© 1993 by Thieme Medical Publishers, Inc.
Thermoregulation of Pregnant Women During Aerobic Exercise on Land and in the Water
04 March 2008 (online)
Seven women in their 25th week of pregnancy exercised for 20 minutes on a cycle ergometerat 70% of their maximal heart rate on land and in the water (30°C) to compare thermoregulatory responses. Rectal temperatures increased 0.5 ± 0.1°C during the land trial and only 0.2 ± 0.1°C during the water trial (p <0.05). Mean body temperature rose 0.6 ± 0.2°C during the land trial, but declined -0.3 ± 0.1°C during the water trials (p <0.05). Land exercise caused greater heat storage and sweat loss. The results suggest that normal pregnant women can maintain thermal balance during 20 minutes of exercise at 70% maximal heart rate, whether on land or in the water. Thus, for normal, average fit, pregnant women who wish to participate in a moderate exercise program, heat stress is probably not a major concern.