The Relationship between Peak Torque and Electromechanical Delay under Concentric and Eccentric Contractions in Sound Knees

• Published in: Rihabiritēshon igaku Vol. 32; no. 2; pp. 108 - 112
• Main Authors: TSUTSUI, Takao, IHARA, Hidetoshi, TAKAYANAGI, Kiyomi
• Format: Journal Article
• Language: English
• Published: The Japanese Association of Rehabilitation Medicine 1995
• Subjects: concentric contraction; eccentric contraction; electromechanical delay; knee extensor; knee flexor
• ISSN: 0034-351X; 1880-778X; 1880-778X
• DOI: 10.2490/jjrm1963.32.108

The purpose of this study was to examine the relationship between peak torque and electromechanical delay (EMD, a delay between the onset of electrical activity and measurable muscle torque). The subjects were 17 male and 11 female college students (average age was 20.4 years). Peak torque under concentric and eccentric contractions of the knee extensor and flexor muscles and EMD were measured by a KIN-COM isokinetic dynamometer and electromyographic activities sensed by surface electrodes. Peak troque under eccentric contraction was greater than concentric one in both the extensors and flexors. EMD was significantly delayed in the extensors under both contractions. The peak torque had no relationship with EMD under both contraction types.