Microgate Optogate User Manual page 143

The OptoGait device is not installed correctly: if during a performance of a test, the
OptoGait device is badly positioned on the ground, or the ground is particularly uneven,
invalid flight or contact times may occur;
The patient knocks against the device: if during the test the patient knocks against the
device without causing it to lose its alignment, this may only temporarily generate some
invalid times;
The patient exits the measurement area: in very long tests, the patient may exit the
measurement area for one jump and then re-enter the area.
In these cases it may be convenient to keep the test and make a manual/automatic correction to
times rather than repeat the test itself.
In fact, the OptoGait program contains an automatic and manual system for managing spurious
times acquired during a test. Checking for spurious times is only done on flight, step, and contact
times, with any external times always considered as valid.
The basic criterion is that acquired times are always coupled with (contact time) + (flight time or
step time). Flight or step times without a corresponding contact, flight or step time are only possible
at the beginning or end of a test contact (because of the start or finish type set in the test).
In the case of a very brief contact, flight or step time, there is an automatic procedure that identifies
any invalid times, (i.e., below a certain threshold). This threshold can be set or deactivated (see
chap. 4.4.1.2 Jump Test Configuration).
If there are other errors that are not automatically deleted, it is possible to manually correct them:
select the row with the invalid contact, flight or step time and delete the entire row (and thus the
contact-flight time couple). As a result, such values will not be considered in the calculation of
average values and will not appear in the charts.
In these cases add the contact-flight time couple to the flight time of the previous contact-flight
time couple, if it is the contact time that is not average, or add the contact-flight time couple to the
contact time of the following contact-flight time couple, if it is the flight time that is not average.
The following chart clarifies this concept:
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