Abstract
Groups of male hamsters of different ages were subjected to a weightlifting exercise regimen of five weeks duration. Transverse fresh frozen sections from the biceps brachii, soleus and extensor digitorum longus (EDL) muscles were incubated for succinic dehydrogenase (SDH) activity. The amounts of Nitro BT diformazan deposited in individual muscle fibres were estimated cytophotometrically using the two-wavelength method and the results obtained were compared with those found for control muscles. In all the muscles, the exercise stimulus caused an increase in SDH activity. In the biceps brachii, the increase was greatest in the young (9 week) muscles, whereas the greatest increase in the soleus and EDL occurred at 13–19 weeks of age. In the old (65 week) control muscles, the SDH activity of the fibres decreased, but the old muscles were still capable of response to the exercise stimulus.
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