title: Recovery pattern of motor reflex after a single bout of neuromuscular electrical stimulation session.
abstract: We aimed at determining the recovery pattern of neural properties of soleus muscle after a single bout of neuromuscular electrical stimulation (NMES) session. Thirteen subjects performed an NMES exercise (75 Hz, 40 contractions, 6.25 s per contraction). Maximal voluntary contraction (MVC), H-reflex at rest and during voluntary contraction fixed at 60% of MVC (respectively, H(max) and H(sup) ) and volitional (V) wave were measured before and during the recovery period following this exercise [i.e., immediately after, 2 h (H2), 2 days (D2) and 7 days (D7)]. MVC exhibited an immediate and a delayed declines at 2 days (respectively, -29.8±4.6%, P<0.001; -13.0±3.4%, P<0.05). Likewise, V/M(sup) was decreased immediately and 2 days after NMES session (respectively, -43.3±11.6%, P<0.05; 35.3±6.6%, P<0.05). The delayed decrements in MVC and V-wave occurred concomitantly with muscle soreness peak (P<0.001). It could be concluded that motor command alterations after an NMES resistance session contributed to the immediate and also to the delayed decreases in MVC without affecting resting and active H-reflex excitability. These results suggested that spinal circuitry function of larger motoneurons was inhibited by NMES (as indicated by the depressed V-wave responses) contrary to the smaller one (indicated by the unchanged H-reflex responses).
authors.affiliation: UMR CNRS 6233, Institut des Sciences du Mouvement (ISM), Parc Scientifique et Technologique de Luminy, Faculté des Sciences du Sport de Marseille, Etienne-Jules MAREY, Université de la Méditerranée (Aix-Marseille II) - Aix-Marseille Université, Cedex, France.
authors.forename: J
authors.initials: J
authors.lastname: Laurin
authors.forename: E
authors.initials: E
authors.lastname: Dousset
authors.forename: R
authors.initials: R
authors.lastname: Carrivale
authors.forename: L
authors.initials: L
authors.lastname: Grélot
authors.forename: P
authors.initials: P
authors.lastname: Decherchi
mesh_terms: D000328:Adult; D004558:Electric Stimulation; D004576:Electromyography; D006181:H-Reflex / Q000502:physiology*; D006801:Humans; D009119:Muscle Contraction / Q000502:physiology; D018763:Muscle Fatigue / Q000502:physiology; D018482:Muscle, Skeletal / Q000294:innervation / Q000502:physiology*; D020127:Recovery of Function / Q000502:physiology*; D012018:Reflex / Q000502:physiology; D012021:Reflex, Abnormal / Q000502:physiology*; D055815:Young Adult