Korean J Fam Pract. 2017; 7(2): 258-263  https://doi.org/10.21215/kjfp.2017.7.2.258
Association between Dietary Protein Intake and Sarcopenia in Korean Elderly
Hye Jin Ju1, Woo Kyung Bae2,*, Se Young Jung3, Ji Hye Yang1, Jae Kyeong Song1, Kiheon Lee3, Jong-Soo Han2, Hwa Yeon Park3
1Department of Family Medicine, Seoul National University Hospital, Seoul; 2Health Promotion Center, Seoul National University Bundang Hospital, Seongnam; 3Department of Family Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
Woo Kyung Bae
Tel: +82-31-787-7805, Fax: +82-31-787-4014
E-mail: naslig@gmail.com
Received: March 18, 2016; Revised: July 13, 2016; Accepted: July 22, 2016; Published online: April 20, 2017.
© The Korean Academy of Family Medicine. All rights reserved.

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Background: Skeletal muscle mass loss is frequently observed with aging. A few studies have indicated that daily protein intake is associated with sarcopenia, but none has examined the Korean population. This study was conducted to analyze the association between dietary protein intake and sarcopenia in elderly Koreans.
Methods: Data were derived from the Fourth and Fifth Korea National Health and Nutrition Examination Survey (2008-2011). Participants included 2,118 men and 2,746 women aged 60 or older. Sarcopenia was defined as an appendicular skeletal muscle mass (ASM) divided by body weight less than 2 standard deviations below the sex-specific mean for young healthy adults. Daily protein intake was estimated with a 24-hour recall method. This study used multiple logistic regression to evaluate the association between dietary protein intake and sarcopenia, and multiple linear regression analysis to evaluate the association between dietary protein intake and ASM.
Results: The prevalence of sarcopenia was 7.27% in men and 8.46% in women. Univariate analysis showed that daily protein intake was negatively correlated with sarcopenia and positively correlated with ASM. After adjustment for age, sex, obesity, smoking, alcohol, comorbidities, and total energy intake, daily protein intake was not associated with either sarcopenia or ASM.
Conclusion: In elderly Koreans aged over 60 years, daily protein intake was not associated with sarcopenia or ASM.
Keywords: Sarcopenia; Appendicular Skeletal Muscle Mass; Protein Intake; Nutrition
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