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Individual differences in intra-individual variability.

R G Marteniuk¹

¹a Department of Physical Education , University of British Columbia.

Journal of Motor Behavior

|August 15, 2013

Summary

This summary is machine-generated.

Intra-individual variation in motor skills is reliable but largely task-specific. Performance level influences variation, but even when accounted for, reliability remains significant across different motor tasks.

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Area of Science:

Motor Control
Human Performance
Psychometrics

Background:

Understanding variability in motor skills is crucial for performance analysis.
Assessing the reliability of intra-individual variation provides insights into motor skill stability.

Purpose of the Study:

To estimate the reliability of intra-individual variation across four motor skills.
To investigate the relationship between intra-individual variation and mean performance level.
To determine the task specificity of intra-individual variation.

Main Methods:

Calculated intra-individual variation estimates for 75 participants across 4 motor skills.
Utilized Pearson product-moment correlations to assess reliability.
Employed second-order partial correlations to control for mean performance level.
Correlated intra-individual variation across the different motor skills.

Main Results:

Reliability of intra-individual variation ranged from r = .31 to r = .51 (p < .05).
Intra-individual variation correlated significantly with mean performance level in 3 of 4 skills (r = .36, .54, .55).
Reliability of intra-individual variation, after controlling for performance level, ranged from r = .27 to r = .34.
Intra-individual variation was found to be 95-100% task-specific.

Conclusions:

Intra-individual variation in motor skills demonstrates moderate reliability.
Motor skill performance level is a significant factor influencing variation.
The high degree of task specificity suggests that motor skill variation is not a general trait but is highly dependent on the specific skill being performed.