Study limitations
This study presented as a limitation the concomitance with the pandemic, due to the number of professionals excluded due to illness, transfers and interruption of research protocol as well as increased data collection time and intervention application in research participants. Research procedures needed to be adapted to institutional protocols to prevent the spread of SARS-CoV-2, without damaging the proposed methodology. There was also a shortage of clinical trials on using HRV CBKF in nursing professionals, limiting the discussion of findings with the literature.