Physical Activity Modifies the Association between Dietary Protein and Lean Mass of Postmenopausal Women - 14/12/17
, Betsy C. Wertheim, MS, Cynthia A. Thomson, PhD, RD, Jennifer W. Bea, PhD, Robert Wallace, MD, MSc, Matthew Allison, MD, MPH, FAHA, Linda Snetselaar, RD, PhD, FAND, LD, Zhao Chen, PhD, MPH, Rami Nassir, PhD, Patricia A. Thompson, PhDAbstract |
Background |
Maintenance of lean muscle mass and related strength is associated with lower risk for numerous chronic diseases of aging in women.
Objective |
Our aim was to evaluate whether the association between dietary protein and lean mass differs by physical activity level, amino acid composition, and body mass index categories.
Design |
We performed a cross-sectional analysis of a prospective cohort.
Participants/setting |
Participants were postmenopausal women from the Women’s Health Initiative with body composition measurements by dual-energy x-ray absorptiometry (n=8,298).
Main outcome measures |
Our study measured percent lean mass, percent fat mass, and lean body mass index.
Statistical analyses performed |
Linear regression models adjusted for scanner serial number, age, calibrated energy intake, race/ethnicity, neighborhood socioeconomic status, and recreational physical activity were used to determine the relationship between protein intake and body composition measures. Likelihood ratio tests and stratified analysis were used to investigate physical activity and body mass index as potential effect modifiers.
Results |
Biomarker-calibrated protein intake was positively associated with percent lean mass; women in the highest protein quintile had 6.3 percentage points higher lean mass than the lowest quintile (P<0.001). This difference rose to 8.5 percentage points for physically active women in the highest protein quintile (Pinteraction=0.023). Percent fat mass and lean body mass index were both inversely related to protein intake (both P<0.001). Physical activity further reduced percent fat mass (Pinteraction=0.022) and lean body mass index (Pinteraction=0.011). Leucine intake was associated with lean mass, as were branched chain amino acids combined (both P<0.001), but not independent of total protein. All associations were observed for normal-weight, overweight, and obese women.
Conclusions |
Protein consumption up to 2.02 g/kg body weight daily is positively associated with lean mass in postmenopausal women. Importantly, those that also engage in physical activity have the highest lean mass across body mass index categories.
Le texte complet de cet article est disponible en PDF.Keywords : Dietary protein, Leucine, Physical activity, Lean mass, Fat mass
Plan
| Supplementary materials: Table 4 is available at www.andjrnl.org |
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| STATEMENT OF POTENTIAL CONFLICT OF INTEREST No potential conflict of interest was reported by the authors. |
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| FUNDING/SUPPORT The WHI program is funded by the National Heart, Lung, and Blood Institute, National Institutes of Health, and US Department of Health and Human Services through contracts HHSN268201100046C, HHSN268201100001C, HHSN268201100002C, HHSN268201100003C, HHSN268201100004C, and HHSN271201100004C. Support was also provided by Susan G. Komen CCR14299136. |
Vol 117 - N° 2
P. 192 - février 2017 Retour au numéro
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