Technologies de rééducation
Le 14/10/2021 de 16:30 à 18:00
La stimulation transcrânienne à courant continu améliore la force des membres inférieurs
Stephen Bornheim (Liege, Belgique), Jean-François Kaux (Liège, Belgique), Jean-Louis Croisier (Liège, Belgique)
Objectif : Few articles have analyzed the effects of tDCS on muscle performance. None have looked at the differences between concentric and eccentric contractions, nor at the difference between dominant and non-dominant legs.
Matériel/Patients et méthodes : Forty healthy male subjects (24 ± 3 years) were randomly allocated to one of four groups: tDCS and dominant (n=10) and non-dominant leg (n=10) tested, sham and dominant leg (n=10) and non-dominant leg (n=10) tested. The study was controlled and double-blinded. Each subject underwent a familiarization session, and an evaluation session, during which they underwent the maximal isokinetic strength evaluation of their hamstrings and quadriceps. There was a 10-minute rest period followed by 20 minutes, 2mA of anodal or sham stimulation of their lower limbs’ primary motor cortex. The maximal isokinetic strength assessment was repeated after the end of the stimulation.
Résultats : Strength increased for both active groups (tDCS) by 21,1% (± 18,7) for the dominant leg and 23,9% (± 16,1) for the non-dominant leg. Overall strength decreased for the placebo legs (dominant limb: -18,9% (± 13,3) and non-dominant limb: -20,3% (± 12,6)). There seems to be a cumulative effect of increasing strength and reducing fatigue after tDCS. Originally, increases were significantly higher in eccentric contractions than in concentric contractions in hamstrings and were significantly higher in the non-dominant leg.
Discussion - Conclusion : A single session of tDCS immediately and significantly increases strength in both dominant and non-dominant limbs. This increase in leg strength may possibly have an impact on sports performances or in the rehabilitation of certain pathologies
Mots clés : tDCS, lower limb, isokinetic, concentric, eccentric
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