تاثیر خستگی عضلات اندام تحتانی بر برخی متغیرهای منتخب سینماتیک، سینتیک و فعالیت عضلات منتخب در راه رفتن مردان جوان فعال

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استاد تمام بیومکانیک ورزشی، دانشکده تربیت بدنی و علوم ورزشی، دانشگاه خوارزمی تهران

2 دانشجوی دکتری بیومکانیک ورزشی، دانشکده تربیت بدنی و علوم ورزشی، دانشگاه خوارزمی، تهران، ایران

3 استاد گروه فیزیوتراپی، دانشکده علوم توانبخشی، دانشگاه علوم پزشکی و خدمات درمانی ایران، تهران، ایران

4 استادیار گروه تربیت بدنی و علوم ورزشی، پژوهشگاه تربیت بدنی و علوم ورزشی، تهران، ایران

چکیده

مقدمه و اهداف
خستگی بر عملکردهای انسان اثرگذار است. برای حفظ عملکرد حرکتی در حضور خستگی تطابق در متغیرهای سینماتیک، سینتیک و فعالیت عضلات مورد نیاز است. هدف از انجام تحقیق حاضر بررسی اثر خستگی اندام تحتانی بر متغیرهای مذکور در راه رفتن افراد جوان فعال بود.
مواد و روش ها
در تحقیق نیمه­تجربی حاضر 15 مرد سالم فعال (18/3±09/22 سال) با میانگین قد (58/7±177 سانتی­متر) و وزن (72/7±71 کیلوگرم) شرکت کردند. از پروتکل خستگی نشست و برخاست برای خستگی اندام تحتانی استفاده و متغیرهای سینماتیکی و سینتیکی و فعالیت عضلانی منتخب در حین راه رفتن طبیعی آزمودنی­ها قبل و بعد از اعمال پروتکل خستگی جمع­آوری شد. از آمار توصیفی برای تعیین شاخص­های گرایش به مرکز و پراکندگی، از آزمون کولموگروف-اسمیرونوف برای تعیین وضعیت نرمال بودن توزیع داده­ها و از آزمون آماری t همبسته در سطح معناداری (05/0>p) برای مقایسه متغیرهای تحقیق استفاده شد.
یافته ­ها
تغییر در متغیرهای راه رفتن مانند افزایش عرض گام (003/0=p)، سرعت برخورد پاشنه (0001/0>p) و کاهش دورسی فلکشن مچ پا (005/0=p) افزایش فلکشن زانو (0001/0>p) و افزایش اوج اول نیروی عمودی عکس­العمل زمین (004/0=p) و کاهش معنادار در فعالیت عضلات درشت­نی قدامی (044/0=p)، پهن داخلی(001/0=p)، پهن خارجی(005/0=p)، راست­رانی (007/0=p)، نیمه­وتری (044/0=p) و دوسررانی(004/0=p)پس از خستگی مشاهده شد.
نتیجه ­گیری
یافته­ها موید اثر خستگی عضلانی بر متغیرهای راه رفتن بود. افزایش عرض گام، افزایش سرعت برخورد پاشنه و کاهش فعالیت عضلات منتخب اندام تحتانی ممکن است با افزایش نیاز به تعادل پویا در حین خستگی و افزایش خطر آسیب و افتادن ناشی از سرخوردن در ارتباط باشد. افتادن در سالمندان و کودکان می­تواند عوارض نامطلوب روحی و جسمی بر جای بگذارد؛ از این رو در طراحی تمرین­های مرتبط با این گروه­ها توصیه می­شود شدت تمرین در آستانه خستگی حفظ شود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Effect of Lower Limb Muscle Fatigue on Selected Kinematics, Kinetics, and Muscle Activity of the Gait in Active young men

نویسندگان [English]

  • Haider Sadeghi 1
  • Mohamadjavad Razi 2
  • Esmail Ebrahimi Takamejani 3
  • Mohamad Shariatzade 4
1 Full Professor of Sport Biomechanics, School of Physical Education, Kharazmi University of Tehran
2 PhD student of Sport Biomechanics, Kharazmi University, Teheran, Iran
3 Full professor of Faculty of Rehabilitation Sciences, Iran University of Medical Sciences and Health Services, Teheran, Iran
4 Assistant Professor of Sports Sciences Research Institute of Iran (SSRII), Tehran, Iran
چکیده [English]

Background and Aim: According to the previous studies regarding the role of fatigue on performance, the aim of the present study was to investigate the effect of lower limb muscle fatigue on spatio-temporal, ground reaction forces and selected muscle activity of the gait in active young men.
Materials and Method: A total of 15 healthy active male individuals, aged 22.09± 3.18 years, height 58/7±177 cm, and weight 71±7.72 kg, participated in the present quasi-experimental study. Sit to stand fatigue protocol was used for lower limb fatigue and kinematic and kinetic and muscle activity were collected during normal gait before and after fatigue protocol, Shapiro-wilk test was used to ensure the normal distribution of data and paired t-test was run to compare variables at p≤0.05 level.
Results: Changes in gait variables, such as increased step width (p=0.003) and heel contact velocity (p<0.001), reduced ankle dorsiflexion (p=0.005), increased knee flexion (p<0.001), and first peak vertical ground reaction force (p=0.004) as well as a significant reduction in tibialis anterior, vastus medialis, vastus lateralis, rectus femoris, semitendinus, and biceps femoris muscle activity (p<0.05) were observed after fatigue.
Conclusion: The results confirmed the effectiveness of muscle fatigue on gait variables. Increased step width and heel contact velocity and reduced activity of selected lower limb muscles may increase the need for dynamic balance during fatigue and increase the risk of injury. The results of the present study may have clinical values. Falls in the elderly and children may create physical and mental effects. Hence, in designing associated exercises with these groups, it is recommended that intensity of exercises be maintained at fatigue threshold.

کلیدواژه‌ها [English]

  • Lower Limb Muscle Fatigue؛ Gait
  • Kinematics؛ Kinetics؛ Muscle Activity Angle
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