Effects of humid heat environment conditioning on post-training serum K+, Na+ concentrations and blood leukocyte count / 第二军医大学学报

ABSTRACT

Objective: To identify the effects of humid heat environment conditioning on the serum K+, Na+ concentrations and blood leukocyte count after weight-loading physical ability test (PAT), and to investigate the parameter changes with humid heat environment conditioning. Methods: A total of 59 male healthy volunteers, aged 18-23 years old, were divided into two groups, with 30 in the training group and 29 in the control group. The fasting venous blood samples were taken in the morning in both groups for determination of serum K+, Na+ concentrations and blood leukocyte count. The subjects in the training group received physical training (weight-loading) under humid heat environment condition for 6 weeks, and those in the control group received no training. Then the serum K+, Na+ concentrations and blood leukocyte count were determined again the next morning after they had participated a weight-loading PAT. Results: The serum K +, Na+ concentrations and blood leukocyte counts were similar in the 2 groups before training. The increase of electrolyte concentration after PAT was more prominent in the control group compared with the baseline level before training in the training group (F= 9.27, P = 0.0035; F= 366.46, P<0.0001 for K+ and Na+, respectively). Meanwhile, the control group also exhibited a significant elevation of total leukocyte count after PAT compared with the baseline level before training in the training group (F=10.20, P = 0.0023), mainly attributable to the increase of neutrophils (F= 12.25, P = 0.0009). Conclusion: The post-PAT serum Na +, K+ concentrations and white blood cell count, mainly neutrophils count, increase much more remarkably in the subjects undergoing no training in humid heat environment than those have been trained in humid heat environment.