Longitudinal study of muscle strength, quality, and adipose tissue infiltration - PubMed (original) (raw)
. 2009 Dec;90(6):1579-85.
doi: 10.3945/ajcn.2009.28047. Epub 2009 Oct 28.
Tamara B Harris, Marjolein Visser, Seok Won Park, Molly B Conroy, Pedro Velasquez-Mieyer, Robert Boudreau, Todd M Manini, Michael Nevitt, Anne B Newman, Bret H Goodpaster; Health, Aging, and Body
Affiliations
- PMID: 19864405
- PMCID: PMC2777469
- DOI: 10.3945/ajcn.2009.28047
Longitudinal study of muscle strength, quality, and adipose tissue infiltration
Matthew J Delmonico et al. Am J Clin Nutr. 2009 Dec.
Abstract
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.
Figures
FIGURE 1
Adjusted least-squares mean (±SEM) 5-y percentage changes in quadriceps muscle area (QMA) and average muscle torque (MT) by weight change group and sex. There were significant within-group declines in MT in men and women in all weight groups (all P < 0.001) and changes in QMA (all P < 0.001), except for QMA changes in weight-stable women. There were significant differences between weight-change groups for QMA and MT changes (all P < 0.001). However, there was a greater percentage decline in MT in each weight-loss group than in changes in muscle area. Data were analyzed by using ANCOVA, with adjustment for baseline values, age, baseline drinking, smoking, baseline BMI, interim hospitalization, and baseline and change in physical activity level, baseline comorbidity, and diabetes.
FIGURE 2
Adjusted least-squares mean (±SEM) 5-y percentage changes in midthigh subcutaneous fat (SF) and intermuscular fat (IMF) areas by weight-change group and sex. There were significant within-group changes in men and women for SF in the weight-loss and weight-gain groups (all_P_ < 0.001). There were also significant within-group changes in men and women in all weight groups for IMF (all_P_ < 0.001). There were significant differences between weight-change groups for SF and IMF changes (all P < 0.001). Data were analyzed by using ANCOVA, with adjustment for baseline values, age, baseline drinking, smoking, baseline BMI, interim hospitalization, and baseline and change in physical activity level, baseline comorbidity, and diabetes.
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