Physical Activity Modifies the Association between Dietary Protein and Lean Mass of Postmenopausal Women

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• 作者：Jessica A. Martinez ; PhD ; ^{jam1@email.arizona.edu}Author Vitae ; Betsy C. Wertheim ; MSAuthor Vitae ; Cynthia A. Thomson ; PhD ; RDAuthor Vitae ; Jennifer W. Bea ; PhDAuthor Vitae ; Robert Wallace ; MD ; MScAuthor Vitae ; Matthew Allison ; MD ; MPH ; FAHAAuthor Vitae ; Linda Snetselaar ; RD ; PhD ; FAND ; LDAuthor Vitae ; Zhao Chen ; PhD ; MPHAuthor Vitae ; Rami Nassir ; PhDAuthor Vitae ; Patricia A. Thompson ; PhDAuthor Vitae
• 关键词：Dietary protein ; Leucine ; Physical activity ; Lean mass ; Fat mass
• 刊名：Journal of the Academy of Nutrition and Dietetics
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：117
• 期：2
• 页码：192-203.e1
• 全文大小：554 K
• 卷排序：117

文摘

Maintenance of lean muscle mass and related strength is associated with lower risk for numerous chronic diseases of aging in women.ObjectiveOur 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.DesignWe performed a cross-sectional analysis of a prospective cohort.Participants/settingParticipants were postmenopausal women from the Women’s Health Initiative with body composition measurements by dual-energy x-ray absorptiometry (n=8,298).Main outcome measuresOur study measured percent lean mass, percent fat mass, and lean body mass index.Statistical analyses performedLinear 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.ResultsBiomarker-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.ConclusionsProtein 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.