Reduction in range of movement can increase maximum voluntary eccentric forces for the human knee extensor muscles |
| |
Authors: | H M Holder-Powell and O M Rutherford |
| |
Institution: | Department of Sport Sciences, Brunel University, Borough Road, Isleworth, Middx TW7 5DU, UK. |
| |
Abstract: | Using the KinCom 500H isokinetic dynamometer the first part of this study measured the characteristics of the force velocity relationship curve for the human knee extensors between -1.57 (eccentric) and 3.67 (concentric) rads x s(-1) (-90 and 210 degrees s(1)) for both legs in 4 subjects. A significant increase in force generation was seen in eccentric activity at 0.52 rads x s(-1) (30 degrees s(-1)) but not at 1.57 rads x s(-1) (90 degrees s(-1)) compared to maximum voluntary isometric force (P < 0.005). This increase was, however, lower than would be expected from the classical force-velocity relationship. The second part of the study examined whether restricting the range of movement was able to further increase the eccentric forces. In a further 6 subjects, the eccentric contractions were repeated during either an 80 degrees (15-95 degrees flexion) and a 50 degrees (45-95 degrees flexion) range of movement. Significant increases in force were seen over the shorter range of movement at 0.52 rads x s(-1) (30 degrees s(-1)) (P = 0.006) and 1.57 rads x s(-1) (90 degrees s(-1)) (P < 0.001). |
| |
Keywords: | Eccentric force Human skeletal muscle Knee extensors |
本文献已被 SpringerLink 等数据库收录! |