Re: Training zones, Heart-rate, Advice, and Humbug

Martin Smith wrote:

diablo wrote:

"oarsman" <oarsman101@xxxxxxxxx> wrote in message news:1139351499.211476.56090@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

There are many factors that effect heart-rate, temperature being one of
them. As the body increases in temperature, the heart rate for a given
load will increase. The body is not increasing effort, only the
heart-rate. To give an example, by using one of the many erg testing
protocols that can be found on the Concept 2 web site, I have a max
heart-rate of around 170bps at 420 watts. As expected, I can't hold
420 watts very long, but after 20 minutes of training at 250 watts, my
rate goes from 135 to 165, after another 30 minutes, I am close to 170.
That does not mean I am at 100% because my true 100% has been elevated
due to an increase in temperature. Rather than use heart-rate, it is
best to correlate effort to lactate, and then to use then effort zones
for training.

The temperature is one of the factors that will effect running vs.
swimming rates, most likely you are warmer running. Body position is
another, the pron position vs upright is easier on the system. Also,
"predicted maximum" is only that.

Bob Eldridge



I disagree with the notion that lactate is more reliable a measure - it is just as, if not more so, vulnerable to confounding variables as heart rate.

The effect of temperature on heart rate is a bit of a misnomer. Both you and JTaylor mention it, and the phenomenon you're talking about is 'Cardiac Drift', and has to do with changes in blood pressure as you sweat, as much as it is a shift in core temperature. hydrating 'on the nose' does much to assuage this affect.


I can provide anecdotal support. I use a step machine four or five times a week for an hour. The machine has a built-in heart rate monitor, and the readings agree with my own measurements. It has two sensors in the hand grips, and it samples your pulse as long as you hold onto the grips.

My pulse starts off at about 120bpm and stays there for about 20 minutes. Then it begins to rise. At 40 minutes, it is about 135bpm, and near thend about 150bpm. Coincidently, I begin to sweat a lot at about the 20 minute mark, and I don't drink until the end. I'll try drinking every ten minutes and note the effect.

I did this test again and these were the numbers:

Step Machine: TechnoGym (IMO the best equipment on the market)
Duration: 60 minutes.
Level: 14 (120 steps per minute all the way)
Age: 56
Weight: 90 kg

No hydratiuon during test.

The machine reported 116 steps per minute, but I counted them a few times and it was actually 121, so I'm saying 120. That's about as fast as you can climb steps one at a time without running. You can probably go a little faster and still not be running, but that gives you an idea.

Also, the machine's sensors consistently measured my heart rate 2 or 3 bpm lower than when I took my own pulse, but when I took my own pulse I had to let go of one of the grips to measure my pulse, of course, and this seemed to make the stepping a little harder. So the machine's sensors are pretty accurate. The machine appears to compute a moving average, though, which doesn't really make sense to me. I would prefer more of a snapshot.

Anyway, I started out at about 111bpm (My fitness has improved) After 20 minutes, I had reached 120bpm, 130bpm at 30 minutes, 135bpm at 40 minutes. From 50 minutes to the end, it fluctuated between 137 and 150 but the trend was up. At 60 minutes, my pulse was 150.

The machine began telling me my heart rate was too high whenever it went above 148. I assume it just means the TechnoGym designers think I should do that exercise below 149bpm at my age.

Next time, I will do the same test with the same parameters, but I will drink water throughout the test.
.

Relevant Pages

  • Re: Training zones, Heart-rate, Advice, and Humbug
    ... As the body increases in temperature, the heart rate for a given ... heart-rate of around 170bps at 420 watts. ... I disagree with the notion that lactate is more reliable a measure - it is just as, if not more so, vulnerable to confounding variables as heart rate. ...
    (rec.sport.swimming)
  • Re: Training zones, Heart-rate, Advice, and Humbug
    ... As the body increases in temperature, the heart rate for a given ... I disagree with the notion that lactate is more reliable a measure - it is just as, if not more so, vulnerable to confounding variables as heart rate. ... It has two sensors in the hand grips, and it samples your pulse as long as you hold onto the grips. ... Next time, I will do the same test with the same parameters, but I will drink water throughout the test. ...
    (rec.sport.swimming)
  • Re: Training zones, Heart-rate, Advice, and Humbug
    ... As the body increases in temperature, the heart rate for a ... due to an increase in temperature. ... My pulse starts off at about 120bpm and stays there for about 20 ... drink water throughout the test. ...
    (rec.sport.swimming)
  • Re: Training zones, Heart-rate, Advice, and Humbug
    ... As the body increases in temperature, the heart rate for a given ... heart-rate of around 170bps at 420 watts. ... just as, if not more so, vulnerable to confounding variables as heart rate. ...
    (rec.sport.swimming)
  • Re: heart rate monitor - pocketpc
    ... I want to create a program which shows information about my heart rate. ... E.g. the chest belts that come with a Polar watch. ... The belt just emits a pulse for every heartbeat. ... I could connect this pulse with a laptop serial ...
    (microsoft.public.pocketpc)
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