白血球分画におよぼす運動の影響

抄録

It is well known that exercise affects white blood cells. However, most studies on these effects were conducted on athletic persons or inactive persons. Therefore, we attempted to investigate the effects of exercise on leukocyte subsets in non-athletic healthy persons. The study was conducted on a total of 10 non-athletic healthy volunteers consisting of five men and five women. Blood samples were collected in the resting stage (B1), immediately after exercise (B2), and in the recovery phase (B3). Treadmill exercise was performed using the Bruce treadmill protocol. The mean recovery time of heart rate in the recovery phase was 6.6±0.6 minutes. Total leukocytes increased from 7, 290/μl to 10, 990/μl at the end of exercise (B2) mainly due to the increase in lymphocytes. The percentage of CD56 positive cells (mostly NK cells) in the lymphocyte population increased, CD3 positive cells (mostly T cells) decreased, and CD20 positive cells (mostly B cells) did not change immediately after exercise. The proportion of CD4 positive cells (mostly T helper/inducer cells) decreased after exercise (B2), whereas CD8 positive cells (mostly T cytotoxic/suppressor cells) were relatively unaffected. As a result, the ratio of CD4 to CD8 decreased. These changes almost returned to the pre-exercised levels in the recovery phase (B3). The cytotoxic capacity of the blood cell improved markedly immediately after exercise. However, the effect was transient.