objective of this study was to systematically review the existing literature regarding the aerobic and metabolic effects of SIT in healthy sedentary or recreationally active adults. A systematic literature search was performed (Bibliotek.dk, SPORTDiscus, Embase, PEDro, SveMed+, and Pubmed).
2019
Aim: The present study aims to compare the effects of high-intensive interval training (HIIT) and all-out supramaximal intensity interval training (SIT) on maximal oxygen uptake (VO2max), work economy (WE), lactate threshold (LT), anaerobic capacity (maximal accumulated oxygen deficit (MAOD)), and 300-and 3000-meter running performance in moderately endurance-trained females. Methods: 11 healthy, non-smoking, and recreational active to moderately endurance-trained females were randomized to perform HIIT or SIT three times per week over 8 weeks. HIIT was performed as 4 x 4-minute treadmill running intervals at 90-95 % of maximal heart rate (HRmax) interspersed with 3-minute active recovery at 70 % of HRmax between intervals. SIT was performed as 10 x 30-second all-out treadmill running intervals interspersed with 3.5-minute active recovery at 70 % of HRmax between intervals. Results: The VO2max and oxygen (O2) pulse increased significantly more after HIIT compared to SIT (p < 0.01 and p < 0.05, respectively). VO2max increased by 8.9 % after HIIT (54.1 to 58.9 ml•kg-1 •min-1) and by 3.3 % after SIT (54.1 to 55.8 ml•kg-1 •min-1). The VO2max improvements were closely followed by O2 pulse improvements of 9.3 % after HIIT and by 3.5 % after SIT. MAOD increased significantly more after SIT compared to HIIT. The SIT group improved MAOD by 32 % (60.6 to 79.8 ml•kg-1), while the changes were not significant after HIIT. The 300-and 3000-meter running performance changes were not significantly different between groups. The 3000-meter running performance improved by 5.7 % after HIIT (843 to 794 seconds) and by 5.7 % after SIT (845 to 797 seconds). The 300meter running performance improved by 5.1 % after HIIT (57.5 to 54.6 seconds) and by 5.7 % after SIT (54.3 to 50.8 seconds). Conclusion: HIIT was significantly more effective in improving VO2max and O2 pulse compared to SIT. SIT was significantly more effective in improving MAOD compared to HIIT. There was no significant difference in WE, LT, 300and 3000-meter running performance changes between groups.
International journal of physiology, pathophysiology and pharmacology, 2016
Sprint interval training (SIT) elicits comparable long-term adaptations versus continuous exercise training (CEX) including increased maximal oxygen uptake (VO2max) and fat utilization. However, there is limited research examining acute hemodynamic responses to SIT. The aim of this study was to examine hemodynamic responses to low-volume SIT. Active men (n=6, VO2max = 39.8 ± 1.7 mL/kg/min) and women (n=7, VO2max = 37.3 ± 5.7 mL/kg/min) performed a ramp-based VO2max test (RAMP) to determine workload for the SIT session. Subjects returned within 1 wk and completed a session of SIT consisting of six 30-s bouts of "all-out" cycling at 130% maximal workload (Wmax) interspersed with 120 s of active recovery. Continuously during RAMP and exercise and recovery in SIT, VO2 was obtained and thoracic impedance was used to estimate heart rate (HR), stroke volume (SV), and cardiac output (CO). Results revealed no significant differences in COmax (p = 0.12, 19.7 ± 2.4 L/min vs. 20.3 ± 1...
Acute Moderate Intensity Exercise Decreases Oxygen Saturation In Obese Women
STRADA Jurnal Ilmiah Kesehatan, 2020
This study aims to analyze acute moderate intensity exercise decreases oxygen saturation in obese women. True experiment with a randomized control group design posttest-only design using 14 obese women aged 19-24 years, body mass index 27-33 kg/m2, percentage body fat (PBF) above 30 % and fasting blood glucose (FBG) below 100 mg/dL, normal hemoglobin, normal systolic and diastolic blood pressure, normal resting heart rate and randomly divided into two groups, namely CON (n=7, control without intervention) and MIE (n=7, moderate intensity exercise). Moderate intensity exercise interventions carried out for 40 minutes using a treadmill. Blood sampling is done 10 minutes after the intervention. Measurement of oxygen saturation using a Pulse Oximeter. The results obtained mean oxygen saturation at CON (98.428±0.534) % and MIE (96.571±0.975) % (p=0.001). Based on the results of the study concluded that moderate moderate intensity acute exercise reduces oxygen saturation in obese women.