Specialist texts and background knowledge
Articles and specialist contributions on blood pressure, measuring principles, physiology, wearables, calibration and mobile diagnostics.
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All existing links to individual articles remain valid.
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Is Blood Pressure Present in Your Ring Signal?
Our Proof of Concept shows manufacturers within approximately ten minutes whether their ring signal contains a blood-pressure-dependent trend.
20.09.2026
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Wellness blood pressure must not turn sick people into healthy ones. HRV must not confuse abnormality with regulation.
We asked our system a digital question across 1,000 datasets: Which physiological abnormalities can be detected automatically?
09.09.2026
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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.
28.08.2026
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Why Wearables Only Measure Part of the Picture – and Algorithms Cannot Recover the Rest
Wearables never see the whole physiology. Some information is missing because its relevance is unknown; other information is lost to technical limits.
15.08.2026
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HRV Measured with Light: The Individual Value May Be Wrong – But the Trend Is Supposed to Be Right?
We know that HRV from an optical wearable is not the same as HRV from an ECG. But the absolute value isn’t that important.
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.
14.08.2026
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Testing Wearables: Is the Reading Really Your Heart Rate – or Just Plausibly Calculated Motion?
The most problematic measurement errors are not necessarily completely unrealistic values.
14.08.2026
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Wearables in Motion: Good Software Starts with a Good Signal – Hardware Determines What Can Be Calculated at All
When discussing optical wearables, much of the attention is focused on algorithms, filters and increasingly AI.
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.
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.
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
Heart rate variability originates at the heart. It describes the timing variation from heartbeat to heartbeat.
11.08.2026
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Why PWV Is Not Simply HRV: Without Blood Pressure, Pulse Wave Variability Remains an Unclear Millisecond Variance
HRV, heart rate variability, is a meaningful concept when it describes the variation from heartbeat to heartbeat.
10.08.2026