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Total energy expenditure during arduous wildfire suppression.
Med Sci Sports Exerc 2002; 34(6):1048-54MS

Abstract

PURPOSE

The purpose of this investigation was to determine the total energy expenditure (TEE) by using the doubly labeled water (DLW) methodology during 5 d of wildfire suppression in Montana, California, Florida, Washington, and Idaho.

METHODS

Seventeen wildland firefighters (from three Interagency Hot Shot crews, N = 8 men, height = 177 +/- 7 cm, weight = 74.6 +/- 6.4 kg, age = 24.5 +/- 1.8 yr; N = 9 women, height = 170 +/- 7 cm, weight = 65.2 +/- 8.0 kg, age = 25.0 +/- 1.3 yr) served as subjects. Before wildland fire suppression, each subject was given an oral dose of 2H2O and H218O (approximately 0.23 g 2H2O.kg estimated TBW-1 and 0.39 g H218O.kg estimated TBW-1). Urine samples were collected between 0400 and 0600 daily. TEE was calculated using the two-point method for days 1-3 and 1-5, with the TEE for days 4-5 calculated by extrapolation. Urine samples from other crew members not participating in the DLW protocol were collected at the same times and used to adjust calculations of isotopic elimination for background shifts.

RESULTS

TEE was 17.4 +/- 3.7 and 17.5 +/- 6.9 MJ.d-1 during days 1-3 and 4-5, respectively. The energy expenditure associated with physical activity (EEA) was 8.8 +/- 3.0 and 8.9 +/- 6.1 MJ.d-1 for days 1-3 and 4-5, respectively.

CONCLUSION

The current data demonstrate consistently high daily energy expenditure in the wildland firefighter. These data also demonstrate that the doubly labeled water methodology is an appropriate methodology for the measure of TEE during unpredictable field operations if adjustments are made for changes in background enrichment and elevated water turnover.

Authors+Show Affiliations

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

Pub Type(s)

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

Language

eng

PubMed ID

12048336

Citation

Ruby, Brent C., et al. "Total Energy Expenditure During Arduous Wildfire Suppression." Medicine and Science in Sports and Exercise, vol. 34, no. 6, 2002, pp. 1048-54.
Ruby BC, Shriver TC, Zderic TW, et al. Total energy expenditure during arduous wildfire suppression. Med Sci Sports Exerc. 2002;34(6):1048-54.
Ruby, B. C., Shriver, T. C., Zderic, T. W., Sharkey, B. J., Burks, C., & Tysk, S. (2002). Total energy expenditure during arduous wildfire suppression. Medicine and Science in Sports and Exercise, 34(6), pp. 1048-54.
Ruby BC, et al. Total Energy Expenditure During Arduous Wildfire Suppression. Med Sci Sports Exerc. 2002;34(6):1048-54. PubMed PMID: 12048336.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Total energy expenditure during arduous wildfire suppression. AU - Ruby,Brent C, AU - Shriver,Tim C, AU - Zderic,Theodore W, AU - Sharkey,Brian J, AU - Burks,Catherine, AU - Tysk,Sonja, PY - 2002/6/6/pubmed PY - 2002/7/18/medline PY - 2002/6/6/entrez SP - 1048 EP - 54 JF - Medicine and science in sports and exercise JO - Med Sci Sports Exerc VL - 34 IS - 6 N2 - PURPOSE: The purpose of this investigation was to determine the total energy expenditure (TEE) by using the doubly labeled water (DLW) methodology during 5 d of wildfire suppression in Montana, California, Florida, Washington, and Idaho. METHODS: Seventeen wildland firefighters (from three Interagency Hot Shot crews, N = 8 men, height = 177 +/- 7 cm, weight = 74.6 +/- 6.4 kg, age = 24.5 +/- 1.8 yr; N = 9 women, height = 170 +/- 7 cm, weight = 65.2 +/- 8.0 kg, age = 25.0 +/- 1.3 yr) served as subjects. Before wildland fire suppression, each subject was given an oral dose of 2H2O and H218O (approximately 0.23 g 2H2O.kg estimated TBW-1 and 0.39 g H218O.kg estimated TBW-1). Urine samples were collected between 0400 and 0600 daily. TEE was calculated using the two-point method for days 1-3 and 1-5, with the TEE for days 4-5 calculated by extrapolation. Urine samples from other crew members not participating in the DLW protocol were collected at the same times and used to adjust calculations of isotopic elimination for background shifts. RESULTS: TEE was 17.4 +/- 3.7 and 17.5 +/- 6.9 MJ.d-1 during days 1-3 and 4-5, respectively. The energy expenditure associated with physical activity (EEA) was 8.8 +/- 3.0 and 8.9 +/- 6.1 MJ.d-1 for days 1-3 and 4-5, respectively. CONCLUSION: The current data demonstrate consistently high daily energy expenditure in the wildland firefighter. These data also demonstrate that the doubly labeled water methodology is an appropriate methodology for the measure of TEE during unpredictable field operations if adjustments are made for changes in background enrichment and elevated water turnover. SN - 0195-9131 UR - https://www.unboundmedicine.com/medline/citation/12048336/Total_energy_expenditure_during_arduous_wildfire_suppression_ L2 - http://Insights.ovid.com/pubmed?pmid=12048336 DB - PRIME DP - Unbound Medicine ER -