Abstract
The purpose of this study was to develop a method for indexing the dynamic modulation of flexion/extension moment and the center of pressure (CoP) by the intra-abdominal pressure (IAP) during a lifting and lowering task. The indices were developed to provide information about tendency, direction and relative rate of change. The theories used in developing the two scaling indices are reviewed. Ten subjects were recruited, and their postural control and IAP were examined in the context of para-sagittal lifting and lowering. The two indices were applied before and after each critical event: liftoff, extend-to-flex (i.e., the inflection point of the whole body movement from extension to flexion) and touchdown. Statistical significance was found suggesting that both back-belt wearing and a breathing technique, Valsalva's maneuver, may change the modulating potential of IAP in postural control.
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