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" ... Intended to mimic the “lub-dub” of a heartbeat, the Doppel Wristband was created by a physicist as a drug-free way of altering a person’s psychophysiological state. Users program the research-backed device with a rhythm slightly faster than their resting heart rate for focus and concentration, or slightly slower for calm and relaxation. ... "
" ... The nerves you feel before your big moment could be classified as hyper-arousal, complete with sweaty palms, shaking hands, shortness of breath and possibly an irregular heart rate. These symptoms indicate that you’ve been pushed above the level at which you can maintain psychophysiological coherence — a state of harmony between your cognitive, emotional and physiological systems. ... "