Errors in MET Estimates of Physical Activities Using 3.5 ml·kg−1·min−1 as the Baseline Oxygen Consumption

Kozey, Sarah; Lyden, Kate; Staudenmayer, John; Freedson, Patty

doi:10.1123/jpah.7.4.508

Cited by 119Physical Activity and HealthCardiovascular and exercise physiologyObesity, Physical Activity, Diet

Errors in MET Estimates of Physical Activities Using 3.5 ml·kg−1·min−1 as the Baseline Oxygen Consumption

Kozey, Sarah, Lyden, Kate, Staudenmayer, John, Freedson, Patty·2010·Journal of Physical Activity and Health

DOI 10.1123/jpah.7.4.508

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Abstract

Purpose: To compare intensity misclassification and activity MET values using measured RMR (measMET) compared with 3.5 ml·kg−1·min−1 (standMET) and corrected METs [corrMET = mean standMET × (3.5 ÷ Harris-Benedict RMR)] in subgroups. Methods: RMR was measured for 252 subjects following a 4-hr fast and before completion of 11 activities. VO 2 was measured during activity using indirect calorimetry (n = 2555 activities). Subjects were classified by BMI category (normal-weight or overweight/obese), sex, age (decade 20, 30, 40, or 50 y), and fitness quintiles (low to high). Activities were classified into low, moderate, and vigorous intensity categories. Results: The (mean ± SD) measMET was 6.1 ± 2.64 METs. StandMET [mean (95% CI)] was (0.51(0.42, 0.59) METs) less than measMET. CorrMET was not statistically different from measMET (−0.02 (−0.11, 0.06) METs). 12.2% of the activities were misclassified using standMETs compared with an 8.6% misclassification rate for METs based on predicted RMR (P < .0001). StandMET differences and misclassification rates were highest for low fit, overweight, and older individuals while there were no differences when corrMETs were used. Conclusion: Using 3.5 ml·kg−1·min−1 to calculate activity METs causes higher misclassification of activities and inaccurate point estimates of METs than a corrected baseline which considers individual height, weight, and age. These errors disproportionally impact subgroups of the population with the lowest activity levels.

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Kozey et al. have proposed a corrected MET to adjust for individual differences in RMR using the Harris-Benedict RMR equation.
“Kozey et al.43 have proposed a corrected MET to adjust for individual differences in RMR using the Harris-Benedict RMR equation.38”
From 2024 Adult Compendium of Physical Activities: A third update of the energy costs of human activities (2024) · cites this paper as [43]

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A Correction Factor Improves Met Estimates Of Physical Activities
Keadle, S. K., Lyden, K. A., John, S. W., & Freedson, P. S. (2009) · Medicine & Science in Sports & Exercise · doi:10.1249/01.mss.0000355145.34128.c7
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Self-citation
Errors in MET estimates of physical activities using 3.5 ml·kg⁻¹·min⁻¹ as the baseline oxygen consumption.
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Need to Revise Classification of Physical Activity Intensity in Older Adults? The Use of Estimated METs, Measured METs, and VO2 Reserve
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Comparing the standards of one metabolic equivalent of task in accurately estimating physical activity energy expenditure based on acceleration
Kim, D.-H., Lee, J., Park, H.-K., Jang, D. P., Song, S., Cho, B. H., Jung, Y.-S., Park, R.-W., Joo, N., & Kim, I. Y. (2016) · Journal of Sports Sciences · doi:10.1080/02640414.2016.1221520 · Cited by 9 · see citing works

Authors: Kozey, S., Lyden, K., Staudenmayer, J., & Freedson, P.
ORCID: Lyden, Kate
Staudenmayer, John
Freedson, Patty
Venue: Journal of Physical Activity and Health
Publisher: Human Kinetics
Published: 2010-07
Volume: 7
Issue: 4
Pages: 508-516
ISSN: 1543-3080 (ISSN-L)
1543-5474
DOI: 10.1123/jpah.7.4.508
OpenAlex: W2162050088
Cited by: 119
References: 34
Citations by year: 2026: 4 · 2025: 3 · 2024: 10 · 2023: 7 · 2022: 11 · 2021: 8 · 2020: 8 · 2019: 14 · 2018: 8 · 2017: 9 · 2016: 8 · 2015: 5 · 2014: 4 · 2013: 9 · 2012: 6
FWCI: 4.33
Type: journal article
Language: en
Open access: closed
Locations: Journal of Physical Activity and Health (publishedVersion)
PubMed (publishedVersion)
Funders: National Cancer Institute (R01CA121005)
Topics: Health Sciences › Medicine › Physiology › Physical Activity and Health
Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Obesity, Physical Activity, Diet
Keywords: resting metabolic rate, Harris-Benedict equation, physical activity energy expenditure, indirect calorimetry, body mass index, fitness level, older adults, overweight and obesity
MeSH terms: Adult, Female, Humans, Male, Middle Aged, Oxygen Consumption, Physical Fitness, Reference Values, Exercise, Body Mass Index, Young Adult

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Errors in MET Estimates of Physical Activities Using 3.5 ml·kg−1·min−1 as the Baseline Oxygen Consumption

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