Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
from September 2014
©Journal of Sports Science and Medicine (2010) 09, 382 - 387

Research article
Consistency in Acceleration Patterns of Football Players with Different Skill Levels
Pinar Arpinar-Avsar1, , Abdullah Ruhi Soylu2
Author Information
1 Ege University, School of Physical Education and Sport, Izmir, Turkey
2 Hacettepe University, School of Medicine, Department of Biophysics, Ankara, Turkey

Pinar Arpinar-Avsar
✉ Ege University, Physical Education and Sport Department Izmir, Turkey
Publish Date
Received: 31-12-2009
Accepted: 04-05-2010
Published (online): 01-09-2010
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The aims of the present study were to compare the consistency in the lower limb acceleration patterns during inside and instep kicks performed by players with different skill levels, and to investigate the correlation between subjective rating scores for skill level relative to their kicking performance and knee acceleration repeatability. Thirteen club-level male soccer players of ages between 15-16 years participated in this study. Skill levels of individual players were quantified previously by evaluating shooting performance as a numerical value ranging from 1 to 10. Further evaluations were held through tri-axial acceleration data recorded at proximal tibial tuberosity beneath each patella on the players’ knees, in a procedure in which players were asked to complete four randomly ordered shooting trials of inside and instep kicks with 2-minute resting intervals. Hence, the mainstream data used in consistency calculations are in the form 4 by 1200 matrices (acceleration vs. time) per subject. In order to evaluate the consistency of acceleration data, the mean of the standard deviations (mSD) were calculated, and the associated Pearson-r correlation coefficients were incorporated to obtain mSD vs. skill correlations. As a result, repeatability was found to increase with skill level at z-axis acceleration for instep kicks only. However, it is possible to find the most appropriate orientation (for the two kicks) for meaningful correlations using vector rotations on the 3 orthogonal acceleration data, and this study shows that, after such suitable vector rotations, positive repeatability results could also be acquired for the inside kicks.

Key words: Accelerometry, soccer, repeatability, skill level

           Key Points
  • The repeatability of the acceleration waveforms are well correlated with the skill level of the subjects.
  • Accelerometry might be used as an objective and cost effective assessment that allows interpreting consistency of the action.
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