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  1. I did search first, but did not find much in the forums about heart rate variability. It was mentioned only twice, including the following reference only: Calorie restriction in humans: An update. Most J, Tosti V, Redman LM, Fontana L. Ageing Res Rev. 2016 Aug 17. pii: S1568-1637(16)30183-0. doi: 10.1016/j.arr.2016.08.005. [Epub ahead of print] Review. PMID: 27544442 http://sci-hub.cc/10...arr.2016.08.005 those who are self-practicing this dietary intervention allows us to speculate on longer-term effects of more severe CR in humans. [From the full-text: Heart rate variability in the CR practitioners was comparable with published norms for healthy men and women 20 years younger (Stein et al., 2012) ... hormonal adaptations that have been reported in long-lived CR rodents, and are also implicated in the pathogenesis of several common cancers (Longo and Fontana, 2010), occurred in these individuals practicing severe CR.] I was wondering first of all, if anyone here is regularly tracking their heart rate variability, and if so, what device are you using and what are your results? This seems like something simple anyone could potentially track from home using their phone, an HRV app, and a relatively inexpensive bluetooth monitor. I once was tracking my own HRV but I was not confident in the chepo device I was using and once its battery died I never did any more with it. The reason I am thinking about this today is due to reading the following article: HRV Demographics, Part 1 – Age & Genderby Jason Moore | Jul 6, 2016 | application, health, research, science ...excerpt: "It is well established that HRV is a measure of biological age. Biological age correlates heavily with homeostatic capacity, which is the body’s ability to self-stabilize in response to stressors. Studies have shown that biological age is a better measure for determining health status and risk than chronological age. Yes, chronological age correlates very strongly with biological age. However, there are now many communities that are discovering that lifestyle choices can strongly influence your biological age regardless of chronological age." "In fact, the notion that one can control biological age has so much interest that there is a $1 million dollar prize being offered by The Race Against Time Foundation to competing teams that aim to reduce biological age. The foundation is backed by anti-aging thought leaders from Harvard, MIT, Stanford, the Alliance for Aging Research, and dozens more research organizations. “[The prize] will be awarded to the first team to demonstrate that it can restore homeostatic capacity (using Heart Rate Variability as the surrogate measure) of an aging reference mammal to that of a young adult.” The group has selected Heart Rate Variability as the indicator to determine the teams’ abilities to improve biological age through an improvement in homeostatic capacity." "Since biological age is not easily quantifiable except via HRV measurement itself, here are some normal ranges for HRV based on chronological age according to the study analyzing 260 healthy subjects performed by Umetani et. al, 1998." This in turn led me to the intriguing Palo Alto Longevity Prize: $500,000 Palo Alto Homeostatic Capacity PrizeThe $500,000 Palo Alto Homeostatic Capacity Prize will be awarded to the first team to demonstrate that it can restore homeostatic capacity (using heart rate variability as the surrogate measure) of an aging reference mammal to that of a young adult.