اثر ارتفاع قرارگیری دو نوع کوله بر متغیرهای کینتیکی و کینماتیکی راه رفتن دانش‌آموزان 8 تا 11 سال

نوع مقاله: مقاله پژوهشی

نویسندگان

1 مربی، گروه تربیت بدنی و علوم ورزشی، دانشگاه پیام نور، تهران، ایران

2 استادیار، گروه بهداشت و طب ورزش، دانشکدۀ تربیت بدنی و علوم ورزشی دانشگاه تهران، تهران، ایران

چکیده

هدف از تحقیق حاضر بررسی اثر ارتفاع قرارگیری (پایین و میانه پشت) دو نوع کوله (کوله‌پشتی مرسوم و کوله اصلاح‌شده) با بار 10 درصد وزن بدن، بر پارامترهای کینتیکی (شامل حداکثر نیروی عمودی اول و دوم، حداقل نیرو و نرخ بارگذاری) و کینماتیکی (شامل آهنگ قدم‌برداری، طول و عرض گام، مدت مرحلۀ نوسان و حمایت دوگانه) راه رفتن دانش‌آموزان بود. 28 پسر دبستانی پس از بررسی معیارهای ورود و خروج در پژوهش شرکت کردند و در چهار حالت شامل کوله‌پشتی پایین، کوله‌پشتی میانه، کوله اصلاح‌شدۀ پایین، و کوله اصلاح‌شدۀ میانه پشت با دستگاه تردمیل گیت‌وی ارزیابی شدند. آزمون اندازه‌های تکراری نشان داد میانگین پیک اول و دوم کوله‌پشتی میانه پشت از سایر حالت‌ها بالاتر است و با حالت پایین پشت اختلاف معنادار دارد (05/0>P). بین کوله‌ها نیز حداقل نیروی عمودی در کوله‌پشتی پایین، بیشتر از هر دو وضعیت کولۀ اصلاح‌شده بود (05/0>P). با توجه به افزایش پیک اول و دوم نیرو در موقعیت میانه نسبت به موقعیت پایین در کوله‌پشتی، به‌نظر می‌رسد قرار دادن کوله‌پشتی در ناحیۀ کمر از نظر نیروی وارده به بدن بهتر باشد، ولی این تفاوت برای کولۀ اصلاح‌شده دیده نشد.
 

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