健常若年成人におけるトレッドミル短時間亜最大運動負荷前後のNatural Killer(NK)細胞活性とホルモン濃度変化

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The purpose of this study was to demonstrate natural killer (NK) cell activity and hormonal responses of young adults before and after the short-term (10 to 13 minutes) submaximal treadmill exercise testing. The peakV^^・O_2 of each of 11 female adults was meas- ured. In addition, the blood samples of each of them were collected before, immediately after, and 30, 60 and 120 minutes after the exercise. There was no correlation between NK cell activity and peakV^^・O_2 (44.7 ± 7.3 ml/min./Kg) at basal (31.4 ± 14.2%) or peak (46.0 ± 16.0%) level in non-athletes. The NK cell activity significantly increased immediately after the exercise, then returned to the basal level after 30 minutes. Blood plasma levels of adrenaline, noradrenaline and ADH indicated similar pattern to the NK cell activity. However, the level of ACTH was not found to have a significant change statistically. The rate of NK cell activity change immediately after the exercise was correlated to that of adrenaline concentration change (r = .445, P < .05). And, that of ADH concentration change was correlated to that of adrenaline concentration change (r = .954, P < .001). In addition, the correlation between the rates of ADH concentration change and those noradrenaline was r = .654, P = .056. It was suggested from the present study that (1) the increase of NK cell activity was a transient change due to the secretion of catecholamine evoked by the exercise, (2) the manner that the increased NK cell activity returned to the basal level at 30 minutes after the exercise was characteristic, because it has been reported that the NK cell activity increased during exercise (60 min., 75% of maximal O_2 uptake) and dropped below basal level 2 hours afterward, and (3) the secretion of ADH might be partially due to the secretion of catecholamine.
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健常若年成人におけるトレッドミル短時間亜最大運動負荷前後のNatural Killer(NK)細胞活性とホルモン濃度変化

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