Proceedings of Annual Meeting of the Physiological Society of Japan
Proceedings of Annual Meeting of the Physiological Society of Japan
Session ID : 3O-17H8
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Effect of CO2 water immersion on cardiac autonomic nerve function in humans
*Maki SatoYuuki ShimizuSatoshi IwaseNaoki NishimuraTakaaki MatsumotoYoko InukaiAkihiro OgataYumiko TaniguchiHiroki TakadaJunichi Sugenoya
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Abstract
CO2 water immersion at 1000 ppm affects thermoregulation through the increased cutaneous blood flow on the immersed skin area. However, the effect of CO2 water immersion on cardiovascular function remains to be clarified in humans. To examine whether CO2 bathing affects cardiac autonomic function, we analyzed heart rate variability and measured the cardiac output by Echo (Apio XV, Toshiba, Japan) during CO2 and fresh water immersion. Tympanic temperature (thermistor thermometry), cutaneous blood flow (laser-Doppler flowmetry) and electrocardiogram (ECG) were monitored continuously. The subjective thermal and comfort sensations were asked every 10-min during experiments. After a rest for 10 min, the subject immersed up to the breast level to CO2-rich water at 1000ppm or fresh water at thermoneutral water. The results were shown as follows: 1) HF was significantly higher in CO2 water immersion than in fresh water immersion. 2) LF/HF ratio was significantly lower in CO2 water immersion than in fresh water immersion. 3) Heart rate was not significantly different between CO2 water and fresh water immersion. 4) Tympanic temperature was significantly lower during CO2 water immersion than during fresh water immersion. 5) Cutaneous blood flow in immersed forearm was significantly higher during CO2 water immersion than during fresh water immersion. [J Physiol Sci. 2006;56 Suppl:S96]
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© 2006 The Physiological Society of Japan
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