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Breast motion asymmetry during running.

Chris Mills1, Debbie Risius, Joanna Scurr

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Breast asymmetry in female runners is common. This study found that considering a dominant breast for support recommendations may be more effective than left/right categorization, especially when analyzing breast pain.

Keywords:
bradisplacementexercisekinematics

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Area of Science:

  • Biomechanics
  • Sports Medicine
  • Human Movement Science

Background:

  • Breast asymmetry is prevalent in females, potentially influencing breast motion during physical activity.
  • Understanding breast kinematics is crucial for effective breast support recommendations and managing breast pain.

Purpose of the Study:

  • To investigate the impact of breast categorization (left/right vs. dominant/non-dominant) on breast motion during running.
  • To explore the relationship between breast displacement, breast pain, and different breast support conditions.

Main Methods:

  • Ten female participants ran on a treadmill at 10 kph wearing no bra, an everyday bra, and a sports bra.
  • Infrared cameras tracked reflective markers on the thorax and nipples over five running gait cycles.
  • Multiplanar breast displacements were calculated relative to the thorax.

Main Results:

  • No significant left/right breast displacement differences were observed across support conditions.
  • Correlations between breast pain and anteroposterior displacement were stronger for the left breast (r=0.614) than the right (r=0.456).
  • Categorizing by dominant breast (greatest superior-inferior displacement) revealed significant differences in displacement across support types.

Conclusions:

  • Breast kinematic data should include both breasts when assessing breast pain or determining support needs.
  • Dominant breast categorization may offer more insight into displacement than simple left/right differentiation.
  • This highlights the importance of individualized assessment for breast support in female athletes.