TY - JOUR
T1 - Effect of countermovement on elbow joint extension power-load characteristics
AU - Miyamoto, Naokazu
AU - Wakahara, Taku
AU - Sugisaki, Norihide
AU - Murata, Koichiro
AU - Kanehisa, Hiroaki
AU - Fukunaga, Tetsuo
AU - Kawakami, Yasuo
N1 - Funding Information:
This study was supported in part by a grant from the Sport Science Research Centre, Waseda University, and by a Grant-in-Aid for Scientific Research from the Ministry of Education, Science, and Culture of Japan (#18300200).
PY - 2010/12
Y1 - 2010/12
N2 - The aim of the present study was to examine elbow joint extension power-load characteristics with and without a countermovement. Eight male participants performed maximal elbow extensions with and without a countermovement against different loads (0, 2.5, 5.0, 7.5, 10.0, 12.5, and 15.0 kg). Electromyographic activity of the lateral and long heads of the triceps brachii and the biceps brachii muscles was recorded. The average joint power in the concentric phase was significantly enhanced in the countermovement condition at all loads except for 0 kg. The optimal load for the maximal joint power was greater in the countermovement (7.5 kg) than in the no countermovement condition (5.0 kg). Electromyographic activity was unchanged over the intensities and conditions. Our results suggest that the optimal load for the maximal joint power depends on the type of action (i.e. with or without a counter-movement), and that the enhanced joint power in the countermovement condition is due primarily to the storage and utilization of elastic energy.
AB - The aim of the present study was to examine elbow joint extension power-load characteristics with and without a countermovement. Eight male participants performed maximal elbow extensions with and without a countermovement against different loads (0, 2.5, 5.0, 7.5, 10.0, 12.5, and 15.0 kg). Electromyographic activity of the lateral and long heads of the triceps brachii and the biceps brachii muscles was recorded. The average joint power in the concentric phase was significantly enhanced in the countermovement condition at all loads except for 0 kg. The optimal load for the maximal joint power was greater in the countermovement (7.5 kg) than in the no countermovement condition (5.0 kg). Electromyographic activity was unchanged over the intensities and conditions. Our results suggest that the optimal load for the maximal joint power depends on the type of action (i.e. with or without a counter-movement), and that the enhanced joint power in the countermovement condition is due primarily to the storage and utilization of elastic energy.
KW - Elastic energy
KW - Electromyography
KW - Stretch reflex
KW - Stretch-shortening cycle
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U2 - 10.1080/02640414.2010.515237
DO - 10.1080/02640414.2010.515237
M3 - Article
C2 - 21049316
AN - SCOPUS:78649730183
SN - 0264-0414
VL - 28
SP - 1535
EP - 1542
JO - Journal of sports sciences
JF - Journal of sports sciences
IS - 14
ER -