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George Demetrulias

HI Joe, Thanks for all the great info. I was at the seminar at Endurance Rehab and asked what intensity the aging athlete should be doing to stop the regression. The answer was Zone 5B. I need a little more clarification. The earlier posts indicate the intervals should be up to 5 minutes. I would think by definition Zone 5B could only be held for around 45 seconds max. Could you expand on this a little?


This series has been very interesting as I am 2 months older than you. However, unlike you, I was sedentary the first half of my life & obese during much of it.

Then I lost weight and became active, but nothing regularly or intense.

In the last 4 years I have started exercising regular, mostly biking with gym work outs during the winter.

In the past I just started out riding. This year, after reading a couple of your books, I started out with a slow base period. I did much better then in the past. But I never got past the base stage.

I don't race and most of my rides are 20 to 40 miles, but I have one 64 mile ride.

My goals are to gain a little speed (about 13mph now) and better endurance for a few more longer ride.

My problem is how to relate my needs to the training stages.

I suspect that there are a lot of people like me, but I don't know how may of them are in your audience.

Thanks, Bill

Joe Friel

George Demetrulias--Research on young, elite runners and cyclists has shown that about 5-6 minutes is the longest one can maintain VO2max velocity or power. Is that the same for seniors? Don't know. No research on that that I know of. But I've coached many who do power or velocity of VO2max for 3 minutes or slightly longer.

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