Certainly “The Haywire Heart” written by an electrophysiologist and a cycling coach indicates that 3 hours seems to be the break point beyond which repeated high level efforts result in diminishing marginal gains and probably has an adverse effect long term on mortality and morbidity.

Bob Perls
www.unitenm.us









On Oct 22, 2018, at 11:42 AM, John via Bike-racers <bike-racers@mailman.swcp.com> wrote:

Viewed an interesting Ted Talk about how High Intensity/Competitive training can cancel out any gains made to longevity.  Seems moderation is key or until the next study comes out….   
 
https://www.youtube.com/watch?v=Y6U728AZnV0
 
 
From: Bike-racers <bike-racers-bounces@mailman.swcp.com> On Behalf Of John Vance via Bike-racers
Sent: Monday, October 22, 2018 11:17 AM
To: Bike Racers <bike-racers@swcp.com>
Subject: [NMCycling] For health benefits, there is no upper bound on aerobic exercise
 
 
There are two takeaways from this study.  First, being inactive really is deadly, and second, there is no risk associated with the levels of exercise we engage in.  In fact, health benefits continue to increase the more you exercise:
 
>There does not appear to be an upper limit of aerobic fitness above which a survival benefit is no longer observed. These results are in concordance with previous observational studies35-38 of highly active cohorts and other large, longitudinal studies4,6 of CRF and mortality but are notably discrepant from population-based studies24-26 of physical activity and exercise. This difference may reflect the objective measurement of physical fitness in the present study, as opposed to self-reported activity levels, which have been a major limitation of prior studies.
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