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Comparison of Conventional and Individualized 1-MET Values for Expressing Maximum Aerobic Metabolic Rate and Habitual Activity Related Energy Expenditure.

  • Heydenreich J Swiss Federal Institute of Sport Magglingen, 2532 Magglingen, Switzerland. juliane.heydenreich@gmail.com.
  • Schutz Y Department of Physiology, University of Fribourg, 1700 Fribourg, Switzerland. yves.schutz@unifr.ch.
  • Melzer K Swiss Federal Institute of Sport Magglingen, 2532 Magglingen, Switzerland. katarinamelzer@hotmail.com.
  • Kayser B Institute of Sport Sciences, University of Lausanne, 1015 Lausanne, Switzerland. bengt.kayser@unil.ch.
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  • 2019-03-01
Published in:
  • Nutrients. - 2019
endurance athletes
energy expenditure
maximum oxygen consumption
resting metabolic rate
Adult
Energy Metabolism
Exercise
Female
Humans
Male
Oxygen Consumption
Sex Characteristics
English The maximum aerobic metabolic rate can be expressed in multiple metabolically equivalent tasks (MET), i.e., METmax. The purpose was to quantify the error when the conventional (3.5 mL∙kg-1∙min-1) compared to an individualized 1-MET-value is used for calculating METmax and estimating activity energy expenditure (AEE) in endurance-trained athletes (END) and active healthy controls (CON). The resting metabolic rate (RMR, indirect calorimetry) and aerobic metabolic capacity (spiroergometry) were assessed in 52 END (46% male, 27.9 ± 5.7 years) and 53 CON (45% male, 27.3 ± 4.6 years). METmax was calculated as the ratio of VO₂max over VO₂ during RMR (METmax_ind), and VO₂max over the conventional 1-MET-value (METmax_fix). AEE was estimated by multiplying published MET values with the individual and conventional 1-MET-values. Dependent t-tests were used to compare the different modes for calculating METmax and AEE (α = 0.05). In women and men CON, men END METmax_fix was significantly higher than METmax_ind (p < 0.01), whereas, in women END, no difference was found (p > 0.05). The conventional 1-MET-value significantly underestimated AEE in men and women CON, and men END (p < 0.05), but not in women END (p > 0.05). The conventional 1-MET-value appears inappropriate for determining the aerobic metabolic capacity and AEE in active and endurance-trained persons.
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  • English
Open access status
gold
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https://folia.unifr.ch/global/documents/130547
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