Utilize este identificador para referenciar este registo: http://hdl.handle.net/10198/6982
Título: Changes in H reflex and V wave following short-term endurance and strength training
Autor: Vila-Chã, Carolina
Falla, Deborah
Correia, M.V.
Farina, Dario
Palavras-chave: Electromiografia
Neurofisiologia
Treino de endurance
Treino de força
Data: 2012
Editora: Amer Physiological Soc
Citação: Vila-Cha, Carolina; Falla, D.; Correia, M. V.; Farina, D. (2012) – Changes in H reflex and V wave following short-term endurance and strength training. Journal of Applied Physiology. ISSN 8750-7587. 112:1, p. 54-63
Resumo: This study examined the effects of 3 wk of either endurance or strength training on plasticity of the neural mechanisms involved in the soleus H reflex and V wave. Twenty-five sedentary healthy subjects were randomized into an endurance group (n 13) or strength group (n 12). Evoked V-wave, H-reflex, and M-wave recruitment curves, maximal voluntary contraction (MVC), and time-to-task-failure (isometric contraction at 40% MVC) of the plantar flexors were recorded before and after training. Following strength training, MVC of the plantar flexors increased by 14.4 5.2% in the strength group (P 0.001), whereas time-to-task-failure was prolonged in the endurance group (22.7 17.1%; P 0.05). The V wave-to-maximal M wave (V/Mmax) ratio increased significantly (55.1 28.3%; P 0.001) following strength training, but the maximal H wave-to-maximal M wave (Hmax/Mmax) ratio remained unchanged. Conversely, in the endurance group the V/Mmax ratio was not altered, whereas the Hmax/Mmax ratio increased by 30.8 21.7% (P 0.05). The endurance training group also displayed a reduction in the H-reflex excitability threshold while the H-reflex amplitude on the ascending limb of the recruitment curve increased. Strength training only elicited a significant decrease in H-reflex excitability threshold, while H-reflex amplitudes over the ascending limb remained unchanged. These observations indicate that the H-reflex pathway is strongly involved in the enhanced endurance resistance that occurs following endurance training. On the contrary, the improvements in MVC following strength training are likely attributed to increased descending drive and/or modulation in afferents other than Ia afferents.
URI: http://hdl.handle.net/10198/6982
ISSN: 8750-7587
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