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Completed

NCT Number: NCT05409560

Core Temperature Afterdrop in Cold-water Swimming

A significant risk associated with hypothermia during exercise in a cold environment is the core temperature (T°core) afterdrop, which corresponds to a continuous fall in T°core during rewarming after hypothermia. However, the rate and predictors of the afterdrop are unclear, particularly during prolonged cold water swimming.

The investigators propose to measure the changes in T°core during and after a cold water swim at 12.5-13°C qualifying for English Channel swim and to test the impact of anthropometric and swimming parameters on the duration of the T°core afterdrop. The hypotheses are that afterdrop is common during a prolonged cold water swimming event and that protective factors against T°core drop during cold water swimming (increased body fat and BMI) might, conversely, be associated with prolonged afterdrop.

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Key information

Conditions

Hypothermia, Accidental Body Temperature Changes Cold Water Swimming Hypothermia Pathological Conditions, Signs and Symptoms Signs and Symptoms

Age range

18 year–65 year

Sex eligibility

All sexes

Study type

Observational

Primary location

CHU Caen Normandie

Caen, 14000, France

Who can participate

Healthy volunteers accepted: Yes

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

Inclusion criteria

  • swimmers taking part in the Channel Swim Camp
  • swimmers above 18 years of age
  • swimmers willing and able to give informed consent for participation in the study

Exclusion criteria

  • swallowing disorder
  • chronic gastrointestinal disease
  • MRI scheduled within 48 hours after the race.

Treatment and study plan

Swimming participants in the 6-hour cold water swim

Other

The 6-hour cold water swim was the qualifying swim for the English Channel swim during the Channel Swim Camp Dinard 2021 and participants were the swimmers registered for the 6-hour cold water swim who volunteered to participate in this study

Primary outcomes

  1. Change in Body Core Temperature

    Time frame: Continuous measurement was collected from 30 minutes before the race until 2 hours after the end of the race for each swimmer

    Measurement of Body Core Temperature using an ingestible electronic sensor (e-Celsius®, BodyCap , Caen, France) which provide a continuous validated measurement

Secondary outcomes

  1. Body composition, body mass

    Time frame: One measurement assessed the day before the race

    Fat mass (in kg, % of body mass [fat mass and body mass were combined to report % of body mass) was measured using bioelectrical impedance analysis (mBCA 525, Seca, Germany).

  2. Body composition, fat-free mass

    Time frame: One measurement assessed the day before the race

    Fat-free mass (in kg, % of body mass [fat-free mass and body mass were combined to report % of body mass) was measured using bioelectrical impedance analysis (mBCA 525, Seca, Germany).

  3. Body composition, muscle mass

    Time frame: One measurement assessed the day before the race

    Muscle mass (in kg, % of body mass [muscle mass and body mass were combined to report % of body mass) was measured using bioelectrical impedance analysis (mBCA 525, Seca, Germany).

  4. Distance

    Time frame: The distance of swimming was collected from the organisers immediately after the race

    Distance of the swimming

  5. Duration

    Time frame: The duration of swimming was collected from the organisers immediately after the race

    Duration of the swimming

  6. Individual characteristics, gender

    Time frame: One evaluation assessed the day before the race

    The variable collected was the gender of participants

  7. Individual characteristics, age

    Time frame: One evaluation assessed the day before the race

    The variables collected was the age of participants

  8. Individual characteristics, swimming habits

    Time frame: One evaluation assessed the day before the race

    The variables collected was the swimming distance per week (total, swimming pool and open water)

  9. Individual characteristics, training in cold environment

    Time frame: One evaluation assessed the day before the race

    The variable collected was the type of specific training in cold environment (yes/no)

Sponsors and collaborators

Lead sponsor

University Hospital, Caen

Other

Registry information

Official study title

Analysis of Core Temperature Afterdrop and Factors Associated With Afterdrop in Cold-water Swimming

Acronym: THERMOCOLD

Important dates

Study start
2021
Primary completion
2021
Study completion
2021
First posted
Jun 8, 2022
Registry last updated
Mar 26, 2025

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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