Scientific rationale for changing lower water temperature limits for triathlon racing to 12°C with wetsuits and 16°C without wetsuits. Issue 11 (2nd May 2018)

• Record Type: Journal Article
• Authors: Saycell, Jane; Lomax, Mitch; Massey, Heather; Tipton, Mike
• Is Part Of: British journal of sports medicine. Volume 52:Issue 11(2018)
• Page Start: 702
• Page End: 708
• Publication Date: 2018-05-02
• Subjects: swimming -- triathlon -- aquatic sports -- Ioc -- thermoregulation; Sports medicine -- Periodicals; 617.1027
• DOI: 10.1136/bjsports-2017-098914
• Languages: English
• ISSNs: 0306-3674

Abstract

Abstract : Objectives: To provide a scientific rationale for lower water temperature and wetsuit rules for elite and subelite triathletes. Methods: 11 lean, competitive triathletes completed a 20 min flume swim, technical transition including bike control and psychomotor testing and a cycle across five different wetsuit and water temperature conditions: with wetsuit: 10°C, 12°C and 14°C; without wetsuit (skins): 14°C and 16°C. Deep body (rectal) temperature (Tre ), psychomotor performance and the ability to complete a technical bike course after the swim were measured, as well as swimming and cycling performance. Results: In skins conditions, only 4 out of 11 athletes could complete the condition in 14°C water, with two becoming hypothermic (Tre <35°C) after a 20 min swim. All 11 athletes completed the condition in 16°C. Tre fell further following 14°C (mean 1.12°C) than 16°C (mean 0.59°C) skins swim (p=0.01). In wetsuit conditions, cold shock prevented most athletes (4 out of 7) from completing the swim in 10°C. In 12°C and 14°C almost all athletes completed the condition (17 out of 18). There was no difference in temperature or performance variables between conditions following wetsuit swims at 12°C and 14°C. Conclusion: The minimum recommended water temperature for racing is 12°C in wetsuits and 16°C without wetsuits. International Triathlon Union rules for racing were changed accordingly (January 2017).