Clinical trial NCT05409560: Core Temperature Afterdrop in Cold-water Swimming
Official title: Analysis of Core Temperature Afterdrop and Factors Associated With Afterdrop in Cold-water Swimming
Study type: OBSERVATIONAL
Overall status: COMPLETED
Conditions: Hypothermia, Accidental
Cold Water Swimming
Lead sponsor: University Hospital, Caen
Sponsor class: OTHER
First posted: 2022-06-08
Enrollment: 15
Sex: ALL
Minimum age (years): 18
Maximum age (years): 65
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Observational model: COHORT
Time perspective: PROSPECTIVE
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).

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.


Eligibility criteria: 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.

Primary outcomes:
measure: Change in Body Core Temperature
timeFrame: Continuous measurement was collected from 30 minutes before the race until 2 hours after the end of the race for each swimmer
Secondary outcomes:
measure: Body composition, body mass
timeFrame: One measurement assessed the day before the race
measure: Body composition, fat-free mass
timeFrame: One measurement assessed the day before the race
measure: Body composition, muscle mass
timeFrame: One measurement assessed the day before the race
measure: Distance
timeFrame: The distance of swimming was collected from the organisers immediately after the race
measure: Duration
timeFrame: The duration of swimming was collected from the organisers immediately after the race
measure: Individual characteristics, gender
timeFrame: One evaluation assessed the day before the race
measure: Individual characteristics, age
timeFrame: One evaluation assessed the day before the race
measure: Individual characteristics, swimming habits
timeFrame: One evaluation assessed the day before the race
measure: Individual characteristics, training in cold environment
timeFrame: One evaluation assessed the day before the race
Other outcomes:
Locations:
city: Caen
country: France
facility: CHU Caen Normandie
Study officials:
References: