Frequency for re-ed?

• A. 5-15 Hz
• B. 30-80 Hz
• C. 60-90 Hz
• D. 100-150 Hz

Answer: (B)

For neuromuscular re-education, you want a frequency that produces a smooth, sustained contraction so the nervous system can practice and relearn normal motor patterns. Lower frequencies around 5–15 Hz create distinct twitches rather than a fused, tetanic contraction, which isn’t ideal for motor relearning. Very high frequencies like 60–90 Hz can generate strong contractions but tend to fatigue the muscle quickly and may be less tolerable. A frequency in the 30–80 Hz range strikes the right balance: it yields a fused, tetanic contraction that supports functional practice while keeping fatigue manageable. Frequencies far outside this range, such as 100–150 Hz, don’t provide added benefit and increase discomfort and fatigue. So, 30–80 Hz is the best general range for re-education.