Core Temperature Afterdrop in Cold-water Swimming

Hypothermia, Accidental Clinical Trial

— THERMOCOLD  

Official title:

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

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT05409560
• Other study ID #: THERMOCOLD
• Status: Completed
• Start date: May 21, 2021
• Est. completion date: August 19, 2021

Study information

• Verified date: June 2022
• Source: University Hospital, Caen
• Contact: n/a
• Is FDA regulated: No
• Study type: Observational

Clinical Trial 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.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 15
• Est. completion date: August 19, 2021
• Est. primary completion date: May 23, 2021
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 18 Years to 65 Years

Eligibility

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.

Related Conditions & MeSH terms

• Hypothermia
• Hypothermia, Accidental

Intervention

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

Locations

Country	Name	City	State
France	CHU Caen Normandie	Caen

Sponsors (2)

Lead Sponsor	Collaborator
University Hospital, Caen	INSERM UMR U1075 Comète GIP Cyceron, unicaen, Caen Normandie

Country where clinical trial is conducted

France, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	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	Body composition, body mass	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).	One measurement assessed the day before the race
Secondary	Body composition, fat-free mass	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).	One measurement assessed the day before the race
Secondary	Body composition, muscle mass	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).	One measurement assessed the day before the race
Secondary	Distance	Distance of the swimming	The distance of swimming was collected from the organisers immediately after the race
Secondary	Duration	Duration of the swimming	The duration of swimming was collected from the organisers immediately after the race
Secondary	Individual characteristics, gender	The variable collected was the gender of participants	One evaluation assessed the day before the race
Secondary	Individual characteristics, age	The variables collected was the age of participants	One evaluation assessed the day before the race
Secondary	Individual characteristics, swimming habits	The variables collected was the swimming distance per week (total, swimming pool and open water)	One evaluation assessed the day before the race
Secondary	Individual characteristics, training in cold environment	The variable collected was the type of specific training in cold environment (yes/no)	One evaluation assessed the day before the race