The Power Phase of the Pedal Stroke

Knowledge of the Power Phase of the pedal stroke is crucial, and by following these tips you will be able to maximize it!

If you are satisfied in the ability to just take a ride, not concerned with how to make yourself faster, ride longer with less fatigue or discomfort, and avoid injury, your carefree spirit is admirable.  

If like me, however, your prevailing daily thought is much to the contrary, and knowledge of the pedal stroke and the muscles used during it, is perceived to be of utmost importance.  

Spoiler alertIt’s not all about the quads!  

Read on to determine why and what you can do to optimize your power, efficiency, and comfort while “turning the pedals in anger.”   

 

Phase One of the Pedal Stroke – The Downstroke

Often referred to as the ‘Power or Extension Phase’, the Downstroke is the portion of the pedal stroke between 11 and 5 o’clock (300 through 140 degrees). The downstroke is considered the most important phase and the portion of the stroke in which over 90% of your power is generated while cycling.

The glutes produce powerful hip extension, while the quads produce knee extension, and together they work to extend your leg and generate force downward into the pedal during the initial phase of the pedal stroke. 

 

 

The Role of the Quads

The quads activate just slightly before the top of the stroke (around 11 o’clock) and begin to extend the knee, reaching maximum force production at ~2 o’clock (60 degrees). The force produced by the quads reduces significantly at ~3 o’clock (90 degrees) and ceases altogether at ~4 o’clock to allow for pulling back on the pedal.

 

The Role of the Calves

The calf muscles are utilized to counteract the external forces pushing the toes up and heel down and prevent the heel from dropping at ~3 o’clock (90 degrees). Weak calf muscles can be a major reason for heel drop and loss of power during the downstroke.

During the transition between the downstroke and the upstroke, referred to as the backstroke, the calf muscles are fired to point the toe. At the bottom of the stroke, the toes should be pointed down 20 degrees to ensure that all of the power produced during the downstroke is put into the crank.

This technique is referred to as ‘ankling’ and was popularized by Greg LeMond when he said, 

“Act like you’re scraping mud off the bottom of your shoe.” 

The Role of the Hamstrings

During the majority of the downstroke, the hamstrings are activated to stabilize the knee to coordinate motion, ensuring smooth action and controlling the direction of force transferred to the pedal.  This is similar to the role of the calf muscles until the transition to the bottom of the stroke requires their activation to facilitate an optimal transition to the next phase, the backstroke.

The hamstrings are also activated to extend the hip as you come over the top of the stroke. The key is to drop your heel at 12 o’clock, going from a position where your toes are pointed down about 20 degrees, to a heel position 10 degrees past parallel by the time you reach 3 o’clock.

 

The Role of the Glutes

The glutes, which consist of the maximus, medius, and minimus, are the largest muscle group in the body, and crucial to providing powerful pedal strokes.  In addition, they control the rotational motion at the hip and stabilize the knee.    

The glutes activate at the top dead center of the stroke (12 o’clock or 0 degrees) and remain active during the entire down stroke.  Peak power production occurs at ~4 o’clock (120 degrees) where the combined force of the glutes, quads, and hamstrings is maximized.

 

 

Are the Glutes Our Most Important Cycling Muscle?

The glutes are perhaps the most important muscles to consider when trying to optimize your pedaling power and efficiency.   Here’s why:

  • This large and powerful muscle group, which is activated almost 50% of the time while pedaling, is accountable for over 25% of the force generated.

 

  • Weakness and fatigue of the glutes will limit force production and impair performance.

 

  • Increased force production by the glutes is required while climbing in the saddle and out.

 

  • They are vital for knee health because pedaling is mostly a single plane movement (with very little rotation of the leg), and if rotation at the hip isn’t controlled, the quads and hamstrings will be forced to compensate causing them to become overworked, leading to knee instability and overuse injury.

 

  • Prolonged trunk flexion while cycling causes tightening of the muscles of the front of the thigh (hip flexors) and reciprocal inhibition of the elongated glutes, causing them to become weak and rapidly fatigued.

 

  • Sitting while at work or home can also cause shortening of the hip flexors, and as the glutes lengthen the ability to contract their muscle fibers is reduced.

 

  • A condition known as Dead Butt Syndrome (gluteus medius tendonitis) can occur due to the muscle imbalance caused by prolonged seated postures when the aforementioned goes unaddressed.

 

Tips for Maximizing Glute Muscle Function

  • Perform a consistent stretching and foam roller program focused upon the hip flexors, while also including the hamstring, calves, and quads.

 

  • Strengthen the glutes through an exercise program designed to isolate the muscle group and improve its endurance. 

 

  • Utilize a muscle activation program to prepare the glutes for optimal function before activity performance.

 

  • Concentrate on pedaling with a smooth stroke at a higher cadence to prevent from pushing too hard, because a tired glute muscle responds exactly like a weak one.

 

  • Keep your core muscles strong to provide a stable base for your glutes and the other muscles of your legs.

 

  • Make sure that your bike is fitted properly to avoid being overly stretched and placing excessive lengthening stress upon your glutes.

 

  • Sit deep in the saddle and drop your heel while applying force to the pedals, while at the same time thinking about engaging your glutes while you do so.

 

  • Adjust your workstation to make sure that it is ergonomically sound to correct a tendency towards a slumped posture, and take frequent standing breaks to stretch (every 20 minutes).

 

Conclusion

When most cyclists think about the muscles used while pedaling, thoughts immediately turn to the quads and getting them as strong as possible.  In actuality, the quads play an important role in our performance, but it doesn’t stop there.

The other muscles of our lower body, the hamstrings, and calves, which often go overlooked, play a part and must be strong to provide force and maintain stability.

Most important, however, is the role that the glutes play in maximizing our cycling performance and preventing injury.  It is essential not to neglect your glutes if you want to ride strong and not have pain in the process.  

Doing so will result in decreased power production during the downstroke, rapid fatigue, and progressively worsening soreness of the back and joints.  That is no fun at all!

 

Your thoughts?

Did you know how important the glutes were to your riding?  If not, does it change the way you will prepare and ride in the future?

 

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