Cited by 514Regulation of Appetite and ObesityBody Composition Measurement TechniquesThyroid Disorders and Treatments

Factors influencing variation in basal metabolic rate include fat-free mass, fat mass, age, and circulating thyroxine but not sex, circulating leptin, or triiodothyronine

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Johnstone, Alexandra M, Murison, Sandra D, Duncan, Jackie S, Rance, Kellie A, Speakman, John R·2005·The American Journal of Clinical Nutrition

Abstract

Background Basal metabolic rate (BMR) is the largest component of daily energy demand in Western societies. Previous studies indicated that BMR is highly variable, but the cause of this variation is disputed. All studies agree that variation in fat-free mass (FFM) plays a major role, but effects of fat mass (FM), age, sex, and the hormones leptin, triiodothyrionine (T3), and thyroxine (T4) remain uncertain.Objective We partitioned the variance in BMR into within- and between-subject effects and explored the roles of FFM, FM, bone mineral content, sex, age, and circulating concentrations of plasma leptin, T3, and T4.Design This was a cross-sectional study of 150 white adults from northeast Scotland, United Kingdom.Results Only 2% of the observed variability in BMR was attributable to within-subject effects, of which 0.5% was analytic error. Of the remaining variance, which reflected between-subject effects, 63% was explained by FFM, 6% by FM, and 2% by age. The effects of sex and bone mineral content were not significant (P > 0.05). Twenty-six percent of the variance remained unexplained. This variation was not associated with concentrations of circulating leptin or T3. T4 was not significant in women but explained 25% of the residual variance in men.Conclusions Our data confirm that both FFM and FM are significant contributors to BMR. When the effect of FM on BMR is removed, any association with leptin concentrations disappears, which suggests that previous links between circulating leptin concentrations and BMR occurred only because of inadequate control for the effects of FM.

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  1. Scrimshaw NS, Waterlow JC, Schurch B. Energy and protein require- ments. Proceedings of an IDECG Workshop 31 October to 4 November 1994. Eur J Clin Nutr 1996;50:S1-197.
  2. Elia M. Energy expenditure in the whole body. In: Kinney JM, ed. Energy metabolism: tissue determinants and cellular collaries. New York: Raven Press Ltd, 1992:19 -49.

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Authors
Johnstone, A. M., Murison, S. D., Duncan, J. S., Rance, K. A., & Speakman, J. R.
Affiliations
University of Aberdeen (GB)
Corresponding author
Johnstone, Alexandra M
Venue
The American Journal of Clinical Nutrition
Publisher
Elsevier BV
Published
2005-11
Volume
82
Issue
5
Pages
941-948
ISSN
0002-9165 (ISSN-L)
OpenAlex
W2132499198
Cited by
514
References
65
Citations by year
2026: 23 · 2025: 30 · 2024: 27 · 2023: 29 · 2022: 60 · 2021: 36 · 2020: 30 · 2019: 27 · 2018: 18 · 2017: 28 · 2016: 27 · 2015: 36 · 2014: 21 · 2013: 23 · 2012: 21
FWCI
3.18
Type
journal article
Language
en
Open access
Locations
  • American Journal of Clinical Nutrition (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Regulation of Appetite and Obesity
  • Health Sciences › Medicine › Physiology › Body Composition Measurement Techniques
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Thyroid Disorders and Treatments
Keywords
basal metabolic rate, fat-free mass, fat mass, age, sex differences, bone mineral content, thyroxine, triiodothyronine, leptin, daily energy expenditure
MeSH terms
Adipose Tissue, Adult, Age Factors, Basal Metabolism, Body Composition, Body Constitution, Calorimetry, Indirect, Cross-Sectional Studies, Humans, Male, Middle Aged, Oxygen Consumption, Scotland, Sex Factors, Thyroxine, Triiodothyronine, Absorptiometry, Photon, Muscle, Skeletal, Leptin

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