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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
Geriatrics and Gerontology International, 10/28/09

Kido T et al. – One–leg standing (OLS) time less than 60 s was significantly associated with reduced speed of sound (SOS) independent of age, sex and muscle mass in the lower extremity.

• 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.

• 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).

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