نوع مقاله : مقاله پژوهشی
نویسندگان
1 کارشناس‌ارشد بیومکانیک ورزشی، دانشگاه مازندران
2 دانشیار بیومکانیک ورزشی، دانشگاه مازندران
3 استادیار بهداشت و طب ورزشی، دانشگاه تهران
چکیده
درصد بالایی از آسیب‌های رباط متقاطع قدامی در اثر نیروهای حاصل از برخورد پا با زمین طی تغییر جهت جانبی در شرایط پیش‌بینی‌نشده گزارش شده است. دراین‌راستا، پژوهش حاضر با هدف مقایسة فرکانس نیرو و نرخ بارگذاری بین پای غالب و غیرغالب هنگام تغییر جهت جانبی در شرایط پیش‌بینی‌شده و پیش‌بینی‌نشده انجام گرفت. بدین‌منظور، از بازیکنان تیم ملی اسکواش، آزمون تغییر جهت به‌سمت پای غالب یا غیرغالب در شرایط پیش‌بینی‌شده و پیش‌بینی‌نشده به‌عمل آمد. مطابق با نتایج، اثر متقابلی بین غالب‌بودن پا و شرایط پیش‌بینی مشاهده نمی‌شود؛ اما درمقایسۀ بین پای غالب و غیرغالب، اوج نرخ بارگذاری لحظه‌ای پای غیرغالب بیش‌تر است. همچنین، پهنای باند فرکانس پای غالب و نیز فرکانس 5/99 درصد طیف توان در شرایط پیش‌بینی‌نشده بیش‌تر می‌باشد. پهنای باند فرکانس شرایط پیش‌بینی‌شده نیز بیش‌تر است. برمبنای نتایج می‌توان گفت که فرکانس و نرخ بارگذاری می‌توانند نشان‌دهندۀ تفاوت‌های عملکردی بین پای غالب و غیرغالب عوامل ایجاد آسیب در شرایط پیش‌بینی‌نشده باشند.
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
Comparison of Rate of Loading and Frequency Contents of Impact Force between Dominant and Non-Dominant Leg during Anticipated and Unanticipated Sidestep Cutting Tasks
نویسندگان [English]
- Fereshteh Sahebi 1
- Mansour Eslami 2
- Elham Shirzad 3
1 M.Sc. of Sport Biomechanics, University of Mazandaran
2 Professor of Sport Biomechanics, University of Mazandaran
3 Professor of Corrective Exercises and Sports Injuries, University of Tehran
چکیده [English]
It is reported that a large number of anterior cruciate ligament injuries occurred in effect of impact forces during sidestep cutting. The purpose of this study was comparing loading rate and frequency contents between dominant and nondominant leg during sidestep cutting in anticipated and unanticipated tasks. Squash team players have done side step cutting in direction of dominant and nondominant leg in anticipated and unanticipated situations. The results showed there is no interact effect between dominance and anticipation. The peak of Instantaneous loading rate was higher in nondominant leg. The bandwidth frequency in dominant leg was higher. The frequency of 99.5% of power spectrum was higher in unanticipated sidestep cutting. Also the bandwidth frequency was higher in the anticipated situation. Therefore loading rate and frequency contents can illustrate the functional differences between dominant and nondominant leg. Also, frequency contents can be considerable as risk factors in unanticipated situations.
کلیدواژه‌ها [English]
- Impact Force
- Anticipated and Unanticipated Sidestep Cutting
- Dominant Leg
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