biostudies-literatureUnknown41(6)Rosenbach HIsrael Science FoundationDaily stressors elicit physiological and mental responses impacting health, cognition, and behaviour. Accurately assessing psychological stress responses in natural settings remains challenging despite extensive research, though wrist-worn devices have the potential to address this gap through remote data collection. The Garmin fitness tracker provides a stress score largely based on HRV which must be validated prior to use in research. This study aimed to (1) predict psychological self-reported stress from physiological measurements and Garmin calculated stress score, and (2) assess the stress score given by the Garmin Vivosmart 4 against HR and HRV from ECG recordings derived by the Polar H10 chest strap. A pilot study of 29 participants was conducted, followed by power calculations and Stress and health : journal of the International Society for the Investigation of Stresse70125https://www.ebi.ac.uk/biostudies/studies/S-EPMC12647429biostudies-literatureAssessing Stress Level Scores Against Wearables-Driven Physiological Measurements.PMC12647429Rosenbach HItzkovitch AGidron YSchonberg TfalseAssessing Stress Level Scores Against Wearables-Driven Physiological Measurements.Daily stressors elicit physiological and mental responses impacting health, cognition, and behaviour. Accurately assessing psychological stress responses in natural settings remains challenging despite extensive research, though wrist-worn devices have the potential to address this gap through remote data collection. The Garmin fitness tracker provides a stress score largely based on HRV which must be validated prior to use in research. This study aimed to (1) predict psychological self-reported stress from physiological measurements and Garmin calculated stress score, and (2) assess the stress score given by the Garmin Vivosmart 4 against HR and HRV from ECG recordings derived by the Polar H10 chest strap. A pilot study of 29 participants was conducted, followed by power calculations and 2025-01-01T00:00:00Z2025 Dec2026-06-05T19:52:43.441Z2026-05-21T03:11:33.645ZS-EPMC126474294129209710.1002/smi.70125