Table 2.

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

	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

Level of significance *p < 0.05; **p < 0.01.

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.

ΔCK change in creatine kinase; Δ% CK percentage change in creatine kinase.