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It has been proposed that superior muscle hypertrophy may be obtained by training muscles predominant in type I fibers with lighter loads and those predominant in type II fibers with heavier loads.

To evaluate longitudinal changes in muscle strength and hypertrophy of the soleus (a predominantly slow‐twitch muscle) and gastrocnemius (muscle with a similar composition of slow and fast‐twitch fibers) when subjected to light (20–30 repetition maximum) and heavy (6–10 repetition maximum) load plantarflexion exercise.

The study employed a within‐subject design whereby 26 untrained young men had their lower limbs randomized to perform plantarflexion with a low‐load (LIGHT) and a high‐load (HEAVY) for 8 weeks. Muscle thickness was estimated via B‐mode ultrasound and maximal strength was determined by isometric dynamometry.

Results showed that changes in muscle …