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Work‐induced hypertrophy in exercised normal muscles of different ages and the reversibility of hypertrophy after cessation of exercise

1. Groups of male hamsters of different ages were subjected to a weight‐lifting exercise regimen, and the biceps brachii, soleus and extensor digitorum longus (EDL) muscles examined for structural changes occurring in response to the increased workload. In addition, two groups of adult hamsters were left to recover from the exercise stimulus for 5 and 15 weeks respectively.