Breast size impacts spine motion and postural muscle activation

Area of Science:

• Biomechanical analysis
• Human physiology
• Spinal health research

Background:

• Large breast size is often associated with back pain and poor posture.
• The specific impact of breast size on spinal motion and muscle activation remains unclear.

Purpose of the Study:

• To investigate the correlation between breast size, spinal motion, and trunk muscle activation.
• To establish a baseline understanding for diverse breast sizes in relation to spinal biomechanics.

Main Methods:

• Assessed 15 pain-free university-aged females.
• Measured three-dimensional spine motion and trunk muscle activation during standing and flexion.
• Correlated breast size with kinematic and electromyographic data.

Main Results:

• Negative correlation between breast size and head/trunk angles in upright standing.
• Positive correlation between breast size and thoracic angles during flexion.
• Moderate positive relationships observed between breast size and trunk muscle activation.

Conclusions:

• Increased breast size is preliminarily associated with altered posture and heightened muscle activation.
• Findings suggest a need for further research across a wider range of breast sizes.
• Results can inform strategies for back pain prevention and treatment related to breast size.