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8.12 Repetitive Jump Test (Repetitive Jump)
Test description
Repetitive Jump Test
consists of jumps made in serial for a pre-
determined duration, which is determined by time or number
of jumps. The results are used to calculate mechanical power.
Test parameters
Repetitive Jump Test
has three parameters:
•
Test Duration
determines the amount of seconds the subject
keeps jumping in one test action
•
Jump Count
determines the amount of jumps performed in
one test action
•
Test Type
is a selection between
Test Duration
and
Jump
Count
. If the
Test Duration
is selected, the test action lasts for
the number of seconds defined by the
Test Duration
parame-
ter. Otherwise a test action lasts for the number of jumps de-
termined by the
Jump Count
parameter.
Test sequence
The subject starts jumping and keeps on jumping until the time
has elapsed or the number of jumps has been performed.
Measurement Unit
beeps when the test is finished.
If the test is cancelled, it cannot be continued, since Powertim-
er needs to measure the time offset from the first jump for each
jump.
Test results
Powertimer measures the jump and contact times and calcu-
lates the following results:
•
Jump Height
for each jump in centimeters or inches depend-
ing on the regional settings.
•
Jump Offset
is the time from the beginning of the first jump to
the end of the current jump in seconds.
•
Jump Power
for each jump except the first one, since the first
does not have an associated contact time.
•
Minimum Power
is the power of the worst jump in the test.
•
Average Power
of the jumps in the test action.
•
Relative Power
• Powers for each of the 15-second period of jumps
•
Power Decline
is the difference between average of the
three first jumps and the average of the three last jumps
•
Fatigue Index
is the relation between the average of the
three first jumps and the average of the three last jumps
•
Speed-Strength Endurance Capacity
is the average of the
first 15 seconds compared with the best
Counter Movement
Jump
result within the same test session.
8.13 Take-off Reaction Test (TRT)
Test description
The
Take-off Reaction Test
measures the subject’s ability to re-
act to a given signal, take-off and accelerate. The subject
has six trials in random order for both directions. The sub-
ject stands in front of the
Powertimer Measurement Unit
on the
jump mat in ready position. Photocells are placed on each
side of the mat 5 meters away. When the
Powertimer Meas-
urement Unit
gives a direction signal,
the subject reacts and
accelerates through the photocell.
Test parameters
TRT does not have any parameters.
Test sequence
The subject steps on the jump mat and the
Performing Test
no-
tification is shown on the screen of
Powertimer SW-300
. After
5-10 seconds either of the lamps is lit and the subject needs to
sprint to the photocell at that direction. The reaction and sprint
times are measured. After the subject has done six trials into
both directions the test is considered complete.
Test results
Powertimer measures the reaction and sprint times and adds
them together to obtain the total time. The first page of results
shows the times for the sprints to the left and the second page
shows the right results. The third page shows the difference
between the left and right results. The side, which has the bet-
ter result, is shown in parenthesis in the
Diff %
field of the third
page.
TE
ST
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