The role of fluid temperature and form on endurance performance in the heat If athletes burden in the heat, there is an increase in body core temperature. This can affect unhealthy and restrict performance.The supply of cool drinks can reduce the body core temperature before loading, but not during the load.
The temperature of a drink does not seem to have an influence on the stomach emptying and absorption in the intestine. The supply of a mixture of water and ice (ICE Slurry) seems to be very efficient to avoid an excessive increase in body core temperature and improve endurance performance in the heat. The work can be found under https://pubmed.ncbi.nlm.nih.gov/25943655/