https://www.mindbodygreen.com/articles/heart-rate-variability-chart
https://www.onepeloton.com/blog/heart-rate-variability-hrv/
Monitoring heart rate variability (HRV) can offer insights into your readiness for physical exertion, mental challenges, or daily tasks. While comparing HRV between individuals isn't informative due to its personal nature, understanding your own baseline and trends is valuable. Higher HRV indicates balanced nervous system activity, reflecting fitness, restfulness, and recovery. Conversely, lower HRV may signal stress or illness. The autonomic nervous system regulates HRV, with higher variability suggesting effective balance between its branches. Lifestyle factors like exercise, diet, hydration, alcohol consumption, sleep quality, and stress management influence HRV. Strategies to improve HRV include regular exercise, a balanced diet, adequate hydration, moderate alcohol consumption, sufficient sleep, and stress reduction techniques like [[Meditation]].
https://www.heartmath.org/hmi/file/?r=dEJic0tLVHNXb0R2bkNRakJyTXhSWmFMYm4wNlJ0K1pyUXRDTkw5cjZmeGVha3hkejh3NGFTYWxsM2I4eHc3M25EbmYva0JrcmU5NDEwM3VKaVhnWDM4ekNReFRRMGM4cWJqQS80bjhtWE82M1pVbi9LRVl0OW9Jb3B2L2RsREFjUVlQenlNT29hVUV2Tk1PVDBqY0xVUzhWdUs4ckVKYStTZkJ2M1VnaElWYnZYQkN2aVJMb2IxckVZV2xOVndh