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
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
نویسندگان [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.
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