Kues J M, Mayhew T P
Virginia Commonwealth University, Department of Physical Therapy, Richmond 23298-0224, USA.
Physiother Res Int. 1996;1(3):195-204. doi: 10.1002/pri.58.
The purpose of this investigation was to examine the force-velocity relationship during electrically induced, submaximal concentric and eccentric contractions of the quadriceps femoris muscle. Thirty female subjects with no history of knee pathology participated in the study. Force was measured on an isokinetic dynamometer and the quadriceps femoris muscle was electrically stimulated by use of a medium frequency current generator. Subjects were stimulated at 30% of their maximum voluntary isometric force. Four velocities were tested (30 degrees, 90 degrees, 120 degrees and 180 degrees/sec) during both concentric and eccentric contractions. The relationship between force and velocity was examined with an analysis of covariance. The regression model describing the force-velocity relationship for concentric contractions was significant (p < 0.0001) with an R2 of 0.96 and a slope of -0.76 (p < 0.0001). The regression model describing the force-velocity relationship for eccentric contractions was significant (p < 0.0001) with an R2 of 0.91 and a slope of 0.4 (p < 0.0001). The relationship between force and velocity during electrically induced, submaximal concentric and eccentric contractions were similar to in vitro studies that have examined this relationship during shortening and lengthening contractions.
本研究的目的是检测股四头肌在电刺激诱发的次最大收缩向心和离心收缩过程中的力-速度关系。30名无膝关节病变史的女性受试者参与了该研究。使用等速测力计测量力量，并使用中频电流发生器对股四头肌进行电刺激。以受试者最大自主等长肌力的30%对其进行刺激。在向心和离心收缩过程中测试了四个速度（每秒30度、90度、120度和180度）。通过协方差分析来检测力与速度之间的关系。描述向心收缩力-速度关系的回归模型具有显著性（p<0.0001），R2为0.96，斜率为-0.76（p<0.0001）。描述离心收缩力-速度关系的回归模型具有显著性（p<0.0001），R2为0.91，斜率为0.4（p<0.0001）。电刺激诱发的次最大收缩向心和离心收缩过程中力与速度的关系与在体外研究中检测到的缩短和延长收缩过程中的这种关系相似。
