Bosco Squat Jump +

This procedure describes the method used for measuring leg power using a variation of the Squat Jump, in which an extra weight load is added to the shoulders. This is part of the Bosco Ergo Jump System. See more about other vertical jump techniques.

equipment required: Bosco Ergojump System (or similar device - e.g. just jump mat, Myotest, infrared laser system), weightlifting bar, gym weights of various sizes.

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.

procedure: Jump height is calculated using a timing mat which measures the time the feet are off the mat. The appropriate amount of weight is placed on the shoulders. The athlete stands in socks or bare feet, as still as possible on the mat with weight evenly distributed over both feet. The athlete squats down until the knees are bent to 90 degrees. When all is ready, the athlete jumps vertically as high as possible, and back on the mat with both feet landing at the same time. Allow a good rest between trials. The take-off must be from both feet, with no initial steps or shuffling. The best of at least three attempts is recorded - athletes may continue to jump as long as improvements are being made. The best effort is recorded.

scoring: The timing mat may give a score of the time in the air, and the calculated vertical jump height can be calculated. Height can be calculated using this formula: jump height = 4.9 x (0.5 x Time)^2 ).

disadvantages: The jump height is affected by how much you bend your knees, so the test can be invalidated if the subject does not bend the knees the required 90 degrees each time.

comments: The subject may benefit from practice, and should be verbally encouraged to perform maximally for each attempt.

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