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J Appl Physiol 84: 442-449, 1998;
8750-7587/98 $5.00
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Vol. 84, Issue 2, 442-449, February 1998

Sprint training, in vitro and in vivo muscle function, and myosin heavy chain expression

S. D. R. Harridge1,2, R. Bottinelli3, M. Canepari3, M. Pellegrino3, C. Reggiani3, M. Esbjörnsson4, P. D. Balsom1 and B. Saltin1,2

1 Department of Physiology and Pharmacology, Karolinska Institute, Stockholm; 2 Copenhagen Muscle Research Centre, Rigshospitalet, DK-2200 Copenhagen N, Denmark; 3 Institute of Human Physiology, University of Pavia, I-27100 Pavia, Italy; and 4 Department of Clinical Physiology, Huddinge Hospital, Karolinska Institute, S-114 86 Stockholm, Sweden

Harridge, S. D. R., R. Bottinelli, M. Canepari, M. Pellegrino, C. Reggiani, M. Esbjörnsson, P. D. Balsom, and B. Saltin. Sprint training, in vitro and in vivo muscle function, and myosin heavy chain expression. J. Appl. Physiol. 84(2): 442-449, 1998.---Sprint training represents the condition in which increases in muscle shortening speed, as well as in strength, might play a significant role in improving power generation. This study therefore aimed to determine the effects of sprint training on 1) the coupling between myosin heavy chain (MHC) isoform expression and function in single fibers, 2) the distribution of MHC isoforms across a whole muscle, and 3) in vivo muscle function. Seven young male subjects completed 6 wk of training (3-s sprints) on a cycle ergometer. Training was without effect on maximum shortening velocity in single fibers or in the relative distribution of MHC isoforms in either the soleus or the vastus lateralis muscles. Electrically evoked and voluntary isometric torque generation increased (P < 0.05) after training in both the plantar flexors (+8% at 50 Hz and +16% maximal voluntary contraction) and knee extensors (+8% at 50 Hz and +7% maximal voluntary contraction). With the shortening potential of the muscles apparently unchanged, the increased strength of the major lower limb muscles is likely to have contributed to the 7% increase (P < 0.05) in peak pedal frequency during cycling.

contraction; exercise

The Journal of Applied Physiology 84(2):442-449
8750-7587/98 $5.00 Copyright © 1998 the American Physiological Society


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