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Assessment of Neuromuscular Function Using Percutaneous Electrical Nerve Stimulation
Published on: September 13, 2015
A gender comparison of central and peripheral neuromuscular function after exercise
Ashley Stern1, Chris Kuenze, Daniel Herman
1Dept of Human Services, University of Virginia, Charlottesville, VA, USA.
Journal of Sport Rehabilitation
|January 12, 2012
Summary
Males showed greater peripheral muscle fatigue, while females experienced more central neuromuscular changes after exercise. This suggests females may have an increased risk of knee injury due to reduced quadriceps neural drive.
Area of Science:
- Neuromuscular Physiology
- Sports Medicine
- Biomechanics
Background:
- Muscle fatigue during exercise can worsen neuromuscular factors linked to noncontact anterior cruciate ligament (ACL) injuries.
- Understanding sex-based differences in neuromuscular responses to exercise is crucial for injury prevention.
Purpose of the Study:
- To compare changes in lower extremity motor-evoked potentials (MEPs), muscle strength, and electromyography (EMG) activation between males and females after a standardized exercise protocol.
- Investigate sex-specific neuromuscular fatigue patterns following exercise.
Main Methods:
- A pretest-posttest comparison of 34 healthy university students (17 males, 17 females).
- Participants underwent a 30-minute exercise protocol including walking, squatting, and step-ups.
- Measured quadriceps and hamstring MEP amplitude and velocity, and EMG activation (% MVIC) and peak torque (Nm/kg) during maximal voluntary contractions (MVICs).
Main Results:
- Males exhibited greater baseline knee-extension torque and hamstring MEP amplitude compared to females.
- Following exercise, males showed greater quadriceps MEP amplitude than females.
- Both sexes demonstrated neuromuscular changes, but with distinct patterns of central and peripheral fatigue.
Conclusions:
- Males experienced more pronounced peripheral neuromuscular fatigue (reduced quadriceps torque).
- Females exhibited greater central neuromuscular changes (reduced quadriceps MEP amplitude).
- The findings suggest that reduced central neural drive in females, combined with preserved knee-extension torque post-exercise, may elevate their risk for knee injuries.
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