Influence of joint angular velocity on electrically evoked concentric force potentiation induced by stretch-shortening cycle in young adults.
Influence of joint angular velocity on electrically evoked concentric force potentiation induced by stretch-shortening cycle in young adults.
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DOI：
10.1186/s40064-015-0875-0
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Isaka T
中科院分区：
文献类型：
--
作者：
Fukutani A;Kurihara T;Isaka T
在拉伸-缩短周期 (SSC) 中，向心收缩（缩短阶段）期间获得的肌肉力量会因之前的离心收缩（延长阶段）而增强。本研究的目的是检查关节角速度对 SSC 引起的力增强（SSC 效应）的影响。 12 名健康男性（年龄，24.2±3.2 岁；身高 1.73±0.05 m；体重 68.1±11.0 kg）参与了这项研究。踝关节角度通过测力计被动移动，运动范围从背屈（DF）15°到跖屈（PF）15°。强直性电刺激引起肌肉收缩。同心收缩关节角速度设置为30°/s和150°/s。 SSC效应的大小计算为通过有初步偏心收缩试验的同心收缩获得的关节扭矩与没有初步偏心收缩试验的同心收缩获得的关节扭矩的比率。结果，在 150°/s 条件下计算的三个关节角度的 SSC 效应强度显着大于 30°/s 条件下 (p < 0.05)。这些结果表明，SSC效应的大小受关节角速度的影响，当关节角速度较大时，SSC效应的大小也较大。这种现象可能是由于在大关节角速度条件下增加激活水平的持续时间不足而引起的。当由于收缩持续时间短而增加激活水平的持续时间不足时，预激活（SSC效应的因素之一）会导致关节扭矩显着增加。
During a stretch- shortening cycle (SSC), muscle force attained during concentric contractions (shortening phase) is potentiated by the preceding eccentric contractions (lengthening phase). The purpose of this study was to examine the influence of joint angular velocity on force potentiation induced by SSC (SSC effect). Twelve healthy men (age, 24.2 ± 3.2 years; height, 1.73 ± 0.05 m; body mass, 68.1 ± 11.0 kg) participated in this study. Ankle joint angle was passively moved by a dynamometer, with range of motion from dorsiflexion (DF) 15° to plantarflexion (PF) 15°. Muscle contractions were evoked by tetanic electrical stimulation. Joint angular velocity of concentric contraction was set at 30°/s and 150°/s. Magnitude of SSC effect was calculated as the ratio of joint torque obtained by concentric contraction with preliminary eccentric contraction trial relative to that obtained by concentric contraction without preliminary eccentric contraction trial. As a result, magnitude of SSC effect calculated at three joint angles was significantly larger in the 150°/s condition than in the 30°/s condition (p < 0.05). These results indicate that the magnitude of SSC effect is affected by joint angular velocity, which is larger when joint angular velocity is larger. This phenomenon would be caused by insufficient duration to increase activation level in the large joint angular velocity condition. When the duration to increase activation level is insufficient due to short contraction duration, preactivation (one of the factors of SSC effect) leads to a significant increase in joint torque.
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影响因子：
2.5
作者：
Arakawa, Hiroshi;Nagano, Akinori;Fukashiro, Senshi
通讯作者：
Fukashiro, Senshi
DOI：
10.1046/j.1365-201x.2001.00915.x
发表时间：
2001-12-01
期刊：
ACTA PHYSIOLOGICA SCANDINAVICA
影响因子：
--
作者：
Finni, T;Ikegawa, S;Komi, PV
通讯作者：
Komi, PV
影响因子：
2.5
作者：
DIETZ, V;SCHMIDTBLEICHER, D;NOTH, J
通讯作者：
NOTH, J
影响因子：
2.5
作者：
Nagano, A;Komura, T;Fukashiro, S
通讯作者：
Fukashiro, S
DOI：
10.1097/00005768-199611000-00009
发表时间：
1996-11-01
期刊：
MEDICINE AND SCIENCE IN SPORTS AND EXERCISE
影响因子：
--
作者：
Bobbert, MF;Gerritsen, KGM;VanSoest, AJ
通讯作者：
VanSoest, AJ