biofeedback

/B AY0 OW0 F IY1 D B AE0 K/
noun
  1. 1

    A technique consisting of measuring a person's quantifiable bodily functions, such as blood pressure, heart rate, skin temperature, sweat gland activity, and muscle tension, then conveying the information to the person in real-time.

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Source: https://en.wiktionary.org/wiki/biofeedback