Verily Study Watchの睡眠測定におけるポリグラフ検査との比較性能
Sohrab Saeb1, Benjamin W Nelson1,2, Poulami Barman1
1Verily Life Sciences, South San Francisco, CA, United States.
まとめ
Verily Study Watch (VSW)は、睡眠状態と覚醒状態を正確に分類し、睡眠追跡において有望な結果を示しています。総睡眠時間などの一部の睡眠測定にはバイアスが見られましたが、VSWは自由生活下での睡眠モニタリングに適しています。
科学分野:
- ウェアラブル技術
- 睡眠科学
- 生体医工学
背景:
- 睡眠評価のゴールドスタンダードであるポリグラフ検査(PSG)は、リソース集約的です。
- ウェアラブルデバイスは、便利で長期的な睡眠モニタリングの可能性を提供します。
- ウェアラブルによる正確な睡眠検出は、臨床および研究アプリケーションにとって重要です。
研究 の 目的:
- 主要な睡眠測定について、Verily Study Watch(VSW)のPSGに対する性能を評価すること。
- 睡眠/覚醒分類および睡眠段階検出におけるVSWの精度を評価すること。
- VSW由来の睡眠パラメータとPSGとのバイアスおよび一致を定量化すること。
主な方法:
- 1回の実験室PSG中の41人の成人からデータを収集しました。
- 睡眠/覚醒および睡眠段階分類について、VSWとPSGのエポックごとの比較を行いました。
- 総睡眠時間(TST)、睡眠後覚醒時間(WASO)、睡眠潜時(SOL)、睡眠効率(SE)、および覚醒回数(NAWK)を分析しました。
- 性能指標には、感度、特異度、Cohenのκ係数、およびBland-Altman分析が含まれました。
主要な成果:
- 睡眠/覚醒分類における高い感度(0.97)および特異度(0.70)。
- 4クラスの睡眠段階検出におけるCohenのκ係数は0.64であり、中程度の一致を示しました。
- ほとんどのVSW睡眠測定で比例バイアスが観察され、TST(14.0分)およびWASO(-13.1分)で顕著な平均バイアスが認められました。
- 睡眠潜時および覚醒回数については、バイアスは低かったです。
結論:
- Verily Study Watchは、睡眠/覚醒検出において良好な性能を示し、睡眠段階検出において中程度の精度を示しました。
- 一部の睡眠パラメータにはバイアスが見られますが、VSWは自由生活条件下での一晩の睡眠追跡のための実行可能なツールです。
- さらなる研究により、精度向上のために特定の睡眠指標のバイアスを最小限に抑えるアルゴリズムを洗練させることが可能です。
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