Med Student Medical News about Calcaneus; one-leg standing time

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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.

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).