ИСТИНА

Brassiere effectiveness has been extensively evaluated by measuring breast motion. Previous studies have calculated velocities and accelerations effectively collapsing kinematic waveforms into gross measurements of motion. While this approach quantifies the motion at discrete points in the waveform data, the time-varying aspects of breast motion related to periodicity have not been considered. Breasts are not a segment chain, nor centrally controlled, yet potentially influence motion of entire body [1]. Reductions in breast motion from wearing bras have been demonstrated, but relating reductions to subject perceptions of bra effectiveness or correlating reduction to breast size has met minimal success. These shortcomings suggest breast motion, and interaction with motion of other segments, is not adequately understood. Other aspects of the data may be important to consider. Recurrence Quantification Analysis (RQA) is a technique for describing non-linear dynamic properties, including the pattern and structure, of time varying waveforms. The study purpose was to classify breast motion using RQA. The hypothesis was that RQA would reveal differences in the dynamic qualities of breast motion in natural and supported conditions.