Application of equipment Sonocard for functional reserves evaluation during extravehicular activity
Baevsky RM, et al. (2011). "Application of equipment Sonocard for functional reserves evaluation during extravehicular activity."
Introduction. Extravehicular activity (EVA) and working on ISS (International space station) is a very strong physical and psychoemotional activity for a human organism. At the same time it is important to know functional reserves of the organism before and after EVA. It is necessary to know cosmonaut’s fatigue and there’s expenditure of energy for working in space, and determination cosmonaut’s ability for further EVA. For solution these problems was used the device SONOCARD. This device has been using already for three years of the same name experiment and there is wide experience at monitoring and valuation recovery of crewmember’s functional reserves during the sleep. Methods. Study before working in the open space was performed for 5-10 days. Retest was performed at the first night after EVA. The device SONOCARD is to be carried in the T-shirt upper left pocket. Sensor of the device responds to breast microoscillations produced by cardiac beats and breathing. After waking-up, cosmonaut connects the device to intended PC for copying the night record into PC memory for ensuing downloading via the communication channels for the further exploration. Experimental sessions were performed during three EVA by two Russian cosmonauts. One of them participated in all EVA, another – only in two EVA. Results. All the cosmonauts hadn’t deviation at the parameters of autonomic regulation before and after EVA, sleep quality was good and effective. Established that each successive EVA requires a higher tension regulation systems. The cosmonaut, made three EVA, has index of tension of regulatory systems were 121, 124 and 213 current units respectively and pNN50 index was equal to 17,7%, 7,0% and 3,9%. It is also shown that the degree of tension of regulatory systems in the ISS, is higher the longer the stay in space. Conclusion. Using the device SONOCARD is a promising method for evaluating the functional reserves of the cosmonauts organism and the efficient planning of operations responsible EVA.