بررسی اثر سرعت و شیب جاگینگ بر مقدار زاویه پشت پای افراد با پای چرخیده به خارج

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد تربیت بدنی و علوم ورزشی دانشگاه بیرجند . بیرجند، ایران.

2 استادیار بیومکانیک ورزشی دانشگاه بیرجند. بیرجند، ایران.

3 دانشیار بیومکانیک ورزشی دانشگاه بوعلی سینا. همدان، ایران

چکیده

مقدمه و اهداف
هدف از تحقیق حاضر، بررسی اثر تغییر سرعت و شیب تردمیل بر مقدار زاویه­ی پشت پای افراد با پای چرخیده به خارج طی فاز استانس، راه رفتن و دویدن بود.
مواد و روش‌ها
بدین منظور تعداد 15 نفر از دانشجویان پسر به صورت هدفمند و بر اساس شاخص افتادگی استخوان ناوی انتخاب شدند، و پس از قرارگیری نشانگرها بر طبق مدل نشانه‌گذاری کلارک (1983)، هر آزمودنی به مدت 20 دقیقه، عمل راه رفتن و دویدن را در سه شیب (0، 5 و 10 درجه)، و سه سرعت (25/1، 25/2، 25/3 متر بر ثانیه) بدون استفاده از کفش انجام داد. اطلاعات دو بعدی زاویه­ی پشت پای آزمودنی‌ها با استفاده از دو دوربین فیلم‌برداری (125 هرتز)، و سیستم آنالیز حرکت (Hp cosmos para motion) ثبت گردید.
یافته‌ها
نتایج آزمون آنالیز واریانس با اندازه‌گیری‌های مکرر نشان داد که مقدار زاویه­ی پشت پای آزمودنی در نتیجه افزایش شیب تردمیل، به جز در مرحله جدا شدن انگشتان پا از زمین، در سایر مراحل فاز استانس راه رفتن و دویدن از کاهش معنا‌داری برخوردار است. همچنین، پژوهش حاضر نشان داد که با افزایش سرعت تردمیل، مقدار زاویه­ی پشت پای آزمودنی‌ها نیز به‌طور معناداری در کلیه مراحل فاز استانس راه رفتن و دویدن افزایش می‌یابد(001/0p≤).
نتیجه‌گیری
بر اساس نتایج به‌دست‌آمده از محدوده‌های (شیب و سرعت) مورد بررسی، به نظر می‌رسد عامل افزایش سرعت نسبت به عامل افزایش شیب، عامل مؤثرتری در افزایش و ایجاد نوسانات نامطلوب مقدار زاویه­ی پشت پای افراد با پای چرخیده به خارج باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Effect of Speed and Incline on Rear Foot Angle during Jogging in People with Pronate Foot

نویسندگان [English]

  • Hossein Farzaneh 1
  • Saeed Ilbeigi 2
  • Mehrdad Anbarian 3
1 Msc student of Physical Education and Sport Sciences, University of Birjand
2 Assistsnt Professor of Sport Biomechanics, Faculty of Physical Education, University of Birjand
3 Associated Professor of Sport Biomechanics, Faculty of Physical Education, Bu-Ali Sina University
چکیده [English]

Background and aim: The purpose of the present study was to identify the effect of speed and incline on Rear Foot Angle (RFA) during treadmill jogging in people with pronate foot.
Materials and Methods: A total of 15 male students were purposefully selected using navicular drop index. After measuring RFA according to Clarke (1983), each participant walked on the treadmill in three slopes (0°, 5°, and 10°), and three speeds (1/25 m/s, 2/2 m/s 5, 3/25 m/s), without shoes. The RFA angles were recorded during walking using two-dimensional motion caption system (Hp cosmos Para motion) making use of two cameras (125 Hz).
Results: The results of Analysis of Variance with repeated measures showed that the RFA decreased with increasing inclination and speed of running in all phases of running, except for during toe-off the ground. Moreover, the results also showed that increase in the speed of running significantly increased the RFA angle in all phases of walking and running (p≤0/001).
Conclusion: Based on the results of the current research, according to the slope and speed variables, it seems that the speed variable could be considered as a more important factor for untoward oscillations in people with pronate foot than inclination variable.

کلیدواژه‌ها [English]

  • Speed
  • inclination
  • Jogging
  • Rear foot angle
  • Pronate foot
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