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Wide-pulse-high-frequency neuromuscular electrical stimulation in cerebral palsy

Abstract : OBJECTIVE: The present study assesses whether wide-pulse-high-frequency (WPHF) neuromuscular electrical stimulation (NMES) could result in extra-force production in cerebral palsy (CP) patients as previously observed in healthy individuals. METHODS: Ten CP and 10 age- and sex-matched control participants underwent plantar flexors NMES. Two to three 10-s WPHF (frequency: 100Hz, pulse duration: 1ms) and conventional (CONV, frequency 25Hz, pulse duration: 50μs) trains as well as two to three burst-like stimulation trains (2s at 25Hz, 2s at 100Hz, 2s at 25Hz; pulse duration: 1ms) were evoked. Resting soleus and gastrocnemii maximal H-reflex amplitude (Hmax) was normalized by maximal M-wave amplitude (Mmax) to quantify α-motoneuron modulation. RESULTS: Similar Hmax/Mmax ratio was found in CP and control participants. Extra-force generation was observed both in CP (+18±74%) and control individuals (+94±124%) during WPHF (p\textless0.05). Similar extra-forces were found during burst-like stimulations in both groups (+108±110% in CP and +65±85% in controls, p\textgreater0.05). CONCLUSION: Although the mechanisms underlying extra-force production may differ between WPHF and burst-like NMES, similar increases were observed in patients with CP and healthy controls. SIGNIFICANCE: Development of extra-forces in response to WPHF NMES evoked at low stimulation intensity might open new possibilities in neuromuscular rehabilitation.
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https://hal-amu.archives-ouvertes.fr/hal-01425527
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Submitted on : Tuesday, January 3, 2017 - 3:56:35 PM
Last modification on : Wednesday, November 3, 2021 - 5:51:56 AM

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D. Neyroud, S. Armand, G. de Coulon, S. R. D. da Silva, J. Wegrzyk, et al.. Wide-pulse-high-frequency neuromuscular electrical stimulation in cerebral palsy. Clinical Neurophysiology, Elsevier, 2016, 127 (2), pp.1530--1539. ⟨10.1016/j.clinph.2015.07.009⟩. ⟨hal-01425527⟩

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