Article
Reliability of GOW heart rate monitor for heart rate variability measurement on exercise
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Published: | October 24, 2011 |
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Objective: In this study we try to compare HRV data from a smart textile system for recording heart rate variability (GOW) (Weartech s.l; Spain) and an electrocardiogram machine (Cardiolab II plus) (Prucka engineering, TX, USA) commonly used in hospitals, during a continuous cycling test.
Material/Methods: 6 cardiology patients performed a cycling test at stable intensity, heart rate variability data was recorded by the two systems during the test. 3’ RR segments were taken to compare time intervals between beats and HRV variables, using Bland-Altman analysis and intraclass correlation coefficient (ICC).
Results: Limits of agreement (LoA) were stable on RR intervals around 4 ms (Widdest LoA: -7.979 to 7.457; Tigthest LoA: -4.351 to 3.553; Medium LoA, -4.39 to 4.90). HRV variables present ICC to ensure interchangeability of the methods in 5 of 7 variables. However RMSSD, HF and SD1 have large LoA.
Conclusion: Time intervals between heartbeats recorded by two metods were similars, LoA was about the difference on sampling times (1 ms for ECG and 4 ms for GOW). Correlation on HRV variables between the two methods is good as well as agreement. Except for RMSSD, HF and SD1, related to short-term variability, and sensitive to different sampling times. We conclude that both systems have excellent agreement in the register of RR intervals, but they are not so great for HRV variables related to the short time.