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Table 2 Correlation between changes in creatine kinase (CK) and performance analysis characteristics

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

  Forwards (n = 30) Backs (n = 27)
  ΔCK Δ% CK ΔCK Δ% CK
  +16 hrs +40 hrs +16 hrs +40 hrs +16 hrs +40 hrs +16 hrs +40 hrs
Tackles 0.230 0.275 0.331 0.305 0.068 0.579** 0.025 0.386
Small Small Moderate Moderate Trivial Large Trivial Moderate
Hit-ups 0.448* 0.406* 0.494** 0.387* 0.407* 0.201 0.309 0.061
Moderate Moderate Moderate Moderate Moderate Small Moderate Trivial
Contacts hit 0.188 0.097 0.274 0.188 0.395 0.518** 0.463* 0.444*
Small Trivial Small Small Moderate Large Moderate Moderate
Total impacts 0.330 0.277 0.438* 0.343 0.404 0.638** 0.388 0.454*
Moderate Small Moderate Moderate Moderate Large Moderate Moderate
Scrum number 0.186 0.183 0.232 0.219     
Small Small Small Small
  1. Level of significance *p < 0.05; **p < 0.01.
  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.
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