Nope - but I'm a believer in the concept. (Remember to off-set from heavy coffee drinking, opening envelopes from tax-office etc.).
You measure HRV 'on waking' to avoid any factors like food, caffeine intake, stress.
A famous danish special ops soldier (and former teambuilder for Bjarne Riis' team) wrote in his book that every morning when he wake up, he checks his pulse to know the basic state of freshness. You can become a special ops too.
@hippy started
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Nope - but I'm a believer in the concept. (Remember to off-set from heavy coffee drinking, opening envelopes from tax-office etc.).