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.
Study Type
OBSERVATIONAL
Enrollment
15
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
CHU Caen Normandie
Caen, France
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
Time frame: Continuous measurement was collected from 30 minutes before the race until 2 hours after the end of the race for each swimmer
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).
Time frame: One measurement assessed the day before the race
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).
Time frame: One measurement assessed the day before the race
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).
Time frame: One measurement assessed the day before the race
Distance
Distance of the swimming
Time frame: The distance of swimming was collected from the organisers immediately after the race
Duration
Duration of the swimming
Time frame: The duration of swimming was collected from the organisers immediately after the race
Individual characteristics, gender
The variable collected was the gender of participants
Time frame: One evaluation assessed the day before the race
Individual characteristics, age
The variables collected was the age of participants
Time frame: One evaluation assessed the day before the race
Individual characteristics, swimming habits
The variables collected was the swimming distance per week (total, swimming pool and open water)
Time frame: One evaluation assessed the day before the race
Individual characteristics, training in cold environment
The variable collected was the type of specific training in cold environment (yes/no)
Time frame: One evaluation assessed the day before the race
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