Body composition and hydration status changes in male and female open-water swimmers during an ultra-endurance event. In general, the opinion is represented that subcutaneous fat is reduced with swimming.Since a large muscle mass is moved and in the mostly cool water due to the cold additional fat should be consumed, it must lead to a degradation of fat. We studied 20 men and 11 women at the marathon swimming in Zurich, which happens after around 27 km swimming with regard to the fatty tissue. While the men accepted weight and muscle mass, nothing happened to the women. The results in detail under https://pubmed.ncbi.nlm.nih.gov/22554315/