Heart rate recovery improves after exercise in water when compared with on land.

BackgroundWater immersion has demonstrated its effectiveness in the recovery process after exercise. This study presents for the first time the impact of water immersion on heart rate recovery after low-intensity cycle exercise. MethodsSixteen male volunteers were involved in the study. The experiment consisted of two cycling exercises: 1h in ambient air and 1h in water (temperature: 3202 degrees C). The exercise intensity was individually prescribed to elicit around 35%-40% of VO2 peak for both conditions. Heart rate recovery was analysed according to recognized methods, such as the differences between heart rate at exercise completion and within the 2min recovery period. ResultsAlthough the two exercises were performed both at same energy expenditure and heart rate, the indexes used to assess the fast and slow decay of the heart rate recovery were significantly shortened after exercise in water. ConclusionThe results of the present study suggest that cycling in thermoneutral water decreases the cardiac work after exercise when compared with cycling on land.