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• W2806007534 abstract "Globally, 1.9 billion adults are overweight, with 600 million classified as obese which creates a serious public health problem (World Health Organization 2015). In 2008, only 20 % of adults in the United States met the CDC physical activity guidelines. Low levels of physical activity contribute to obesity, and a sedentary lifestyle along with obesity is related to higher risk of cardiovascular disease, type 2 diabetes, hypertension, and dyslipidemia (Abate 2000). High intensity interval training (HIIT) induces rapid increases in maximal oxygen uptake (VO2max) in the initial weeks of exercise training, which is essential in obese populations, and is a more time efficient and enjoyable form of exercise than endurance training (Bartlett et al. 2011). Yet, few studies have investigated the effects of different HIIT regimes on change in VO2max in obese, sedentary individuals. PURPOSE: To investigate effects of two HIIT regimes on VO2max and peak power output (PPO) in obese, sedentary women. METHODS: 17 obese sedentary women (age and BMI=37.5±10.5 yr and 39.0±4.7 kg/m2) participated in a six-week exercise intervention with three training sessions per week. Participants were randomized to low volume HIIT (LOW) (n=9, VO2max=21.5±3.2 mL/kg/min) or periodized HIIT (PER) (n=8, VO2max=17.3±2.4mL/kg/min). VO2max was measured on a cycle ergometer at baseline and at 3 and 6 weeks using a ramp exercise test. Women in LOW completed repeated 60 s bouts of HIIT at 70-85% PPO; whereas, women in PER performed a different number of bouts and intensities each week. RESULTS: There was a significant difference in relative (p=0.001; LOW: 21.5±3.2 vs. 22.5±3.2 mL/kg/min; PER: 17.3±2.41 vs. 18.0±2.2 mL/kg/min) and absolute (p=0.002; LOW: 2.1±0.3 vs. 2.2±0.3 L/min; PER: 1.9±0.4 vs. 2.0±0.3 L/min) VO2max across time, but no interaction (p>0.05). PPO also increased in response to training (p=0.01; LOW: 178.4±21.1 vs. 193.7±30.7 W; PER: 169.0±21.2 vs. 174.8±24.1 W) but there was no interaction (p>0.05). CONCLUSION: Although there were no significant differences between regimes, HIIT elicits significant changes in PPO and VO2max in sedentary obese women, which are beneficial to health. The magnitude of change in VO2max is lower than previously-reported values which raises the question if morbid obesity diminishes VO2max response to training." @default.
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• W2806007534 date "2018-05-01" @default.
• W2806007534 modified "2023-09-26" @default.
• W2806007534 title "The Effects of HIIT on Maximal Oxygen Uptake and Peak Power in Sedentary, Obese Women" @default.
• W2806007534 doi "https://doi.org/10.1249/01.mss.0000537098.63136.c7" @default.
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