Which statement best describes typical NMES characteristics?

Which statement best describes typical NMES characteristics?

• A. High intensity with substantial patient discomfort using monophasic currents
• B. Moderate intensity with relatively little patient discomfort using biphasic currents with a duty cycle
• C. Low intensity with no muscle contraction using direct current
• D. Very long duty cycle with continuous contraction using alternating current

Answer: (B)

NMES works best when it delivers muscle contractions with comfort and control. Using biphasic pulses means the current reverses direction each pulse, which reduces net charge buildup and minimizes skin irritation, making the sensation more tolerable for the patient. A moderate intensity is enough to produce a visible, tetanic contraction without causing excessive discomfort, supporting better patient tolerance and repeated sessions. The duty cycle—having an on-time followed by an off-time—provides rest between contractions, reducing fatigue and allowing recovery, which is essential for sustainable activation and gradual strength gains. In contrast, monophasic currents tend to cause more skin irritation and polarity effects, direct current risks tissue damage and poor recruitment, and a very long duty cycle with continuous contraction would fatigue the muscle quickly.

NMES works best when it delivers muscle contractions with comfort and control. Using biphasic pulses means the current reverses direction each pulse, which reduces net charge buildup and minimizes skin irritation, making the sensation more tolerable for the patient. A moderate intensity is enough to produce a visible, tetanic contraction without causing excessive discomfort, supporting better patient tolerance and repeated sessions. The duty cycle—having an on-time followed by an off-time—provides rest between contractions, reducing fatigue and allowing recovery, which is essential for sustainable activation and gradual strength gains. In contrast, monophasic currents tend to cause more skin irritation and polarity effects, direct current risks tissue damage and poor recruitment, and a very long duty cycle with continuous contraction would fatigue the muscle quickly.