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- Title
Late neural adaptations to electrostimulation resistance training of the plantar flexor muscles.
- Authors
Jubeau, Marc; Zory, Raphaël; Gondin, Julien; Martin, Alain; Maffiuletti, Nicola A.; Zory, Raphaël
- Abstract
The present study aimed to examine early and late neural adaptations to short-term electrostimulation training of the plantar flexor muscles. Changes in triceps surae muscle activation (twitch interpolation), maximal electromyographic (EMG) activity, H-reflex amplitudes and antagonist coactivation were investigated after electrostimulation training (4 weeks) and after 4 weeks of detraining in a group of ten young healthy men. Maximal voluntary contraction torque was significantly higher (P < 0.01) after training (+19.4%) and detraining (+17.2%) with respect to baseline. Activation level, soleus and lateral gastrocnemius EMG normalized to the maximal M-wave significantly increased as a result of training (P < 0.05), and these gains were preserved after detraining, excepted for soleus EMG. Maximal H reflex to maximal M wave ratio increased significantly between baseline and detraining for both soleus and lateral gastrocnemius muscles (P < 0.05). Tibialis anterior coactivation was unchanged after training but significantly decreased after the detraining period (P < 0.01). Short-term electrostimulation resistance training was accompanied by early (increased muscle activation and EMG activity) and late neural adaptations (increased spinal reflex amplitude and decreased coactivation), likely explaining the increase and then the preservation of the maximal voluntary strength. These effects may help in conceiving and programming effective electrostimulation therapy programs for both healthy and immobilized plantar flexor muscles.
- Subjects
NEURAL stimulation; ELECTROPHYSIOLOGY; ELECTRODIAGNOSIS; ELECTRIC stimulation; MUSCLE diseases; THERAPEUTICS; ANKLE physiology; SKELETAL muscle physiology; ABNORMAL reflexes; PHYSIOLOGICAL adaptation; COMPARATIVE studies; EXERCISE; RESEARCH methodology; MEDICAL cooperation; MUSCLE contraction; NEUROPLASTICITY; PHYSICAL fitness; RESEARCH; EVALUATION research; SKELETAL muscle; INNERVATION
- Publication
European Journal of Applied Physiology, 2006, Vol 98, Issue 2, p202
- ISSN
1439-6319
- Publication type
journal article
- DOI
10.1007/s00421-006-0264-z