Effects of immersion in water containing high concentrations of CO 2 (CO2-water) at thermoneutral on thermoregulation and heart rate variability in humans

Maki Sato, Dominika Kanikowska, Satoshi Iwase, Naoki Nishimura, Yuuki Shimizu, Eric Jacques Belin de Chantemele, Takaaki Matsumoto, Yoko Inukai, Yumiko Taniguchi, Akihiro Ogata, Junichi Sugenoya

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Immersion in high concentrations of CO2 dissolved in freshwater (CO2-water) might induce peripheral vasodilatation in humans. In this study, we investigated whether such immersion could affect the autonomic nervous system in humans using spectral analysis of heart rate variability. Ten healthy men participated in this study. Tympanic temperature, cutaneous blood flow and electrocardiogram (ECG) were measured continuously during 20 min of immersion in CO2-water. The ECG was analyzed by spectral analysis of R-R intervals using the maximal entropy method. The decrease in tympanic temperature was significantly greater in CO2-water immersion than in freshwater immersion. Cutaneous blood flow at the immersed site was significantly increased with CO2-water immersion compared to freshwater. The high frequency component (HF: 0.15-0.40 Hz) was significantly higher in CO2-water immersion than in freshwater immersion, but the low frequency (LF: 0.04-0.15 Hz) /high frequency ratio (LF/HF ratio) was significantly lower in CO2-water immersion than in freshwater immersion. The present study contributes evidence supporting the hypothesis that CO2-water immersion activates parasympathetic nerve activity in humans.

Original languageEnglish (US)
Pages (from-to)25-30
Number of pages6
JournalInternational Journal of Biometeorology
Volume53
Issue number1
DOIs
StatePublished - Jan 1 2009
Externally publishedYes

Fingerprint

thermoregulation
Body Temperature Regulation
Immersion
Carbon Monoxide
Heart Rate
Water
Fresh Water
water
spectral analysis
blood
Electrocardiography
nervous system
rate
effect
entropy
Skin
Temperature
temperature
Autonomic Nervous System
Entropy

Keywords

  • CO-water immersion
  • Spectrum analysis
  • Thermoregulation

ASJC Scopus subject areas

  • Ecology
  • Atmospheric Science
  • Health, Toxicology and Mutagenesis

Cite this

Effects of immersion in water containing high concentrations of CO 2 (CO2-water) at thermoneutral on thermoregulation and heart rate variability in humans. / Sato, Maki; Kanikowska, Dominika; Iwase, Satoshi; Nishimura, Naoki; Shimizu, Yuuki; Belin de Chantemele, Eric Jacques; Matsumoto, Takaaki; Inukai, Yoko; Taniguchi, Yumiko; Ogata, Akihiro; Sugenoya, Junichi.

In: International Journal of Biometeorology, Vol. 53, No. 1, 01.01.2009, p. 25-30.

Research output: Contribution to journalArticle

Sato, Maki ; Kanikowska, Dominika ; Iwase, Satoshi ; Nishimura, Naoki ; Shimizu, Yuuki ; Belin de Chantemele, Eric Jacques ; Matsumoto, Takaaki ; Inukai, Yoko ; Taniguchi, Yumiko ; Ogata, Akihiro ; Sugenoya, Junichi. / Effects of immersion in water containing high concentrations of CO 2 (CO2-water) at thermoneutral on thermoregulation and heart rate variability in humans. In: International Journal of Biometeorology. 2009 ; Vol. 53, No. 1. pp. 25-30.
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