نوع مقاله : مقاله پژوهشی Released under CC BY-NC 4.0 license I Open Access I
نویسندگان
1 دانشیار گروه فیزیولوژی ورزش، دانشکدۀ تربیت بدنی و علوم ورزشی، دانشگاه حکیم سبزواری، سبزوار، ایران
2 کارشناس ارشد فیزیولوژی ورزش، دانشکدۀ تربیت بدنی و علوم ورزشی، دانشگاه حکیم سبزواری، سبزوار، ایران
3 استاد گروه فیزیولوژی ورزش، دانشکدۀ تربیت بدنی و علوم ورزشی، دانشگاه حکیم سبزواری، سبزوار، ایران
چکیده
هدف تحقیق حاضر، بررسی اثر مصرف کافئین بر متابولیسم سوبسترا و زمان رسیدن به واماندگی در طول فعالیت و یک ساعت بعد از آن در دختران ورزشکار بود. یازده دانشجوی دختر ورزشکار (سن 54/1±23 سال، وزن 99/5±09/56 کیلوگرم، توان هوازی 01/1±21/40 میلیلیتر بر هر کیلوگرم وزن بدن در دقیقه) بهطور داوطلبانه انتخاب و بهصورت تصادفی در یک طرح متقاطع در سه حالت کنترل، دارونما (کپسول نشاسته) و کافئین (mg/kg 5) قرار گرفتند. پروتکل ورزشی شامل دویدن واماندهساز با شدت 70 درصد حداکثر ضربان قلب روی نوار گردان بود. اندازهگیری گازهای تنفسی نیم ساعت قبل از فعالیت در حالت خوابیده (پایه)، در طول فعالیت و یک ساعت بعد از فعالیت بهعنوان EPOC انجام گرفت. مقدار اکسیداسیون چربی، کربوهیدرات و هزینۀ انرژی از طریق کالریسنجی غیرمستقیم اندازهگیری شد. دادهها با استفاده از آزمون کولموگروف- اسمیرنوف، تحلیل واریانس با اندازهگیری مکرر و آزمون تعقیبی LSD در سطح معناداری 05/0P≤ تحلیل شدند. نتایج نشان داد با مصرف کافئین اکسیداسیون کربوهیدرات در طول فعالیت بهطور معناداری افزایش یافت (05/0 >P)، اما در اکسیداسیون چربی اثر معناداری مشاهده نشد (05/0 <P). همچنین مصرف کافئین بر اکسیداسیون سوبسترا در وضعیت EPOC تأثیر معناداری نداشت (05/0 <P)، اما موجب افزایش معنادار زمان رسیدن به واماندگی شد (05/0 >P). در مجموع میتوان گفت دختران ورزشکار برای بهبود زمان رسیدن به واماندگی میتوانند از مصرف مکمل کافئین به مقدار 5 میلیگرم به ازای هر کیلوگرم وزن بدن در زمان یک ساعت قبل از فعالیت ورزشی سود ببرند.
کلیدواژهها
عنوان مقاله [English]
The Effect of Caffeine Consumption on Substrate Metabolism and Time to Exhaustion During Exercise and one Hour after Exercise in Athletic Female
نویسندگان [English]
- Amir Hossein Haghighi 1
- Reyhaneh Adyalbaf Moghaddam 2
- Mohammad Reza Hamedi Nia 3
1 Associate Professor of Exercise Physiology, Faculty of Physical Education and Sport Sciences, Hakim Sabzevari University, Sabzevar, Iran
2 MSc of Exercise Physiology, Faculty of Physical Education and Sport Sciences, Hakim Sabzevari University, Sabzevar, Iran
3 Professor of Exercise Physiology, Faculty of Physical Education and Sport Sciences, Hakim Sabzevari University, Sabzevar, Iran.
چکیده [English]
The purpose of present study was to examine the effect of caffeine consumption on substrate metabolism and time to exhaustion during exercise and one hour after exercise in athletic female. Eleven female athlete students (age 23±1.54 years, body weight 56.09±5.99 kg, and aerobic power 40.21±1.01ml/kg/min) volunteered and were randomly divided into three groups of control,placebo (starch capsule), and caffeine (5 mg/kg), in a crossover design. Exercise protocol included exhausting running on treadmill with 70% of intensity of maximal heart rate. Subjects’ respiratory gases were collected at 30 minutes before exercise in prostrate position, during exercise, and one hour after exercise-as EPOC. The amounts of fat oxidation, carbohydrate and energy expenditure were measured by indirect calorimeter.The data was analyzed using the Kolmogrov – Smirnov, ANOVA with repeated measures and LSD post-hoc tests, at significance level of P≤0.05. The results showed that with caffeine consumption carbohydrate oxidation was significantly increased (p<0.05), but there was no significant effect on fat oxidation (p>0.05). Furthermore, caffeine consumption had no significant effect on substrate metabolism EPOC (p>0.05), while it significantly increased time to exhausion (p>0.05). Therefore, female athletes can increse/improve the time to exhausion by consumption of caffeine supplements (5 mg /kg) 1 hour before exercise.
کلیدواژهها [English]
- caffeine
- Substrate metabolism
- Time to exhaustion
- EPOC
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