Left/Right Power?

Left/Right Power?

Postby lbville » Tue Feb 21, 2017 11:30 am

Maybe I'm missing it but is there a way to see power generated by left leg vs. right leg in Isaac? I see wasted watts, etc (yikes, btw) but would love to be able to see L/R power.
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Re: Left/Right Power?

Postby tangible » Mon May 08, 2017 3:31 pm

New User, PowerPod w/Powerstroke option received two days ago.

I have the same question! Hopefully our friends at Velocomp will reply.
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Re: Left/Right Power?

Postby Velocomp » Mon May 08, 2017 4:11 pm

The left and right legs of most cyclists do not apply power equally as they turn the crank, nor is each leg equally as strong.

If you look at the crank plot of PowerStroke you'll see how your left and right legs apply power, every 10 degrees as you turn the crank. The PowerStroke distribution shows how your legs are accelerating the bike, as you turn the crank.

If one leg is stronger, then more acceleration dots from that leg will extend outside of the green oval.

If one leg is "lazy", then the number of dots outside the circle will be fewer.

If your legs are equally balanced, if your cycling technique is strong, and if you have a great bike fit, then the dots will adhere very nearly to the green oval at nearly all points.

That's what PowerStroke tells you.

In the image below, from one of my recent bike rides, my right leg is doing a lot more work than my left leg--both in terms of strength, and in terms of the amount of time it is working.

So, I need to work on my left leg.

The other guys give you a simple L/R power split. Why nothing more? It's because strain gauge sensors can't usefully measure what is really going on.
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Re: Left/Right Power?

Postby GooseRider » Sat May 13, 2017 5:14 pm

John,

Thanks for the explanation! Would still be interesting to see a balance number. It would even be cooler if one could see balance in the Garmin headunit in real time. Don't know if you are able to distinguish with enough accuracy to do that?

Thanks,

Morten
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Re: Left/Right Power?

Postby ronpei » Sun May 14, 2017 7:36 am

since the power pod/ Newton is capturing power reading at such a high frequency, one would think that it would be rather trivial math to add a line in the power stroke display that captures the left right balance as a percentage? Just one more piece of info to improve pedaling dynamics. If a user has power stroke it would be a nice metric to add to the main page as an average for the ride?
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Re: Left/Right Power?

Postby TuRu00 » Mon May 15, 2017 9:18 am

I am agree, PowerStroke it is a great feature but I think that a step ahead could be done...

1) Reading, writing into .ibr and broadcasting (via ANT+) the balance, torque effectiveness and pedal smoothless data from a DFPM.
2) Using that data, if available, to complete PowerStroke analysis. I think that a good pedal stroke it is not just about the motion of a handlebar, specially the torque effectiveness of the pedal stroke combined with the motion can help to improve (and train) the pedal stroke.

What do you think?

Thanks!
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Re: Left/Right Power?

Postby Velocomp » Mon May 15, 2017 11:03 am

This is not as simple a calculation as it might seem. Isaac is doing a h*** of a lot of processing in the background.
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Re: Left/Right Power?

Postby ronpei » Tue May 16, 2017 6:29 pm

I do not discount that the power stroke is doing a lot with respect to dealing with the accelerometer data and using an algorithm to translate that into what you show with respect to timing it to the right and left pedal stroke based upon the position of the left crank arm, and maybe I am being optimistic. I thought that you had said that you capture the power data , which I do understand is a complex calculation, at a frequency faster than 1 per sec. So it may be that the calculation to get a power number more frequently than once a sec, at a minimum of 20 data points per second. So yeah that might be a bit too much to get a wattage that hits that frequency or higher, one could probably figure out which leg is which, but again there has to be a trigger signal from the cadence sensor to align thing to make it all easier. Anyhow this right left balance data or graph, be it sinusoidal or a spider graph would be really more informative to me or in addition to the current data so that I can see this alone or in addition to the current display. That would be very positive and allow you to go head to head with the so called dual sided or other strain gauge metres that give a traditional left right balance... just more apple to apple is all I am saying. I realize it may be a lot to ask for but what the heck, it is worth a try.
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