The role of pulse duration and stimulation duration in maximizing the normalized torque during neuromuscular electrical stimulation.
METHODS
Controlled laboratory study


OBJECTIVE
To determine the effects of pulse duration and stimulation duration on the evoked torque after controlling for the activated area by using magnetic resonance imaging (MRI).


BACKGROUND
Neuromuscular electrical stimulation (NMES) is commonly used in the clinic without considering the physiological implications of its parameters.


METHODS
Seven able-bodied, college students (mean +/- SD age, 28 +/- 4 years) participated in this study. Two NMES protocols were applied to the knee extensor muscle group in a random order. Protocol A applied 100-Hz, 450-microsecond pulses for 5 minutes in a 3-seconds-on 3-seconds-off duty cycle. Protocol B applied 60-Hz, 250-microsecond pulses for 5 minutes in a 10-seconds-on 20-seconds-off duty cycle. The amplitude of the current was similar in both protocols. Torque, torque time integral, and normalized torque for the knee extensors were measured for both protocols. MRI scans were taken prior to, and immediately after, each protocol to measure the cross-sectional area of the stimulated muscle.


RESULTS
The skeletal muscle cross-sectional areas activated after both protocols were similar. The longer pulse duration in protocol A elicited 22% greater torque output than that of protocol B (P<.05). After considering the activated area in both protocols, the normalized torque with protocol A was 38% greater than that with protocol B (P<.05). Torque time integral was 21% greater with protocol A (P = .029). Protocol B failed to maintain torque at the start and the end of the 10-second activation.


CONCLUSIONS
Longer pulse duration, but not stimulation duration, resulted in a greater evoked and normalized torque compared to the shorter pulse duration, even after controlling for the activated muscular cross-sectional areas with both protocols.


METHODS
Therapy, level 5.
Gorgey
Ashraf S
AS
Department of Physical Therapy, Indiana University, Indianapolis, IN 46202-5119, USA. agorgey@gmail.com
Dudley
Gary A
GA
D000328:Adult; D004599:Electric Stimulation Therapy / Q000379:methods*; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000503:physiopathology*; D008279:Magnetic Resonance Imaging; D008297:Male; D053581:Muscle Strength Dynamometer; D018908:Muscle Weakness; D009133:Muscular Atrophy / Q000628:therapy; D019415:Torque; D055815:Young Adult