Jump Mat Lab Assignment
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Apr 3, 2024
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1
Jump Mat Lab Assignment
Justin T. Bates
Department of Health Sciences, Liberty University
EXSC 351: Biomechanical Lab (004)
Professor Allison Schaefer
February 17, 2022
2
Data Collection Sheet
Jump Mat Lab
Subject Name:
Nick Blair
1 Jump Test: Hang Time (sec): 0.62 sec.
Jump Height (inches): 7.44 in.
4 Jump Test:
Ground Time (sec): 0.90 sec.
ELPF (Explosive leg power factor): 0.67
Average Jump Height (inches): 6.89 in.
Jump 60 Times Test:
Avg. ground contact time (sec) 0.58 sec.
EPI 0.87
Avg. vertical (inches) 4.18
in.
(Last 15 jumps)
Avg. ground contact time (sec) 0.56 sec.
EPI 0.92
Avg. vertical (inches) 5.35
in. (First 15 jumps)
Fatigue Factor: 0.89
3
Discussion Questions:
1. As the body jumps into the air, what three factors other than gravity and air resistance influence the trajectory of the body as described in EXSC 350?
Three other factors that could influence the trajectory of the body or an object in flight are the angle of the projection, the speed of the projection, and the relative height of the projection. 2. Find and write a mathematical formula that the jump mat computer would be able to use to calculate jump height based on hang time. Hint: Note that the jump mat does not measure velocity directly so be sure not
to use a formula that incorporates velocity (If you choose to find the formula online, please cite your reference).
Jump Height = (0.8747 x alternative jump height) – 0.0666
Reference:
McMahon, J. J., Jones, P. A., Comfort, P. (2016). A correction equation for jump height measured using the just jump system. International Journal of Sports Physiology and Performance
, 11
(4), 555-557. 3. What value is considered a “good performance” for the explosive leg power factor (ELPF) in the 4 jump test? What was your subject’s ELPF in
the 4 jump test? If it was not close to the recommended “good performance” score, what would you recommend that the subject do to in their weight training program to improve their explosive power?
A “good performance” value is a number higher than 2.5. My subject’s ELPF in the 4 jump test was 0.67. I would suggest that he add some explosive
jump power exercises such as high pulls with a barbell and weight, box jumps,
and hurdle hops. All of these should be able to improve his number when done correctly and more often over time.
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