Is Sodium Supplementation Necessary to Avoid Dehydration During Prolonged Exercise in the Heat? An American group has studied at a 100 miles run if sodium supply can prevent dehydration. At temperatures up to 39 ° C, the weight was determined as well as calculated by questionnaires the supply of liquid and sodium.
The researchers came to the conclusion that a sodium supply has no influence on the hydration of the runners. The whole study can be read below https://pubmed.ncbi.nlm.nih.gov/26907835/