Key result
The accuracy of PPG-derived respiratory frequency depends significantly on the measurement site and breathing pattern, with the forehead and finger being the most accurate sites for normal and deep breathing, respectively.
Why the study?
Respiration-modulated photoplethysmographic signals can derive respiratory frequency across different body sites, but accuracy differences between sites under normal and deep breathing have not been comprehensively investigated.
Does the measurement site affect the accuracy of PPG-derived respiratory frequency compared to a reference chest strap in healthy subjects?
Population
36 healthy subjects
Comparison
PPG signals from six body sites vs reference chest respiratory belt
Design
Randomized-order crossover comparative study
Authors
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Site selection warrants caution for PPG respiratory monitoring; leaves open standardized validation in clinical populations.
Observational (n=36)
Randomized order of measurement sites
No
Does the measurement site affect the accuracy of PPG-derived respiratory frequency compared to a reference chest strap in healthy subjects?
p-value: p=<0.001
The accuracy of PPG-derived respiratory frequency is highly dependent on the measurement site and breathing pattern, with the forehead and finger being optimal for normal and deep breathing, respectively.
Hartmann et al. (2019) conducted an observational in Healthy (n=36). Photoplethysmography (PPG) at different body sites vs. Chest strap respiratory belt (reference) was evaluated on Bias between PPG-derived and reference respiratory frequencies (p=<0.001). The accuracy of PPG-derived respiratory frequency depends significantly on the measurement site and breathing pattern, with the forehead and finger being the most accurate sites for normal and deep breathing, respectively.