https://www.mobihealthnews.com/news/duke-study-activity-not-skin-tone-can-impact-wearables-ppg-heart-rate-accuracy
The conclusion that research-grade wearables tended to be less accurate than consumer-grade wearables is of concern. The study’s authors said "This is especially important for researchers and clinicians to be aware of when choosing devices for clinical research and clinical decision support. It is our hope that this analysis framework can act as a guide for researchers, clinicians and health consumers to evaluate such tradeoffs when exploring potential wearable devices for use in a clinical study, digital biomarker development, clinical practice, or in personal health monitoring,”