تاثیر دشواری تکلیف تعادلی و بازخورد بینایی بر فعالیت الکتریکی عضلات منتخب زنان سالمند

نوع مقاله : علمی- پژوهشی

نویسندگان

1 دانشگاه شهید بهشتی

2 دانشکده علوم ورزشی و تندرستی، دانشگاه شهید بهشتی، تهران، ایران.

چکیده

زمینه و هدف: هدف از انجام پژوهش حاضر تعیین تاثیر سطوح مختلف دشواری تکلیف تعادلی و بازخورد بینایی بر فعالیت الکتریکی عضلات منتخب زنان سالمند بود. روش شناسی: در این پژوهش نیمه تجربی 14 زن سالمند سالم با میانگین سنی 57/65 سال به صورت داوطلبانه و دردسترس انتخاب و مورد مطالعه قرار گرفتند. تکلیف شامل حفظ تعادل بر روی دستگاه تعادل سنج بایودکس بود. از هر کدام از آزمودنی ها خواسته شد در 2 شرایط (با بازخورد بینایی و بدون بازخورد بینایی) روی 3 سطح صفحه تعادل با ناپایداری متفاوت (سطوح 10، 8 و 6) بایستند. از دستگاه الکترومایوگرافی مگاوین برای ثبت فعالیت الکتریکی عضلانی در عضلات دوقلوی خارجی، نازک نئی بلند، راست رانی و دو سر رانی استفاده شد و شاخص جذر میانگین مربعات از سیگنال ثبت شده عضلات استخراج شد. مدت زمان هر آزمون 20 ثانیه و زمان استراحت بین آزمون ها 20 ثانیه بود. یافته ها: یافته ها نشان داد که با افزایش دشواری تکلیف تعادلی فعالیت الکتریکی عضلات دوقلو (01/0 =P)، راست رانی (001/0>P)، دوسر ران (028/0=P) و نازک نئی بلند (001/0=P ) افزایش معنی دار داشت و در شرایط با بازخورد بینایی در مقایسه با شرایط بدون بازخورد بینایی، فعالیت الکتریکی عضلات راست رانی (001/0>P)، نازک نئی بلند (01/0 =P) و دو سر ران (001/0 >P) افزایش معنی دار داشت. نتیجه گیری: به طورکلی نتایج این پژوهش نشان داد که افزایش دشواری تکلیف تعادلی و ارائه بازخورد بینایی فعالیت الکتریکی عضلات را افزایش داد.

کلیدواژه‌ها


عنوان مقاله [English]

The Effect of Balance Task Difficulty and Visual Feedback on EMG Activity of Selected Muscles in Elderly Women

نویسندگان [English]

  • Hadis kavianipoor 1
  • Alireza Farsi 2
1 Shahid Beheshti university
2 Faculty of Sports and Health Sciences, Shahid Beheshti University, Tehran, Iran.
چکیده [English]

Background: The purpose of present study was to determine the effect of different levels of balance task difficulty and visual feedback on EMG activity of selected muscles in elderly women. Materials and Method: Fourteen healthy elderly women (mean age 57/65 yr) were selected voluntarily. The task consisted of performing balance task on Biodex Balance System. Participants were asked to stand still on a stability platform under each of two conditions (with visual feedback and without visual feedback) in three levels of difficulty (6, 8 &10). Megawin EMG system was used for recording electromyography of gastrocnemius, rectus femoris, preroneus longus and biceps femoris muscles and RMS of signals was obtained. Duration of each test was 20 seconds and rest times were 20 seconds. Results: Results showed that with increasing task difficulty, preroneus longus (p= 0/01), biceps femoris (p= 0/028), rectus femoris (p < 0/001) and gastrocnemius (p= 0/01) EMG activity increased significantly. In addition, There was a significant increase in preroneus longus (p= 0/01), biceps femoris (p < 0/001) and rectus femoris (p < 0/001) EMG activity in visual feedback condition compared with without feedback condition. Conclusion: the results of this study showed that increasing task difficulty and visual feedback increases EMG activity of muscles

کلیدواژه‌ها [English]

  • Balance task difficulty
  • EMG
  • elderly
  • visual feedback
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