Longitudinal study of muscle strength, quality, and adipose tissue infiltration

M.J. Delmonico, T. Harris, M. Visser, S.M. Park, M.B. Conroy, P. Velasquez-Mieyer, R. Boudreau, T.D. Manini, M.C. Nevitt, A. Newman, B. Goodpaster

Research output: Contribution to JournalArticleAcademicpeer-review


Background: Sarcopenia is thought to be accompanied by increased muscle fat infiltration. However, no longitudinal studies have examined concomitant changes in muscle mass, strength, or fat infiltration in older adults. Objective: We present longitudinal data on age-related changes in leg composition, strength, and muscle quality (MQ) in ambulatory, well-functioning men and women. We hypothesized that muscle cross-sectional area (CSA) and strength would decrease and muscular fat infiltration would increase over 5 y. Design: Midthigh muscle, subcutaneous fat (SF), and intermuscular fat (IMF) CSAs and isokinetic leg muscle torque (MT) and MQ (MT/quadriceps CSA) were examined over 5 y in the Health, Aging, and Body Composition study cohort (n = 1678). Results: Men experienced a 16.1% loss of MT, whereas women experienced a 13.4% loss. Adjusted annualized decreases in MT were 2-5 times greater than the loss of muscle CSA in those who lost weight and in those who remained weight-stable. Weight gain did not prevent the loss of MT, despite a small increase in muscle CSA. Only those who gained weight had an increase in SF (P < 0.001), whereas those who lost weight also lost SF (P < 0.001). There was an age-related increase in IMF in men and women (P < 0.001), and IMF increased in those who lost weight, gained weight, or remained weight-stable (all P < 0.001). Conclusions: Loss of leg MT in older adults is greater than muscle CSA loss, which suggests a decrease in MQ. Additionally, aging is associated with an increase in IMF regardless of changes in weight or SF. © 2009 American Society for Nutrition.
Original languageEnglish
Pages (from-to)1579-1585
Number of pages7
JournalThe American Journal of Clinical Nutrition
Issue number6
Early online date28 Oct 2009
Publication statusPublished - Dec 2009

Bibliographical note

DA - 20091029 LA - ENG JT - The American journal of clinical nutrition


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