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Fitness

How to Build a Better Pedal Stroke

How often have you heard the advice to pedal in circles? I decided to put this to a personal trial and have been using all sorts of measurements to examine and improve my pedal stroke.

Simon Kidd

Written by Simon Kidd Last updated on Nov 22, 2021

How often have you heard the advice to pedal in circles? This seems a logical statement considering that the means of propelling a bicycle is to rotate the pedal cranks and the only way to do this is to apply a force that is acting at right angles to the crank.

Our legs are very good at pushing down using the large quadriceps muscle group, calf muscles (gastrocnemius and soleus), and gluteal muscle groups. However, the muscles that perform the actions to pull backwards and up (hamstrings group, hip flexors, and anterior tibialis) are a lot weaker.

If we were to plot the force applied to the pedals as they rotate through a full circle, we get a diagram that looks like this:

pedal stroke, improving pedal stroke, better pedal stroke, pedalling, cycling

The chart (produced on a Computrainer) shows the amount of torque applied to the rear wheel as the pedals rotate.

The top of the diagram represents the right pedal at top, the bottom is for the right pedal at the bottom and the three o’clock position is for the right pedal horizontal forwards. We can see that the maximum torque is applied when the pedals are nearing horizontal and the downward force from the legs is near right angles to the pedal crank. When the pedal has reached the bottom of the stroke, the large force to push down on the pedals has no benefit since at that point the pedals need to move backwards. If you have stronger legs that can push hard at the horizontal pedal position, a high torque can be applied and then more power can be transmitted to the wheels, and you go faster.

The advice to smoothly pedal in circles, makes the reasonable assertion that by deploying a range of muscle groups to apply force for the full pedal rotation (push down, pull back, pull up, push forwards) more energy can be applied – or more efficiently applied – than simply pushing the pedals down. From a qualitative perspective based on my own experience and that of those I coach, trying to apply a more circular pedalling pattern certainly seems to increase speed. Although I have been unable so far to find much independent research that would support the efficacy of a more circular pedalling style.

So, this year I thought I would put some numbers on this in a personal trial. My hypothesis is that if I could “improve” my pedal stroke, this could be shown by being more efficient at a fixed power and cadence. Over the next few weeks I will be trying to improve my pedal stroke expecting to see some greater efficiency. Initially, I analyzed my pedal stroke after a warm-up during a five-minute session holding 200 watts at a cadence of 90rpm. I then repeated this test while attempting to pedal in a more circular manner, and again at the end of a 45-minute interval set.

The first picture (above) was from my first session. It shows that my maximum pedal force is a little late, as the pedal has already passed the horizontal position. Both legs are similar, producing equal amounts of power, but the left leg has a slightly better ratio of peak to mean power (59 vs. 56). My end heart rate was 142 beats per minute.

This next picture is from my attempt at pedalling more effectively:

pedal stroke, improving pedal stroke, better pedal stroke, pedalling, cycling

The diagram looks slightly more rounded and the peak to average torque ratios are slightly higher (58 vs. 62). I did find this required significant concentration and it did feel harder as muscles were recruited in a slightly different manner. This is also reflected in a higher heart rate.

The test at the end of the interval set was very similar to the first test.

It takes several thousands of repetitions to recruit muscles in a slightly different way and so I was not expecting an immediate improvement. While it may subjectively allow me to create more power out on the road, trying to pedal in an unnatural, more circular pattern than normal was actually less efficient for me as exhibited by the higher heart rate. It takes several thousand repetitions to acquire a new motor skill, and up to 91 days according to research by Philippa Lally, so I should only be expecting a natural improvement by practicing over a significant time. Thus, I will be practicing this over the next few weeks and report back in another article.

A lot more information can be obtained from a pedal stroke analysis and I will be looking at that next time. Have you experimented with your pedal stroke? What has your experience been? Post to the comments below.

References:

1. P. Lally, et al, “How are habits formed: Modeling habit formation in the real world,” European Journal of Social Psychology, (2009) 1009, 998-1009.

2. Stig Leirdal and Gertjan Ettema, “Pedaling Technique and Energy Cost in Cycling,” Medicine & Science in Sports & Exercise, (April 2011) 43:4, 701-705

3. EF Coyle EF, et al, “Physiological and biomechanical factors associated with elite endurance cycling performance,” Med Sci Sports Exerc. (Jan 1991) 23(1):93-107.

Photos courtesy of Shutterstock.

Simon Kidd

About Simon Kidd

Simon Kidd is a qualified cycling coach, personal trainer, and sports massage therapist. But, it hasn’t always been that way. Starting with a career in electronic engineering, software design, IT, and program management, Simon decided around the age of forty that something had to be done about the expanding waistline and general lack of fitness.

That decision led to a journey through free diving and finswimming initially. Having found a rather late aptitude for some sports, Simon trained under the direction of coaches in England and Russia (along with personal research into sports training and programming) to compete in the first Commonwealth Finswimming Championships. Coming away with some medals convinced him that given the right conditions, training programs, and guidance there should be no barrier to people fulfilling their fitness goals and performing well in sports whatever their backgrounds.

Following a swimming pool accident, Simon took up cycling, restoring his old cycle that had remained dormant in the shed for many years, and again began to train and compete in local events. Wishing to take this further he then qualified as a personal trainer, sports massage therapist, and cycling coach. Using these skills, along with a 'project management approach,’ Simon has helped many local club cyclists and aspiring national competitors work towards their goals.

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