Exercise-induced catabolic responses in various muscle fibres.


In Wistar rats a 10-hr swim caused an immediate increase of 3-methylhistidine and free tyrosine content in the white portion of quadriceps muscle. In the red portion the elevated levels of these amino acids were observed within 6 to 48 hrs of postexercise recovery. The glycogen depletion was substantially higher in the red portion of the muscle, indicating that the most active were oxidative-glycolytic fibres during the exercise. In conclusion, during exercise the most active muscle fibres do not contribute to the mobilization of protein resources. In a later part of postexercise recovery, catabolic changes occur in most active fibres, constituting, reasonably, a part of enhanced protein turnover.

Cite this paper

@article{Varrik1992ExerciseinducedCR, title={Exercise-induced catabolic responses in various muscle fibres.}, author={E V Varrik and A. A. Viru and Vahur O{\"{o}pik and Mehis Viru}, journal={Canadian journal of sport sciences = Journal canadien des sciences du sport}, year={1992}, volume={17 2}, pages={125-8} }