کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4065310 1266247 2010 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Determination of ankle muscle power in normal gait using an EMG-to-force processing approach
موضوعات مرتبط
علوم پزشکی و سلامت پزشکی و دندانپزشکی ارتوپدی، پزشکی ورزشی و توانبخشی
پیش نمایش صفحه اول مقاله
Determination of ankle muscle power in normal gait using an EMG-to-force processing approach
چکیده انگلیسی

The purpose of this study was to determine the contribution of individual ankle muscles to the net ankle power and to examine each muscle’s role in propulsion or support of the body during normal, self-selected-speed walking. An EMG-to-force processing (EFP) model was developed which scaled muscle tendon unit force output to gait EMG, with that muscle’s power output being the product of muscle force and contraction velocity. Net EFP power was determined by summing individual ankle muscle power. Net ankle power was also calculated for these subjects via inverse dynamics. Closeness of fit of the power curves of the two methods was used to validate the model. The curves were highly correlated (r2 = .91), thus the model was deconstructed to analyze the power contribution and role of each ankle muscle during normal gait. Key findings were that the plantar flexors control tibial rotation in single support, and act to propel the entire limb into swing phase. The dorsiflexors provide positive power for swing phase foot clearance, negative power to control early stance phase foot placement, and a second positive power burst to actively advance the tibia in the transition from double to single support. Co-contraction of agonists and antagonists was limited to only a small percentage of the gait cycle.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Electromyography and Kinesiology - Volume 20, Issue 1, February 2010, Pages 46–54
نویسندگان
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