Comments on: ICI Podcast #47 – Dennis Keiser Talks Indoor Cycling with Power on an M3

By: AnnieFarley

AnnieFarley — Fri, 29 May 2009 15:47:01 +0000

Just finished listening to the podcast…great info! We have a studio full of Keiser bikes..new to us this fall, at one of the gyms where I teach! They are remarkably quiet..which is great since we do not have a headset! I have heard a lot of positive comments from our members about the bikes..and the computers as well. I love being able to refer to cadence without a cadence check/metronome! On the flip side, the handlebar adjustments are a bit tricky for some as they do move away from you as you bring them up….
but it seems to be an issue for just a couple of our riders thus far…and I do have other bikes to put them on!

Thanks again for another good show!
Annie

By: Dennis Keiser

Dennis Keiser — Tue, 26 May 2009 19:41:08 +0000

Thank you for catching this. We were so focused on the fact that the Force doesn’t get harder and may even get easier with increased Speed that I didn’t make clear what was happening to the work. Work = Force X Distance, and when more Work is done in a given time, more Power is produced and your heart rate goes up. Your heart rate is driven by the Power you are producing and an increased cadence with the same force will require you to produce more Power.

Where work remains constant is when we think of going from point A to point B pedaling at a given force. If Rider A goes from point A to point B in 30 minutes and Rider B does it in 60 minutes, both riders did the same amount of Work (providing the pedal force is the same), but Rider A produced double the Average Power, because Rider A did the same amount of Work in half the time.

I hope this helps.

By: Spook

Spook — Thu, 21 May 2009 02:24:20 +0000

This was a really good show. I learned a lot. During the podcast it was mentioned that if you increase you speed on a spinner bike and not change the resistance, you are doing the same amount of work. However, your heart rate will climb and breathing will become stronger. I do understand that you are still pushing the pedals around using the same effort. SO I am not sure how these two statements fit together.

I also what to comment about creating circles. I believe this means creating push power throughout the entire pedal stoke on both sides. If so using a higher resistance with a little slower cadence, wouldn’t allow you to work a good circles.

Please let me know if I am in the wrong ballpark. Thanks