Energy Balance of Triathletes during an Ultra-Endurance Event A Spanish group has studied the energy balance with Ironman triathlets. For swimming, cycling and running, energy consumption was calculated exactly.The 11 triathlets were around 755 minutes, had an average heart rate of 137 beats, raised around 3,600 kcal, spent around 10,000 kcal and came to a deficit of around 7,400 kcal.In addition, it came to a decrease in body weight and body water. All details can be found under https://www.mdpi.com/2072-6643/7/1/209