用手机测量 HRV：它是怎么做到的 Measuring HRV With Your Smartphone — How It Works

引言Introduction

心率变异性（HRV）研究的是「相邻心跳之间时间间隔的变化」，可以反映自主神经系统的状态。传统上，HRV 通过心电图（ECG）或光电容积脉搏波（PPG）测量；而现在，正如 Kubios HRV 手机 App 所展示的那样，用智能手机的加速度计也能测量 HRV。 Heart rate variability (HRV) examines "the variations in time between successive heartbeats" and provides insights into the autonomic nervous system. Traditionally measured through electrocardiogram (ECG) or photoplethysmography (PPG), HRV measurement is now accessible via smartphone accelerometers, as explained in the Kubios HRV mobile app.

科学背景Scientific background

早在 19 世纪末，人们就观察到心跳会在身体上产生可以被探测到的运动。血液流经动脉时，会产生细微的微动，而现代技术已经能够测量这些微动。 Historical observations from the late 19th century noted that heartbeats produce detectable body movements. As blood travels through arteries, it creates subtle micro-movements measurable by modern technology.

有两种关键的测量思路：Two key measurement approaches exist:

• 心冲击图（Ballistocardiography, BCG）：利用嵌在床垫、椅子或体重秤中的高灵敏加速度计，测量血液射出时身体产生的反冲力。 Ballistocardiography (BCG): Measures the body's recoil forces from blood ejection using sensitive accelerometers in mattresses, chairs, or scales.
• 心震图（Seismocardiography, SCG）：利用放在胸骨上的加速度计，测量心脏机械活动引起的胸壁振动。 Seismocardiography (SCG): Measures chest wall vibrations from cardiac mechanical activity using accelerometers on the sternum.

现代智能手机内置的高精度加速度计，使得把这些原理用于实际的 HRV 监测成为可能。 Modern smartphones with precise accelerometers enable these principles for practical HRV monitoring.

Kubios HRV 手机 AppThe Kubios HRV mobile app

该 App 的「恢复度测量」功能，让用户只需躺下并把手机放在胸口，就能评估静息 HRV——不需要胸带，也不需要任何可穿戴传感器。 The app's Readiness Measurement feature allows users to assess resting HRV by placing their phone on their chest while lying down—requiring no chest strap or wearable sensor.

基于加速度计的 HRV 测量原理How accelerometer-based HRV measurement works

心跳会产生沿身体传播的微小机械力。当手机平放在胸口时，其加速度计能探测到这些振动，并把它们转换成用于计算 HRV 的心搏间期（IBI）数据。保持不动、避免穿厚衣服，可以确保测量准确。 Heartbeats generate small mechanical forces traveling through the body. When a smartphone rests flat on the chest, its accelerometer detects vibrations, converting them into interbeat interval (IBI) data used for HRV calculation. Remaining still and avoiding thick clothing ensures accuracy.

用手机进行一次恢复度测量Taking a readiness measurement with your smartphone

推荐的步骤如下：Recommended steps include:

1. 体位与时间：使用一致的体位（躺卧或半躺），在固定的时间进行，最好是早晨。 Position and timing: Use consistent body position (reclined/semi-reclined) at regular times, preferably mornings.
2. 开始测量：把手机平放在胸骨上，让它自然放置，不要用手按着。 Start the measurement: Place phone flat on sternum; let it rest naturally without holding it.
3. 放松、正常呼吸：保持不动，不要说话，自然呼吸。 Relax and breathe normally: Remain still, avoid speaking, and breathe naturally.
4. 检查质量：查看信号质量；如果质量差就重测一次。 Check the quality: Review signal quality; repeat if poor.

基于加速度计测量 HRV 的好处Benefits of accelerometer-based HRV measurements

• 方便：不需要任何外接传感器，手机本身就是测量设备。Convenience: No external sensors required; smartphone becomes your monitor.
• 易于坚持：可以轻松融入日常作息。Accessibility: Easily integrate into daily routines.
• 无创：以舒适的方式评估压力水平与心脏健康。Non-Invasive: Comfortable assessment of stress levels and heart health.
• 可靠的 HRV 洞察：在恰当的静息条件下，结果稳定且准确。Reliable HRV insights: Consistent and accurate results under proper resting conditions.

这一方法仅适用于安静环境中静躺不动时的静息 HRV 测量，因为信号对运动非常敏感。测量期间心率应「保持在每分钟 90 次以下，以确保结果准确」。它不适用于体力活动期间或高动态环境。 This method works exclusively for resting HRV in quiet environments while lying still, as signals are sensitive to motion. Heart rate should remain "below 90 beats per minute during the measurement to ensure accurate results." Not intended for physical activity or high-motion environments.

基于加速度计的 HRV 测量准确吗Accuracy of accelerometer-based HRV measurements

虽然精度不及基于 ECG 的测量，但基于加速度计的 HRV 测量「在静息条件下表现出很高的可靠性」。已有研究证实，与 ECG 记录相比，心震图测量能准确提取心率，并可靠地估计 HRV 参数。 While not as precise as ECG-based measurements, accelerometer-based HRV demonstrates "high reliability under resting conditions." Research confirms heart rate extraction accuracy and reliable HRV parameter estimation through seismocardiographic measurements compared to ECG recordings.

Kubios App 采用了一套带噪声检测和经过验证的心搏校正的心跳检测算法，以保证 HRV 数据的可靠性。 The Kubios app utilizes a beat detection algorithm with noise detection and validated beat correction for reliable HRV data.

常见问题（FAQ）Frequently asked questions (FAQ)

用手机测 HRV 准确吗？Is smartphone-based HRV measurement accurate?

准确。当你静躺不动、手机平放在胸骨上时，基于加速度计的测量能提供「用于一般恢复度与健康监测的准确洞察」，在静息条件下是「基于 ECG 的方法的一种方便而可靠的替代方案」。 Yes. When lying still with the smartphone flat on the sternum, accelerometer-based measurement provides "accurate insights for general readiness and wellness monitoring" and serves as a "convenient and reliable alternative to ECG-based methods" for resting conditions.

什么是「放松期」？What is the relaxation period?

放松期通常至少持续 30 秒，让你在正式测量开始前从容地摆好手机位置。测量完成时 App 会提示你；放松期时长可以在设置中调整。 The relaxation period, typically lasting at least 30 seconds, allows you to calmly position your phone before measurement begins. The app notifies you when the measurement completes; duration is adjustable in settings.

恢复度测量测多久最合适？What's the ideal duration for a readiness measurement?

技术上 30–60 秒也能完成，但要做可靠的静息 HRV 分析，推荐「3 分钟的记录」；如需更高准确度，可以延长到 5 分钟。 While technically possible in 30–60 seconds, a "3-minute recording" is recommended for reliable resting HRV analysis, extendable to 5 minutes for better accuracy.

信号质量差怎么办？What if the signal quality is low?

优化测量条件：上身穿薄衣物、放松躺好，把手机平放在胸骨上且不要用手按着，全程保持完全静止、正常呼吸，避免移动和说话。必要时调整手机位置后重测。 Optimize conditions by lying relaxed in thin upper-body clothing, placing the phone flat on the sternum without holding it, remaining completely still, breathing normally, and avoiding movement or talking. Adjust phone position and repeat if needed.