Validity and Reliability of the KORR Metabolic System During Submaximal and Maximal Exercise

Craig Broeder; Anton Simms; Aiste Petraityte; Alexander H.K Montoye

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Abstract

This study compared the KORR CardioCoach Pro metabolic system to the COSMED clinical-research system during submaximal steady-state exercise and maximal aerobic capacity. Eighteen adults (50.3 ± 11.9 yrs old, 78.6 ± 10.6 kg, 25.6 ± 8.0 % body fat, and cardiovascular fitness rank equaled 83^rd percentile) completed the validation phase while nine subjects were randomly assigned to the test-retest phase. Metabolic data was collected simultaneously with both systems. VO₂ max (mls • kg • min^-1) was not significantly different between systems (COSMED = 40.3 ± 5.7; KORR = 41.5 ± 5.8; ES = 0.21). There were no between-system differences for max ventilation, tidal volume, respiration rate, carbon dioxide production, or respiratory exchange ratio. The intra-class correlation (ICC) and regression slope between the two systems showed excellent agreement (ICC: 0.95; r-squared = 0.94; p = 0.0001; SEE = 1.4 mls • kg^-1 • min^-1). During submaximal exercise, no statistical between-system differences were observed. The intra-class correlation (ICC) and regression slope between the two systems showed excellent agreement (ICC: 0.92; r-squared = 0.937; p = 0.0001; SEE = 0.058 mls • kg^-1 • min^-1). There results indicate the KORR metabolic system accurately measured metabolism during both submaximal and maximal cycling.

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