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Validation of the Polar Fitness Test for Estimation of Maximal Oxygen Consumption at Rest in Medically Supervised Exercise Training: Comparison with CPET and the 6-Minute Walk Test †

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Veröffentlicht in:Sensors vol. 25, no. 18 (2025), p. 5649-5665
1. Verfasser: Neudorfer, Michael
Weitere Verfasser: Ötzlinger Lukas, Kumar, Devender, Niebauer, Josef, Smeddinck, Jan David, Sareban Mahdi, Treff Gunnar
Veröffentlicht:
MDPI AG
Schlagworte:
Germany
Patients
Exercise
Accuracy
Validity
Physical fitness
Mortality
Sensors
Sports medicine
Hospitals
Wearable computers
Rehabilitation
Skin
Fitness equipment
Walking
Validation studies
Fitness training programs
Heart rate
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Abstract:The Polar Fitness Test (PFT) estimates maximal oxygen consumption (<inline-formula>V̇</inline-formula>O2max) under resting conditions using heart rate data from the manufacturer’s wearable devices. We aimed to validate the PFT in a population with cardiovascular risk factors and to compare its results with five established equations predicting <inline-formula>V̇</inline-formula>O2max based on the 6-min walk test (6MWT). Twenty-four participants (9 female; age 57.4 ± 10.2 years) undergoing medically supervised exercise training—including seven individuals on heart rate-limiting medication—completed the PFT, 6MWT, and cardiopulmonary exercise testing (CPET), which served as the criterion <inline-formula>V̇</inline-formula>O2max measurement. The PFT showed a mean absolute percent-age error (MAPE) of 13.7%, an intraclass correlation coefficient (ICC) of 0.743, a mean bias of −1.0 mL/min/kg, and limits of agreement (LoA) of ±11.4 mL/min/kg compared to CPET. Among the 6MWT-based equations, only the Porcari equation demonstrated similar performance (MAPE 12.6%, ICC 0.725, mean bias 0.2 mL/min/kg, LoA ± 9.7 mL/min/kg), while other equations showed larger errors and systematic deviations. Our data indicate that the PFT may present an easily accessible option to estimate <inline-formula>V̇</inline-formula>O2max on population level when exercise-based testing is not feasible. However, its variability limits use for individual clinical decisions, reaffirming the relevance of CPET for accurate assessment.
ISSN:1424-8220
DOI:10.3390/s25185649
Quelle:Health & Medical Collection