Abstract:
STUDY DESIGN:Intervention study. OBJECTIVES:The present study aimed at examining whether spinal and/or peripheral alterations are in the origin of neuromuscular fatigue development induced by intermittent neuromuscular electrical stimulation (NMES) in subjects with complete spinal cord injury (SCI). SETTING:Neurological Rehabilitation Center CMN Propara, Montpellier, France. METHODS:Thirteen volunteers with complete SCI participated in the study. The right triceps surae muscle was fatigued using a 30-Hz NMES protocol (2 s ON-2 s OFF) composed of three series of five trains. Spinal excitability (assessed by the H-reflex), muscle excitability (assessed by the M-wave), muscle contractile properties (assessed by mechanical response parameters) and torque evoked by NMES were tested before and after each five-train series. RESULTS:NMES-evoked torque significantly decreased throughout the protocol (P<0.001). This decrease was accompanied by a significant increase in M-wave amplitude (P<0.001), whereas H-reflex and the Hmax/Mmax ratio were not significantly modified. The amplitude of the mechanical response was significantly decreased at the end of the protocol (P<0.05). CONCLUSION:The results indicate significant fatigue development, which was attributed to impaired cross-bridge force-generating capacity, without modification of spinal excitability nor muscle excitability.
journal_name
Spinal Cordjournal_title
Spinal cordauthors
Papaiordanidou M,Varray A,Fattal C,Guiraud Ddoi
10.1038/sc.2013.172subject
Has Abstractpub_date
2014-03-01 00:00:00pages
246-50issue
3eissn
1362-4393issn
1476-5624pii
sc2013172journal_volume
52pub_type
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