[KongchangAI]
Unverified82% confidenceDecision RuleTime unknown

以HRV心率变异性作为生物反馈核心指标的设备,采样应基于PPG光电或ECG电信号,其中ECG(胸带/指夹电极)测得的RMSSD误差通常<5%,而腕部/耳部PPG在静息状态下误差约5-10%,运动或说话时会显著漂移,追求呼吸训练精准闭环反馈应优先ECG方案

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