Abstract
Posture in a still stance has been quantified by changes in the center of pressure (COP), in both anterior-posterior (A/P) and medial-lateral (M/L) directions and measured on a single force platform (Bertec PRO VEC 5.0). The purpose of this study was to estimate the variance in error and the intrasession test-retest reliability, and to determine which measures shall be taken for further measurements, especially with adults age 65 and older. We used two types of approximation for the reliability coefficient. Firstly, we used the equation according to Blahuš (2) and secondly we used the Pearson's correlation coefficient for test-retest measurements. The findings allow us to say, among other things, that the tests of quiet standing Double Narrow Stance Eyes Open (DNSEO) and Double Narrow Stance Eyes Closed (DNSEC) are parallel, in the sense of parallel testing.
Highlights
The ability to maintain the body’s position over its base of support (BOS), whether this base is stationary or noviny, is called balance
Postural sway is determined by measuring the location and amount of changes that occurs in the position of the total vertical force vector projected onto a horizontal plane
Ad 1.a) – We found that the variance in error was 0.129. – We found that the intrasession reliability was very poor, which is for us very surprising
Summary
The ability to maintain the body’s position over its base of support (BOS), whether this base is stationary or noviny, is called balance. Controlling postural sway while standing still is called static balance. Even when people stand still on both feet, the body sways over its base of support. Postural sway is determined by measuring the location and amount of changes that occurs in the position of the total vertical force vector projected onto a horizontal plane. These measurements determine where the average center of pressure (COP) is located and how much variability of this location occurs during the measurement
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