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09/20/2010

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Steve Irwin

How did they measure the change in performance of the triathletes? If they looked at percentage change in times, then we would expect longer distances to give rise to a greater percentage change in time for the same percentage change in power output. For example, consider a cyclist riding a 25 mile TT at 280W vs riding a 100 mile TT at 220W. If they lose 10% of their power, then their 25 mile time would increase by 3.95%, but their 100 mile time would increase by 4.01%, due to the non-linear relationship between power and speed. Also, to compare different sports, it would be necessary to account for the differing power vs speed relationship in each sport.

Rob

Joe

Would this advice still hold for those of us who have not "Maintained" fitness, but are looking to get it back?

I trained at a high level until my mid 20's in XC-Skiing and then let it all go until my mid-late 30's. ("Let it go" = 45 lbs)

I'm trying to get to the point where I'm not getting lapped in the local cyclocross races.

bruce

hi joe

i'm relatively new to the world of 'scientific running' - altho i've been running with a stopwatch for about 10 years. i've only discovered your blog today - its an awesome reference, and apologies if this has already been covered somewhere...

my question is the seemingly age-old one of determining HRmax (in order to setup my zones):-

1) i have 'seen' my max of 201 bpm on a HRM about 5 years ago (as opposed to the maligned 220-45=175 formula)

2) given that i have doctors approval, can i keep my 201 thru ages 45, 50, 55 and beyond, or should i apply some 'cap' e.g. a self-imposed 185, and decreasing every 5 years?

3) i just ran a 10K at an average of 180 bpm - is that 'good', or should i err on the the conservative side?

4) colleagues tell me to 'just push it - your body will tell you when its had enough'. is that 'safe' or 'stupid' - for a guy of increasing age?

all the best
bruce

Joe Friel

Bruce--Thanks for your note. I'd suggest not being concerned with max HR. the best indicator of intensity for training and racing is your lactate threshold HR. Do a search on my blog and you'll find references to it with descriptions of how to use it. For a more in-depth discussion pick up a copy of my book, Total Heart Rate Training. Available at Amazon, etc.

Joe Friel

Hi Rob--My next post on this topic will answer your question.

Joe Friel

Steve--It was a cross-sectional study in which they compared the rates of change between older and younger athletes by sport. They normalized the results of the comparison.

Pete

What about longer distances at increasing age induces more injury which = slower race times?

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