Table 4. Partial correlation analyses between biochemical and CPET parameters (age control).

	ABTS	FRAP	MDA	CAT	GPx	SOD
Exercise duration	−0.14	−0.18	−0.22	−0.18	0.00	−0.10
Respiratory exchange ratio	0.13	0.00	−0.02	0.02	0.15	0.04
Minute ventilation	−0.12	−0.06	−0.04	−0.01	0.09	−0.11
Breathing rate	0.13	0.06	0.00	0.05	−0.13	0.13
Ventilatory tidal volume	0.02	−0.07	−0.09	−0.06	−0.04	0.09
Respiratory frequency	−0.14	−0.04	0.02	0.09	0.17	−0.23*
Heart rate peak	0.08	0.12	0.09	0.08	−0.10	−0.21
Oxygen pulse	−0.26*	−0.18	−0.07	0.00	0.02	−0.06
Cardiac output	−0.25*	−0.12	−0.07	−0.05	0.04	−0.15
Partial pressure end-tidal carbon dioxide	−0.08	−0.01	−0.03	−0.09	−0.03	−0.08
Partial pressure end-tidal oxygen	0.11	0.05	0.08	0.04	0.10	0.05

Notes.

Partial correlation test was only done on normally-distributed data. Since peak oxygen consumption, metabolic equivalents, ventilatory equivalent of oxygen and carbon dioxide as well as reactive oxygen species were not normally distributed, these data are not included here. Data is presented as correlation coefficients (r).

ABTS

ABTS radical scavenging activity

FRAP

Ferric reducing ability of plasma

MDA

Malondialdehyde

CAT

Catalase activity

GPx

Glutathione peroxidase activity

SOD

Superoxide dismutase activity

^*indicates the correlation is significant at the 0.05 level (2-tailed).