Reliability of the assessment of the oxygen/heart rate relationship during a workday.

The purpose of the present study was to evaluate the reliability of the oxygen consumption/heart rate (VO(2)/HR) relationship used to estimate energy expenditure during a workday. Before and after a 6-10 h work shift, the VO(2)/HR relationship was measured in 57 workers (28 female, 29 male) in our laboratory. VO(2) was similar before and after the shift at HR of 100 and 125 beats per minute (bpm). However, the VO(2)/HR relation and perceived exertion (RPE) became less accurate after a work shift as VO(2) and RPE were, respectively, increased at HR above 150 and 125 bpm. Increase of RPE for a same exercise intensity was higher in female subjects. Our results suggest good reliability of the VO(2)/HR relationship at HR usually found in workplaces.

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