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OpenTrials
Completed

NCT Number: NCT06685627

Core Temperature in Open Water Wetsuited Swimming.

Swimming in cold water is intrinsically unsafe. One of the threats is a fall in core body temperature (Tcore), which adversely affects all body systems and increases the risk of death. Wetsuits mitigate, but do not negate this threat. Environmental conditions may confound findings from laboratory studies or computer models, thus necessitating open water studies.

This study was designed to investigate the effects of open water wetsuited swimming on core body temperature at a range of different water temperatures between 8.4oC and 24.5oC.

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Key information

Conditions

Temperature Common Cold Infections Picornaviridae Infections RNA Virus Infections Respiratory Tract Diseases Respiratory Tract Infections Virus Diseases

Age range

18 year–65 year

Sex eligibility

All sexes

Study type

Observational

Primary location

Institute of Clinical Medicine, University of Oslo, Oslo, Norway

Olso, Norway

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Trained and highly trained swimmers.

Exclusion criteria

  • a history of cardiovascular disease, arrhythmias, or gastrointestinal abnormalities precluding the use of rectal temperature measurement.

Treatment and study plan

Open water wetsuited swimming.

Other

All swimmers used their own well-fitting wetsuits (5 mm maximum thickness in accordance with World Triathlon guidelines7) and were free to supplement additional neoprene hats, gloves and booties as desired. A safety paramedic attended all swims. Swim distance was self-determined

Primary outcomes

  1. Core temperature

    Time frame: The thermistor was inserted 15 minutes prior to immersion and measured the core temperature until 30 minutes after egress from the water.

    A self-inserted rectal pill was used to continuously measure core temperature in 76 open water swims by 31 wetsuited swimmers in water temperatures ranging from 8.4°C to 24.5°C. The Tcore curves were analysed by linear mixed model regression.

Sponsors and collaborators

Lead sponsor

University Hospital, Akershus

Other

Collaborators

  • Norwegian Armed Forces Medical Service
  • Oslo University Hospital
  • SINTEF MiNaLab

Registry information

Official study title

Core Temperature in Open Water Wetsuited Swimming: a Cohort Study

Important dates

Study start
2015
Primary completion
2020
Study completion
2020
First posted
Nov 12, 2024
Registry last updated
Nov 12, 2024

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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