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PostPosted: Thu Jun 27, 2013 10:16 pm 
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Joined: Fri Apr 13, 2012 7:25 pm
Posts: 87
I've been riding with my power meter for more than a month now and find it incredible hard to keep a somewhat steady output when doing longer intervals (threshold), even on my trainer.
The average power for my intervals usually ends up within +/- 10% of what I planned, but when I checkout my data afterwards, my power curve is one giant sawtooth with serious time spent far above my intended power.

On the bike I try to pace myself with the 3s avg. power use 30s+lap avg. power to see a "trend" of how I am doing.

But how do you learn to ride economically to avoid the sawtooths in power output? Higher cadence? Mashing? Pedal-hold-pedal?


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PostPosted: Thu Jun 27, 2013 11:47 pm 
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Joined: Sat Mar 14, 2009 6:08 am
Posts: 8181
Location: Geelong
What PM are you using?

What head unit?

What trainer?

What interval length?


etc.


We need that info first mate.

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PostPosted: Fri Jun 28, 2013 2:10 am 
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:idea: Could be due to a less than perfectly round pedaling action which applies a perfectly constant force throughout the entire pedal revolution. +-10% seems like a lot of variance, but it would be incredibly difficult to maintain, say, a 300 + watt interval within 5 watts. Somewhere in between seems acceptable.


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PostPosted: Fri Jun 28, 2013 7:21 am 
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Tinea Pedis wrote:
What PM are you using?
What head unit?
What trainer?
What interval length?

Crank based power meter (Power2Max) with a Garmin head unit. Trainer is an Elite magnet based one. Intervals usually 2x20 or 1x40 done outside. I don't think that any of the gear is faulty and that the problem instead lies within my technique.

bricky21 wrote:
:idea: Could be due to a less than perfectly round pedaling action which applies a perfectly constant force throughout the entire pedal revolution. +-10% seems like a lot of variance, but it would be incredibly difficult to maintain, say, a 300 + watt interval within 5 watts. Somewhere in between seems acceptable.

I am far from the smoothest rider, but I dont think the spikes are due to my pedal stroke. I often ride at FTP on the flat, just to look down at the Garmin a moment later with 3s power spiking 50% above FTP.

How tight wattage ranges should you be able to keep within on a flat road for somewhat normal conditions (no traffic, little wind and no sudden hors categorie climbs)?


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PostPosted: Fri Jun 28, 2013 8:59 am 
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Location: Geelong
It's the same on road as the trainer?

I use 3sec power for my pacing/training/pretty much everything. 30sec is too long.

Able to post a screen shot of a typical session? Road and trainer.

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PostPosted: Fri Jun 28, 2013 10:20 am 
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Hi again,

I'll try to sort out some graphs and post!

I thought about the possibility of my FTP being too low, as whenever I am fatigued after a long ride or applying force enough to ride within what is now Z5, I find it so much easier to keep a steady power. Doing 2x20 intervals at 95-100% of FTP shouldn't feel easy, right?


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PostPosted: Fri Jun 28, 2013 2:16 pm 
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Location: Geelong
z5 is Vo2 max. So yes, sounds like FTP is too low for starters.

When was the last full-noise 20 minute test?

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PostPosted: Fri Jun 28, 2013 3:35 pm 
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My power graphs also look spikey. I just go by 3-sec ave, power readout and also have "lap power" displayed.
If you zoom in to a short interval it will look less spikey, but still seems a lot more variable than it feels while doing it.


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PostPosted: Sat Jun 29, 2013 12:26 am 
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Location: Geelong
Here is a shot of a 20 minute interval of mine (on my Lemond trainer) this week

Image

if yours looks like this, I think you've nothing to worry about.

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PostPosted: Sat Jun 29, 2013 1:02 am 
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Joined: Tue Sep 20, 2011 12:54 pm
Posts: 395
Location: Haines, AK - Temporarily
FWIW: When riding on a trainer with power, if I try to maintain a set power - it's more variable than I'd like. If I try to maintain a cadence, things smooth out more.


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PostPosted: Mon Jul 01, 2013 5:11 pm 
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Joined: Fri Apr 13, 2012 7:25 pm
Posts: 87
Tinea Pedis wrote:
Here is a shot of a 20 minute interval of mine (on my Lemond trainer) this week

if yours looks like this, I think you've nothing to worry about.


Thank you!

I did a 2x20 yesterday on the trainer after increasing my FTP about 10% and increased the sampling rate of my Garmin (which somehow got reset to a low value in an update) and now my files look much smoother again!


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PostPosted: Tue Jul 02, 2013 1:08 am 
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Location: Geelong
1 sec sampling is what you need to have it on. Not smart recording.

And include zeros.

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