Physiology
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REMOTE MEASUREMENT: ONE CAMERA. UP TO 8 METERS. HR OVER 200. VITAL SIGNS FROM VIDEO.
500 CHARACTERS REMOTE MEASUREMENT: ONE CAMERA. UP TO 8 METERS. HR OVER 200. VITAL SIGNS FROM VIDEO. REDTEL measures vital signs contactlessly at a…
28.08.2026
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HRV Measured with Light: The Individual Value May Be Wrong – But the Trend Is Supposed to Be Right?
Short text – approx. 500 characters “The individual value doesn’t have to be exact. What matters is the trend.” But why should a trend solve the…
14.08.2026
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HRV Is Supposed to Show Performance Capacity. But How?
Heart rate rises from 60 to 180 — ×3. Cardiac output can rise from 4.5 to 25–35 L/min. If heart rate explains only part of this increase, what can…
14.08.2026
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HRV IN WEARABLES: 1000 ms — BUT 1000 ms OF WHAT?
Same unit. Different measurement path. Different meaning. ECG measures intervals between heart events. PPG measures intervals between arriving pulse…
12.08.2026
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ECG measures the command (HRV). Wearables measure the effect (PWV). Blood pressure lies in between.
HRV from ECG begins with the electrical sinus node command. Wearables measure the pulse wave at the arm, wrist or finger. Between both lies blood…
11.08.2026
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Wrist and Finger Do Not Measure HRV: Between Heart and Sensor Lie Blood Pressure, Transit Time and Pulse Pressure Rhythm
Short Text up to 500 characters A watch or ring does not measure the electrical heart action. It measures blood-pressure-dependent trend data in the…
11.08.2026
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Why PWV Is Not Simply HRV: Without Blood Pressure, Pulse Wave Variability Remains an Unclear Millisecond Variance
Short Text up to 500 characters Wearables usually do not measure the electrical heart action directly. They measure the arrival of the pulse wave at…
10.08.2026
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Can a wearable evaluate sleep, stress, recovery, or health using only one of many parameters?
Short text (approx. 500 characters) Many wearables assess sleep, stress, or recovery primarily from heart rate variability (HRV). However…
31.07.2026
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Three Non-Invasive Verification Principles for Blood Pressure-Dependent Trend Data It is not the individual value that matters—it is the reproducible change between two defined physiological states.
The verification of blood pressure-dependent trend data requires a different approach than evaluating a single blood pressure value. An individual…
26.07.2026
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Proposal for Verifying the Functional Performance of Wearables Transparent. Reproducible. Verifiable.
Calibration, functional verification, and stress testing serve different purposes and should not be treated as the same process. Reliable…
25.07.2026
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The Tilt Table Gives Wearables Feedback.
Subtitle A defined change in body position creates a defined physiological response. Only devices that show this response in real time allow their…
24.07.2026
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Without Perspective, There Is No Motivation. A single measurement describes the present. A trend reveals the future.
Without Perspective, There Is No Motivation. Subheading A single measurement describes the present. A trend reveals the future. Approx. 500…
23.07.2026