The Study of Fluorescent Chemicals for Fingerprint Development

Abstract

Center of pressure (COP) movement during sitting on an unstable chair can be used to represent static trunk postural control. Theoretically, healthy individuals with intact trunk proprioception should have similar COP movement between eye-open and eye-closed conditions regardless of visual feedback. The custom software program has been developed to investigate COP movement in this group of participants. However, test-retest reliability of COP measurement has not been established. Therefore, the purposes of this study were to determine test-retest of COP measurement, and compare area of COP movement (aCOP) between eye-open and eye-closed conditions in healthy individuals. Material and Method: Five healthy individuals (age = 26.6 ± 5.41 years; BMI = 21.46 ± 2.48kg/m2; 4 males) performed 30-second seated balance with eye-open (2 trials) and eye-closed (2 trails). The aCOP represents trunk postural control (greater area represents poor trunk postural control). Intra-class correlation coefficient (ICC) was used to determine test-retest reliability (ICC3, 1). 90% confidence minimum detectable change (MDC) was calculated to establish a degree of measurement error. Wilcoxon's signed rank test was used to compare aCOP between two conditions. Results: ICC3, 1 was 0.76 and 0.26, and MDC were 14.94 and 31.76 mm. in eye-open and eye-closed, respectively. This finding indicates moderate to good test-retest reliability of instrument for collecting COP movement. No significant difference was found between two conditions. Conclusion: The instrument in this study could be used to investigate trunk postural control in eye-open condition, but might be currently limited when using in eye-closed condition. The result from comparison between conditions suggests trunk proprioception may help maintaining balance during seated balance in healthy individuals. However, patients with low back pain suspected of having impaired trunk proprioception may demonstrate significant difference between these two conditions. Therefore, future study is needed to provide biomechanical evidence supporting this hypothesis.