Acute exercise-induced catecholaminergic responses after 16 weeks of community-based exercise training in early-stage breast cancer survivors

Table 4 Correlation matrix between exercise-induced responses in catecholamines and immune cells before and after training

Catecholamines	Response phase	Immune cell type	r	r2	95%CI	P value
Epinephrine (pg∙mL-1)	Initiation	Lymphocyte mobilization	0.34	0.11	(0.07-0.56)	0.016a
	Recovery	Lymphocyte egress	0.38	0.14	(0.11-0.59)	0.007a
	Initiation	MAIT cell mobilization	0.10	0.01	(-0.20 to 0.38)	0.506
	Recovery	MAIT cell egress	0.13	0.02	(-0.18 to 0.41)	0.413
	Initiation	Neutrophil mobilization	0.11	0.01	(-0.18 to 0.38)	0.467
	Recovery	Neutrophil egress	0.16	0.03	(-0.13 to 0.43)	0.278
Norepinephrine (pg∙mL-1)	Initiation	Lymphocyte mobilization	0.53	0.28	(0.29-0.70)	0.001a
	Recovery	Lymphocyte egress	0.47	0.22	(0.22-0.66)	0.001a
	Initiation	MAIT cell mobilization	0.16	0.03	(-0.14 to 0.43)	0.300
	Recovery	MAIT cell egress	0.21	0.05	(-0.09 to 0.48)	0.166
	Initiation	Neutrophil mobilization	0.54	0.30	(0.31-0.72)	0.001a
	Recovery	Neutrophil egress	0.19	0.03	(-0.11 to 0.45)	0.219

^aP ≤ 0.05 significant correlation (r).

Pearson’s correlations were assessed to investigate the association between training-induced changes in catecholaminergic and immune cell responses post-exercise. r: Pearson’s r with thresholds set at weak (< 0.40), moderate (0.40-0.69), and strong (≥ 0.70); r²: Coefficient of determination; MAIT: Mucosal-associated invariant T-cells.