Purpose: To examine the heart rate percentage (HR%) at the Anaerobic Threshold (AT) in order to determine the appropriate exercise intensity below or above the AT. A second goal was to assess the accuracy of different types of wearable heart rate monitors (HRMs) during a graded exercise test. Method: Thirty healthy individuals (n=21 male & n=9 female; aged 24.5 ± 3.5 years) participated in a single incremental exercise protocol on a cycle ergometer (CE). AT was detected through a metabolic cart by using V-slope method, which determined the point of a nonlinear increase in carbon dioxide output (VCO2) against oxygen uptake (VO2). HR was measured each minute of exercise test via two optical-based monitors (Apple iWatch S3 [IW] & Fitbit Ionic [FB]) and two electrical-based monitors (Quinton Q Stress [ECG] & Polar M400 [PL]). Electrocardiography (ECG) was used as a “Gold Standard” for comparison in this study. Results: AT was reached at the mean and SD of 130 ± 16 bpm. HR% at AT was observed 67 ± 8 % of HRpeak and Heart Rate Reserve Percentages (HRR%) at AT was observed 42 ± 15 %. Across all exercise testing stages (Stage 1 [S1], Stage 2 [S2], Stage 3 [S3], etc.), no significant differences were found in HR values between ECG and PL. The most statistical differences were found in HR between ECG and IW, (S5=[p=0.018], S6=[p=0.041] and S7=[p=.005],respectively). As intensity increased, FB and IW underestimated the HR values throughout all stages when compared with the ECG. Conclusions: analysis of HR% at AT was estimated approximately 67% of participant maximum effort as well as HRR% at AT was estimated at 42%. At the light-intensity, accurate outcomes of HR values were observed from all wearable HRMs. However, with an increased intensity, accuracy of wearable devices was varied at moderate and high intensity exercise testing. The PL had the greatest agreement with ECG when compared to other devices. This might be due to the fact that both HRMs utilize similar mechanism of measurement. Electrical-based HRMs are found to be more accurate in comparison with optical-based HRMs
|Advisor:||Figueroa, Michael A.|
|School:||The William Paterson University of New Jersey|
|Department:||Exercise and Sports Studies|
|School Location:||United States -- New Jersey|
|Source:||MAI 58/06M(E), Masters Abstracts International|
|Keywords:||Anaerobic threshold, Electrical-based, Heart rate percentages, Optical-based, Wearable heart rate monitors|
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