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PhysiGait Lab user manual v1.3.1 Date: 29.04.2019
Copyright ©2018, All Rights Reserved - Gait Up SA. CH-1015 SWITZERLAND
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6. Gait Parameter Overview
Below you can find the description of the spatio-temporal output parameters of the PhysiGait
Lab system.
6.1
Essentials
The report directly accessible after the gait test from the tablet contains 3 essential gait
parameters with a colour-bar situating the result with respect to reference data. The values
are based on the result of the right foot of the patient.
Speed [m/s]
, the walking stride velocity is the mean speed of forward walking,
calculated in meters per second.
Variability [%]
is the coefficient of variation of cycle duration in percent. It is
calculated as SD/mean and is only computed when 10 gait cycles or more are
analysed.
Asymmetry [%]
is the ratio of swing which compares the time in the air for the two
feet, in percent. A perfect symmetry outputs a value of 0%. The asymmetry is
calculated as:
𝑆𝐼 =
𝑆𝑤𝑖𝑛𝑔
𝑙
−𝑆𝑤𝑖𝑛𝑔
𝑟
0.5∗(𝑆𝑤𝑖𝑛𝑔
𝑙
+𝑆𝑤𝑖𝑛𝑔
𝑟
)
∗ 100%
6.2
Temporal Analysis
Cycle time [s]
is the absolute recording time when the heel strikes the
ground. If you are recording a trial with several exercises of particular
duration
(30s, 1min, …), it can help you find the moment where the patient
changes exercise within the entire trial. It is however still recommended to
create one file per trial as mentioned in section 3.3.
Cycle duration [s]
is the duration of one cycle (from heel strike to heel
strike of the same side).
Cadence [steps/min]
is the number of cycles in a minute. Cadence is
different from speed, since a small person may have to walk with a higher
cadence to have the same speed than a much taller person.
Stance [%]
is the portion of the cycle during which part of the foot touches
the ground. Normal stance is around 60% of gait cycle duration.
Swing
[%]
is the portion of the cycle during which the foot is in the air and
does not touch the ground. Normal swing is about 40% of gait cycle duration.
Loading phase [%]
is the portion of the stance between the heel strike and
the foot being flat on the ground.
