The first cohort consisted of undergraduate university students, and the second cohort of administrative university staff. An e-mail was sent with the instructions, along with a link to a short ad hoc Google questionnaire with the exclusion criteria items and the experimental schedule options. The exclusion criteria included: being under 18 year and suffering for any cardiorespiratory disease. From the first cohort, 10 out of 14 participants completed all three experimental sessions with a correct heart rate signal (3 women and 7 men; mean age = 21.4 ± 1.6 years). One participant was also excluded from the analysis due to not following the assigned breathing rate in the Retest session. From the second cohort, 12 out of 20 university staff completed the three sessions breathing as instructed (10 women and 2 men; mean age = 49.3 ± 6.8 years). The loss of participants was due to cardiorespiratory diseases, a scheduled surgery, lack of an e-mail contact, and failure to complete the experimental sessions.

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