Prevalence of hypothermia and critical hand temperatures during military cold water immersion training

• Published in: International Journal of Circumpolar Health
• Main Authors: Douglas M. Jones, Rebecca S. Weller, Rebecca J. McClintock, Nicholas Roberts, Weimin Zheng, Timothy L. Dunn
• Format: Article in Journal/Newspaper
• Language: English
• Published: Taylor & Francis Group 2023
• Subjects: Cold-injury; warfighter; cold-weather medicine; core temperature; hand function; Arctic medicine. Tropical medicine; RC955-962; Arctic; Circumpolar Health; International Journal of Circumpolar Health
• Online Access: https://doi.org/10.1080/22423982.2023.2236777; https://doaj.org/article/66e3fd489d0e4ba6a3bc4d47b6a0a450

ABSTRACTCold-weather military operations can quickly undermine warfighter readiness and performance. Specifically, accidental cold-water immersion (CWI) contributes to rapid body heat loss and impaired motor function. This study evaluated the prevalence of hypothermia and critical hand temperatures during CWI. One-hundred seventeen (N = 117) military personnel (mean ± SD age: 27 ± 6 yr, height: 176 ± 8 cm, weight: 81.5 ± 11.6 kg) completed CWI and rewarming during cold-weather training, which included a 10-min outdoor CWI (1.3 ± 1.4°C) combined with cold air (−4.2 ± 8.5°C) exposure. Following CWI, students removed wet clothing, donned dry clothing, and entered sleeping systems. Core (Tc) and hand (Thand) temperatures were recorded continuously during the training exercise. Tc for 96 students (mean ± SD lowest Tc = 35.6 ± 0.9°C) revealed that 24 students (25%) experienced Tc below 35.0°C. All of 110 students (100%) experienced Thand below 15.0°C, with 71 students (65%) experiencing Thand at or below 8.0°C. Loss of hand function and hypothermia should be anticipated in warfighters who experience CWI in field settings. Given the high prevalence of low Thand, focus should be directed on quickly rewarming hands to recover function.