Aquatic Therapy – Relevant Thermoregulatory Effects and Pregnancy
Clinical Review by Bruce E. Becker, MD, MS
The two major compensatory mechanisms that assist cooling in warm air temperatures are peripheral vasodilatation combined with increased cardiac output. These mechanisms work to counter purposes in warm water (greater than 37°C), because they facilitate heat gain when the surrounding environment does not allow evaporative and radiant cooling.
Immersion at 40°C (104°F), which is a common hot tub temperature, produces a rectal (core) temperature rise which equates to approximately 0.1°F/min of immersion