نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی کارشناسی ارشد بیومکانیک ، دانشگاه مازندران، بابلسر، ایران
2 دانشیار دانشکدۀ علوم ورزشی دانشگاه مازندران، بابلسر، ایران
3 استادیار دانشکدۀ علوم ورزشی دانشگاه مازندران، بابلسر، ایران.
4 استادیار پژوهشگاه علوم ورزشی، تهران، ایران.
چکیده
هدف از پژوهش حاضر بررسی تأثیر تغییرات ارتفاع زین بر اکسیژن مصرفی و اقتصاد انرژی رکاب‌زنی در دوچرخه‌سواران نخبۀ ملی بود. داده‌های مربوط به تجزیۀ گازهای تنفسی 15 دوچرخه‌سوار مرد شرکت‌کننده در این پژوهش ثبت شد. ارتفاع زین بر اساس استفاده از محدودۀ زاویه فلکشن زانو (25، 30 و 35 درجه) تعیین شد. اکسیژن مصرفی و تهویة ریوی به‌وسیلۀ دستگاه گاز آنالایزر متامکس جمع‌آوری و اقتصاد انرژی از محاسبۀ تغییرات شیب بازده اکسیژن جذبی در هر ارتفاع زین محاسبه شد. برای تجزیه‌وتحلیل داده‌ها از آزمون تحلیل واریانس با مقادیر تکراری دوعاملی استفاده شد. نتایج نشان داد تغییرات ارتفاع زین بر مجموع مصرف اکسیژن اثرگذار است، درحالی‌که بر شیب بازده اکسیژن جذبی به‌عنوان شاخص اقتصاد حرکتی اثر معناداری نداشته است. در پژوهش حاضر دوچرخه‌سواران در ارتفاع زین 30 درجه، میزان اکسیژن مصرفی کمتری نشان دادند و این ارتفاع، در مقایسه با دو ارتفاع زین دیگر در وضعیت بهینه‌تری قرار داشت
کلیدواژه‌ها
عنوان مقاله [English]
Effects of different saddle heights on oxygen consumption and economy of national elite cyclists
نویسندگان [English]
- Shaghayegh Shekari 1
- Mansour Eslami 2
- Fatemeh Salari-Esker 3
- Ali Sharifnezhad 4
1 Department of Sports Biomechanics,, University of Mazandaran ,
2 Department of Sports Biomechanics,, University of Mazandaran ,
3 Department of Sports Biomechanics,, University of Mazandaran ,
4 Department of Sport Biomechanics and Technology— Sport Science Research Institute —
چکیده [English]
The purpose of this study was to determine the effect of saddle height changes on oxygen consumption and economy of cycling in national elite cyclists. Respiratory gases data were collected from 15 men cyclists. Saddle heights were determined based on knee angle values (25°, 30° and 35°). The oxygen consumption and pulmonary ventilation were measured using Metamax gas analyzer and cycling economy was determined by calculating the oxygen uptake efficiency slope (OUES). Two-way analysis of variance with repeated-measurements was used to analysis the data. The results showed that changes in the saddle height could alter the sum of oxygen consumption while no significant effects were found on the OUES and pulmonary ventilation. In the present study, cycling at the saddle height of 30 degree showed less oxygen consumption, thus it could be considered an optimal saddle height position.
کلیدواژه‌ها [English]
- Saddle height
- Economy
- oxygen consumption
- Oxygen Uptake Efficiency Slope (OUES)
- Cycling
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