What duty cycle would you use to treat a muscle spasm?

What duty cycle would you use to treat a muscle spasm?

• A. 1:3
• B. 2:1
• C. 1:1
• D. 3:1

Answer: (C)

Duty cycle is about how long the stimulus is on versus off in each cycle, which directly affects how much energy is delivered and how much fatigue the muscle experiences. For a muscle in spasm, you want enough stimulus to interrupt the involuntary contraction but not so much that the muscle fatigues or overheats. An equal duration of on and off time provides a balanced approach: it delivers a meaningful cue to help reduce the spasm while allowing the muscle to recover during the rest period. If the on-time is too long, fatigue and discomfort can worsen or prolong the spasm; if the on-time is too short, the stimulus may not effectively disrupt the spasm. So using an equal on/off pattern optimizes relaxation and prevents fatigue, which is why it’s the best choice.

Duty cycle is about how long the stimulus is on versus off in each cycle, which directly affects how much energy is delivered and how much fatigue the muscle experiences. For a muscle in spasm, you want enough stimulus to interrupt the involuntary contraction but not so much that the muscle fatigues or overheats. An equal duration of on and off time provides a balanced approach: it delivers a meaningful cue to help reduce the spasm while allowing the muscle to recover during the rest period. If the on-time is too long, fatigue and discomfort can worsen or prolong the spasm; if the on-time is too short, the stimulus may not effectively disrupt the spasm. So using an equal on/off pattern optimizes relaxation and prevents fatigue, which is why it’s the best choice.