Abstract
Objectives
The purpose of this study was to examine the relationships of pre-match creatine kinase
on match performance measures in elite Australian Rules football.
Design
Repeated measures single cohort longitudinal.
Methods
Twenty-nine elite Australian Rules football players were assessed across a competitive
season. Creatine kinase was collected 24–36 h pre-match, and investigated against two measures of match performance; performance
ranking scores (based on playing statistics) and coach's performance ratings. Multi-level
modelling was applied and player characteristics were considered as moderating variables
in the analysis.
Results
Average player pre-match creatine kinase was 485% greater than baseline values. Six-minute
running performance was negatively related with average player pre-match creatine
kinase (r = −0.432, p = 0.019). Creatine kinase was negatively associated with performance ranking scores
(r = −0.149, p = 0.035), although increases in playing experience reversed this relationship (p = 0.003). Coach's subjective ratings declined with elevations in pre-match creatine
kinase (p = 0.002).
Conclusions
Increases in creatine kinase from baseline to pre-match indicate residual muscle damage.
Small decrements in match performance were explained by increases in pre-match creatine
kinase. However, player characteristics related to age and experience appear to be
important moderating variables. Elevated pre-match creatine kinase likely represents
a state of incomplete recovery from the preceding week, and over time, residual muscle
damage. Creatine kinase monitoring may be most appropriately used with young and inexperienced
players, and those with lower aerobic running performance to assist in the modulation
of training and recovery loads to optimise match preparation and performance.
Keywords
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Article info
Publication history
Published online: June 17, 2013
Accepted:
May 10,
2013
Received in revised form:
April 24,
2013
Received:
December 20,
2012
Identification
Copyright
© 2013 Sports Medicine Australia. Published by Elsevier Inc. All rights reserved.
