دانلود مقاله ISI انگلیسی شماره 73837
عنوان فارسی مقاله

افراد دارای ناتوانی ذهنی، سطح فعالیت عضله ای داوطلبانه پایین تری دارند

کد مقاله سال انتشار مقاله انگلیسی ترجمه فارسی تعداد کلمات
73837 2014 8 صفحه PDF سفارش دهید محاسبه نشده
خرید مقاله
پس از پرداخت، فوراً می توانید مقاله را دانلود فرمایید.
عنوان انگلیسی
Individuals with intellectual disability have lower voluntary muscle activation level
منبع

Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)

Journal : Research in Developmental Disabilities, Volume 35, Issue 12, December 2014, Pages 3574–3581

کلمات کلیدی
ناتوانی ذهنی؛ تحریک الکتریکی؛ سطح فعال داوطلبانه؛ عضلات اکستانسور زانو
پیش نمایش مقاله
پیش نمایش مقاله افراد دارای ناتوانی ذهنی، سطح فعالیت عضله ای داوطلبانه پایین تری دارند

چکیده انگلیسی

The aim of this study was to explore the voluntary activation level during maximal voluntary contraction (MVC) in individuals with intellectual disability (ID) versus individuals without ID using the twitch interpolation technique. Ten individuals with mild ID (ID group) and 10 sedentary men without ID (control group) participated in this study. The evaluation of neuromuscular function consisted in three brief MVCs (3 s) of the knee extension superimposed with electrical nerve stimulation (NES) to measure voluntary activation. Muscle activity levels were also measured with surface EMG. The root mean square (RMS) was extracted from the EMG signal. The RMS/Mmax ratio and the neuromuscular efficiency (NME) were calculated. Our results reported that individuals with ID present lower muscle strength (p < 0.001), lower voluntary activation level (p < 0.001), lower RMS values of vastus lateralis (p < 0.05), vastus medialis (p < 0.05), and rectus femoris (p < 0.001) muscles. In addition, our results showed lower RMS/Mmax values in the ID group than in the control group for the VM (0.05 ± 0.01 mV vs. 0.04 ± 0.01 mV; p < 0.05) and the RF (0.06 ± 0.02 mV vs. 0.05 ± 0.02 mV; p < 0.05) muscles. However, no significant difference was reported for the VL muscle (0.05 ± 0.02 mV vs. 0.05 ± 0.02 mV; p = 0.463). Moreover, Individuals with ID present smaller potentiated twitch (p < 0.001). However, no significant difference was reported in the NME ratio. These results suggest that the lower muscle strength known in individuals with ID is related to a central nervous system failure to activate motor units and to some abnormal intrinsic muscle properties. It seems that the inactive lifestyle adopted by individuals with ID is one of the most important factors of their lower voluntary activation levels. Therefore, physical activities should be introduced in life style of individuals with ID to improve their neuromuscular function.

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پس از پرداخت، فوراً می توانید مقاله را دانلود فرمایید.