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Prolonged stable hypothermia during a 10-hour cold open-water marathon swim
Brendon H Roxburgh1,2, David T Edgar3, James D Cotter1,2
1School of Physical Education, Sport and Exercise Sciences, University of Otago, Dunedin, New Zealand.
Experimental Physiology
|January 21, 2026
Summary
Cold-water marathon swimming poses significant thermoregulatory challenges. This case study shows a cold-adapted swimmer maintained performance despite prolonged hypothermia during a 37 km Foveaux Strait swim.
Area of Science:
- Sports Science
- Environmental Physiology
- Human Thermoregulation
Background:
- Marathon open-water swimming, especially in cold conditions, presents extreme thermophysiological demands.
- The Foveaux Strait in New Zealand is known for its cold (13°C-14°C) and turbulent waters, posing significant challenges to swimmers.
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