Triathlon and other endurance races have grown in popularity. Although participants are generally fit and presumably healthy, there is measurable morbidity and mortality associated with participation. In triathlon, most deaths occur during the swim leg, and more insight into risk factors, such as hypothermia, is warranted. In this study, we measured the core temperature of 51 participants who ingested temperature sensor capsules before the swim leg of a full-distance triathlon. The water temperature was 14.4–16.4 °C, and the subjects wore wetsuits. One subject with a low body mass index and a long swim time experienced hypothermia (<35 °C). Among the remaining subjects, we found no association between core temperature and swim time, body mass index, or sex. To conclude, the present study indicates that during the swim leg of a full-distance triathlon in water temperatures ≈ 15–16 °C, subjects with a low body mass index and long swim times may be at risk of hypothermia even when wearing wetsuits.

中文翻译：

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冷水铁人三项游泳期间的核心温度

铁人三项和其他耐力赛越来越受欢迎。尽管参与者通常身体健康并且可能是健康的，但与参与相关的发病率和死亡率是可衡量的。在铁人三项中，大多数死亡发生在游泳腿期间，因此需要更深入地了解风险因素，例如体温过低。在这项研究中，我们测量了 51 名在全距离铁人三项游泳腿之前摄入温度传感器胶囊的参与者的核心温度。水温为14.4-16.4°C，受试者穿着潜水服。一名体重指数低且游泳时间长的受试者出现体温过低 (<35 °C)。在其余受试者中，我们发现核心温度与游泳时间、体重指数或性别之间没有关联。总结一下，