پیش‌بینی ظرفیت‌های هوازی و بی‌هوازی ورزشکاران نخبه با استفاده از تغییرات نسبی لاکتات در مرحله بافرینگ ایزوکاپنیا

نیکویی, روح الله; حسن لی, محسن

doi:10.48308/joeppa.2013.98655

پیش‌بینی ظرفیت‌های هوازی و بی‌هوازی ورزشکاران نخبه با استفاده از تغییرات نسبی لاکتات در مرحله بافرینگ ایزوکاپنیا

نوع مقاله : علمی - پژوهشی

نویسندگان

دانشگاه شهید باهنر کرمان

10.48308/joeppa.2013.98655

چکیده

هدف تحقیق: هدف از مطالعه حاضر پیش بینی ظرفیت‌های هوازی و بی هوازی ورزشکاران نخبه با استفاده از تغییرات نسبی لاکتات در مرحله بافرینگ ایزوکاپنیا بود. روش شناسی: 8 دوچرخه سوار استقامتی و 6 دوچرخه سوار سرعتی نخبه به ترتیب با میانگین سن 29/3±5/22و 33/2±33/21، BMI 97/1±21/24 و 18/1±49/22 در دو جلسه مجزا با فاصله زمانی یک هفته یک آزمون فزاینده استاندارد و یک آزمون فرابیشینه یکنواخت را روی دوچرخه کارسنج تا سر حد واماندگی انجام دادند. در خلال آزمون فزاینده گازهای تنفسی به طور مداوم و نمونه خونی هر سه دقیقه یک بار جهت اندازه گیری لاکتات جمع آوری شد. آستانه لاکتات و آستانه تنفسی جبرانی به ترتیب به عنوان افزایش ناگهانی در نمودار لاکتات – بار کار و معادل تهویه ای دی اکسید کربن تعریف و تعیین شدند. مرحله بافرینگ ایزوکاپنیا به عنوان فاصله بین آستانه لاکتات و آستانه تنفسی جبرانی تعیین گردید. همبستگی بین متغیرها با استفاده از ضریب همبستگی پیرسون تعیین و معنی دار بودن تفاوت بین متغیر‌ها با آزمون T- student مشخص گردید. سطح معنی داری برابر با 05/0 انتخاب شد. نتایج: تغییرات نسبی لاکتات در مرحله بافرینگ در گروه سرعتی به طور معنی دار نسبت به گروه استقامتی بالاتر بود (05/0 >P ). همبستگی معنی دار بین تغییرات لاکتات در مرحله بافرینگ و میزان کسر اکسیژن ( 05/0 >P ) و VO2max (05/0 >P ) بدست آمد. بحث و نتیجه گیری: به طور خلاصه نتایج تحقیق حاضر نشان داد که تغییرات نسبی لاکتات در مرحله بافرینگ ایزوکاپنیا بین ورزشکاران استقامتی و سرعتی متفاوت می‌باشد. همچنین همبستگی معنی دار یافت شده بین تغییرات لاکتات در این مرحله با شاخص‌های هوازی و بی هوازی مؤید این نکته است که می‌توان از این شاخص در جهت پیش بینی ظرفیت‌های هوازی و بی هوازی استفاده نمود.

کلیدواژه‌ها

عنوان مقاله [English]

Prediction of aerobic and anaerobic capacity from lactate relative change during isocapnic buffering phase in elite athletes

چکیده [English]

Purpose: The aim of this study was to investigate the prediction of aerobic and anaerobic capacity from lactate relative change during isocapnic buffering phase in elite athletes. Methods: eight endurance and six sprint elite cyclists participated in the present study and performed one standard incremental test and a supramaximal exercise test on a cycle ergometer until exhaustion in 2 separate sessions. During the incremental test Breath-by-breath measurement of respiratory gas was performed and during the last 30 seconds of each 3-minute stage, blood samples were collected for lactate measurement. Lactate threshold (LT) and respiratory compensatory threshold (RCT) were defined as abrupt increase in blood lactate concentration in lactate - workload and abrupt increase in CO2 respiratory equivalent. Isocapnic buffering phase was defined as the time between LT and RCT. Two independent sample t-test was used for all comparison between groups and the relationship between variables was measured by Person correlation test. Results: lactate relative changes during isocapnic buffering phase in anaerobic cyclists were significantly higher than endurance group (p<0.05). Significant correlation was found between lactate relative changes during isocapnic buffering phase and VO2max (p<0.05) and maximum accumulative oxygen deficiency (p < 0.05). Conclusion: In summery our results showed lactate relative changes during isocapnic buffering phase is different between endurance and anaerobic athletes. Also the significant correlations that found between lactate changes during this phase and aerobic and anaerobic indexes point the note that this variable could be used for prediction of aerobic and anaerobic capacity.

کلیدواژه‌ها [English]

lactate
isocapnic buffering phase
buffering capacity
elite cyclists

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