Strike Angular Range (Strike AR) is the angular range of the shin from maximal forward extension until initial ground contact.
Strike AR is a unique Motion Performance Indicator (MPI), available only with LEOMO products. |
Summary
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Strike AR indicates the range of motion from which potential downward force can be generated.
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Increased Strike AR could reduce the overall braking force at foot strike.
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Strike AR improvement should be attained through running drills rather than focusing on stride adjustments.
Why Strike AR is important
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Higher range leads to more propulsive force generation potential.
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A larger Strike AR can be expected to bring the landing position closer to the body's center of mass. This may also improve Ground Contact Time and Heel Pitch, leading to a reduction in braking force.
About the value of Strike AR
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Strike AR is measured in degrees, indicating the angle of movement.
- Elite runners have been shown to have higher Strike AR values at similar speeds compared to recreational runners.
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Since the movement is estimated from the sensors in the shoe, the error may be large depending on how you run.
Angular ranges |
Class |
Visual Reference |
---|---|---|
0° – 3° |
Low |
Minimal shin angle. |
3° – 6° |
Moderate |
General running. |
6° – 9° |
High |
Increased shin angle. |
> 9° |
Exceptional |
Maximal shin angle. |
Sensors
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Foot placement
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Attach sensor clip to shoes with shoelaces.
- For best results, attach the sensor clip at the midfoot.
Examples
Imperfect examples
The following example, from a long run with marathon tempo, has low Strike AR values across run and lacks any Strike AR increase during the speed increase, between “easy” and “tempo” stages.
The same athlete has low values across all stages, with very small Strike AR increase when the speed is increased.
Great examples
The following example is a tempo run from an elite marathoner.
The athlete has consistent values during the full tempo set, with moderate Strike AR average values (4° – 7°).
For long durations, is important to focus on sustaining this Strike AR range at race pace, while meanwhile, increase the symmetry of the values between left and right foot.
Another great example from other elite athlete during a tempo run, with a progressive ramp in pace.
In this athlete's case, there is a difference between right and left, but the value of Strike AR increases as the speed increases. It's proof that he is making the right moves to increase his speed.
Improvements:
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Identify the cause of weakness in the left leg.
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Focus on Strike AR increase during intervals at high speeds, and then slowly incorporate that focus at progressively lower speeds.
Real-time data & analysis
Strike AR can be observed in real-time.
Coaches can access the scores in real-time with LEOMO LVS.
Related
Part of the Stride Cycle, together with: Heel Pitch, Recoil AR, and Thigh Swing Speed.
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