I think you have it backwards, you want a higher HRV, not lower. A higher HRV is healthier. Being in a calm state will have higher HRV, being stressed will result in a lower HRV. Higher HRV is associated with reduced morbidity and mortality, and improved psychological well-being and quality of life.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5882295/

https://www.firstbeat.com/en/science-and-physiology/heart-ra...