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A stroke engine has a slider-crank mechanism that converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider.
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Related Experiment Video

Updated: Sep 16, 2025

Comparison of Kinetic Characteristics of Footwork during Stroke in Table Tennis: Cross-Step and Chasse Step
07:19

Comparison of Kinetic Characteristics of Footwork during Stroke in Table Tennis: Cross-Step and Chasse Step

Published on: June 16, 2021

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

Victor Hugo Alves Okazaki1, Luis Augusto Teixeira2

  • 1Motor Neuroscience, State University of Londrina, Londrina, PR, Brazil.

Journal of Applied Biomechanics
|July 7, 2025
PubMed
Summary
This summary is machine-generated.

High movement speeds do not compromise accuracy in ballistic skills. This study found that increasing speed in target-hitting movements did not affect spatial accuracy or variability, suggesting optimal performance is achievable.

Keywords:
consistencyfast movementsjoint kinematicsspeed–accuracy

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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.