The effect of duty cycle and frequency on muscle torque production using kilohertz frequency range alternating current.

@article{Ward2004TheEO,
  title={The effect of duty cycle and frequency on muscle torque production using kilohertz frequency range alternating current.},
  author={Alex R Ward and Valma J Robertson and Harry Ioannou},
  journal={Medical engineering & physics},
  year={2004},
  volume={26 7},
  pages={569-79}
}
We investigated the frequency and duty cycle dependence of maximal electrically induced torque (MEIT) of the wrist extensors. Fifty hertz burst modulated sinusoidal alternating current (AC) in the frequency range 0.5-20 kHz was used, with duty cycles ranging from a minimum (one cycle) to maximum (continuous AC). MEITs were similar at low frequencies but decreased markedly above 2.5 kHz. MEITs also decreased markedly above a 20% duty cycle. Subjective reports of discomfort were fewest at 4 kHz… CONTINUE READING

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