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A Comprehensive Method to Measure 3-Dimensional Bra Motion During Physical Activity.

Elisa S Arch1, Sarah Colón1, James G Richards1

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This study introduces a new 3D method to measure bra motion, revealing most movement occurs away from the nipple. This research aids in designing better athletic apparel to minimize breast motion.

Keywords:
breast biomechanicssoft-tissue biomechanicssports bra design

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Area of Science:

  • Biomechanics
  • Apparel Science
  • Sports Engineering

Background:

  • Previous breast and bra motion research primarily tracked nipple movement.
  • Nipple tracking fails to capture comprehensive regional soft-tissue motion during physical activity.
  • Understanding full breast tissue dynamics is crucial for effective apparel design.

Purpose of the Study:

  • To develop and validate an objective 3D method for comprehensively measuring bra motion.
  • To quantify regional displacement, velocity, and surface stretch of bras during exercise.
  • To compare motion characteristics between small and large bra sizes.

Main Methods:

  • A novel 3D motion capture system was developed and tested.
  • Six female participants (3 small bra, 3 large bra) ran on a treadmill.
  • Markers were placed on bras to measure displacement, velocity, and stretch.

Main Results:

  • Significant marker displacement (up to 52.6 mm) and velocity (up to 504.8 mm/s) were recorded.
  • Large bras exhibited greater motion than small bras.
  • Maximum motion occurred above/below the nipple and at the strap-body interface, not at the nipple itself.

Conclusions:

  • The new 3D method provides comprehensive data on bra motion, including regional dynamics.
  • Bra motion is not solely represented by nipple movement.
  • Findings are vital for designing innovative apparel to reduce breast motion during physical activity.