Academic journal article Research Quarterly for Exercise and Sport

Application of Generalizability Theory in Estimating the Reliability of the Biodex Stability System

Academic journal article Research Quarterly for Exercise and Sport

Application of Generalizability Theory in Estimating the Reliability of the Biodex Stability System

Article excerpt

Evaluating standing balance is an important component of lower extremity neuromuscular function and sport training assessment. One device capable of quantifying balance is the Biodex Stability System (BSS). Reliability measurement is a function of the number of trials performed as well as different days tested. Our purpose was to perform a generalizability theory analysis to determine the amount of variation associated with the facets of Trials and Days and to determine the most reliable protocol for measurement. In Generalizability Theory, distinction is made between two types of studies: G study and D study (Morrow etal, RQES, 57:3, 1986). G-study is used to quantify the amount of variance associated with different facets. D (Decision) study provides information about which protocols are optimal for a particular measurement situation by generating generalizability coefficients (G's), which can be interpreted as reliability coefficients across facets. Forty participants participated (20 men and 20 women; 22.4 [+ or -] 3.4 years; 72.45 [+ or -] 12.5 kg; 170.25 [+ or -] 9.25 cm) without lower extremity injury or vestibular disorder. The BSS is an instrumented circular tilt board that moves in a 360[degrees] horizontal plane. The degrees of tilt are measured and a stability index is calculated based on the deviation from horizontal. …

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