کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4064659 1266221 2014 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Stretch-shortening cycle characteristics during vertical jumps carried out with small and large range of motion
ترجمه فارسی عنوان
خصوصیات چرخه کشش در طول جهش عمودی با طیف وسیعی از حرکت انجام می شود
کلمات کلیدی
شتاب عضله، مدل عضلانی پیشگیری، انرژی الاستیک
موضوعات مرتبط
علوم پزشکی و سلامت پزشکی و دندانپزشکی ارتوپدی، پزشکی ورزشی و توانبخشی
چکیده انگلیسی

In the present study we investigated kinematical characteristics of the knee and ankle extensors to estimate the length change properties of the contractile and the passive elements in countermovement jumps (CMJ) and drop jumps (DJ) performed with small (40°) and large (80°) range of joint motion (SRM and LRM). At SRM the accelerations at maximal muscle lengths compared with the last phase of joint flexion were greater for the gastrocnemius and the soleus (124.9% and 79.4%) and also were greater than at the beginning of joint extension, while no difference was measured at LRM. The differences suggest that at LRM the length change of the serial passive elements from the end of joint flexion to the beginning of joint extension is minimal and simultaneously the length change of the contractile elements is significant, but at SRM – especially in the plantar flexors – the length change of the contractile elements is minimal while in the passive elements significant. It can be presumed that for SRM at the end of joint flexion significant elastic energy is stored and at the beginning of joint extension reused, while for LRM elastic energy storage is not dominant.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Electromyography and Kinesiology - Volume 24, Issue 2, April 2014, Pages 233–239
نویسندگان
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