Abstract
The aim of the article is to present an overview of scientific research concerning changes od heart rate during stay in the aquatic environment and to analyze causes of these changes. A literature search was performed using sportDiscus, Medline and Web of Science using the key words heart rate, water temperature, water immersion, bradycardia.
The individual heart rate during immersion and exercise in water affected by water temperature, depth of the water, buoyancy, posture of the body in the water, thedive reflex and the deart rate in rest. Marked changes occur in the body's circulatory system and temperature regulating mechanisms, which subsequently influence other bodily functions.
The effect of the water environment begins immediately upon immersion, so physiological changes occur quickly.