Increased caloric intake soon after exercise in cold water

Area of Science:

• Exercise Physiology
• Thermoregulation
• Sports Nutrition

Background:

• Understanding the impact of environmental factors on post-exercise energy intake is crucial for optimizing energy balance.
• Aquatic exercise is a popular modality, but the specific effects of water temperature on subsequent energy consumption are not well-defined.

Purpose of the Study:

• To investigate the acute effect of cold-water temperature versus neutral temperature during exercise on post-exercise energy intake.
• To compare energy intake following exercise in cold water, neutral water, and a resting control condition.

Main Methods:

• A randomized crossover design was employed with 11 male participants.
• Exercise involved a 45-minute cycle ergometer session at 60% VO2max in either 20°C (cold) or 33°C (neutral) water.
• Energy expenditure was measured via indirect calorimetry, and energy intake was assessed through ad libitum food consumption post-intervention.

Main Results:

• Energy expenditure was comparable between cold and neutral water conditions.
• Energy intake following cold-water exercise was significantly higher (44% and 41%) compared to neutral water exercise and resting conditions, respectively.
• Cold water immersion during exercise stimulated greater subsequent energy consumption.

Conclusions:

• Cold-water temperature acutely stimulates post-exercise energy intake.
• Water temperature should be a key consideration in aquatic exercise programs aimed at weight loss.
• Further research could explore the physiological mechanisms driving this increased energy intake.