The oxygen consumption of isolated frog sartorius muscles was measured in a moist chamber at 12°C. The muscles were indirectly stimulated to perform 2 series of contractions: in the first of these the imposed loads re extended the muscles in relaxation, whereas in the second series relaxation occurred without the external load. No difference in oxygen consumption was detected between the 2 series of experiments. In both, lightly loaded contractions resulted in less oxygen uptake than isometric contractions at the resting length and heavily loaded contractions resulted in a greater consumption than in the isometric case. It is concluded that, within the limitations of the technique used, there is no additional oxygen consumption associated with the persistence of tension in a muscle during relaxation.
ASJC Scopus subject areas
- Physiology (medical)