I would be interested in a biofeedback app that could help with relaxation.
For example, if an app were made that produced and audible tone linked to the pulse, with the tone’s pitch lowering or raising in line with the lowering or raising of the heart rate. This could provide feedback to the user, who can then learn to lower the tone and thus their heart rate consciously.
I used to have a device that did something like this, years ago, but it only worked off the conductivity of the palm of the hands. As conductivity decreased, and stress lowered, the tone the device produced would get lower.
Having something like this that linked to pulse would be brilliant.
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