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Research on Change Process of Individual Emotions in the Whole Cycle of Long-term Head-down Tilt Bed Rest
Pages: 18-24
Year: Issue:  1
Journal: Space Medicine & Medical Engineering

Keyword:  head-down tilt bed restemotionadaptivitysalivary cortisol;
Abstract: Objective To track and evaluate the individual emotional changes in whole cycle under the condition of long-term head-down tilt bed rest(HDBR).Methods Thirty-six male volunteers of the90-day HDBR experiment were divided into five groups according to the different exercise strategies.Anxiety,depression,mood state and salivary cortisol in the whole 135 days cycle(the first 15 days before bed rest was the pre-adaptation period,the strict bed rest period was 90 days,and the recovery period after bed rest was 30 days) were measured and the changes of each index were evaluated.Results Changes of the negative emotional components and the state anxiety on each test point were not significant(P>0.05),but they were lower than the norm.During the 30~70 d bed rest period,vigor-activity(V) decreased along with the significantly increased depression(P<0.05).Bth of them were negatively correlated(r=-0.82,P<0.01).But depression was also lower than the norm.Only the fatigue-inertia(F) component was marginal significant(P=0.06) among different exercise groups on 20 d.Salivary cortisol levels on all test points were lower than the 1 st day.Conclusion The emotion changes of the volunteers were moderate and mainly influenced by the positive affect during the whole-cycle of HDBR.The emotion showed a relative depressive state in middle and later stages.The whole-cycle emotional process of volunteers expressed the process of individuals’ active adjustment and selecting appropriate behavioral responses to physiological adaptation of weightlessness.
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