The correct solution is 3.
RATIONALE: To minimize muscle fatigue, the initial on:off time ratio should be 1:5. As the muscle strengthens, the ratio may be altered to 1:4 or 1:3.
The correct solution is 3.
RATIONALE: To minimize muscle fatigue, the initial on:off time ratio should be 1:5. As the muscle strengthens, the ratio may be altered to 1:4 or 1:3.