اثر بیتمرینی پس از یک دوره تمرین مقاومتی بر تحریکیپذیری مسیر قشری–نخاعی عضلات بازو
مجله سلامت و ورزش: رویکردهای نوین (سورن),
دوره 2 شماره 3 (1400),
21 آذر 2021
,
صفحه 37-45
https://doi.org/10.22037/soren.v2i3.36984
چکیده
سابقه و هدف: با توجه به نقش سازگاریهای عصبی در تغییرات قدرت به دنبال بیتمرینی، هدف از تحقیق حاضر بررسی تحریکیپذیری مسیر قشری- نخاعی دو عضله آگونیست (دوسر بازویی) و آنتاگونیست (سه سر بازویی) در حرکت جلو بازو به دنبال 4 هفته بیتمرینی پس از یک دوره تمرین مقاومتی با استفاده از متغیرهای دستگاه TMS بود.
روش کار: 12 آزمودنی سالم تمریننکرده (10 نفر گروه تمرین و 2 نفر گروه پایلوت) با میانگین سنی 2.04±28.00 سال و وزن 8.52±70.91 کیلوگرم بهصورت داوطلبانه در این تحقیق شرکت کردند. در هفته صفر (پیشآزمون)، هفته چهارم تمرین، هفته دوم بیتمرینی و هفته چهارم بیتمرینی اندازهگیری دور بازو، یک تکرار بیشینه (1-RM) و همفعالی انجام گرفت و تحریکپذیری قشری- نخاعی (MEP) با استفاده از دستگاههای TMS اندازهگیری شد.
یافتهها: نتایج تحقیق حاضر نشان داد که قدرت در هفته چهارم بیتمرینی سبب کاهش معنادار (10 درصد) در قدرت عضله آگونیست شد. عضله آنتاگونیست نیز همانند عضله آگونیست به بیتمرینی پاسخ داد (هفته دوم 5/2 درصد و هفته چهارم 8 درصد). سطح زیر منحنی MEP در عضله دوسربازویی و سه سر بازویی کاهش معنادار بعد از 4 هفته بیتمرین نشان داد (P=0.003). نتایج رگرسیون نشان داد که تغییرات قدرت با عوامل تحریکی رابطه خطی در دو عضله نداشت.
نتیجهگیری: به طور کلی نتایج تحقیق حاضر نشان داد که تغییرات رخ داده در ناحیه قشری و مسیر قشری- نخاعی محدود به عضله تمرینکرده نیست و بیتمرینی احتمالا سبب کاهش تحریکپذیری مسیر قشری- نخاعی میشود، ولی بین دو عضله در کوتاهمدت تفاوتی مشاهده نشد.
- آگونیست
- آنتاگونیست
- بیتمرینی
- سازگاریهای عصبی
- قدرت ارادی
- همفعالی
ارجاع به مقاله
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