Lack of Agreement Between Gas Exchange Variables Measured by Two Metabolic Systems

Table 1. Gas exchange variables measured by the Innocor and CardiO at peak exercise.

Gas exchange variables	Innocor mean (SD)	CardiO₂ mean (SD)	p value	Difference %	Cronbach’s Alpha
VO₂ (l^.min^-1)	2.88 (1.02)	2.83 (.80)	.97	.15	.89
VCO₂ (l^.min^-1)	2.95 (1.14)	3.19 (1.21)	.19	7.52	.91
V_E (l^.min^-1)	79.62 (28.72)	81.31 (32.76)	.55	2.08	.97
FeO₂ (%)	17.29 (0.54)	17.31 (.52)	.87	.12	.78
FeCO₂(%)	3.69 (0.59)	3.97 (.39)	.11	7.05	.35
RER	1.02 (0.13)	1.13 (.14) *	.04	8.15	.53

Abbreviations: VO- oxygen uptake, VCO - carbon dioxide production, V - minute ventilation, FeO - fraction of expired oxygen, FeCO - fraction of expired carbon dioxide, RER – respiratory exchange ratio. * significantly different (p < 0.05).