on April 28, 2014
at 04:28 PM
As you know, I am big on utilizing heart rate zones. I think the are extremely effective, and essentially free measures. Certainly residual lactate acid would be a better direct measure, but certainly more difficult to measure.
While I have no hard data, I would assume that there does not reach a limit (assuming reasonable rest and recovery ~8-10 hours day) going from zone 1 to zone 2 would provide a negative effect on longevity. However zone 3 would have an upper limit, and it becomes exponentially worse the longer and higher you move up the heart range. However, I do not believe that we could answer that with certainty -- The problem with the science out there is that (1) It is never a placebo controlled study (how would you even do that?) (2) It is usually observational (3) We lack appropriate tatical measures to guage long term effects.
[soap box] Chronic cardio is not jogging. Chronic cardio is prolonged exertion of Zone 4 and Zone 5 without recovery. Marathon training, for most, is not disasterous for health. Marathon training, for elite athletes, is. [/soap box]