European Journal of Applied Physiology

, Volume 111, Issue 12, pp 3097–3105 | Cite as

Thermal face protection delays finger cooling and improves thermal comfort during cold air exposure

  • Catherine O’Brien
  • John W. Castellani
  • Michael N. Sawka
Original Article

Abstract

When people dress for cold weather, the face often remains exposed. Facial cooling can decrease finger blood flow, reducing finger temperature (T f). This study examined whether thermal face protection limits finger cooling and thereby improves thermal comfort and manual dexterity during prolonged cold exposure. T f was measured in ten volunteers dressed in cold-weather clothing as they stood for 60 min facing the wind (−15°C, 3 m s−1), once while wearing a balaclava and goggles (BAL), and once with the balaclava pulled down and without goggles (CON). Subjects removed mitts, wearing only thin gloves to perform Purdue Pegboard (PP) tests at 15 and 50 min, and Minnesota Rate of Manipulation (MRM) tests at 30 and 55 min. Subjects rated their thermal sensation and comfort just before the dexterity tests. T f decreased (p < 0.05 for time × trial interaction) by 15 min of cold exposure during CON (33.6 ± 1.4–28.7 ± 2.0°C), but not during BAL (33.2 ± 1.4–30.6 ± 3.2°C); and after 30 min T f remained warmer during BAL (23.3 ± 5.9°C) than CON (19.2 ± 3.5); however, by 50 min, T f was no different between trials (14.1 ± 2.7°C). Performance on PP fell (p < 0.05) by 25% after 50 min in both trials; MRM performance was not altered by cold on either trial. Subjects felt colder (p < 0.05) and more uncomfortable (p < 0.05) during CON, compared to BAL. Thermal face protection was effective for maintaining warmer T f and thermal comfort during cold exposure; however, local cooling of the hands during manual dexterity tests reduced this physiological advantage, and performance was not improved.

Keywords

Reflex vasoconstriction Heat loss Thermal sensation 

Notes

Acknowledgments

We are sincerely grateful to the volunteers who participated in this study. Many thanks are also due to Mr. Lenny Elliott, Mr. Thomas Endrusick, and Mr. Vincent Forte, Jr., for their technical expertise and assistance.

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag (outside the USA) 2011

Authors and Affiliations

  • Catherine O’Brien
    • 1
  • John W. Castellani
    • 1
  • Michael N. Sawka
    • 1
  1. 1.Thermal and Mountain Medicine DivisionU.S. Army Research Institute of Environmental MedicineNatickUSA

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