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Old 02-06-09, 08:21 AM   #1
HDK
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Heart rate or power for FTP on trainer

I have started using a KK pro trainer and last week I did a FTP test (2x20). I had an average power of 200 watts according to the power curves for the Kurt, and an average heart rate of 175. I am 47 years old btw. 2 days later, I get back on the trainer and target 85% of my 200 watts of power, which should put me in the 170 watt range. However, I was struggling to keep 135 watts and my heart rate for the (1x20) was 177. So I guess I had not fully recovered from the initial FTP test 2 days earlier. But, should I target 85% of my FTP heart rate, or 85% of the Kurt power curves. I know that a lot of outside factors can influence my heart rate, but because of that, isn't that a more accurate determiner of exertion or stress? I could do my training at 85% of my heart rate, but not 85% of my power. What are your thoughts?
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Old 02-06-09, 12:52 PM   #2
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But, should I target 85% of my FTP heart rate, or 85% of the Kurt power curves. I know that a lot of outside factors can influence my heart rate, but because of that, isn't that a more accurate determiner of exertion or stress? I could do my training at 85% of my heart rate, but not 85% of my power. What are your thoughts?
How much riding have you done prior to your FTP test?
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Old 02-06-09, 02:23 PM   #3
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I have been on the trainer 3 times a week for 1 hr. each time Since January. This is however after a 6 month layoff.

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Old 02-06-09, 03:22 PM   #4
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I would use heart rate as your guide unless you have a power tap/SRM. using the power curve charts is innacurate at best
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Old 02-06-09, 04:14 PM   #5
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I would use heart rate as your guide unless you have a power tap/SRM. using the power curve charts is innacurate at best
The KK power charts are supposed to be within about 3% of actual power so you should it shouldn't have a problem using those.

I assume you are using a big fan as overheating (and increased heart rate) are a common problem for indoor riding.

If you're only getting 3hrs a week to ride try backing off on the intensity a little. Or better yet try riding every day and mix up the workouts. Some shorter intervals and more time at 75% of FTP. As you get stronger you can add in more intensity.

Personally, I don't think 2x20 FTP tests are advisable until you've got some reasonable miles in your legs.
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Old 02-07-09, 07:57 AM   #6
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I am using a fan, but I guess I thought I could pick up where I left off. Maybe too hard to soon. I'll try backing of and do some longer rides on the trainer at lower intensities.

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Old 02-07-09, 05:32 PM   #7
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skin temp makes a lot of diff. I have the same trainer (love it) and outside I average about 30-40 watts more at a given perceived effort, even with a fan inside.
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Old 02-08-09, 06:47 AM   #8
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Wow, that's encouraging. I couldn't believe I was that weak after the test. I looked up the cadence and gear ration's I was using on Sheldon Brown, and it appears that my Garmin was displaying the wrong speed by a few MPH. So in the end, I was trying to ride 25 watts above my FTP. No wonder it felt so hard.
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Old 02-20-09, 08:04 PM   #9
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The KK power charts are supposed to be within about 3% of actual power so you should it shouldn't have a problem using those.

I assume you are using a big fan as overheating (and increased heart rate) are a common problem for indoor riding.

If you're only getting 3hrs a week to ride try backing off on the intensity a little. Or better yet try riding every day and mix up the workouts. Some shorter intervals and more time at 75% of FTP. As you get stronger you can add in more intensity.

Personally, I don't think 2x20 FTP tests are advisable until you've got some reasonable miles in your legs.

The power as calculated by the KK equation is usually within 5 watts or so of my actual power, so I'd agree w/ the 3%. The first 10 minutes or so it's a little off, but after that it's pretty solid. This is using 2 1/2 turns tightening after the tire initially touches.


It's WAY more accurate than using HR. My HR for a similar power interval can vary by close to 10 bpm depending on my fatigue level, and the second 20 minute interval is usually 5-10 beats higher than the first for the same RPE.
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