THE ANGLE OF PEAK FORCE:
The angle of peak force is the point in the pedal stroke where you deliver the most power. This data is provided for the both the left and the right leg and can be anywhere between 90 and 180º, but preferably when riding at an optimal cadence and gearing, this range becomes narrower and should be between 100º and 120º. However, the most important thing in regard to the angle of peak force is that both legs must be similar to one another so that you are not favouring a specific side and not suffering from an imbalance.
PERCENTAGE POWER DISTRIBUTION FROM EACH LEG:
The Wattbike also tracks the percentage of power which is being distributed from both the left and the right leg. In an efficient pedalling technique you would be producing 50% of your power from your right leg and 50% of your power from your left leg. However, working within the range of 48-52% still shows a relatively efficient pedalling technique.
THE FORCE CURVE SHAPES:
Finally, the wattbike also displays your force curve shape. Imagine if the pedals were being turned by a robot, the graph would show a circular shape, indicating there is an even distribution of force applied at all points throughout the pedal stroke. However, humans are not able to produce the same amount of force throughout the pedal stroke due to the muscle groups involved. The quadriceps are the primary muscles groups used to extend the knee and the hip during the downward pedal stroke. During the reverse motion, the hamstrings are the primary flexion muscle group activated between 6 and 12 o’clock of the pedal stroke to help bend the leg and bring the pedal back to the top. Due to the flexion muscles being weaker than the extension group of muscles, the optimum shape of the force curve would be similar to a sausage shape.
Below are some of the possible shapes you may see on the watt bike and what they represent:
PRO CYCLIST (ITALIAN STALLION):
This shape indicates a perfect pedalling technique. The large rounded shape shows a consistent pedal stroke where the rider is activating all the correct muscle groups and also able to maintain a good momentum throughout the transition between legs. It also shows a perfect balance and a similar angle of peak force between both the left and right legs. This is an efficient pedalling technique with very little energy being wasted.