Recognize that water's cooling effect may result in heart rates that are about 10 to 15 beats lower when exercising in water compared with the same effort on land.
(heart rates; are; about 10 to 15 beats lower; T:when exercising in water compared with the same effort on land)
heart rates
are
about 10 to 15 beats lower T:when exercising in water compared with the same effort on land