ICCBH2017 Poster Presentations (1) (209 abstracts)
Relative impact of muscle strength and muscle mass on bone mineral density in Japanese adolescents: data from the Kitakata Kids Health Study
Katsuyasu Kouda 1 , Yuki Fujita 1 , Takahiro Tachiki 1 , Akiko Yura 1 , Yuho Sato 2 , Jaalkhorol Myadagmaa 1 , Namiraa Dongmei 3 , Kumiko Ohara 4 , Harunobu Nakamura 4 & Masayuki Iki 1
1Department of Public Health, Kindai University Faculty of Medicine, Osaka-Sayama, Japan; 2Department of Health and Nutrition, Faculty of Human Life, Jin-ai University, Echizen, Japan; 3Department of Orthopedic Medicine, Second Affiliated Hospital of Inner Mongolia Medical University, Inner Mongolia, China; 4Department of Health Promotion and Education, Graduate School of Human Development and Environment, Kobe University, Kobe, Japan.
Objective: Little is known about the effects of muscle strength and muscle mass on bone health in children and adolescents. We examined the relative impact of muscle strength and muscle mass on bone mineral density in Japanese adolescents.
Methods: Subjects were 236 adolescents aged 15–18 years in August 2010 and August 2013 who were enrolled in the Kitakata Kids Health Study in Japan. Cross-sectional data including appendicular skeletal muscle mass (ASM) and areal bone mineral density (aBMD) were obtained. ASM and aBMD were measured using a dual-energy X-ray absorptiometry scanner. The ASM index (ASMI, kg/m2) was calculated as ASM (kg) divided by height (m) squared. Grip strength was measured as an indicator of muscle strength.
Results: Grip strength was significantly (P<0.05) and positively associated with aBMD at several skeletal sites after adjusting for age and sex (standardized partial regression coefficient, ß: lumbar spine, 0.61; total hip, 0.52; femoral neck, 0.56; whole body, 0.56). However, after additional adjustment for age, sex, and ASMI, grip strength was only associated with lumber spine aBMD (ß: 0.22). On the other hand, ASMI was significantly and positively associated with aBMD at all sites even after adjustment for age, sex, and grip strength (ß: lumbar spine, 0.56; total hip, 0.79; femoral neck, 0.82; whole body, 0.72).
Conclusion: Muscle strength was positively associated with aBMD in a muscle mass-dependent manner in Japanese adolescents. This association may be partly mediated by the amount of muscle mass.
This work was supported by Grants-in-Aid for Scientific Research (KAKENHI Grant Numbers 22370092, 25650160) from the Japan Society for the Promotion of Science.
The authors have no conflicts of interest to declare.
Disclosure: The authors declared no competing interests.
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