Akın, AtaŞayli, ÖmerÇotuk, Hasan Birol2021-02-252021-02-2520141303-62031300-0632https://hdl.handle.net/11411/3314https://doi.org/10.3906/elk-1210-51In this study, the process of muscular fatigue was examined using surface electromyography (sEMG) and continuous-wave near-infrared spectroscopy (cw-NIRS) simultaneously during an isometric hand grip exercise at 50% and 75% of the maximal voluntary contraction (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.eninfo:eu-repo/semantics/openAccessFatigueoxygenationnear-infrared spectroscopysurface electromyographyisometric exerciseArticle2-s2.0-8489783143510.3906/elk-1210-51Q4WOS:000332942900020