European Journal of Applied Physiology and Occupational Physiology

, Volume 61, Issue 1, pp 159–162

Effects of velocity of isokinetic training on strength, power, and quadriceps muscle fibre characteristics

Authors

  • John L. EwingJr.
    • South Dakota State University
  • D. Roy Wolfe
    • Texas Tech University
  • Marc A. Rogers
    • The Exercise Physiology Research LaboratoriesMichigan State University
  • Mark L. Amundson
    • South Dakota State University
  • G. Alan Stull
    • State University of New York at Buffalo
Article

DOI: 10.1007/BF00236711

Cite this article as:
Ewing, J.L., Wolfe, D.R., Rogers, M.A. et al. Eur J Appl Physiol (1990) 61: 159. doi:10.1007/BF00236711

Summary

Twenty young men trained the right knee extensors and flexors on an isokinetic dynamometer three times weekly over a 10-week period. During each session, 10 men in the slow training group completed three sets of 8 maximal contractions at a rate of 1.05 rad s−1, whereas the other 10, the fast group, completed three sets of 20 contractions at a rate of 4.19 rad s−1. Subjects were pre- and post-tested for peak torque and power on an isokinetic dynamometer at 1.05, 3.14, and 4.19 rad s−1. Proportions of muscle fibre-types and fibre cross-sectional areas were determined from biopsy specimens taken before and after training from the right vastus lateralis. When testing was conducted at 1.05 rad s−1, the slow group improved (P<0.05) peak torque by 24.5 N m (8.5%), but no change was noted for the fast group. Power increased (P< 0.05) by 32.7 W (13.6%) in the slow group and 5.5 W (2.5%) in the fast. At 3.14 rad s−1, both groups increased (P<0.05) peak torque and power. At 4.19 rad s−1, the fast group increased (P<0.05) peak torque by 30.0 N m (19.7%), whereas no training effect was observed in the slow group. There was no significant change in power in either group at 4.19 rad s−1, No significant changes were observed over the 10-week training period in percentages of type I, IIa and IIb fibres, but both groups showed significant increases (P<0.05) in type I and IIa fibre areas. No differences were noted between groups, and no hypertrophy of type IIb fibres was observed.

Key words

HypertrophyMuscle morphologyMuscle performanceTraining velocity

Copyright information

© Springer-Verlag 1990