Correlation analysis between surface electromyography and continuous-wave near-infrared spectroscopy parameters during isometric exercise to volitional fatigue

Authors : Ömer ŞAYLİ, Ata AKIN, Hasan Birol ÇOTUK

Pages : 780-793

Doi:10.3906/elk-1210-51

View : 31 | Download : 8

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :In this study, the process of muscular fatigue was examined using surface electromyography insert ignore into journalissuearticles values(sEMG); and continuous-wave near-infrared spectroscopy insert ignore into journalissuearticles values(cw-NIRS); simultaneously during an isometric hand grip exercise at 50% and 75% of the maximal voluntary contraction insert ignore into journalissuearticles values(MVC);, sustained until volitional fatigue. The mean frequency of the sEMG decreased during the whole exercise, whereas the root mean square had a tendency to increase. Oxyhemoglobin/deoxyhemoglobin concentration changes computed with cw-NIRS were found to exhibit a fast linear decrease/increase in the first 10--20 s of the exercise, the so-called fast phase, followed by a plateau-like slow phase. The change rates were higher at 75% MVC for both the sEMG and cw-NIRS parameters. Significant correlations were found, especially at 50% MVC, between the sEMG parameters computed for the whole exercise and cw-NIRS parameters computed from the early region of the exercise, i.e. infection duration and amplitude changes to the inflection point. The findings emphasize the potential of cw-NIRS for muscle studies.
Keywords : Fatigue, oxygenation, near infrared spectroscopy, surface electromyography, isometric exercise