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Associations between Serum 25-Hydroxyvitamin D Concentration and Physical Performance in Old-Old People Living in a Northern Area of Japan | OMICS International | Abstract
ISSN: 2167-7182

Journal of Gerontology & Geriatric Research
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Research Article

Associations between Serum 25-Hydroxyvitamin D Concentration and Physical Performance in Old-Old People Living in a Northern Area of Japan

Atsushi Mizumoto1*, Hikaru Ihira1, Keisuke Yasuda2, Keitaro Makino1, Yoko Miyabe1, Shigeyuki Saitoh3, Hirofumi Ohnishi4, Takao Suzuki5 and Taketo Furuna1
1Graduate School of Health Sciences, Sapporo Medical University, Japan
2Department of Rehabilitation, Obihiro-Kosei General Hospital, Japan
3Department of Nursing and 2nd Department of Internal Medicine, Sapporo Medical University, Japan
4Department of Public Health and 2nd Department of Internal Medicine, Sapporo Medical University, Japan
5National Institute of Longevity Science, National Center for Geriatrics and Gerontology, Japan
Corresponding Author : Atsushi Mizumoto
Graduate School of Health Sciences, Sapporo Medical University
South 1, West 17, Chuo-ku, Sapporo, Hokkaido 060-8556, Japan
Tel: +81 11-611-2111 (2974)
E-mail: [email protected]
Received September 11, 2013; Accepted October 16, 2013; Published October 18, 2013
Citation: Mizumoto A, Ihira H, Yasuda K, Makino K, Miyabe Y, et al. (2013) Associations between Serum 25-Hydroxyvitamin D Concentration and Physical Performance in Old-Old People Living in a Northern Area of Japan. J Gerontol Geriat Res 2:135. doi:10.4172/2167-7182.1000135
Copyright: © 2013 Mizumoto A, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

Purpose: The present study aimed to investigate the relationship between serum 25-hydroxyvitamin D [25(OH) D] levels and physical performance, including muscle strength, balance, and gait speed, in older individuals living in a northern area of Japan (latitude approximately 43°north).

Subjects: This was a cross-sectional analysis of 273 community-based older individuals (160 women; mean age, 80.0 years), who participated in the “Population-based and Inspiring Potential Activity for Old-old Inhabitants (PIPAOI)”study.

Methods: We collected blood samples to determine serum 25(OH) D levels, and we assessed physical performance according to hand grip strength, knee extensor strength, static standing balance, hip walking distance, normal walking speed, and the results of the Timed-Up-and-Go (TUG) test. The other variables were fall experience in the year prior to the study, the Tokyo Metropolitan Institute of Gerontology Index of Competence (TMIGIC), frequency of going outdoors, sun exposure, and exercise habits. Correlations between serum 25(OH) D levels and physical performance as well as other variables were assessed using Pearson’s and Spearman’s correlation analyses. We performed an analysis of covariance (ANCOVA) controlled for age, sex, body mass index, sun exposure, and exercise habits to minimize the influence of confounders on physical performance.

Results: We found significant associations between serum 25(OH) D levels and sex (rs=-0.19), bone density as measured by speed of sound in bone (r=0.16), grip strength (r=0.19), frequency of going outdoors (rs=0.16), sun exposure (rs=0.25), and TMIGIC (rs=0.15). After controlling for age, sex, BMI, sun exposure, and exercise habits, total length of the center of gravity of participants with 25(OH)D insufficiency were significantly longer than those of participants with sufficient 25(OH)D levels (p<0.05).

Conclusion: Our results suggest that it is important for community-based older individuals to maintain sufficient 25(OH) D levels in order to avoid lowering physical performance.

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