From hamsters to dogs to elephants to whales, the number of heartbeats per lifetime is nearly the same, namely about 1.5 billion

— Geoffrey West, Los Alamos National Laboratory, and the Santa Fe Institute

Zubin Al Genubi writes: 

This sound a bit too deterministic. While genetic disposition is a large factor, conditioning, good diet, exercise, lifestyle must play a substantial part. Moderation must help. 

Russ Sears writes: 

While I cannot give the source because it been 35 years since I read it. This heart beat speculation was part of why doctors up until recently did not recommend running for health benefits. If g-d had designed us that way, why should we even test it with statistics.

It's only been since 80s women ran a marathon in the Olympic because of these types of simple reasoning.

The statistics speak volumes about the benefits of cardio exercise especially running. However that benefit declines the more you train and it's not surprising that one could design a study which shows overtraining can lower life expectancy. As I've aged the difference between training and over training has become much harder to draw a line… hence I suspect many of the negative life expectancies are from older endurance athletes over training.

And I suspect these shocking to unsuspecting readers are in much more demand too produce due to click-baiting of journalists than real science.

Also many of theses studies one can use a simple test if they are legitimately looking at the issues. If the study is look at average age at death or actually deaths to expected. Average age of death is heavily influenced by the start of running boom and early outlier deaths. It will take many more year before averaging age is valid In other words most serious endurance athletes are still living so their positive effects not seen in average age at death. Opposite of survival effect in stock market historical studies.





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