Hm. Holder-powell et Om. Rutherford, Reduction in range of movement can increase maximum voluntary eccentric forces for the human knee extensor muscles, EUR J A PHY, 80(5), 1999, pp. 502-504
Citations number
12
Categorie Soggetti
Physiology
Journal title
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY AND OCCUPATIONAL PHYSIOLOGY
Using the KinCom 500H isokinetic dynamometer the first part of this study m
easured the characteristics of the force velocity relationship curve for th
e human knee extensors between -1.57 (eccentric) and 3.67(concentric) rads
. s(-1) (-90 and 210 degrees s(1)) for both legs in 4 subjects. A significa
nt increase in force generation was seen in eccentric activity at 0.52 rads
. s(-1) (30 degrees s(-1)) but not at 1.57 rads . s(-1) (90 degrees s(-1))
compared to maximum voluntary isometric force (P < 0.005). This increase w
as, however, lower than would be expected from the classical force-velocity
relationship. The second part of the study examined whether restricting th
e 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 flex
ion) range of movement. Significant increases in force were seen over the s
horter range of movement at 0.52 rads . s(-1) (30 degrees s(-1)) (P = 0.006
) and 1.57 rads . s(-1) (90 degrees s(-1)) (P < 0.001).