Small changes in ball position at address cause a chain effect in golf swing

Area of Science:

• Sports Biomechanics
• Golf Swing Analysis
• Human Movement Science

Background:

• The golf swing is a complex kinetic chain involving precise body segment coordination.
• Understanding how initial setup variables affect swing dynamics is crucial for performance optimization.

Purpose of the Study:

• To investigate the chain effects of mediolateral (M-L) ball positioning on ground reaction forces, body segment/joint angles, and whole-body center of mass during the golf swing.

Main Methods:

• Twenty professional golfers performed five shots each with five distinct M-L ball positions.
• Ground reaction forces and body segment motions were captured using motion analysis systems.
• Data were analyzed at 14 swing events from address to impact using Statistical Parametric Mapping.

Main Results:

• Left-sided ball positions at address resulted in greater left foot weight distribution and more open shoulder angles compared to the reference position.
• Right-sided ball positions showed reversed trends.
• These effects, absent during the backswing, reappeared during the downswing.
• The whole-body center of mass shifted towards the target with left-sided positions and away with right-sided positions.

Conclusions:

• Initial ball position along the M-L axis initiates a cascade of biomechanical changes throughout the golf swing.
• Golfers may need to adjust their swing mechanics based on ball positioning to maintain optimal force production and body alignment.