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选择中老年长期坚持冬泳者（常年游泳）３０名（持续组），夏秋季游泳、寒冬不游泳者２６名（暂停组），分别与条件相似的未游泳者３２名（对照组）进行比较。受试者当年初冬采血后，次年春末（前两组）采血复查。分别查周围血象、免疫球蛋白（Ｉｇ）、淋巴细胞亚群、ＮＫ细胞。经统计学处理后显示：持续组冬泳后比冬泳前中性粒细胞降低，淋巴细胞增高，差异具显著性（绝对值）和非常显著性（百分率）。暂停组停止冬泳后也有类似变化，但仅百分率具显著性差异。ＩｇＧ持续组和暂停组春末复查均有增加，差异具显著性和非常显著性。ＩｇＡ持续组冬泳后降低，差异显著。冬泳后，持续组和暂停组Ｔ３均略降低，Ｔ４、Ｔ８和ＮＫ细胞均上升。Ｔ４／Ｔ８比值，冬泳前持续组和暂停组两组无显著差异，冬泳后持续组升高，暂停组降低，差异显著。
A total of 30 middle-aged and old-aged swimmers (perennial swimmers), 30 swimmers who continued swimming in summer and autumn and 26 non-swimmers in winter were selected as the middle-aged or elderly group, and 32 non-swimmers (control group) with similar conditions were compared. Subjects early winter after the blood collection, the following spring (the first two groups) blood examination. Respectively check the surrounding blood, immunoglobulin (Ig), lymphocyte subsets, NK cells. After statistical treatment, the persistence group showed a significant (absolute value) and a significant (percentage) difference in neutrophilic granulocyte count and lymphocytosis before winter swimming. There were similar changes after the suspension group stopped winter swimming, but only the percentage was significantly different. IgG persistence group and suspension group late spring review have increased, the difference was significant and very significant. IgA persistent group decreased after winter swimming, the difference was significant. After swimming in winter, T3 and T3 in both the continuous group and the suspended group decreased slightly, while T4, T8 and NK cells increased. T4 / T8 ratio, there was no significant difference between the two groups before and after winter swimming. After the winter swimming, the sustained group increased and the suspended group decreased, the difference was significant.