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
Y1 - 2002
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.
AB - 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.
KW - Doubly labeled water
KW - Energy balance
KW - Energy expenditure periods
KW - Fire fighting
KW - Occupational physiology
UR - http://www.scopus.com/inward/record.url?scp=0036275531&partnerID=8YFLogxK
U2 - 10.1097/00005768-200206000-00023
DO - 10.1097/00005768-200206000-00023
M3 - Article
C2 - 12048336
AN - SCOPUS:0036275531
SN - 0195-9131
VL - 34
SP - 1048
EP - 1054
JO - Medicine and Science in Sports and Exercise
JF - Medicine and Science in Sports and Exercise
IS - 6
ER -