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Breast-torso movement coordination during running in different breast support.

Genevieve K R Williams1, Jo Reeves2, Domenico Vicinanza3

  • 1Faculty of Health and Life Sciences, University of Exeter, Exeter, UK. g.k.r.williams@exeter.ac.uk.

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Summary

Wearing a sports bra significantly improves breast-torso coordination during running, reducing motion compared to going braless. This enhanced coordination, particularly with encapsulation bras, offers new insights into breast support and movement complexity.

Keywords:
BiomechanicsBraBreastCouplingFemaleNonlinear dynamics

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Area of Science:

  • Biomechanics
  • Human Movement Science
  • Sports Engineering

Background:

  • Breast motion during physical activity can impact comfort and performance.
  • Understanding breast-torso coordination is crucial for developing effective breast support.
  • Existing methods for quantifying breast motion lack comprehensive analysis of dynamic interactions.

Purpose of the Study:

  • To compare breast-torso coordination and mutual influence across different breast support conditions (no bra, encapsulation bra, compression bra) during running.
  • To investigate the complexity and coupling between breast and torso movement during running.
  • To evaluate the effectiveness of different bra support levels in reducing breast motion.

Main Methods:

  • Twelve female participants ran at 10 km/h on a treadmill.
  • Nipple and torso kinematics were recorded.
  • Advanced analytical techniques including vector coding, Granger causality, and transfer entropy were applied to quantify breast-torso coordination within gait cycles.

Main Results:

  • Both bra conditions showed significantly higher in-phase breast-torso movement (> 90%) compared to no bra (~66%).
  • Encapsulation bras resulted in more in-phase movement than compression bras (p=0.006).
  • Breast support significantly affected Granger causality (p < 0.001), with greater information transfer from torso to breast across all conditions.

Conclusions:

  • Sports bras enhance breast-torso synchronization during running, reducing overall motion.
  • The study introduces advanced analytical methods for a deeper understanding of breast support effectiveness.
  • Findings suggest that measures of coupling, predictability, and complexity transfer are valuable for future research on breast support, comfort, and performance.