Physical activity and fat-free mass during growth and in later life

Klaas R. Westerterp*, Yosuke Yamada, Hiroyuki Sagayama, Int Atomic Energy Agcy Doubly Labe, Philip N. Ainslie, Lene F. Andersen, Liam J. Anderson, Lenore Arab, Issaad Baddou, Kweku Bedu-Addo, Ellen E. Blaak, Stephane Blanc, Alberto G. Bonomi, Carlijn V. C. Bouten, Pascal Bovet, Maciej S. Buchowski, Nancy F. Butte, Stefan G. J. A. Camps, Graeme L. Close, Jamie A. CooperSai K. Das, Richard Cooper, Lara R. Dugas, Ulf Ekelund, Sonja Entringer, Terrence Forrester, Barry W. Fudge, Annelies H. Goris, Michael Gurven, Catherine Hambly, Asmaa El Hamdouchi, Marije B. Hoos, Sumei Hu, Noorjehan Joonas, Annemiek M. Joosen, Peter Katzmarzyk, Kitty P. Kempen, Misaka Kimura, William E. Kraus, Robert F. Kushner, Estelle Lambert, William R. Leonard, Nader Lessan, Corby K. Martin, Anine C. Medin, Erwin P. Meijer, James C. Morehen, James P. Morton, Marian L. Neuhouser, Theresa A. Nicklas, Albertine J. Schuit

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

27 Citations (Scopus)

Abstract

Background: Physical activity may be a way to increase and maintain fat-free mass (FFM) in later life, similar to the prevention of fractures by increasing peak bone mass.Objectives: A study is presented of the association between FFM and physical activity in relation to age.Methods: In a cross-sectional study, FFM was analyzed in relation to physical activity in a large participant group as compiled in the International Atomic Energy Agency Doubly Labeled Water database. The database included 2000 participants. age 3-96 y, with measurements of total energy expenditure (TEE) and resting energy expenditure (REE) to allow calculation of physical activity level (PAL = TEE/REE), and calculation of FFM from isotope dilution.Results: PAL was a main determinant of body composition at all ages. Models with age, fat mass (FM), and PAL explained 76% and 85% of the variation in FFM in females and males < 18 y old, and 32% and 47% of the variation in FFM in females and males >= 18 y old, respectively. In participants < 18 y old, mean FM-adjusted FFM was 1.7 kg (95% CI: 0.1, 3.2 kg) and 3.4 kg (95% CI: 1.0, 5.6 kg) higher in a very active participant with PAL = 2.0 than in a sedentary participant with PAL = 1.5, for females and males, respectively. At age 18 y. height and FM-adjusted FFM was 3.6 kg (95% CI: 2.8, 4.4 kg) and 4.4 kg (95% Cl: 3.2, 5.7 kg) higher. and at age 80 y 0.7 kg (95% CI: -0.2. 1.7 kg) and 1.0 kg (95% CI: -0.1, 2.1 kg) higher. in a participant with PAL = 2.0 than in a participant with PAL = 1.5, for females and males, respectively.Conclusions: If these associations are causal, they suggest physical activity is a major determinant of body composition as reflected in peak FFM, and that a physically active lifestyle can only partly protect against loss of FFM in aging adults.
Original languageEnglish
Pages (from-to)1583-1589
Number of pages7
JournalAmerican Journal of Clinical Nutrition
Volume114
Issue number5
DOIs
Publication statusPublished - Nov 2021
Externally publishedYes

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