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- W4239780499 abstract "1737 Current heart rate (HR) based calculations use linear steady state based function to calculate VO2 from HR. HR to VO2 relationship changes during variations in exercise intensity and non-exercise related physiological processes affecting HR especially at low intensity. PURPOSE: To examine whether addition of On- and Off- VO2- dynamics (VO2HR+ON/OFF) and respiration rate (VO2HR+Resp) or both (VO2HR+Resp+ON/OFF) increase the accuracy of HR based VO2 estimation (VO2HR). METHODS: Beat-by-beat HR and breath-by-breath VO2 data from 16 male and 16 female healthy untrained adults (age of 38 ± 9 years, weight 70 ± 11 kg, height 172 ± 8 cm and VO2max 44 ± 9 ml/kg•min−1) were collected 5 minutes prior to and 15 minutes after 10-min exercises at 40% and 70% VO2max and maximal stepwise test on bicycle ergometer. Two 50 min series of simulated low intensity real life tasks (RLT, mean HR 101 ± 8 and 105 ± 9 bpm) were also carried out. On- and Off- VO2 changes were used to model VO2 dynamics. Four neural network models were constructed using 3% from the data in the learning process: VO2HR, VO2HR+Resp, VO2HR+ON/OFF, VO2HR+Resp+ON/OFF. The whole dataset was used to evaluate the accuracy of the methods using mean absolute error (MAE) between estimated and measured VO2. RESULTS: Accuracy was enhanced (p<.001) in all exercise conditions and during RLTs when ON/OFF-response information was included. Across all subjects and conditions MAE of VO2HR 3.7 ml/kg•min−1 was reduced to 3.3, 2.3 and 1.9 ml/kg•min−1 improving the accuracy by 11%, 38% and 48% using VO2HR+Resp, VO2HR+ON/OFF, VO2HR+Resp+ON/OFF methods, respectively. During maximal exercise test MAE of VO2HR 4.9 ml/kg•min−1 was reduced to 4.4, 1.8 and 1.3 ml/kg•min−1 improving the accuracy by 6.1%, 60.9% and 70.7% using VO2HR+Resp, VO2HR+ON/OFF, VO2HR+Resp+ON/OFF methods, respectively. CONCLUSIONS: Both On- and Off- dynamics and respiration were able to enhance the accuracy of VO2 estimation compared with VO2HR from maximal to varying low intensity exercise. The greatest and the most consistent improvements were due to On- and Off-dynamics." @default.
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- W4239780499 date "2004-05-01" @default.
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- W4239780499 title "On- and Off-dynamics and Respiration Rate Enhance the Accuracy of Heart Rate Based VO2 Estimation" @default.
- W4239780499 doi "https://doi.org/10.1249/00005768-200405001-01208" @default.
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