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Table 3 Correlation between changes in creatine kinase (CK) and movement and performance markers derived from global positioning system (GPS) data

From: Match play performance characteristics that predict post-match creatine kinase responses in professional rugby union players

  Forwards (n = 23) Backs (n = 22)
  ΔCK Δ% CK ΔCK Δ% CK
  +16 hrs +40 hrs +16 hrs +40 hrs +16 hrs +40 hrs +16 hrs +40 hrs
Sprint number -0.172 -0.132 -0.149 -0.102 0.339* 0.419* 0.364* 0.332*
Small Small Small Small Moderate Moderate Moderate Moderate
Sprinting (m) -0.118 -0.060 -0.073 -0.016 0.409* 0.420* 0.447* 0.359*
Small Trivial Trivial Trivial Moderate Moderate Moderate Moderate
High-speed (m) -0.195 -0.133 -0.139 -0.079 0.239 0.434* 0.346* 0.437*
Small Small Small Trivial Small Moderate Moderate Moderate
Total contacts -0.204 -0.309 -0.146 -0.238 -0.097 0.113 0.080 0.363*
Small Moderate Small Small Trivial Small Trivial Moderate
  1. Level of significance *p < 0.05.
  2. Effect Sizes <0.10 trivial, 0.10-0.29 small, 0.30-0.49 moderate, 0.50-0.69 large, 0.70-0.89 very large, 0.90-0.99 nearly perfect.
  3. ΔCK change in creatine kinase; Δ% CK percentage change in creatine kinase; m metres.