An interventional study of Water Biking in hot water condition and Water Biking in neutral water condition in Healthy and Heat Exposure, sponsored by University Hospital, Montpellier. Completed at 1 site in France. Open to participants aged 18 Years to 60 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-06-12.
Sponsored by University Hospital, Montpellier · Not applicable, Interventional, and Prevention
The goal of this clinical trial is to compare the efficiency of water biking training in hot (35°C) versus neutral (25°C) temperature water to elicite heat acclimation in healthy recreative athletes.
The goal of this clinical trial is to compare the efficiency of water biking training in hot (35°C) versus neutral (25°C) temperature water to elicite heat acclimation in healthy recreative athletes. The main questions it aims to answer are:
Participants will have to do pre and post training tests in both normal environment (cardiorespiratory stress test, force/velocity profile test, echocardiography) and artificially hot and humid indoor environment (time trial). The training protocols consists in 10 sessions of 1 hour of water bike aerobic training (5 times a week for 2 weeks) at an intensity based on the heart rate corresponding to the 1st respiratory threshold, in hot (interventional group IG: 35°C) versus neutral (control group CG: 25°C) water.
University Hospital, Montpellier is the lead sponsor of 1,244 studies on the registry; 225 are open to participants now.
Counted across the registry records on this site, refreshed daily.
Exclusion Criteria:
Participants do the water biking training for two weeks, 1 hour a day, in hot water temperature (35°C)
Other: Water Biking in hot water condition
Participants do the water biking training for two weeks, 1 hour a day, in neutral water temperature (25°C)
Other: Water Biking in neutral water condition
Training protocol includes 10 water biking sessions in hot water temperature (35°C) for this group
Training protocol includes 10 water biking sessions in neutral water temperature (25°C) for this group
Change of the distance traveled (meter) on a Time Trial between pre and post training tests in hot and humid atmosphere (environmental room)
The participant has to perform the longer distance possible in 30 min on a stationary bike in hot and humid atmosphere (environmental room). The change of distance (measured in meter) will be assessed before and after the 2 weeks training program.
Time frame: The 1st Time Trial will be performed the week preceding the program training. The 2nd Time Trial will be performed the week following the program training
Change in VO2 Max (ml/kg/min) between pre and post training tests in normal environment
The participant has to perform a maximal cardiorespiratory test on a stationary bike in normal environment. The change in VO2 Max (measured in ml/kg/min) will be assessed before and after the 2 weeks training program.
Time frame: The 1st maximal cardiorespiratory test will be performed the week preceding the program training. The 2nd maximal cardiorespiratory test will be performed the week following the program training
Change in Maximal Aerobic Power (Watts) between pre and post training tests in normal environment
The participant has to perform a maximal cardiorespiratory test on a stationary bike in normal environment. The change in Maximal Aerobic Power (measured in Watts) will be assessed before and after the 2 weeks training program.
Time frame: The 1st maximal cardiorespiratory test will be performed the week preceding the program training. The 2nd maximal cardiorespiratory test will be performed the week following the program training
Change of "global longitudinal strain of left ventricule" (%) measured during an echocardiography between pre and post training tests in normal environment
The participant has to pass an echocardiography with specific measurment of "global longitudinal strain of left ventricule" (united in %). The change will be assessed before and after the 2 weeks training program.
Time frame: The 1st echocardiography will be performed the week preceding the program training. The 2nd echocardiography will be performed the week following the program training
Change on central temperature (°C) between pre and post training test in hot and humid atmosphere (environmental room)
Central temperature will be measured during Time Trial in hot and humid atmosphere (environmental room). The change on central temperature (measured in °C) will be assessed before and after the 2 weeks training program.
Time frame: The 1st Time Trial will be performed the week preceding the program training. The 2nd Time Trial will be performed the week following the program training
Change on cutaneours temperature (°C) between pre and post training test in hot and humid atmosphere (environmental room)
Cutaneous temperature will be measured during Time Trial in hot and humid atmosphere (environmental room). The change on cutaneours temperature (measured in °C) will be assessed before and after the 2 weeks training program.
Time frame: The 1st Time Trial will be performed the week preceding the program training. The 2nd Time Trial will be performed the week following the program training
Change of Na concentration (mmol/L) in the sweat between pre and post training test in hot and humid atmosphere (environmental room)
Sweat quality will be measured during Time Trial in hot and humid atmosphere (environmental room). The change of Na concentration (measured in mmol/l) will be assessed before and after the 2 weeks training program.
Time frame: The 1st Time Trial will be performed the week preceding the program training. The 2nd Time Trial will be performed the week following the program training
Change of body weight loss (Kg) between pre and post training test in hot and humid atmosphere (environmental room)
Body weight loss will be measured before and after Time Trial in hot and humid atmosphere (environmental room). The change of the body weight (measured in Kg) will be assessed between before and after the 2 weeks training program.
Time frame: The 1st measure of body weight will be performed the week preceding the program training. The 2nd measure of body weight will be performed the week following the program training
Change of Sleep quality between the first and the last training session of water biking
Sleep quality will be measured after the first and the last training session using a specific sleep self-questionnaire (PSQI) to detect the effect of hot or neutral water training during the 2 weeks training program. PSQI : Pittsburgh Sleep Quality Index. Qualitative questionnaire, no score measured.
Time frame: The sleep self-questionnaire will be performed immediately after the first training session (Day 1) and immediately after the last training session (Day 10) of water biking
Change of force/velocity power (N/m) between pre and post training test
The participant has to perform a maximal force/velocity test to measure the force/velocity power on a specific fitness testing cycle (Monark 818 E). The change of force/velocity power (measured in N/m) will be assessed between before and after the 2 weeks training program.
Time frame: The 1st measure of force/velocity power will be performed the week preceding the program training. The 2nd measure of force/velocity power will be performed the week following the program training
Change of sytemic low grade inflammation (CRP = C-Reactive Protein, mg/l) between pre and post training test
A blood test will be performed to measure the change of CRP concentration (measured in mg/l) between before and after the 2 weeks training program.
Time frame: The 1st measure of CRP will be performed the week preceding the program training. The 2nd measure of CRP will be performed the week following the program training
Change of haematocrit (%) between pre and post training test
A blood test with complete blood count will be performed to measure the change of haematocrit (which is expressed in %) between before and after the 2 weeks training program.
Time frame: The 1st measure of haematocrit will be performed the week preceding the program training. The 2nd measure of haematocrit will be performed the week following the program training
Change of hemoglobin level (g/100ml) between pre and post training test
A blood test with complete blood count will be performed to measure the change of hemoglobin level (measured in g/100ml) between before and after the 2 weeks training program.
Time frame: The 1st measure of hemoglobin level will be performed the week preceding the program training. The 2nd measure of hemoglobin level will be performed the week following the program training
Change of Rate of Perceived Effort (RPE) on a Time Trial between pre and post training tests
The Borg Rating of Perceived Exertion (RPE) will be used to measure physical activity intensity level. The scale is from 6 to 20. The higher the score is, the higher the perception of effort is. RPE will be measured after the first Time Trial and after the second Time Trial (post training protocol).
Time frame: The 1st Time Trial will be performed the week preceding the program training. The 2nd Time Trial will be performed the week following the program training
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University Hospital, Montpellier