Journal of Applied Physiology
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J Appl Physiol (November 9, 2001). doi:10.1152/japplphysiol.00884.2001
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Articles in PresS, published online ahead of print November 9, 2001
J Appl Physiol, 10.1152/jap.00884.2001
Submitted on August 27, 2001
Accepted on November 5, 2001

Activation of human plantar flexor muscles increases after electromyostimulation training

Nicola A. Maffiuletti1*, Manuela Pensini1, and Alain Martin1

1 UFR STAPS Faculty of Sport Science, Groupe Analyse du Mouvement, Dijon, France

* To whom correspondence should be addressed. E-mail: Nicola.Maffiuletti{at}u-bourgogne.fr.

Neuromuscular adaptations of the plantar flexor muscles were assessed prior and subsequent to short-term electromyostimulation (EMS) training. Eight subjects underwent 16 sessions of isometric EMS training over 4 weeks. Surface EMG and torque obtained under maximal voluntary and electrically evoked contractions were analysed to distinguish neural adaptations from contractile changes. After training, plantar flexor voluntary torque significantly increased under isometric conditions at the training angle (+8.1%, P < 0.05) and at the two eccentric velocities considered (+10.8% and +13.1%, P < 0.05). Torque gains were accompanied by higher normalized soleus EMG activity, and in the case of eccentric contractions also by higher gastrocnemii EMG (P < 0.05). There was an 11.9% significant increase in both plantar flexor maximal voluntary activation (P < 0.01) and post-activation potentiation (P < 0.05), whereas contractile properties did not change following training. In the absence of a change in the control group, it was concluded that an increase in neural activation likely mediates the voluntary torque gains observed after short term EMS training.




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