The influences of salt concentrations in sea water on ECG during and after bathing

DOI Web Site 18 References
  • MIYAJIMA Masae
    Sapporo School of the Arts
  • SHIMIZU T.
    Department of Living and Health Sciences, Joetsu University of Education
  • MORIYA K.
    Department of Health and Sports Science, Graduate School of Education, Hokkaido University
  • MIZUNO T.
    The Copenhagen Muscle Research Center, Department of Infectious Diseases, Rigshospitalet, University Hospital
  • ODA S.
    Department of Health and Sports Science, Graduate School of Education, Hokkaido University
  • AGISHI Y.
    School of Medicine, Hokkaido University

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Other Title
  • 人工海水温浴における塩類濃度が心電図に与える影響
  • ジンコウ カイスイ オンヨク ニ オケル エンルイ ノウド ガ シンデンズ ニ アタエル エイキョウ

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Abstract

The aim of this experiment is to gain data for making use of thalassotherapy in preserving and improving health. We investigated the effects of various salt concentrations on ECG findings during and after bathing in a salt water. The subjects were 6 healthy young males. At set times for four consecutive days the subjects bathed in the following water conditions: plain water; 1%, 3.5%, and 7% salt water concentrations. At the beginning of bathing, the temperature of the water was set at 38.20∼38.33°C in each salt water concentration. The subjects bathed for 15 minutes and then rested in a chair for 30 minutes. While bathing, the mean heart rate of the subjects in all four conditions increased significantly. However, after bathing, a significant increase of heart rate was observed only in the 7% salt water bath during first 4-7 minutes. A significant decrease was found in the mean CVR-R in all of the salt water bathing, but after bathing, a significant decrease was found only in the 7% salt water bath. It was also observed that the mean LF/HF in the 1% salt water bath increased significantly during an 11-14 minute bathing period. The above results show that salt water bathing, especially that in a concentration of 7%, has a greater influence on the cardiovascular system and the autonomic nervous system than plain water bathing.

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