immediately after they wake up and before they get up, for
15 seconds each measurement, in order to calculate their
HRrest based in the average of the three measurements.
To adjust the intensity of effort to the water as suggested
by the Aquatic Exercise Association (AEA) 13 , seventeen
beats were reduced of maximum and minimum training
heart rate of each participants. Heart rate was measured
using a heart rate monitor Oregon Scientific HR102 mo-
del.