Effects of ischemic conditioning on maximal voluntary plantar flexion contractions.

Autor: Cruz RSO; Human Performance Laboratory, São Paulo State University, Rio Claro, Brazil; Human Performance Research Group, Santa Catarina State University, Florianópolis, Brazil. Electronic address: cruz.rso@gmail.com., Pereira KL; Human Performance Research Group, Santa Catarina State University, Florianópolis, Brazil., de Aguiar RA; Human Performance Research Group, Santa Catarina State University, Florianópolis, Brazil., Turnes T; Human Performance Research Group, Santa Catarina State University, Florianópolis, Brazil; Physical Effort Laboratory, Federal University of Santa Catarina, Florianópolis, Brazil., Denadai BS; Human Performance Laboratory, São Paulo State University, Rio Claro, Brazil; Physical Effort Laboratory, Federal University of Santa Catarina, Florianópolis, Brazil., Caputo F; Human Performance Research Group, Santa Catarina State University, Florianópolis, Brazil.
Jazyk: angličtina
Zdroj: Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology [J Electromyogr Kinesiol] 2019 Oct; Vol. 48, pp. 37-43. Date of Electronic Publication: 2019 Jun 13.
DOI: 10.1016/j.jelekin.2019.06.004
Abstrakt: Intermittent blood flow restriction to local or remote vascular beds induces endogenous protection against ischemia-reperfusion injury in several tissues and organs. When applied non-invasively by placing occlusion cuffs on the limbs, this ischemic conditioning has been shown to elicit an acute ergogenic response. However, the underlying mechanisms behind this phenomenon remain unknown. Prior research suggest that ischemic conditioning may operate via improved motor discharges from the central nervous system, thus enhancing the electrochemical activation and force generation of agonist muscles. Here we show that, for healthy individuals performing maximal voluntary contractions of the plantar flexors, the acute benefit elicited by ischemic conditioning on maximal isometric ankle torque production is largely explained by parallel gains in the surface myoelectrical activity of the triceps surae. However, the magnitude of this response appears to vary between individuals. These findings indicate that enhanced levels of agonist activity contribute to the ergogenic effect of ischemic conditioning during maximal efforts, thereby enabling more direct assessments of neural output following the procedure.
(Copyright © 2019 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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