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The purpose of this study was to investigate blood pressure and muscle oxygen dynamics in a rest cold water immersion by using 9 healthy men. The water temperature that we used was 20°C, 25°C, and 30°C in the 15-min-water-immersion tests on sitting posture. As a result, the systolic arterial pressure immediately after immersion was higher than rest value with all conditions. However, only 30°C condition reached a low value after five minutes of the immersion. The diastolic pressure increased by the immersion in 20°C and 25°C condition. On the other hand, diastolic pressure decreased in 30°C condition. Total hemoglobin and deoxy-hemoglobin decreased at the water immersion compared with rest value. In all condition, oxy- hemoglobin was decreased immediately after immersion compared with rest value. There was great difference between 30°C and, 25°C and 20°C, for blood pressure and muscle O2 dynamics. In the conclusion, when the water temperature was 30°C, the cold pressor response was not seen and it was thought that the decreased blood pressure is caused by hydraulic pressure.

Examination for blood pressure and leg muscle oxygen dynamics during cold water immersion