legs vs. lungs, running vs. cycling

[email hidden] (Matt Daly) wrote in message
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Quoted message said:

I have found that the limiting factor in my running is my lung power: I run out of breath before
my legs give out. In cycling, it's the reverse: I can often easily breathe through my nose only
while my legs scream with pain. At around 160 BPM, I am breathing hard while running but not at
all when cycling. Why the discrepancy?

For most people the opposite would be true. Your LT is typically ~10 beats lower for cycling than
running so you should be working harder when cycling at 160 BPM. The best way to check is to measure
your LT in both sports. In my case they are about 3 BPM apart, running higher than cycling.

Quoted message said:

Does this indicate a relative weakness in one of the two disciplines? Any VO2 or LT implications?
I'm about a 40 min 10K runner and can do about a 65 min 40K bike TT, if that makes any
difference.

It doesn't look like you are weak in either sport but a little more data might shed some light on
the situation.

Steve W.

[email hidden] (Matt Daly) wrote in message
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Quoted message said:

I have found that the limiting factor in my running is my lung power: I run out of breath before
my legs give out.

Me too. Now, I'm not a triathlete, I used to be a cyclist, now I'm a runner who rides a little.

When I was a cyclist, my legs and lungs were a matched set, but as I dropped cycling and took up
running, my leg strength dropped while my lungs didn't. Now my legs aren't strong enough to keep up
with my lungs when I'm riding.

-JimV