Table 5. Correlations between the markers depicting the level of muscle cell damage and zonulin concentration at subsequent research stages.

	Post 1h		Post 12h
	r	p	r	p
Testosterone–zonulin		p = 0.616		p = 0.916
Cortisol–zonulin	r = 0.88	p = 0.007	r = 0.75	p = 0.01
CRP–zonulin	r = 0.79	p = 0.001	r = 0.71	p = 0.011
TNF-α–zonulin		p = 0.810		p = 0.730
Myoglobin–zonulin	r = 0.78	p = 0.001	r = 0.83	p = 0.02

Post 1h –assessment after race completion, Post 12h –assessment 12 hours after race completion, CRP–c-reactive protein, TNF-α–tumour necrosis factor alpha; p<0.05