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  • Diego Casas Rodriguez thinks this is interesting:

bioindicator is any signal that we could use to monitor our activity or biological state. Examples of bioindicators for fitness trackers are things like swinging your arms in a certain pattern suggesting that you took a step, the changes in speed of blood moving through your veins suggest heart rate, or relative stillness over a certain period of time indicates that you’re sleeping.

From

Cover of Designing for Wearables

Note

bioindicator