Irrigation on High-Temperature Days - Isotonic Fluid or Water?
Katarzyna Mazur
2026-03-24
6 min. read
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Our body, when exposed to high temperatures, activates its protective mechanisms, including the production of more sweat... Along with sweat, we lose water and minerals essential for the proper functioning of our body... In order to replenish these losses and at the same time avoid the negative effects of dehydration, it is important to ensure an adequate supply of fluids.
Percentage water content in the human body
The human body is largely composed of water, with its percentage content varying with age and being dependent on many factors. The body of a newborn is made up of up to 75% water, the largest amount of water being lost in the first year of life. It is assumed that water makes up an average of 50-70% of an adult's body weight, with the amount decreasing as he ages. In a man after 60 years of age it will be 54%, and in a woman - 46%. Water content also depends on body composition, more precisely on body fat mass and fat tissue. Water makes up less than 30% of fat tissue and 70-80% of fat-free mass. The more muscle tissue a person possesses, the more water is found in their tissues (I. Idasiak-Piechocka 2011). Water is essential for the proper functioning of the body. A person can survive without food for about a month, but without water - only a few days (B. Łubkowska 2016). Water forms the milieu for metabolic changes, participates in the transport of substances, and affects proper temperature regulation.
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