HRV hardware: They all measure the same thing, don’t they?

What exactly does a smartwatch measure? How does a smartwatch measure? Can I carry out long-term HRV measurements with a smartwatch? Why long-term measurements? “Because you can understand relationships much better with a long-term measurement!” That was the spontaneous reaction of our employee Lorenz Pühringer to this question. And he immediately provided some self-evident examples: When is the smartwatch useful, when is the 24-hour HRV measurement useful? HRV by Autonom Health

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