Which statement about NMES frequency is NOT true?

Which statement about NMES frequency is NOT true?

• A. Fatigue increases with higher frequency
• B. Force increases with higher frequency
• C. There is no effect on fatigue with frequency
• D. Interpulse interval shortens with higher frequency

Answer: (C)

Frequency in NMES controls how often pulses are delivered each second. When you raise the frequency, pulses arrive more quickly, producing greater temporal summation and a stronger, more tetanic contraction. But this tighter pacing also means the muscle works harder with less time to recover between shocks, speeding up metabolic fatigue. So, increasing frequency tends to increase fatigue rather than leaving fatigue unchanged. The interpulse interval is simply the time between pulses, which shortens as frequency increases (higher frequency means shorter intervals). Therefore, the statement that there is no effect on fatigue with frequency is not true. The other relationships hold: higher frequency increases force, and higher frequency shortens the interval between pulses.

Frequency in NMES controls how often pulses are delivered each second. When you raise the frequency, pulses arrive more quickly, producing greater temporal summation and a stronger, more tetanic contraction. But this tighter pacing also means the muscle works harder with less time to recover between shocks, speeding up metabolic fatigue. So, increasing frequency tends to increase fatigue rather than leaving fatigue unchanged. The interpulse interval is simply the time between pulses, which shortens as frequency increases (higher frequency means shorter intervals). Therefore, the statement that there is no effect on fatigue with frequency is not true. The other relationships hold: higher frequency increases force, and higher frequency shortens the interval between pulses.