Very High Movement Speed in a Hitting Action Affects Interjoint Coordination But Not Spatial Accuracy

Area of Science:

• Biomechanics
• Motor Control
• Sports Science

Background:

• Ballistic movements in sports demand both speed and accuracy.
• Understanding the speed-accuracy trade-off is crucial for optimizing athletic performance.

Purpose of the Study:

• To investigate the impact of varying movement speeds on the accuracy and variability of ballistic, target-hitting tasks.
• To determine if higher movement speeds affect spatial accuracy and outcome variability.

Main Methods:

• 16 healthy young men performed a task involving sliding a handle to hit a disc towards a target.
• Movement speeds ranged from very low to very high.
• Kinematic analysis assessed joint coordination (shoulder, elbow, wrist) and movement velocities.

Main Results:

• Higher movement speeds (very high) showed reduced variability in peak and contact velocities for handle displacement and elbow extension.
• Inter-joint coordination (shoulder, elbow, wrist) exhibited higher relative phase values at very high speeds.
• No significant effect of increased movement speed was observed on the spatial accuracy or variability of the disc's displacement towards the target.

Conclusions:

• Ballistic skills can be executed at high movement speeds without sacrificing spatial accuracy or outcome variability.
• The findings challenge the traditional notion of a strict speed-accuracy trade-off in certain motor tasks.
• This has implications for training methodologies in sports requiring rapid, precise movements.