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Water turnover and changes in body composition during arduous wildfire suppression.

Abstract

INTRODUCTION

Our lab has recently documented the total energy expenditure during arduous wildfire suppression using the doubly labeled water methodology. The elevated rates of isotopic elimination indicate an arduous working environment that may often compromise energy balance and overall hydration.

PURPOSE

The purpose of this investigation was to determine the effects of arduous wildfire suppression on water turnover and changes in body composition in wildland firefighters (WLFF).

METHODS

WLFF (N = 14) were studied during a 5-d period of arduous fire suppression work. A comparison group (N = 13) of recreationally active college students (RACS) was also studied. Water turnover was measured from rates of 2H elimination (rH2O). Urine osmolality, specific gravity, and skinfold measures were also collected.

RESULTS

WLFF demonstrated a decrease in nude body weight (pre = 71.9 +/- 10.4 kg, post = 70.9 +/- 10.2 kg, P = 0.0001) and total body water (pre = 42.9 +/- 7.2 kg, post = 42.0 +/- 6.7 kg, P = 0.0046). RACS maintained total body water and body weight during the experimental period. Isotope (2H2O) dilution demonstrated that rH2O was significantly higher for the WLFF (rH2O = 6.7 +/- 1.4 and 3.8 +/- 1.0 L.24 h-1 for the WLFF and RACS, respectively).

CONCLUSION

These results demonstrate an arduous work environment that threatens hydration, energy balance, and perhaps normal glycogen status.

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  • Authors+Show Affiliations

    ,

    Human Performance Laboratory, Department of Health and Human Performance, The University of Montana, Missoula, MT 59812-1825, USA. ruby@selway.umt.edu

    , , ,

    Source

    MeSH

    Body Water
    Female
    Fires
    Gravitation
    Humans
    Male
    Occupations
    Osmolar Concentration
    Physical Exertion
    Urine

    Pub Type(s)

    Journal Article
    Research Support, U.S. Gov't, Non-P.H.S.

    Language

    eng

    PubMed ID

    14523317

    Citation

    Ruby, Brent C., et al. "Water Turnover and Changes in Body Composition During Arduous Wildfire Suppression." Medicine and Science in Sports and Exercise, vol. 35, no. 10, 2003, pp. 1760-5.
    Ruby BC, Schoeller DA, Sharkey BJ, et al. Water turnover and changes in body composition during arduous wildfire suppression. Med Sci Sports Exerc. 2003;35(10):1760-5.
    Ruby, B. C., Schoeller, D. A., Sharkey, B. J., Burks, C., & Tysk, S. (2003). Water turnover and changes in body composition during arduous wildfire suppression. Medicine and Science in Sports and Exercise, 35(10), pp. 1760-5.
    Ruby BC, et al. Water Turnover and Changes in Body Composition During Arduous Wildfire Suppression. Med Sci Sports Exerc. 2003;35(10):1760-5. PubMed PMID: 14523317.
    * Article titles in AMA citation format should be in sentence-case
    TY - JOUR T1 - Water turnover and changes in body composition during arduous wildfire suppression. AU - Ruby,Brent C, AU - Schoeller,Dale A, AU - Sharkey,Brian J, AU - Burks,Catherine, AU - Tysk,Sonja, PY - 2003/10/3/pubmed PY - 2004/4/7/medline PY - 2003/10/3/entrez SP - 1760 EP - 5 JF - Medicine and science in sports and exercise JO - Med Sci Sports Exerc VL - 35 IS - 10 N2 - INTRODUCTION: Our lab has recently documented the total energy expenditure during arduous wildfire suppression using the doubly labeled water methodology. The elevated rates of isotopic elimination indicate an arduous working environment that may often compromise energy balance and overall hydration. PURPOSE: The purpose of this investigation was to determine the effects of arduous wildfire suppression on water turnover and changes in body composition in wildland firefighters (WLFF). METHODS: WLFF (N = 14) were studied during a 5-d period of arduous fire suppression work. A comparison group (N = 13) of recreationally active college students (RACS) was also studied. Water turnover was measured from rates of 2H elimination (rH2O). Urine osmolality, specific gravity, and skinfold measures were also collected. RESULTS: WLFF demonstrated a decrease in nude body weight (pre = 71.9 +/- 10.4 kg, post = 70.9 +/- 10.2 kg, P = 0.0001) and total body water (pre = 42.9 +/- 7.2 kg, post = 42.0 +/- 6.7 kg, P = 0.0046). RACS maintained total body water and body weight during the experimental period. Isotope (2H2O) dilution demonstrated that rH2O was significantly higher for the WLFF (rH2O = 6.7 +/- 1.4 and 3.8 +/- 1.0 L.24 h-1 for the WLFF and RACS, respectively). CONCLUSION: These results demonstrate an arduous work environment that threatens hydration, energy balance, and perhaps normal glycogen status. SN - 0195-9131 UR - https://www.unboundmedicine.com/medline/citation/14523317/Water_turnover_and_changes_in_body_composition_during_arduous_wildfire_suppression_ L2 - http://Insights.ovid.com/pubmed?pmid=14523317 DB - PRIME DP - Unbound Medicine ER -