Ten male firefighters were tested on a treadmill to determine their heart rate (HR) × oxygen consumption (VO2) relationship. These men then performed a simulated fire suppression protocol during which HR and VO2 were measured m simultaneously by a protable physiological monitoring system. Average VO2 in the simulated setting was 31.0±7.0ml-kg−1-min−1 at a HR of 176 ±9 bpm. This VO2 was significantly (p≤0.05) less than the VO2 that would have been predicted by treadmill testing (38.9 ± 5.0ml kg−1, min−1) at a corresponding HR. Fifty-nine per cent of this variability could be accounted for by regression analysis. Firefighters worked on average at 73 ± 10% VO2 max with a range of 54% to 88%. There was a significant (-0.82; p≤0.05) inverse relationship between performance time of the fire suppression protocol and the relative intensity of VO2 max at which the firefighters worked. These findings indicate that the prediction of energy expenditure from HR is not straightforward in fire suppression settings. Furthermore, the relative intensity of work firefighters self-select is variable and should be considered as an additional physiological determinant of work behaviour.
|Original language||English (US)|
|Number of pages||6|
|State||Published - Dec 1991|
All Science Journal Classification (ASJC) codes
- Human Factors and Ergonomics
- Physical Therapy, Sports Therapy and Rehabilitation