Reliability of low-power cycling efficiency in energy expenditure phenotyping of inactive men and women

Physiological Reports
Elie-Jacques FaresAbdul G Dulloo

Abstract

Standardized approaches to assess human energy expenditure (EE) are well defined at rest and at moderate to high-intensity exercise, but not at light intensity physical activities energetically comparable with those of daily life (i.e., 1.5-4 times the resting EE, i.e., 1.5-4 METs). Our aim was to validate a graded exercise test for assessing the energy cost of low-intensity dynamic work in physically inactive humans, that is, those who habitually do not meet the guidelines for moderate-to-vigorous aerobic physical activity levels. In healthy and inactive young men and women (n = 55; aged 18-32 years), EE was assessed in the overnight-fasted state by indirect calorimetry at rest and during graded cycling between 5 and 50W for 5 min at each power output on a bicycle ergometer. Repeatability was investigated on three separate days, and the effect of cadence was investigated in the range of 40-90 rpm. Within the low power range of cycling, all subjects perceived the exercise test as "light" on the Borg scale, the preferred cadence being 60 rpm. A strong linearity of the EE-power relationship was observed between 10 and 50 W for each individual (r > 0.98), and the calculation of delta efficiency (DE) from the regression slope indic...Continue Reading

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Citations

Jul 12, 2017·Frontiers in Physiology·Jennifer L Miles-Chan, Abdul G Dulloo
Jun 12, 2019·Sports Medicine - Open·Pekka MatomäkiHeikki Kyröläinen
Sep 4, 2018·Frontiers in Physiology·Daniele A CardinaleRobert Boushel

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