Subject of study. Blood is studied as a medium whose parameters and flow velocity enable scientists and physicians to determine the functional state of a person. Aim of study. Development of a method and mobile optical sensors for rapid diagnostics of a person’s functional state in real time is pursued. Method. A fundamentally new method for monitoring the functional state of a person is proposed based on the simultaneous recording of the pulse wave (PW) and tissue oximetry using developed mobile optical sensors that do not create significant inconvenience during sports activities, occupational tasks, or rest. Main results. A new method for real-time monitoring of the functional state of a person with a high reliability of the obtained results (greater than 98%), confirmed by clinical examination of patients, is proposed. Mobile optical sensor designs have been fabricated using a linear charge-coupled device (CCD) array with line-by-line charge transfer for PW recording and 18 radiation wavelengths from the visible and infrared spectral ranges for tissue oximetry, integrated into a unified signal processing system based on new algorithms. A method for monitoring the level of maximum oxygen consumption of the human body during rapid assessment of its state without the use of an ergospirometer has been developed and implemented. Practical significance. The developed method and the system of mobile optical sensors for its implementation make it possible to overcome previously encountered limitations associated with a low signal-to-noise ratio of the recorded signal and insufficient data informativeness, thereby enabling the acquisition of reliable real-time information on the state of the human cardiovascular system and the aerobic performance of the human body based on maximum oxygen consumption at the locations and time points required for monitoring.
Davydov et al. (Fri,) studied this question.