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Postural adjustments and bearing angle use in interceptive actions
Ambreen Chohan1, Geert J P Savelsbergh, Paulien van Kampen
1Institute for Biophysical and Clinical Research into Human Movement, Manchester Metropolitan University, Hassall Road, Alsager, ST7 2HL Cheshire, UK. a.chohan@mmu.ac.uk
Experimental Brain Research
|December 6, 2005
Summary
Adults use the bearing angle (BA) strategy to intercept moving balls, but this breaks down at interception. Wrist movements compensate, with deviations increasing at lower approach angles and higher ball velocities.
Area of Science:
- Biomechanics
- Motor Control
- Human Movement Analysis
Background:
- The bearing angle (BA) strategy is a model for intercepting moving objects.
- Understanding how humans adapt this strategy during locomotion is crucial for motor control research.
Purpose of the Study:
- To investigate the adherence to the BA strategy during locomotion towards a moving ball.
- To examine the influence of ball velocity and approach angle on BA strategy implementation and deviations.
- To analyze compensatory movements and postural adjustments during ball interception.
Main Methods:
- Twelve adult participants manually intercepted a moving ball at a target area.
- Data collection focused on ball velocity, walking direction, and approach angle.
- Analysis included adherence to the BA strategy, deviations, and movement patterns (proximal-distal).
Main Results:
- The BA strategy was implemented during locomotion but broke down at the point of interception.
- Wrist movements compensated for the BA strategy breakdown, influenced by ball velocity and approach angle.
- Deviations from the BA strategy increased with decreased approach angles and increased ball velocities.
- Adherence to the BA strategy correlated with reduced postural adjustments.
- Proximal-distal movements increased with higher approach angles and faster ball velocities.
Conclusions:
- Human interception of moving objects involves a dynamic interplay between locomotion and limb coordination.
- The BA strategy is a foundational but adaptable framework for interception, with compensatory mechanisms crucial for success.
- Environmental factors like ball velocity and approach angle significantly modulate interception strategies and movement efficiency.