International Journal of Biometeorology

, Volume 26, Issue 2, pp 153–163 | Cite as

The effects of negative air ions on various physiological functions during work in a hot environment

  • O. Inbar
  • A. Rotstein
  • R. Dlin
  • R. Dotan
  • F. G. Sulman


The effects of negative air-ions on human physical performance has been investigated. Twenty-one healthy males, 20–25 years old (X=23.6±2.6) were exposed to two 180-min rest and exercise sessions two weeks apart. The subjects were randomly assigned into either an experimental group (n=12) or to a control group (n=9). The experimental group performed the first session in neutral air conditions and the second one in air containing 1.36 to 1.90×105 negative air ions and 1.40 to 1.66×102 positive air ions/ml. The control group performed both sessions under neutral air conditions. All sessions were held at Ta=40±1‡C and 25±5% RH. Each session included one hour of resting under the respective ionization conditions, followed by 3 30-min cycle ergometer work bouts, separated by 7-min rest periods. The mechanical work-load during the bicycle exercise was 1.64±0.6 W/kg BW. The experimental group showed a significant reduction with negative air-ions in heart rate (HR), in rectal temperature, and in the rating of perceived exertion (RPE), all when compared with their own neutral session. The control group showed no significant changes between the first and the second exposure. Although not statistically significant, being exposed to negative air-ions seems also to reduce total sweat rate and minute ventilation (VE), and to increase O2 pulse. It is suggested that under the conditions of this study negative air ions canimprove various cardiovascular and thermoregulatory functions as well as subjective feelings during physical effort. It is felt that such positive influences may be augmented by increasing the exposure time to negative ionized air and/or prolonging the stressful conditions.


Exercise Session Minute Ventilation Subjective Feeling Sweat Rate Bicycle Exercise 


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Copyright information

© Swets & Zeitlinger B.V. 1982

Authors and Affiliations

  • O. Inbar
    • 1
  • A. Rotstein
    • 1
  • R. Dlin
    • 1
  • R. Dotan
    • 1
  • F. G. Sulman
    • 1
    • 2
  1. 1.Department of Research and Sports MedicineThe Wingate InstituteJerusalem
  2. 2.Bioclimatology Unit, Medical CenterHebrew UniversityJerusalem

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