Active leg stiffness and energy stored in the muscles during maximal counter movement jump in the aged

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题名:	Active leg stiffness and energy stored in the muscles during maximal counter movement jump in the aged
作者:	Liu, Yu Peng, Chien-Hua Wei, Shun-Hwa Chi, Jung-Chun Tsai, Feng-Ren Chen, Jia-Yean
贡献者:	體育系
关键词:	active leg stiffness energy storage aging counter-movement jump
日期:	2006
上传时间:	2009-11-20 13:22:19 (UTC+8)
摘要:	The purpose of this study was to examine the effects of age on active leg stiffness adjustment, electromyogram (EMG) activities and energy stored during eccentric and concentric phases in performing a maximal functional task involving stretch-shorten cycle. Ten young (24.3 +/- 2 years) and 10 old (68.6 +/- 5 years) healthy male subjects were filmed during maximal performance of counter movement jump (CMJ) and squat jump (SJ) on force plate. Integrated EMG (IEMG), ground reaction force (GRF), active leg stiffness, energy stored/returned and active work done by the muscles were compared between two groups on eccentric (ECC) and concentric (CON) phases of CMJ. The GRF, leg stiffness and energy stored in ECC and GRF, IEMG, energy returned and active work in CON were less in the elderly (p < 0.05). These results demonstrate that the neuromuscular function of adjusting active stiffness, storing elastic energy and optimizing the performance may decrease with age during CMJ. (C) 2005 Elsevier Ltd. All rights reserved.
關聯:	JOURNAL OF ELECTROMYOGRAPHY AND KINESIOLOGY Volume: 16 Issue: 4 Pages: 342-351
显示于类别:	[體育學系] 期刊論文

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