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Associations between short one‐leg standing time and speed of sound of calcaneal bone in a general population: The Shimanami Health Promoting Program (J‐SHIPP) study
Author(s) -
Kido Tomoko,
Tabara Yasuharu,
Igase Michiya,
Uetani Eri,
Ochi Namiko,
Miki Tetsuro,
Kohara Katsuhiko
Publication year - 2010
Publication title -
geriatrics and gerontology international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.823
H-Index - 57
eISSN - 1447-0594
pISSN - 1444-1586
DOI - 10.1111/j.1447-0594.2009.00565.x
Subject(s) - medicine , confounding , population , femoral neck , cross sectional study , body mass index , balance (ability) , preferred walking speed , regression analysis , calcaneus , osteoporosis , physical therapy , surgery , pathology , environmental health , machine learning , computer science
Aim: Loss of bone mass is a major cause of fracture in the elderly. One‐leg standing (OLS) time has been postulated to be predictive of reduced bone mass. Here, we conducted a cross‐sectional study to clarify whether OLS time measurements are associated with the speed of sound (SOS) of calcaneal bone independent of muscle mass in the lower extremity, a major confounding factor for the association, in a community‐dwelling population of middle‐aged to elderly subjects. Methods: The study subjects consisted of 770 apparently healthy middle‐aged to elderly community‐residents. Quantitative assessment of calcaneal bone was done using a quantitative ultrasound technique. OLS time with eyes open was measured with a maximum time of 60 s. Femoral muscle cross‐sectional area (CSA) was measured from a computed tomography image. Results: Subjects who could not stand 60 s on one leg ( n = 192) showed significantly lower SOS (1487 ± 20, 1501 ± 24 m/s, P < 0.001). In addition, femoral muscle CSA was positively associated with SOS (male, r = 0.148, P < 0.01; female, r = 0.204, P < 0.001). However, multiple regression analysis adjusted for age, sex and muscle CSA identified short OLS time less than 60 s as an independent determinant of SOS in both male ( P < 0.001) and female ( P < 0.05) subjects. OLS time was significantly associated with posturograph‐measured mobility of the center of gravity. However, multiple regression analysis showed no significant correlation between balance impairment and SOS ( P > 0.1). Conclusion: OLS time less than 60 s was significantly associated with reduced SOS independent of age, sex and muscle mass in the lower extremity.