Core Temperature Afterdrop in Cold-water Swimming

NCT05409560 | Completed

• 1 other identifier: THERMOCOLD
• Study Type: observational
• Target: 15
• Locations: 1 country
• Sites: 1

Brief Summary

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.

Conditions

Hypothermia, Accidental; Cold Water Swimming

Outcome Measures

Primary Outcomes (1)

• Change in Body Core Temperature

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

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

Secondary Outcomes (9)

• Body composition, body mass

  One measurement assessed the day before the race

• Body composition, fat-free mass

  One measurement assessed the day before the race

• Body composition, muscle mass

  One measurement assessed the day before the race

• Distance

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

• Duration

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

Study Arms (1)

Cold water swimmers

swimmers participating in the 6-hour cold water swim, qualifying for the English Channel Swim

Other: Swimming participants in the 6-hour cold water swim

Interventions

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

Cold water swimmers

Eligibility Criteria

• Age: 18 Years - 65 Years
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64), Older Adult (65+)
• Sampling Method: Probability Sample

Study Population

Swimmers participating in the 6-hour cold-water swim, qualifying for the English Channel swim at the Channel Swim Camp (Dinard, France).

You may qualify if:

• 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

You may not qualify if:

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

Sponsors & Collaborators

• University Hospital, Caen: lead

Study Sites (1)

CHU Caen Normandie

Caen, 14000, France

Location

MeSH Terms

Conditions

Hypothermia

Condition Hierarchy (Ancestors)

Body Temperature Changes; Signs and Symptoms; Pathological Conditions, Signs and Symptoms

Study Design

• Study Type: observational
• Observational Model: COHORT
• Time Perspective: PROSPECTIVE
• Sponsor Type: OTHER
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: April 17, 2022
• First Posted: June 8, 2022
• Study Start: May 21, 2021
• Primary Completion: May 23, 2021
• Study Completion: August 19, 2021
• Last Updated: March 26, 2025

Record last verified: 2022-06

Locations

FR (1)