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All this talk below about Heart Rates got me thinking(6 posts)

All this talk below about Heart Rates got me thinkingFez
Apr 21, 2003 9:59 AM
What is the effect of training and improved fitness on heart rates. Could one of our "experts" comment True or False on the following statements?

1) Resting heart rate drops as fitness improves.

2) TRUE max heart rate probably does not change. I'm guessing most are still 5-10 beats away from their true max even if they are busting their butt on the bike, but being in better shape allows them to closer approach the true max.

3) Training and improved fitness increases your lactic threshold (LT) number.

4) All other things being equal, do the numbers of your heart rate zones (zones 1-5) drop as you get fitter? OR, are you just able to operate at higher heart rate numbers with ease as your LT number rises.
More on statement #4...Fez
Apr 21, 2003 10:11 AM
Some training books have talked about calculating training zones based on LT HR, rather than max HR.

If your LT increases as you get more and more fit, the targe training zone numbers will be getting incrementally higher. Sound logical?
Heart rate facts where I am the subjectonespeed
Apr 21, 2003 10:13 AM
1. My resting heart rate drops as fitness improves.

2. My max heart rate is different for cycling than it is for running. I can reach my max heart rate much faster when running than biking.

3. I dont know anything about this subject (LT) but know that I can deal better with the pain of burning muscles as I get more fit.

4. I can operate at the higher heart rates for longer periods of time as I get more fit.
re: All this talk below about Heart Rates got me thinkingcarpe_podium
Apr 21, 2003 10:17 AM
I'm no expert (blah, blah, blah) but here's what I think:

1. True. (improved aerobic capacity)

2. True, when I'm out of shape it's easier for me to hit my "max" which hasn't changed in several years of HR training. If I'm in shape, my heart isn't the weakest link in the chain - legs sometimes give out before I hit max.

3. True, if you do LT training, aerobic only training won't raise LT, some anaerobic training is necessary.

4. There are several different defn. for "zone", but most are some percentage of max. You go faster at a given HR, become more efficient, etc.

Hopefully some other more qualified (LFR and others) will respond with more detail.
You're off...Dwayne Barry
Apr 21, 2003 10:56 AM
on 3.
Aerobic training will result in a rise in LT. Realize LT is the point at which the muscle's production of lactate and pyruvate from glycolysis outstrips it's ability to oxidize them. The main adaptation to any type of endurance exercise is an increase in the oxidative capacity of the trained muscles. Greater oxidative capacity means the ability to produce more energy from either fats, or to oxidize the products of glycolysis. Both of which would lead an increase in the power produced at LT, simply because you can produce more energy via oxidation.
re: All this talk below about Heart Rates got me thinkingDwayne Barry
Apr 21, 2003 10:24 AM
1) True
2) True max HR does not change much with training, it does decrease slightly with age. False, it actually becomes harder to achieve a max or near max HR the fitter you become.
3) True
4) Depending on how you are defining HR zones, the HR to reach a zone should get higher as you get fitter. HR is an approximate measure of effort level, as you get fitter your LT HR (which is variable to significant degree) gets closer to your max.