Effect of burst-modulated alternating current carrier frequency on current amplitude required to produce maximally tolerated electrically stimulated quadriceps femoris knee extension torque

American Journal of Physical Medicine & Rehabilitation
David M SelkowitzShawn Fitzpatrick

Abstract

To investigate the effects of medium frequency burst-modulated alternating current on the current amplitude necessary to produce maximally tolerated electrically stimulated quadriceps femoris isometric knee extension torque. Ten healthy volunteers participated in this study. Neuromuscular electrical stimulation was applied to the quadriceps femoris at two different carrier frequencies: 2500 and 5000 Hz. All subjects received both frequencies in a random order. Maximum voluntary isometric contraction torque of knee extension was measured. The current amplitude (in milliamperes) required to produce maximally tolerated isometric contraction knee extension torque at both carrier frequencies was recorded. The mean maximally tolerated isometric contraction torque (in %maximum voluntary isometric contraction) was 37.6% (SD, +/-20.9) for 2500 Hz and 37.2% (SD, +/-20.9) for 5000 Hz. These values were not significantly different (P = 0.944). However, the mean current amplitude required to produce maximally tolerated isometric contraction torque with 2500 Hz was 91.9 (SD, +/-23.1) mA and with 5000 Hz it was 167.4 (SD, +/-34.5) mA (P < 0.001). A carrier frequency of 2500 Hz is nearly twice as efficient for generating quadriceps femoris kne...Continue Reading

References

Jan 1, 1981·Journal of Biomechanics·J Moreno-Aranda, A Seireg
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Oct 4, 2003·The Journal of Orthopaedic and Sports Physical Therapy·G Kelley FitzgeraldJames J Irrgang
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Citations

Aug 14, 2013·Physiotherapy Theory and Practice·James W BellewMatt Barton
Dec 6, 2011·Physiotherapy Theory and Practice·James W BellewJane Trafton
Jun 25, 2015·The Journal of Orthopaedic and Sports Physical Therapy·Donald H LeinC Scott Bickel
Sep 30, 2016·American Journal of Physical Medicine & Rehabilitation·Flávia Vanessa MedeirosJoão Luiz Quagliotti Durigan
May 22, 2010·American Journal of Physical Medicine & Rehabilitation·Yocheved Laufer, Lynn Snyder-Mackler

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