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Drop Jump Test

The drop jump, also called the depth jump or box jump, is a fitness test of leg strength and power which requires the athlete to "drop off" a box and immediately jump as high as they can. There is also an Incremental Drop Jump test used for measuring reactive leg strength, where the athlete jumps after dropping from a series of different heights. There is also a drop jump assessment as part of the Bosco Ergo Jump System. See about other vertical jump tests.

purpose: to measure the explosive force of the lower limbs

equipment required: vertical jump measurement mat (e.g. just jump mat, Myotest, infrared laser system), boxes of various heights.

pre-test: Explain the test procedures to the subject. Perform screening of health risks and obtain informed consent. Prepare forms and record basic information such as age, height, body weight, gender, test conditions. Check and calibrate timing mat measurement. Subject to perform an appropriate warm-up. See more details of pre-test procedures.

drop jump test

procedure: This test is performed from a pre-set box height. The heights used can be between 20 cm and 100 cm. The athlete stands on the box, adjacent to the timing mat. Hands are placed on the hips, and stay there throughout the test. The athlete then drops down off the box onto the mat, bending the knees on landing, then immediately performs a maximal vertical jump. The athlete jumps vertically as high as possible, and lands back on the mat with both feet landing at the same time, returning to the takeoff spot. Several trials can be performed, with adequate rest between trials.

scoring: Depending on the equipment, there may be measurements of contact time, flight time, height of the jump, power of the jump, and ground reaction forces. The jump height time is the time between the participant's feet leaving the timing mat or force platform and when they contacted it again. Vertical jump height can be calculated using this formula: jump height = 4.9 x (0.5 x Time)2. Ground contact time is the time between the first foot contact with the force platform and when the participant's feet left the mat. Reactive strength index (RSI) can be calculated by dividing the jump height by the ground contact time.



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