Muscle Oxygen Saturation Correlates with Muscle Mechanomyography During Prolonged Electrical Stimulation-Evoked Wrist Extension Exercise
This study assessed electrically-evoked sustained muscle contractions with real-time changes in near-infrared spectroscopy and mechanomyography signals. Twenty healthy volunteers performed electrical-evoked wrist extension for 10 min. Root mean square derived from MMG (%RMS-MMG) and tissue oxygen saturation (%StO2) from NIRS of the extensor carpi radialis (ECR) muscle were monitored throughout the sessions. The correlated responses of these two measures comprised of 7 consecutive sets of 10 contractions each. %StO2 revealed an initial decline from muscle contraction 1 to 10 and then an increase from contraction 11 to 70. For %RMS-MMG, a significant decrease was observed from contraction 1 to 10 as well as from contraction 41 to 60 while an increase was seen from contraction 11 to 40 and from contraction 61 to 70. Positive low-order correlations were found between %StO2 and %RMS-MMG during the start of the exercise while later on, the two variables were negatively correlated. As the number of contractions increased over time, increased %StO2 revealed good oxygen saturation aligned with decreased %RMS-MMG values, suggesting decreased muscle fiber activation and strength. In this study, the physiological muscle responses were associated with its mechanical characteristics.
KeywordsFunctional electrical stimulation Muscle strength Muscle oxygenation Rehabilitation Upper limb
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