Cold Water Swimming, Hypothermia, Accidental
Conditions
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.
Interventions
OTHERSwimming 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
Sponsors
University Hospital, Caen
Study design
Observational model
COHORT
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
18 Years to 65 Years
Healthy volunteers
Yes
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.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Change in Body Core Temperature | 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
| Measure | Time frame | Description |
|---|---|---|
| Body composition, fat-free mass | 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). |
| Body composition, muscle mass | 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). |
| Distance | The distance of swimming was collected from the organisers immediately after the race | Distance of the swimming |
| Duration | The duration of swimming was collected from the organisers immediately after the race | Duration of the swimming |
| Body composition, body mass | 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). |
| Individual characteristics, age | One evaluation assessed the day before the race | The variables collected was the age of participants |
| Individual characteristics, swimming habits | One evaluation assessed the day before the race | The variables collected was the swimming distance per week (total, swimming pool and open water) |
| Individual characteristics, training in cold environment | One evaluation assessed the day before the race | The variable collected was the type of specific training in cold environment (yes/no) |
| Individual characteristics, gender | One evaluation assessed the day before the race | The variable collected was the gender of participants |
Countries
France
Outcome results
None listed