Jump Mat Lab Assignment
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Jump Mat Lab Assignment
Justin T. Bates
Department of Health Sciences, Liberty University
EXSC 351: Biomechanical Lab (004)
Professor Allison Schaefer
February 17, 2022
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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
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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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4. In regards to the fatigue factor in the 60 jump test, what value indicates no fatigue? What was your subject’s fatigue factor in the jump 60 test? If it was not close to the “no fatigue” value, what would you recommend that the subject do to in their weight training program to improve their muscle endurance?
The average ground contact time was very similar, not indicating fatigue. His fatigue factor was a 0.89, so not too far from the no fatigue value of 1, but I would tell him to do more squats and heavier weights with that, and to include exercises like jumping rope, and even pushups. They are not glamorous workouts, but they can all help improve muscular endurance. 5. How could a jump mat be helpful for personal trainers or strength coaches? Provide at least three specific examples. (Please write your answer in a minimum of 100 words total). (Include word count at end of your response).
1.
Personal trainers or strength coaches can tell of basic things about the patient or student, such as vertical jump, foot quickness, and reaction time.
2.
It quickly shows the results. The subject doesn’t have to sit and wait around to figure out how they performed. Time is important, and it helps when you can figure out results in a short manner of time.
3.
This mat measures jumping and plyometric abilities, so if a personal trainer is working with an athlete such as basketball or football player, they can get their result and inform them of what they need to do better to improve their results, or acknowledge that their results are good and that their a top-tier athlete. 6. In 100 words or more, discuss a research article from a scientific journal that incorporates the use of a jump mat (sometimes called a
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switch mat) for data collection. (Be sure not to confuse a jump mat with a pressure mat or force plate as these devices are different). Provide an overview of the study’s purpose, methods, and results. Include word count at end of your response. Be sure to also include a full reference (in APA format) and link to this study after your discussion of this article.
I read an article that used two different jump mat tests for their experiment. The purpose was to compare, “the error of measurement of two jump-mat systems (Chronojump-Boscosystem
and Globus Ergo Tester) with that of a motion-caption system as a criterion” (Peuo, et al, 2016, para. 2). They also wanted to determine the modifying effect of foot length on jump height. For their method, they got thirty-one young adult males to alternate four countermovement jumps with four squat jumps. The results showed that the jump-mat systems produced nearly identical measures of jump height. “Countermovement and squat-jump height were both 13.6 cm higher with motion capture, but this very large difference was reduced to small unclear differences when adjusted to a foot length of zero” (Peuo, et al, 2016). Therefore, foot length can indeed explain the substantially higher jump height observed with motion capture. In conclusion, the jump-mat systems provide trustworthy measurements for monitoring changes in jump height. Works Cited
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Pueo, B., Lipinska, L., Jimenez-Olmedo, J.M., Zmijewski, P., Hopkins, W.G. (2017). Accuracy of jump-mat systems for measuring jump height. International Journal of Sports Physiology and Performance,
12(7): 959-963. https://www.researchgate.net/publications/
311643412_Accuracy_of_Jump-Mat_Systems_for_Measuring_Jump_Height
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