Abstract
Changes in EEG were investigated in two ground-based hypogravity simulation experiments: 21-d dry immersion (DI) and 21-d bed rest (BR). Ten volunteersparticipated in DI, and 6 volunteers in BD. EEG was recorded before and on days 5 and 17 of DI and BR. EEG spectral power was analyzed using the fast Fourier transform. EEG spectral power during DI and BD were compared. Our results showed that some EEG changesduring DI and BD were similar. In both simulations, a decrease in theta1 and beta (beta1 in DI and beta2 in BR) spectral power was detected on the 5th day of exposure. However, in DI, the decrease in slow rhythms was more evident than in BR. Not only did theta1 decline, but the power in theta2, delta1, and delta2 bands also decreased. The differences between the two experiments were also seen on the 17th day of exposure. The theta and beta power increased on the 17th day of BR, reaching the baseline level, whereas, on the 17th day of DI, the spectral power of slow rhythms remained reduced.
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