تأثیر تغییر کیفوز سینه‌ای بر طول بازوی گشتاور بار خارجی هنگام برداشتن بار با دو تکنیک اسکات و استوپ در مردان

نوع مقاله : مقاله پژوهشی اصیل

نویسندگان
مهدی نعمتی معز 1
علی عباسی 2
سید فرهاد طباطبایی قمشه 3
فرشته افتخاری 4
1 دانشجوی دکتری، گروه بیومکانیک ورزشی، دانشکده تربیت بدنی و علوم ورزشی، دانشگاه خوارزمی، تهران، ایران
2 استادیار، گروه بیومکانیک ورزشی، دانشکده تربیت بدنی و علوم ورزشی، دانشگاه خوارزمی، تهران، ایران
3 دانشیار، گروه ارگونومی، دانشگاه علوم بهزیستی و توان‌بخشی، تهران، ایران
4 استادیار، گروه تربیت بدنی و علوم ورزشی، دانشکده علوم تربیتی و روانشناسی، دانشگاه شیراز، شیراز، ایران
10.22122/jrrs.v13i4.2896
چکیده
مقدمه: طول بازوی گشتاور بار خارجی، یکی از عوامل تأثیرگذار بر میزان نیروی وارد شده بر ستون فقرات می‌باشد و یکی از تغییراتی است که صرف ‌نظر از نوع تکنیک برداشتن بار، می‌تواند در کاهش خطر ابتلا به کمردرد تأثیرگذار باشد. تغییر در میزان کیفوز سینه‌ای هنگام برداشتن بار، یکی از عوامل مؤثر بر طول بازوی گشتاور بار خارجی در نظر گرفته می‌شود.مواد و روش‌ها: در تحقیق حاضر از 12 آزمودنی مرد درخواست شد تا با استفاده از دو تکنیک اسکات و استوپ در حالی‌ که وضعیت کیفوز سینه‌ای خود را در شروع حرکت فاز اکستنشن افزایش، کاهش و یا بدون تغییر قرار می‌دهند، جعبه‌ای به جرم 10 و 20 درصد جرم بدن خود را از روی زمین بردارند. جهت محاسبه فاصله عرضی بین جعبه و مهره پنجم کمری، از سیستم آنالیز حرکتی استفاده گردید.یافته‌ها: یافته‌های به دست آمده حاکی از تأثیر معنی‌دار نوع تکنیک (001/0 > P)، ارایه دستورالعمل تغییر در کیفوز سینه‌ای (039/0 = P) و جرم جعبه (001/0 = P) بر طول بازوی گشتاور بار خارجی بود. روابط معنی‌داری بین تکنیک و دستورالعمل (012/0 = P)، تکنیک و جرم (026/0 = P)، دستورالعمل و جرم (029/0 = P) و هر سه عامل تکنیک، دستورالعمل و جرم (006/0 = P) وجود داشت.نتیجه‎گیری: طول بازوی گشتاور خارجی با نوع تکنیک، جرم بار خارجی، الگوی حرکتی و پوسچر ستون فقرات در ارتباط است. به‌ کارگیری تکنیک اسکات، افزایش طول بازوی گشتاور بار خارجی را به همراه دارد و افزایش جرم جعبه به‌ طور کلی و افزایش کیفوز سینه‌ای در تکنیک اسکات، باعث کاهش طول بازوی گشتاور می‌گردد.

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