Worker heat stress prevention and work metabolism estimation: comparing two assessment methods of the heart rate thermal component
Practitioner summary: We compared two methods for assessing the heart rate thermal component ([Inline formula]), which is needed to produce a corrected HR profile for estimating work metabolism (WM). Both methods yielded similar [Inline formula] estimates that allowed accurate estimations of heat stress and WM at the group level, but they were imprecise at the individual level.
Abbreviations: AIC: akaike information criterion; bpm: beats per minute; CI: confidence intervals; CV: coefficient of variation in %; CV drift: cardiovascular drift; ΔHRT: the heart rate thermal component in bpm; ΔHRT: the heart rate thermal component in bpm; ΔΔHRT: variation in the heart rate thermal component in bpm; ΔTC: variation in core body temperature in °C; HR: heart rate in bpm; HRmax: maximal heart rate in bpm; Icl: cloting insulation in clo; KAMP: Kampmann et al. (2001) method to determe ΔHRT; LoA: Limits of Agreement; PMV-PPD: the Predicted Mean Vote and Predicted Percentage Dissatisfied; PHS: Predicted Heat Strain model; RCM: random coefficients model; SD: standard deviation; TC: core body temperature in °C; TCR: thermal cardiac reactivity in bpm °C−1; τΔHRT: rate of change in the heart rate thermal component in bpm min−1; τTC: rate of change in core body temperature in °C min−1; tα,n-1: Student’s t statistic with level of confidence alpha and n−1 degrees of freedom; TWL: Thermal Work Limit model; [Inline formula]: oxygen consumption in ml O2 kg−1 min−1; [Inline formula] max: maximal oxygen consumption in ml O2 kg−1 min−1; VOGT: Vogt et al. (1973) method to determine ΔHRT; WBGT: Wet-Bulb Globe Temperature in °C; WM: work metabolism
Document Type: Research Article
Affiliations: 1: Department of Mathematics and Industrial Engineering, Polytechnique Montréal, Montréal, Canada; 2: Ministère des Forêts, de la Faune et des Parcs, Direction de la recherche forestière, Québec, Canada
Publication date: August 3, 2019