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Augmenting Voluntary Torque of Healthy Muscle by Optimization of Electrical Stimulation

C-L Soo, MS, is Staff Physical Therapist, American Physical Therapy Group, 152 W Zandale Dr, Lexington, KY 50403. He was a graduate student, University of Kentucky, at the time this study was conducted.
D. Currier, PhD, is Professor and Chairman, Department of Physical Therapy, University of Kentucky Medical Center, Annex 1, Lexington, KY 40536-0079 (USA).
A. Threlkeld, PhD, is Assistant Professor, Department of Physical Therapy, University of Kentucky Medical Center.

The purpose of this study was to evaluate the ability of electrical stimulation (2,500-Hz sine waves, interrupted for 50 pulsed bursts per second) to improve muscle torque using low-dosage training characteristics. Fifteen healthy subjects (9 men, 6 women), 20 to 32 years of age, participated in the experiment. All subjects received electrical stimulation of the right anterior thigh musculature while their left leg served as the control. Electrical stimulation was repeated eight times per session, each stimulation producing isometric torque equal to 50% of the subject's maximum voluntary isometric contraction. The sessions were repeated twice a week over a period of five weeks. Results showed that electrical stimulation, when used with the specified low-dosage training characteristics of this study, will augment quadriceps femoris muscle torque of men.

Key Words: Electrotherapy, electric stimulation • Exercise, strengthening • Physical therapy

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