نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری فیزیولوژی ورزشی، گروه علوم زیستی در ورزش، دانشکده علوم ورزشی و تندرستی، دانشگاه شهید بهشتی، تهران، ایران.

2 دانشیار گروه علوم زیستی در ورزش، دانشکده علوم ورزشی و تندرستی، دانشگاه شهید بهشتی، تهران، ایران.

چکیده

زمینه و هدف: با وجود پژوهش‌های متناقض در زمینه اکسایش چربی ناشی از فعالیت‌های سرعتی- توانی با وهله‌های کمتر از 4-3 بار در روز، پژوهش حاضر، با هدف مقایسه تفاوت اکسیژن مصرفی اضافی پس از ورزش (EPOC)، نسبت تبادل تنفسی (RER) و اکسایش چربی/کربوهیدرات ناشی از فعالیت‌های 20 – ثانیه‌ای مبتنی بر آزمون وینگیت (20-sec WBE) یک و دو وهله‌ای، در مردان دارای اضافه وزن و چاق، انجام شد. روش تحقیق: پژوهش حاضر، در قالب یک طرح نیمه‌تجربی تک گروهی متقاطع با اندازه‌گیری مکرر طی دو مرحله (با یک هفته فاصله)، روی 14 مرد میانسال (میانگین سن 1/3±8/35 سال) داوطلب دارای اضافه وزن و یاچاق (شاخص توده بدنی بیش از 25 کیلوگرم بر متر مربع) انجام شد. داده‌های گازهای تنفسی قبل، حین و ۳۰ دقیقه پس از فعالیت 20-sec WBE یک و دو وهله‌ای اندازه‌گیری گردید. گرم کردن در هر دو روش و بازیافت مابین دو وهله 20-sec WBE، شامل: 30 ثانیه رکاب‌زنی (با سرعت 70-60 دور/دقیقه) با باری معادل یک چهارم 5/7 درصد وزن بدن و نسبت فعالیت به بازیافت 1:1 بدون بار بود که با یک دوره رکاب‌زنی سه دقیقه‌ای بدون بار (با سرعت 60 دور/دقیقه) ادامه یافت. داده‌ها با استفاده از آزمون‌های t زوجی و تحلیل واریانس با اندازه گیری مکرر در سطح معنی‌داری p≤0/05 بررسی شد. یافته‌ها: هزینه انرژی تام و دوره بازیافت، EPOC، و اکسایش کربوهیدرات تام در روش دو وهله‌ای به طور معنی‌دار بیشتر از روش یک وهله‌ای بود؛ در حالی که تفاوت معنی‌داری بین اکسایش چربی نقطه‌ای و تام (از ابتدای گرم کردن تا انتهای دوره بازیافت 30 دقیقه‌ای)، مشاهده نشد. همچنین، تفاوت RER دوره بازیافت، فعالیت یک و دو وهله‌ای معنی‌دار نبود. نتیجه‌گیری: افزایشEPOC  و هزینه انرژی روزانه پس از انجام تنها یک یا دو وهله فعالیت مبتنی بر آزمون وینگیت (40-20 ثانیه/روز)، می‌تواند راهبرد مناسبی برای بهبود اکسایش چربی برای افراد دارای اضافه وزن/چاق با محدودیت زمانی برای ورزش باشد.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of one-and two-high-intensity Wingate-based exercise on fat oxidation in overweight/obese men

نویسندگان [English]

  • Banipal Tataro 1
  • Afshar Jafari 2

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.

چکیده [English]

Background and Aim: Based on 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 (mean 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 (at speed 60-70 RPM) with an exercise-to-recovery ratio 1:1 with or without a quarter of 7.5 percent of body weight that continued cycling at 60 RPM with no resistance for three minutes. The data were analyzed using paired-t and repeated ANOVA tests at a significance level of 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. 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. However, no significant difference were found in RER between the two protocols. 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.

کلیدواژه‌ها [English]

  • Obesity
  • overweight
  • Short-term sprint exercise
  • Excess oxygen consumption after exercise
  • Fat oxidation
  • Respiratory exchange ratio
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