AI Article Synopsis
- WPHF NMES is effective in generating extra force through reflexive recruitment of motor units, but effects vary between muscle groups.
- Plantar flexors produced greater extra force and sustained EMG activity compared to elbow flexors across most tested parameters, indicating their responsiveness to NMES.
- Inter-muscle differences in extra force and EMG activity may be influenced by factors like peripheral nerve structure and muscle function, suggesting NMES is particularly beneficial for lower limb muscles.
Article Abstract
Wide-pulse high-frequency neuromuscular electrical stimulation (WPHF NMES) can generate a progressive increase in tetanic force through reflexive recruitment of motor units, called extra force. This phenomenon has previously been observed on different muscle groups, but little is known on potential inter-muscle differences. We compared extra force and sustained electromyographic (EMG) activity induced by NMES between plantar flexors, knee extensors, elbow flexors and within muscle groups using pulse durations of 0.2, 1 and 2 ms and stimulation frequencies of 20, 50, 100 and 147 Hz. Extra force production and sustained EMG activity were higher for plantar flexors compared to elbow flexors at all tested parameters (except 0.2 ms for extra force). When compared to elbow flexors, extra force of the knee extensors was only higher at 100 Hz and with 1 ms while sustained EMG activity was higher at all frequencies with pulse durations of 0.2 and 2 ms. Peripheral nerve architecture as well as muscle typology and function could influence the occurrence and magnitude of centrally-mediated responses to NMES. The present findings suggest that the use of wide-pulse high-frequency NMES to promote reflexive recruitment seems to be more pertinent for lower limb muscles, plantar flexors in particular.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11496505 | PMC |
| http://dx.doi.org/10.1038/s41598-024-75145-2 | DOI Listing |
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