ORIGINAL ARTICLE   

Gazzetta Medica Italiana - Archivio per le Scienze Mediche 2022 January-February;181(1-2):50-8

DOI: 10.23736/S0393-3660.19.04279-7

Copyright © 2019 EDIZIONI MINERVA MEDICA

lingua: Inglese

The mechanisms of central alteration, sympathovagal imbalance, and α-motor unite dysfunction after acute fatiguing exercise: a preliminary study

Shuxun CHI ^{1, 2}, Orawan BURANRUK ^{1, 2} ✉, Hongwei LI ³

¹ School of Physical Therapy, Faculty of Associated Medical Sciences, Khon Kaen University, Khon Kaen, Thailand; ² Research Center in Back, Neck, Other Joint Pain and Human Performance (BNOJPH), Khon Kaen University, Khon Kaen, Thailand; ³ College of Physical Education, Gan Nan Normal University, Gan Zhou, China

BACKGROUND: The aim of this study was to illuminate the characteristics of electrical detection signals under acute fatigue, and to discuss the main role of the central nervous system (CNS) in fatigue progress by correlation analysis.
METHODS: Sixteen healthy students participated at measurement of electrical signals under rest, fatigue and recovery. Prefrontal cortexes, the front-side of hand, and rectus femoris muscle (RF), medial vastus muscle (MV) were settled to measure signals.
RESULTS: Power spectra of alpha, theta, and beta waveform showed synchronous increase under fatigue. Root means square (RMS) showed an increase with median frequency (MF) showing decrease. In addition, Stress Index (SI) and low frequency (LF) showed increase, but the standard deviation of R-R interval (SDNN), and high frequency (HF) performed decrease. Skin conductance level (SCL) also showed a decrease under fatigue. Correlation analysis proved that all electroencephalograph (EEG) waveforms have a strong or very strong correlation with MF-MV, LF, and HF (rs>0.60) under power spectrum analysis. However, no strong relationships were found between HRV, EMG, and SC parameters.
CONCLUSIONS: CNS may play the main role in fatigue progress, and the autonomic nervous system (ANS) may be the ties of CNS and muscle. Central alteration stem from concurrently inhibition and excitatory activation may induce the ANS and muscle dysfunction.

KEY WORDS: Fatigue; Muscle fatigue; Exercise