Abstract
Purpose
No studies have evaluated the potential benefits of wide-pulse high-frequency (WPHF) neuromuscular electrical stimulation (NMES) despite it being an interesting alternative to conventional NMES. Hence, this study evaluated neuromuscular adaptations induced by 3 weeks of WPHF NMES.
Methods
Ten young healthy individuals (training group) completed nine sessions of WPHF NMES training spread over 3 weeks, whereas seven individuals (control group) only performed the first and last sessions. Plantar flexor neuromuscular function (maximal voluntary contraction (MVC) force, voluntary activation level, H reflex, V wave, contractile properties) was evaluated before the first and last training sessions. Each training session consisted of ten 20-s WPHF NMES contractions (pulse duration: 1 ms, stimulation frequency: 100 Hz) interspaced by 40 s of recovery and delivered at an intensity set to initially evoke ~ 5% of MVC force. The averaged mean evoked forces produced during the ten WPHF NMES-evoked contractions of a given session as well as the sum of the ten contractions force time integral (total FTI) were computed.
Results
Total FTI (+ 118 ± 98%) and averaged mean evoked forces (+ 96 ± 91%) increased following the 3-week intervention (p < 0.05); no changes were observed in the control group. The intervention did not induce any change (p > 0.05) in parameters used to characterize plantar flexor neuromuscular function.
Conclusion
Three weeks of WPHF NMES increased electrically evoked forces but induced no other changes in plantar flexor neuromuscular properties. Before introducing WPHF NMES clinically, optimal training program characteristics (such as frequency, duration and intensity) remain to be identified.
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Data availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- AQAP:
-
Physical activity auto-questionnaire
- EMG:
-
Electromyography
- EMGmax :
-
Maximal electromyography activity recorded during a maximal voluntary contraction
- FTI:
-
Force time integral
- H max :
-
Maximal H-reflex amplitude
- I Hmax :
-
Stimulation intensity required to evoke the maximal soleus H-reflex amplitude
- I Mmax :
-
Stimulation intensity required to evoke maximal M-wave amplitude
- IWPHF :
-
Stimulation intensity necessary to evoke a force corresponding to 5% of MVC force
- M max :
-
Maximal M-wave amplitude
- M sup :
-
Superimposed M-wave peak-to-peak amplitude
- MVC:
-
Maximal voluntary contraction
- NMES:
-
Neuromuscular electrical stimulation
- PS10:
-
Supramaximal 10-Hz paired stimulation
- PS100:
-
Supramaximal 100-Hz paired stimulation
- RMSmax :
-
Maximal root mean square
- SS:
-
Single stimulation
- V/M sup :
-
Ratio between V-wave and superimposed M-wave peak-to-peak amplitudes
- VAL:
-
Voluntary activation level
- WPHF:
-
Wide-pulse high frequency
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Acknowledgements
We thank all the participants who took part in the experiments and Dr. Julien Gondin for his helpful comments on the manuscript.
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The present work was supported by internal institutional funds.
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DN and NP conceived and designed the experiment. DN, MG, SM, DA and NP conducted experiments. DN, MG, SM and DA took part in data analysis. All authors were involved in data interpretation. DN wrote the manuscript. All authors read and approved the manuscript.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Communicated by Philip D Chilibeck.
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Neyroud, D., Gonzalez, M., Mueller, S. et al. Neuromuscular adaptations to wide-pulse high-frequency neuromuscular electrical stimulation training. Eur J Appl Physiol 119, 1105–1116 (2019). https://doi.org/10.1007/s00421-019-04100-1
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DOI: https://doi.org/10.1007/s00421-019-04100-1