目的 观察VICHY防晒霜对官兵海上游泳训练预防日晒伤的效果。方法 采取整体抽样、随机双盲的方法，分别对不同单位海上游泳训练的官兵进行防晒效果的比较观察。每批次均设观察组和对照组，观察组（n=850）每次下海游泳训练前将防晒霜涂抹在颈项及肩背部，训练2 h上岸休息时追加涂抹1次；对照组（n=700）基本不进行处理。观察组防晒效果观察：比较训练期内观察组和对照组日晒伤的发病率及其晒伤程度。同时，采集晒伤战士的血样（n=100），ELISA法检测外周血中炎性反应因子IL-6含量。结果 海上游泳训练第1周，观察组累积发生日晒伤54例(6.35%)，对照组发生日晒伤273例 (39.0%)，经Tukey检验差异有统计学意义(P<0.01)。观察组日晒伤程度较轻，以Ⅰ度晒伤为主，对照组Ⅰ度晒伤数量显著增加，两组比较，差异有统计学意义(P<0.01)。相关性分析表明，患者外周血IL-6含量与晒伤程度成正相关性。结论 防晒霜用于预防海训官兵日晒伤效果较好。

Objective To investigate the protective effects of sunscreen cream of VICHY on PLA soldiers in summer swimming. Methods （1）An 8 week, blinded, randomized study was conducted in 1550 PLA soldiers during summer swimming training to evaluate the efficacy of the sunscreen cream. The sunscreen cream was applied randomly to the face, arms, shoulder,and back of volunteer soldiers at 2 hours time intervals in experimental groups everyday(n=800). Subjects used a sun protection factor (SPF) 30 of sunscreen cream containing 5% benzophenone-3, octyl methoxycinnamate, and titanium dioxide. On the contrary, the control group applied placebo of cream emulsions. The IL-6 level of peripheral blood of PLA soldiers in summer swimming training was assessed by ELIASA. The Results were analyzed by comparing the occurrence of sunburn by Tukey test. Results The all accumulated cases were 1550, including 850 for experimental group, 700 for control group. The sun burn occurred in 54(6.35%) in experimental group, and 273 (39.0%) in control group on first week in sea training. Tukey test showed that there was significant difference in the percentage of subjects with improvement between experimental groups and control group (P＜0.01), IL-6 level was elevated in the 2-5 days. Conclusions Use of the sunscreen cream of VICHY provides a good protective effects of sunscreen for sea training in PLA soldiers.