What question did this study set out to answer?

To evaluate the validity and test-retest reliability of the COSMED K5 wearable metabolic system compared to a stationary ParvoMedics TrueOne2400 system during treadmill exercise testing.

April 10, 2026Baylor University Medical Center ProceedingsOpen Access

Validity and reliability of the K5 wearable metabolic system during high-intensity treadmill testing in healthy, young adults

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To evaluate the validity and test-retest reliability of the COSMED K5 wearable metabolic system compared to a stationary ParvoMedics TrueOne2400 system during treadmill exercise testing.
Assessed 31 healthy adults (mean age 25.8 ± 2.8 years, 61.3% male) completing three Bruce protocol treadmill exercise trials: one with ParvoMedics and two with K5.
Randomized and counterbalanced the order of the first two trials, followed by a third trial using the K5 system.
Averaged breath-by-breath data over the final 90 seconds of each stage and analyzed validity via Bland-Altman plots and reliability via intraclass correlation coefficients (ICC).
Demonstrated excellent test-retest reliability for oxygen consumption (VO2) and carbon dioxide production (VCO2) using the K5 system (ICC = 0.90–0.98).
Observed proportional bias across workloads (P < 0.01), with K5 recording higher VO2 and VCO2 values at low intensities and lower values near peak intensities relative to the stationary reference.

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Implication

Randomized crossover study demonstrates high reliability and validity of the K5 wearable metabolic system in healthy young adults, supporting its use for field-based testing.

Cite This Study

Brown et al. (2026) studied this question.

synapsesocial.com/papers/6a84b1a3ba7e475f268d9e28 https://doi.org/10.1080/08998280.2026.2647611

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Implication

Randomized crossover study demonstrates high reliability and validity of the K5 wearable metabolic system in healthy young adults, supporting its use for field-based testing.

Validity and reliability of the K5 wearable metabolic system during high-intensity treadmill testing in healthy, young adults

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Discussion

Implication

Cite This Study

Validity and reliability of the K5 wearable metabolic system during high-intensity treadmill testing in healthy, young adults

Key Points

Discussion

Implication

Cite This Study

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