# Performance Evaluation of a New Sport Watch in Sleep Tracking: A Comparison against Overnight Polysomnography in Young Adults

## TL;DR

This study tested a new sport watch's ability to track sleep stages in young adults and compared it to a gold-standard sleep test, finding it performed similarly to existing consumer devices.

## Contribution

The study introduces a new sport watch prototype and evaluates its sleep-tracking accuracy in the presence and absence of prior exercise.

## Key findings

- The prototype achieved 84% accuracy for REM sleep and 91% for awake states without exercise.
- Agreement between the watch and polysomnography was moderate (k = 0.39) but not significantly affected by exercise or sex.
- The device showed similar or better performance than existing consumer sleep-tracking wearables for healthy adults.

## Abstract

Introduction: This study aimed to validate the ability of a prototype sport watch (Polar Electro Oy, FI) to recognize wake and sleep states in two trials with and without an interval training session (IT) 6 h prior to bedtime. Methods: Thirty-six participants completed this study. Participants performed a maximal aerobic test and three polysomnography (PSG) assessments. The first night served as a device familiarization night and to screen for sleep apnea. The second and third in-home PSG assessments were counterbalanced with/without IT. Accuracy and agreement in detecting sleep stages were calculated between PSG and the prototype. Results: Accuracy for the different sleep stages (REM, N1 and N2, N3, and awake) as a true positive for the nights without exercise was 84 ± 5%, 64 ± 6%, 81 ± 6%, and 91 ± 6%, respectively, and for the nights with exercise was 83 ± 7%, 63 ± 8%, 80 ± 7%, and 92 ± 6%, respectively. The agreement for the sleep night without exercise was 60.1 ± 8.1%, k = 0.39 ± 0.1, and with exercise was 59.2 ± 9.8%, k = 0.36 ± 0.1. No significant differences were observed between nights or between the sexes. Conclusion: The prototype showed better or similar accuracy and agreement to wrist-worn consumer products on the market for the detection of sleep stages with healthy adults. However, further investigations will need to be conducted with other populations.