SmarTracks Diagnostics v.3.16 Installation Guide & User Manual
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varying the fall height. The output (jump height or the ratio of jump height and contact time on the
ground) is maximized with optimal input (fall height).
The fall height is usually raised in 15 or 20 cm (
6” or 8”) steps and optimal height depends on the
athlete’s ability to absorb and transform the occurring forces. If the measured contact time exceeds
250 ms, the height should be decreased.
Measuring parameters:
▪
Jump height [cm]
▪
Ground contact time [ms]
▪
Reactive strength index (Jump height [cm]/ Ground contact time [s])
Test results
The test results are shown under the “Jumps” tab.
8.3.3.
Countermovement Jump (CMJ)
The Countermovement Jump is a vertical jump for testing concentric
strength in muscles used for jumping. This jump is performed from
a standing position with a downward countermovement. The coun-
termovement is a rapid downward movement to the start position
of the Squat Jump. T
he individual’s hands are kept on their hips
throughout the jump. This is to lessen the effect of the arms, which
could be used to boost height while jumping.
The exercise consists of jumping up as high as possible from an up-
right position, after making a countermovement when starting the
jump. The jump height is normally greater than the jump height of
the Squat Jump.
Measuring parameters:
▪
Jump height [cm]
Test results
The test results are shown under the “Jumps” tab.