To construct a simple device used for quantitative measurement of muscle fatigue degree.
A percutaneous electric stimulation means, a non-invasive oxygen measuring means used for the continuous measurement of oxidized and deoxidized hemoglobin quantities at a certain area in the body, and a muscle fatigue degree measuring device with a built-in calculator are provided. In this device, electric stimulations are periodically given by the percutaneous electric stimulation means to the body in part in repeated cycles of electrification period and rest period, and concurrently a non-invasive oxygen quantity measuring means is applied to the certain area in the body part receiving electric stimulations to continuously measure oxidized and deoxidized hemoglobin quantities there for a predetermined time. The measured data acquired from the non-invasive oxygen quantity measuring means are recorded by the calculator, which calculates average phase differences of increase/decrease waves of oxidized and deoxidized hemoglobin quantities in consecutive cycles during the predetermined time.
Osamu Kawamiya
Takuji Yamada