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wattage on rollers vs on hill outside(8 posts)

wattage on rollers vs on hill outsidemtber
Feb 6, 2003 12:23 PM
I have been doing low LT workouts outside, on a hill, and generating ~200W @ 156 avg HR. Today I was forced to ride rollers inside, also @ 200 W. My avg HR turned out to be 168 @ 200W and the perceived exertion was much higher. I am well rested and not sick so I was wondering what's up?

The only thing I can think of is that on rollers I use NO upper body at all, while climbing outside, I pull quite a bit on the hoods. Would the extra strain all on the legs instead of spread out btwn the arms, back and legs be enough to raise my HR this much? Thanks in advance to anyone with an explanation.
re: wattage on rollers vs on hill outsideJon Billheimer
Feb 6, 2003 1:47 PM
In order to attain a 200 watt power output on the rollers was your cadence higher than on the hill? If so that would explain the difference in heart rate.
re: wattage on rollers vs on hill outsidemtber
Feb 6, 2003 2:33 PM
I think it was ~103 on the rollers, ~90 outside. would that account for the 12 beat diff?
re: wattage on rollers vs on hill outsideJon Billheimer
Feb 6, 2003 2:39 PM
I think that would account for quite a bit of the difference, depending on what your normal cadence is. The other thing is that a whole host of factors can affect heart rate variability at a given power output, up to 20 bpm according to some research. Things such as your state of training, ambient temperature, humidity, barometric pressure, diet, time of day, time since last meal, etc., etc.
re: wattage on rollers vs on hill outsideirregardless
Feb 6, 2003 3:02 PM
Another factor is how much energy is being used to keep the bike upright while going uphill. When going up a steep grade on a bike with a lot of trail, a lot of energy can be expended just trying to keep the bike upright. That probably wouldn't be that big of an issue at 90 rpms, however.

I also agree about the different cadence. Try to see how your heart rate differs on your rollers when you try to maintain the same wattage at different cadences. You may find that a certain range of cadences is more efficient than others.
re: wattage on rollers vs on hill outsidejradford
Feb 6, 2003 2:56 PM
how about the temp difference from inside to outside. when riding inside you should have fans to replace the wind you would get from riding outside to cool your body. If the temp was hotter and no wind to cool you down you could have had cardiac drift. your body has raised its heart rate not because you are doing more work but because it was trying to cool itself down.
re: wattage on rollers vs on hill outsidemtber
Feb 6, 2003 2:59 PM
good point. i do use a fan, but it was considerably warmer inside (even w/ the fan) than out.

I still felt like the overall RPE was much tougher inside, though, maybe cuz of boredom.
rollers vs outsidecyclopathic
Feb 8, 2003 1:09 AM
rollers, magnetic trainers etc do not emulate road feel.
They give you more leveled resistance then road esp when you stump on pedal.
This effectively uses more secondary muscles and lowers power output per BPM.