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J Appl Physiol 97: 920-924, 2004. First published May 14, 2004; doi:10.1152/japplphysiol.00043.2004
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Effects of 10-day confinement on the immune system and psychological aspects in humans

Tamiyasu Shimamiya,1 Nobuyuki Terada,1 Yoshimitsu Hiejima,1 Sonoe Wakabayashi,1 Hirotake Kasai,2 and Motohiko Mohri3

1Center for Life Science Research, 2Department of Microbiology, University of Yamanashi, Yamanashi 409-3898; and 3Nippon Marine Enterprises, Yokosuka 238-0004, Japan

Submitted 15 January 2004 ; accepted in final form 12 May 2004

We investigated the changes in percentages of leukocyte subpopulations, natural killer (NK) cells, CD69-expressing lymphocytes, and psychological aspects in 10 subjects who participated in a 10-day confinement study. Suppression of lymphocyte proliferative reaction and changes in leukocyte distribution are known to occur in space. These responses are similar to those induced by psychological stress. Ground-based confinement studies are suitable for validating the effects of stress arising only due to confinement. Two groups, consisting of five male subjects (ages 20–27 yr, mean 22.8 yr) each, participated in a 10-day confinement study. Blood samples were taken once before, three times during, and once after the confinement and activated with an anti-CD2 agonistic antibody cocktail. The percentages of leukocyte subpopulations, NK (CD45+CD56+) cells, and activated lymphocytes (CD45+CD69+) were measured by flow cytometric assay. The face scale test was used to measure psychological aspects. The percentage of CD69+ lymphocytes decreased during the period of confinement. This was mostly caused by changes in the ratio between NK and non-NK lymphocytes. The face scale showed that the subjects' moods improved toward the postconfinement period. Consistent with the face scale, the percentages of innate immune cells, such as NK cells and granulocytes, increased during the postconfinement period. We concluded that the changes in the distribution of immune cells caused by stress plays an important role in suppression of proliferative reactivity. The observed physiological reactions were specific to the confined environment, and the stress caused by confinement plays a role in the immune changes observed in space.

CD69; mitogenic reaction; stress; granulocyte; natural killer cell


Address for reprint requests and other correspondence: T. Shimamiya, Center for Life Science Research, Univ. of Yamanashi, 1110 Shimokato, Tamaho, Yamanashi, Japan 409-3898 (E-mail: tamiyasu{at}yamanashi.ac.jp).






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