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Related Experiment Video

Updated: Jun 20, 2026

Non-invasive Assessments of Subjective and Objective Recovery Characteristics Following an Exhaustive Jump Protocol

Non-invasive Assessments of Subjective and Objective Recovery Characteristics Following an Exhaustive Jump Protocol

Published on: June 8, 2017

Swimming in ice cold water.

B Knechtle¹, N Christinger, G Kohler

¹Gesundheitszentrum St. Gallen, Switzerland. beat.knechtle@hispeed.ch

Irish Journal of Medical Science

|September 19, 2009

Summary

Higher body fat may enable longer cold water swims. Continuous monitoring of body core temperature and heart rate is crucial for athlete safety in water below 5°C.

Area of Science:

Sports Science
Environmental Physiology

Background:

Investigated two athletes swimming in 4°C water.
Distances: 1.3 km (23 min) and 2.2 km (42 min).

Purpose of the Study:

To explore factors influencing cold water swimming duration.
To highlight safety considerations for extreme cold water immersion.

Main Methods:

Measured percent body fat pre-swim.
Measured core body temperature post-swim.

Main Results:

Swimmer 2 (longer duration) had higher body fat.
Swimmer 2's core temperature dropped significantly post-swim (37°C to 32°C).

Conclusions:

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Higher body fat and experience may enhance cold water swimming performance.

Continuous monitoring of core temperature and heart rate is vital for safety in cold water swimming.