Wearable devices demonstrated very good to excellent correlation with classic ECG for measuring heart rate variability at rest, though accuracy progressively declined with increasing exercise levels.
Systematic Review (n=18)
Do wearable devices accurately measure heart rate variability compared to gold standard ECG at rest and during exercise?
Wearable devices provide accurate heart rate variability measurements at rest, but their accuracy decreases during exercise, highlighting the need for improved technology for non-stationary conditions.
BACKGROUND: A growing number of wearable devices claim to provide accurate, cheap and easily applicable heart rate variability (HRV) indices. This is mainly accomplished by using wearable photoplethysmography (PPG) and/or electrocardiography (ECG), through simple and non-invasive techniques, as a substitute of the gold standard RR interval estimation through electrocardiogram. Although the agreement between pulse rate variability (PRV) and HRV has been evaluated in the literature, the reported results are still inconclusive especially when using wearable devices. AIM: The purpose of this systematic review is to investigate if wearable devices provide a reliable and precise measurement of classic HRV parameters in rest as well as during exercise. MATERIALS AND METHODS: A search strategy was implemented to retrieve relevant articles from MEDLINE and SCOPUS databases, as well as, through internet search. The 308 articles retrieved were reviewed for further evaluation according to the predetermined inclusion/exclusion criteria. RESULTS: Eighteen studies were included. Sixteen of them integrated ECG - HRV technology and two of them PPG - PRV technology. All of them examined wearable devices accuracy in RV detection during rest, while only eight of them during exercise. The correlation between classic ECG derived HRV and the wearable RV ranged from very good to excellent during rest, yet it declined progressively as exercise level increased. CONCLUSIONS: Wearable devices may provide a promising alternative solution for measuring RV. However, more robust studies in non-stationary conditions are needed using appropriate methodology in terms of number of subjects involved, acquisition and analysis techniques implied.
Γεωργίου et al. (Mon,) conducted a systematic review in Heart rate variability measurement (n=18). Wearable devices vs. Classic ECG was evaluated on Correlation between classic ECG derived HRV and wearable RV. Wearable devices demonstrated very good to excellent correlation with classic ECG for measuring heart rate variability at rest, though accuracy progressively declined with increasing exercise levels.