About the structure of posturography: Sampling duration, parametrization, focus of attention (part II)  

作　　者：Patric Schubert Marietta Kirchner Dietmar Schmidtbleicher Christian T. Haas 

机构地区：[1]Institute of Sport Sciences, Johann Wolfgang Goethe University, Frankfurt am Main, Germany

出　　处：《Journal of Biomedical Science and Engineering》2012年第9期508-516,共9页生物医学工程（英文）

摘　　要：There exists a great variety of posturographic parameters which complicates the evaluation of center of pressure (COP) data. Hence, recommendations were given to use a set of complementary parameters to explain most of the variance. However, it is unknown whether a dual task paradigm leads to different parametrization sets. On account of this problem an exploratory factor analysis approach was conducted in a dual task experiment. 16 healthy subjects stood on a force plate performing a posture-cognition dual task (DT, focus of attention on a secondary task) with respect to different sampling durations. The subjects were not aware of being measured in contrast to a baseline task condition (BT, internal focus of attention) in the previously published part I. In compareson to BT a different factor loading pattern appears. In addition, factor loadings are strongly affected by different sampling durations. DT reveals a change of factor loading structure with longer sampling durations compared to BT. Specific recommendations concerning a framework of posturographic parametrization are given.There exists a great variety of posturographic parameters which complicates the evaluation of center of pressure (COP) data. Hence, recommendations were given to use a set of complementary parameters to explain most of the variance. However, it is unknown whether a dual task paradigm leads to different parametrization sets. On account of this problem an exploratory factor analysis approach was conducted in a dual task experiment. 16 healthy subjects stood on a force plate performing a posture-cognition dual task (DT, focus of attention on a secondary task) with respect to different sampling durations. The subjects were not aware of being measured in contrast to a baseline task condition (BT, internal focus of attention) in the previously published part I. In compareson to BT a different factor loading pattern appears. In addition, factor loadings are strongly affected by different sampling durations. DT reveals a change of factor loading structure with longer sampling durations compared to BT. Specific recommendations concerning a framework of posturographic parametrization are given.

关 键 词：Center of Pressure SAMPLE DURATION Posturographic Parameters EXPLORATORY Factor Analysis Nonlinear Methods DUAL-TASK Focus of Attention 

分 类 号：R73[医药卫生—肿瘤]