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Complete recovery time after exhaustion in high-intensity work

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This study was aimed to investigate complete recovery time (CRT) after exhaustion in high-intensity work. Twenty-four subjects were divided into two groups based on the cardiorespiratory capability index, which was measured in a maximum capacity test. Each subject then performed two cycling tests (at 60% and 70% maximum working capacity). The subject continued cycling until exhaustion in each test and then sat recovering until he/she no longer felt fatigue or until the oxygen uptake (VO2) and heart rate (HR) returned to their baselines, whichever was longer. The results indicated that HR required the longest time to recover and, consequently, HR data were adopted to set the CRT. The CRT was significantly correlated with the cardiorespiratory capability index and the relative workload indices: RVO2 and RHR. The RVO2 was the average elevation in VO2 during work from the resting level as a percentage of maximum VO2 reserve. The RHR's definition was similar to that of RVO2. Based on the obtained CRT-prediction model, the CRT for a high-cardiorespiratory-capability person was 20.8, 22.1, 23.4, and 24.7?min at 50%, 60%, 70%, and 80% RHR levels, respectively. These suggested CRT values should be increased by 10?min for a low-cardiorespiratory-capability person.
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Keywords: Exhaustion; Heart rate; High-intensity work; Oxygen uptake; Rest time

Document Type: Research Article

Affiliations: 1: Department of Industrial Engineering and Management, Chaoyang University of Technology, No.168, Jifong East Road, Wufong Township, Taiwan, Taichung County, 41349, Republic of China 2: Department of Occupational Safety and Health & Institute of Environmental Medicine, China Medical University, Taichung, Taiwan, 404, Republic of China 3: Department of Industrial Engineering and System Management, Feng Chia University, Taichung, Taiwan, 407, Republic of China

Publication date: May 15, 2005

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