Users Manual Part 3

DEAD SPOT SCORE (DSS)
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rating
motionDisplay
Motion Performance Indicators
0.0
10.0
Optimum pedaling with little to no
dead spots
Unsmooth pedaling
Extremely unsmooth pedaling
27
>20.0
SCORE
The center value shows the total sum of
magnitudes (measured in degrees/sec) of the
dead spots that occurred in a single pedaling cycle.
Each dead spot is represented along the pedaling
stroke, with the size showing the magnitude of
deviation from a smooth angular velocity.
Left DSS (total for one cycle)
Right DSS (total for one cycle)
Dead spot Location and Magnitude (Dark
Circle = Last cycle, Light Circle = Previous
cycles)
Summary
Dead Spot Scores (DSS) pinpoint the magnitude
and locations where pedaling velocities lack
smoothness along the left and right pedaling
cycle.
- Lack of smoothness is a secondary symptom of
sub-optimal pedaling motions.
- Looking at the right and left DSS values provides
insight to left/right movement imbalances.
DETAILS
A “dead spot” is where pedaling power is lost
when sub-optimally shifting from one movement
pattern to another during a pedaling stroke (such
as the shift between the power and recovery
phase).
Optimal pedaling motions are smooth and apply
less stress to the body than sub-optimal pedaling
motions. DSS is measured by the foot’s angular
velocity, where any deviation from a smooth
angular velocity sine curve is considered a dead
spot. Each dead spot is represented along the
pedaling cycle by a lled circle, and a circle’s size
indicates the magnitude of deviation.
Since dead spots are caused by many factors, a
trained coach must nd the primary cause of a
high DSS. One known cause of a high DSS is the
overuse of less powerful secondary muscles (such
as hamstrings) over larger primary muscles (such
as the glutes).