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

Aiste Petraityte, Alexander H.K Montoye, Craig Broeder and Anton Simms

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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 83rd 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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Petraityte, A. et al. (2026-05-22). Validity and Reliability of the KORR Metabolic System During Submaximal and Maximal Exercise. Boston Research Journal of Social Sciences & Humanities, 6(2), 19-30.

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© 2026 Petraityte, Montoye, Broeder and Simms. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Craig Broeder

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