تاثیرات فوری استفاده از کفی آنتی پرونیشن با شیب های متفاوت بر مولفه های نیروی عکس العمل زمین در هنگام راه رفتن

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، گروه بیومکانیک ورزشی، دانشکده علوم ورزشی، دانشگاه بوعلی سینا، همدان، ایران

2 استاد، گروه بیومکانیک ورزشی، دانشکده علوم ورزشی، دانشگاه بوعلی سینا، همدان، ایران

3 استادیار بیومکانیک ورزشی، دانشکده ادبیات و علوم انسانی، دانشگاه آزاد اسلامی، واحد همدان، همدان، ایران

چکیده

مقدمه و اهداف
پرونیشن بیش از حد پا یکی از عوامل خطر برای پارگی لیگامان ضربدری قدامی زانو است.هدف از مطالعه­ی حاضر بررسی اثرهای فوری استفاده از کفی آنتی­پرونیشن با شیب ­های متفاوت بر مولفه ­های نیروی عکس­ العمل زمین در هنگام راه رفتن بود.
مواد و روش ها
تعداد 15 نفر از افراد سالم به صورت داوطلبانه در مطالعه حاضر شرکت کردند. با استفاده از دستگاه وایکان شامل چهار دوربین و همچنین دو دستگاه صفحه نیروی کیستلر مولفه­های نیروی عکس­العمل راه رفتن آزمودنی­ها با و بدون سه نوع کفی داخل کفش با شیب­های 10، 15 و 20 درجه مورد تحلیل قرار گرفت.
یافته ­ها
نتایج تحقیق حاضر نشان داد که هنگام راه رفتن استفاده از کفی با شیب خارجی 20 درجه سبب افزایش نیروی عکس­العمل عمودی (02/0=P) و داخلی-خارجی (02/0=P) شد. همچنین استفاده از کفی­های مختلف تاثیری در مقادیر متغیرهای تکانه، نرخ بارگذاری و گشتاور آزاد ایجاد نکرد (05/0<P).
نتیجه گیری
استفاده از کفی آنتی­پرونیشن با 20 درجه شیب خارجی، نرخ بارگذاری را در مرحله پیشروی کاهش می­دهد، اما در مقابل، نیروی عکس­العمل عمودی و افقی رو به خارج را افزایش داده و نیز زانو را در وضعیت واروس قرار می­دهد که ممکن است با افزایش خطر استئوآرتریت همراه باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Immediate Effects of Anti-Pronation Foot Orthoses with Different Inclination Angles on Ground Reaction Force Components during Walking

نویسندگان [English]

  • Morteza Madadi-Shad 1
  • Nader Farahpour 2
  • Mahdi Majlesi 3
1 PhD Student, Sport Biomechanics Department, Faculty of Sports Sciences, Bu-Ali Sina University, Hamedan, Iran
2 Professor, Sport Biomechanics Department, Faculty of Sports Sciences, Bu-Ali Sina University, Hamedan, Iran
3 Assistant Professor of Sports Biomechanics, Faculty of Humanities, Islamic Azad University, Hamedan Branch, Hamedan, Iran
چکیده [English]

Background and Aims: Excessive foot pronation is one of the major risk factors for anterior cruciate ligament's injuries.The purpose of the present study was to investigate the immediate effects of anti-pronation foot orthoses with various angles on ground reaction force components during walking.
Materials and Methods: A total of 15 healthy volunteers (age: 28.2±8.8 years; height: 179.5±8.4 cm; weight: 76.3±13.5 kg; BMI: 23.7±9.1 kg/m2) participated in the study. A Vicon motion analysis system, including four cameras, and two Kistler force plates were used to measure the ground reaction force components in walking with shoes without foot orthoses as well as walking with shoes and three different foot orthoses (10º, 15º, and 20º of lateral inclinations).
Results: In foot orthoses with 20º inclination, the ground reaction force in vertical and medial-lateral directions at initial heel contact was greater than those without foot orthoses by 5% (p=0.02) and 110% (p=0.02), respectively. Impulse, loading rate, and free moment were not different between walking with different foot orthoses compared with those of walking without foot orthoses (p>0.05).
Conclusion: The application of anti-pronation foot orthoses (20º inclination) can reduce the loading rate at propulsion; however, it may impose loads to the knee which consequently place the knee on genu varum position, facilitating medial knee osteoarthritis.

کلیدواژه‌ها [English]

  • foot
  • Foot orthoses
  • ground reaction force
  • Walking
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