Chen W.-CTserng H.P.HUI-PING TSERNG2022-03-222022-03-22202209265805https://www.scopus.com/inward/record.uri?eid=2-s2.0-85119472659&doi=10.1016%2fj.autcon.2021.104051&partnerID=40&md5=82336059257479da0af9c9cd0cd53338https://scholars.lib.ntu.edu.tw/handle/123456789/598465This study proposes the concept of the field resting heart rate (FRHR) and aims to approach the practical workload of workers at construction worksites using the percentage of heart rate reserve (%HRR). As part of this study, an FRHR algorithm has been developed, which accesses the real-time resting heart rate (RHR) benchmark using photoplethysmography (PPG)-based heart rate wristbands. The results suggest a reasonable FRHR can be extracted by a single minimum working heart rate and refined for five days at least to obtain a convergence FRHR of below three bites per minute (bpm). It provides the %HRR baseline to develop a continuous long-term personalized workload indicator. The study also establishes the individual physical workload safety zone and the reasonable boundaries on the S-curve distribution by accumulative working time in a tunnel project. The real-time monitoring system introduced in this study can reduce health risks and be beneficial to construction management. ? 2021Field resting heart rate (FRHR)Photoplethysmography (PPG)Resting heart rate (RHR)The percentage of heart rate reserve (%HRR)WorkloadHealth risksPhotoplethysmographyProject managementField resting heart rateHeart-rateReal- timeResting heart rateThe percentage of heart rate reserveWork sitesHeart[SDGs]SDG3journal article10.1016/j.autcon.2021.1040512-s2.0-85119472659