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Determination of LT Power on iMagic

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Determination of LT Power on iMagic

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07-01.-2006, 01:09 AM	#1
CUBE Registered User Join Date: Jan 2006 Posts: 18	Determination of LT Power on iMagic Hey all, Ive bought a Tacx iMagic trainer a few weeks ago here in the Netherlands to avoid cycling outside. The sun was shining yesterday so I went out on another bike and had a crash, I'm fine but the bike has been better.... anyway, i/m using the imagic mainly just for fun, but since it has a power meter on it, I thought I would like to determine my LT power. I read here that the average power produced over a 40 km TT effort equals this number. My max HR is about 190 so LT HR is about 173 (91%). After a warmup I cycled for 40 km on the Tacx and these are the outcomes: speed: max 61.0 avg 52.8 power max 348 avg 291 cadance 120 max 104 avg Heart Rate 182 max 175 avg The thing is after a little more than 45 mins I finished, and of course would this be done on a flat road outside, it would take a lot longer... so how should I interpret this data? thanks already

07-01.-2006, 01:28 AM

acoggan

Registered User

Join Date: Jul 2003

Posts: 2,617

Re: Determination of LT Power on iMagic

Quote:

Originally Posted by CUBE

Hey all,

Ive bought a Tacx iMagic trainer a few weeks ago here in the Netherlands to avoid cycling outside. The sun was shining yesterday so I went out on another bike and had a crash, I'm fine but the bike has been better....

anyway, i/m using the imagic mainly just for fun, but since it has a power meter on it, I thought I would like to determine my LT power. I read here that the average power produced over a 40 km TT effort equals this number.

My max HR is about 190 so LT HR is about 173 (91%).
After a warmup I cycled for 40 km on the Tacx and these are the outcomes:

speed:
max 61.0
avg 52.8

power
max 348
avg 291

cadance
120 max
104 avg

Heart Rate
182 max
175 avg

The thing is after a little more than 45 mins I finished, and of course would
this be done on a flat road outside, it would take a lot longer...

so how should I interpret this data?

thanks already

The power-duration curve is generally quite flat by the time you out that far*, so I'd just call your functional threshold power 290 W and get on with the training. (Of course, that assumes that your iMagic is accurate and that your power wasn't reduced as a result of being indoors on a trainer.)

*Indeed, this is precisely why I've defined functional threshold power the way I have, as shorter tests (e.g., 20-30 min) more prone to bias or "contamination" due to differences in anaerobic capacity between/within individuals.

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