A convenient prediction model for complete recovery time after exhaustion in high-intensity work

We aimed to propose a convenient model for predicting complete recovery time (CRT) after exhaustion in high-intensity work. Before participating in the laboratory test, each of the 47 young adult subjects provided demographic information and filled out the perceived functional ability (PFA) and physical activity rating (PA-R) questionnaires. All subjects were required to perform one cycling test (at 70% maximum working capacity). Subjects continued cycling until exhaustion and then sat and recovered until their heart rates (HR) returned to baseline values. We found that CRT was significantly correlated with relative body mass index, the PFA score, PA-R score and maximum heart rate (HR max ). Accordingly, a prediction model for CRT was proposed. Furthermore, by replacing HR max with age-predicted maximal HR, we obtained a more convenient prediction model that was independent of any physiological indexes that can only be obtained by subject testing. Practitioner Summary: High-intensity work is associated with higher perceived fatigue, which can be alleviated after a rest period. Instead of complex laboratory testing, questionnaires were used to derive a convenient prediction model for CRT after exhaustion. Ergonomics should be incorporated into work-rest schedule planning to improve efficiency and safety.