Water Exercise and Health (WATHEALTH) (WATHEALTH)

Effect of Water Temperature on Energy Response During Aquatic Cycling in Women: Impact of Weight Status

Aquatic cycling is becoming more popular as it appears to be more suitable for men and women even with poor physical activity level. Commercial tagline highlight beneficial effect of this activity on weight management. However there are poor information concerning the energy response induced by this activity. The aim of this project is to investigate effect of water temperature on energetic response (energy expenditure and food intake) of cycling exercise in water in normal weight and overweight premenopausal women.

After inclusion visit, all subject will be submitted to DXA to obtain body composition data. Then subjects will be submitted to four experimental session in a semi-randomized order. For all those session, subjects will take a standardized breakfast (570kcal) three hours before experimental session. Control session (CON): subject will stand sited without any activity during 40 min. Subjects will be submitted to three aquatic cycling exercise session: session 27°C :aquatic cycling at 27°C without water jet during 40 min session 27°C+ water jets : aquatic cycling at 27 °C with water jets during 40 min session 18°C : aquatic cycling at 187°C without water jet during 40 min Every exercise session will be set at 70% of theorical maximal heart rate During each session, oxygen consumption and carbon dioxide production will be analysed with gas analysis system. Appetite and hunger sensation will be measured with a specific scale at different time point of each day of experimental session. Thirty minutes after the end of each experimental session subjects will have a buffet meal for lunch time.

For all those session, subjects will take a standardized breakfast (570kcal) three hours before experimental session. Control session (CON): subject will stand sited without any activity during 40 min. Subjects will be submitted to three aquatic cycling exercise session: session 27°C :aquatic cycling at 27°C without water jet during 40 min session 27°C+ water jets : aquatic cycling at 27 °C with water jets during 40 min session 18°C : aquatic cycling at 187°C without water jet during 40 min Every exercise session will be set at 70% of theorical maximal heart rate During each session, oxygen consumption and carbon dioxide production will be analysed with gas analysis system. Appetite and hunger sensation will be measured with a specific scale at different time point of each day of experimental session. Thirty minutes after the end of each experimental session subjects will have a buffet meal for lunch time.

using Borg scale perceived exertion will be evaluated between 6 (very light) and 20 (extremely difficult)

using Borg scale perceived exertion will be evaluated between 6 (very light) and 20 (extremely difficult)

using Borg scale perceived exertion will be evaluated between 6 (very light) and 20 (extremely difficult)

using Borg scale perceived exertion will be evaluated between 6 (very light) and 20 (extremely difficult)

Inclusion Criteria: Women aged between 20 and 40 years BMI under 25kg.m2 for normal weight women and between 25 and 29,9 kg.m2 for overweight women Daily breakfast Subject which approved informed consent Subject with French medical affiliation Exclusion Criteria: Specific medical treatment Aquaphobia Subject under specific diet regimen or weight loss program Subject with cardio-vascular disease Surgical intervention less than 3 months Subject refusing informed and written consent Subject without French medical affiliation subject refusing inscription to the national voluntary list subject being in an exclusion period subject smoking or drinking alcohol frequently subject with intense physical activity