Adaptation of mechanical properties of muscle to high force training in man.

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Abstract
The 1st dorsal interosseus muscle of the hand was trained for 8 wk using 80 maximal 10 s voluntary isometric contractions per day. As a result of this training the maximal voluntary force increased by 33% , but electrically evoked tetanic tension increased by only 11%. In other subjects the muscle was trained using electrical stimulation at 60 Hz to evoke 80 maximal 10 s tetani/day for 8 wk. This training produced no increase in maximum voluntary force. The increase in maximal voluntary force under these conditions may be due to a change in the voluntary neural drive to the muscle.