The differences in changes in selected muscular performance variables were compared between groups trained dynamically, isometrically and isokinetically. 107 young healthy male soccer players with a hypotrophic quadriceps muscle due to 4 to 6 weeks (wk) plaster cast immobilization after knee ligament injuries were randomly assigned to one of five groups: perogressive resistance exercise, one-legged bicycle exercise, maximum isometric contraction, isokinetic low speed contraction and isokinetic high speed contraction. Muscle training was conducted three days per wk for four weeks. The increases in the tested muscle performance variables were of considerable amounts and no significant differences between the five training procedure were demonstrated. The concept of specificity of muscle training as known from training studies of normal muscles, seems not to predominate the recovery of dynamic, isometric and isokinetic performance properties of human skeletal muscle following 4 to 6 wk of plaster immobilization.

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