Conduction Velocity of Muscle Action Potential of Knee Extensor Muscle During Evoked and Voluntary Contractions After Exhaustive Leg Pedaling Exercise

Overview

Journal Front Physiol

Date 2020 Jun 16

PMID 32536878

Citations 3

Authors

Kohei Watanabe

Taiki Sakai

Shosaku Kato

Natsuka Hashizume

Naoki Horii

Maki Yoshikawa

Natsuki Hasegawa

Keiko Iemitsu

Katsunori Tsuji

Masakata Uchida

Masao Kanamori

Motoyuki Iemitsu

Affiliations

Soon will be listed here.

Abstract

Purpose: Muscle fiber conduction velocity (CV) has been developed to estimate neuromuscular fatigue and measured during voluntary (VC) and electrically evoked (EC) contractions. Since CV during VC and EC reflect different physiological phenomena, the two parameters would show inconsistent changes under the conditions of neuromuscular fatigue. We investigated the time-course changes of CV during EC and VC after fatiguing exercise.

Methods: In 14 young males, maximal voluntary contraction (MVC) of knee extensor muscles, CV during electrical stimulation (CV-EC) and MVC (CV-VC) were measured before and immediately, 30 min, 60 min, 120 min, and 24 h after exhaustive leg pedaling exercise.

Results: CV-EC significantly increased immediately after the fatiguing exercise ( < 0.05) and had a significant negative correlation with MVC in merged data from all time-periods ( = -0.511, < 0.001). CV-VC significantly decreased 30, 60, and 120 min after the fatiguing exercise ( < 0.05) and did not show any correlations with MVC ( > 0.05).

Conclusion: These results suggest that CV during EC and VC exhibits different time-course changes, and that CV during EC may be appropriate to estimate the degree of neuromuscular fatigue after fatiguing pedaling exercise.

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