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Anatomy, Biomechanics, Work Physiology, and Anthropometry
Published in Stephan Konz, Steven Johnson, Work Design, 2018
Heart rate can be estimated by asking a person for his/her rating of perceived exertion (RPE). The scale is a column of numbers from 6 to 20. The person votes his/her perceived exertion as a number, using accompanying words for guidance; the heart rate is estimated by multiplying the rating by 10. For example, the words accompanying level 9 are “Very light” and the word with 11 is “Light.” If the person identifies his/her exertion as “Light,” the heart rate would be estimated as 10(11) = 110 beats/min. The concept has been validated by many experimenters for many tasks. Ljunggren (1986) reported it is not even necessary to have the individual’s own perceived exertion—the exertion can be estimated by an observer.
Investigating the Use of Changes in Facial Features as Indicators of Physical Workload
Published in IISE Transactions on Occupational Ergonomics and Human Factors, 2023
Physical workload is typically assessed through self-reported exertion or physiological measurements by wearable sensors, but there are limitations to these approaches for use in the field. Self-reported values, such as the rating of perceived exertion (RPE) (Borg, 1998), have been commonly used to assess physical workload. However, the collection of these ratings may interrupt workers (Yan et al., 2020) and induce an added mental workload. Workers can also only be queried at intervals, which limits the collection of real-time data. Ergonomic assessment tools, such as the Strain Index (Moore & Garg, 1995), have also been widely applied to quantify physical exposure based on observations by ergonomists. Observer assessments are subject to error, which can lead to large variance in data (Burghardt et al., 2012). Expert observers may have fewer errors and lower bias compared to those without training.
The relationship between ratings of perceived exertion (RPE) and relative strength for a fatiguing dynamic upper extremity task: A consideration of multiple cycles and conditions
Published in Journal of Occupational and Environmental Hygiene, 2023
Zahra Vahedi, Setareh Kazemi Kheiri, Sahand Hajifar, Saeb Ragani Lamooki, Hongyue Sun, Fadel M. Megahed, Lora A. Cavuoto
Instead, physical fatigue assessments in the workplace often rely on ratings of perceived exertion (RPE) (e.g., Borg 6–20 or Borg CR-10 scales). The use of RPE scales for occupational physical fatigue measurement can be justified by Borg (1982): (a) their ease of use, (b) their ability to “integrat[e] various information, including the many signals elicited from the peripheral working muscles and joints, from the central cardiovascular and respiratory functions, and from the central nervous system” (377), and (c) their high correlations with heart rate and other physiological variables. More recently, RPEs have been used, as response variables, to assess whether wearable sensors (e.g., IMUs) can be used to model/monitor/predict physical fatigue at the workplace (Sedighi Maman et al. 2017; Baghdadi et al. 2018; Maman et al. 2020; Hajifar et al. 2021; Lamooki et al. 2022).
Running economy and effort after cycling: Effect of methodological choices
Published in Journal of Sports Sciences, 2020
Chantelle du Plessis, Anthony J. Blazevich, Chris Abbiss, Jodie Cochrane Wilkie
After a 5-min warm-up at a self-selected intensity on the cycle ergometer, participants performed an incremental cycling test to exhaustion. The test commenced at 160 W and increased by 5 W every 15 s at a freely chosen cycling cadence until voluntary exhaustion or until the participant’s cadence dropped below 70 rpm. Ventilation rate (V̇E) and expired gas concentrations were recorded breath-by-breath throughout the test using a metabolic cart system (ParvoMedics TrueOne 2400 diagnostic system, USA) and analysed as 15-s averages. The participant’s heart rates and ratings of perceived exertion (RPE) were recorded every minute using a Polar heart rate monitor (RS800 Polar Heart Rate Monitor, Finland) and Borg’s 15 point scale (6–20 point scale), respectively. V̇O2max was defined as the highest V̇O2 value averaged across a 1-min period and MAP was defined as the average of the highest consecutive power output sustained for 1 min (Etxebarria, Anson, et al., 2014).