Document Type : Original Article
Authors
1 PhD Student in Exercise Physiology, Department of Biological Sciences in Sport, Faculty of Sport Sciences and Health, Shahid Beheshti University, Tehran, Iran.
2 Associate Professor in Department of Biological Sciences in Sport, Faculty of Sport Sciences and Health, Shahid Beheshti University, Tehran, Iran.
Abstract
Abstract
Background and aim: Based upon conflicting findings regarding fat oxidation induced by high-power (sprint) exercise with less than 3-4 bouts/day, the present study investigated the effect of a single and two-bout 20-second Wingate-based exercise (20-sec WBE) on excess post oxygen consumption (EPOC), respiratory exchange ratio (RER), and fat/carbohydrate oxidation rate in overweight/obese men. Materials and Methods: Fourteen middle-aged (35.8±3.1 years) obese and overweight males (body mass index>25 kg/m2) voluntarily participated in a semi-experimental, within-subject, crossover study design (with a single week washout). Respiratory gas data were measured before, during, and 30 minutes after one- and two-bout 20-second high-power (sprint) 20-sec WBE. Warm-up in both protocols and interval in the two-20 sec WBE protocol consisted of 30 sec WBE (with 60-70 RPM) with an exercise-to-recovery ratio 1:1 (with or without a quarter of 7.5% of body weight) that continued cycling at 60 RPM with no resistance for 3 min. Data (Mean ± Standard Deviation) were analyzed using SPSS software at p<0.05. Results: The energy cost during exercise and recovery, EPOC rate, and total carbohydrate oxidation in the two-bout protocol were significantly higher than in the one-bout protocol (p≤0.05). However, the instantaneous and the total accumulated fat oxidation differences (from the beginning to the end of the 30-minute recovery) were not significant between the two protocols (p>0.05). The respiratory exchange ratio (RER) differences between the two protocols were not significant either (p>0.05). Conclusion: Increasing EPOC and daily energy expenditure after only a single- or two-Wingate-based sprint exercise (20-40 sec/day) may be a suitable strategy to improve fat oxidation for those overweight/obese people who do not have spare time to exercise.
Keywords
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