Relationship between age-related decreases in serum 25-hydroxyvitamin D levels and skeletal muscle mass in Japanese women.
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| Abstract |
A clearer understanding of skeletal muscle mass (SMM) in middle-aged and elderly individuals is important for maintaining functionality. In the present study, age-related changes in SMM, the threshold of SMM with walking difficulty, intestinal nutrient absorption rate, and various serum factors were examined in Japanese populations of different ages. We used 24-h creatinine excretion as a measure of total body SMM. Age-related decreases in SMM, intestinal nutrient absorption rates, and serum 25-hydroxyvitamin D [25(OH)D] concentrations were significantly higher in women than in men. The cut-off values for SMM (kg), its percentage of total body weight (BW), the SMM index [SMMI] (Kg / m2), and creatinine height index (CHI) (%) in elderly individuals with walking difficulty were approximately 8-10 kg, 17-20% of BW, 3.9-4.6 kg / m2, and 44%, respectively. Serum 25(OH)D concentrations were closely associated with SMM (kg, % of BW, kg / m2) and CHI (%) as well as the intestinal absorption rates of nitrogen (%) and phosphorus (%) in women, but not in men. The present results demonstrate that vitamin D is an important metabolic factor in skeletal muscle, and contributes to the optimal management of skeletal muscle and the prevention of sarcopenia. J. Med. Invest. 67 : 151-157, February, 2020.
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| Authors | Michiko Sato, Teruhiro Morishita, Takafumi Katayama, Shigeko Satomura, Hiroko Okuno, Nami Sumida, Masae Sakuma, Hidekazu Arai, Shinsuke Katoh, Koichi Sairyo, Akihiko Kawaura, Eiji Takeda |
| Journal | The journal of medical investigation : JMI (J Med Invest) Vol. 67 Issue 1.2 Pg. 151-157 ( 2020) ISSN: 1349-6867 [Electronic] Japan |
| PMID | 32378599 (Publication Type: Journal Article) |
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