Bio Mech Lap Report 5 PDF

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Summary

Lab assigned by teacher and answers found in the lecture videos provided...

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Jasmine Rodden APK 3220L – Biomechanical Basis of Movements Labatory April 9th, 2021 Lab 5 – Vertical Jumping

SQUAT JUMP TABLE 1 Variable Start of Jump

Time (s) 1.284 s

Push-Off Phase

0.302 s

Flight Time

0.806 s

Toe-Off Landing

1.588 s 2.090 s

Vertical Jump Height (m) Vertical Velocity at Toe-Off (m/s)

3.186 s 7.906 s

COUNTERMOVEMENT JUMP TABLE 2

Description Point at which force-time graph goes above 105% subject’s body weight Total time when force-time graph is above 105% subjects body weight to GRFv < 25 N Total time when GRFv < 25 N to the first instant after where GRFv > 25 N Time point where GRFv < 25 N Time point where GRFv > 25 N after Toe-Off p = Vit + 1/2agt2 p = Vit + 1/2agt2

Variable Start of Unweighing Phase

Time (s) 1.472 s

End of Unweighing Phase

1.782 s

Flight Time

0.63 s

Toe-Off Landing

2.232 s 2.862 s

Vertical Jump Height (m) Vertical Velocity at Toe-Off (m/s)

1.947 s 6.190 s

Description Point at which force-time graph goes below 95% subject’s body weight Time point when force-time graph returns to100% subjects body weight after start of unweighing phase Total time when GRFv < 25 N to the first instant after where GRFv > 25 N Time point where GRFv < 25 N Time point where GRFv > 25 N after Toe-Off p = Vit + 1/2agt2 p = Vit + 1/2agt2

DROP VERTICAL JUMP TABLE 3 Variable Initial Foot Contact

Time (s) 1.000 s

Ground Contact Time

0.246 s

Description Time when force-time graph goes >25 N for the very first time Total time when force-time graph

Flight Time

0.591 s

Toe-Off

1.247 s

Peak GRFv

1.096 s

Vertical Jump Height (m) Vertical Velocity at Toe-Off (m/s)

1.707 s 5.787 s

goes >25 N for the first time to when the graph goes 25 N Time point where GRFv < 25 N after initial foot contact Max GRFv value during the ground contact phase p = Vit + 1/2agt2 p = Vit + 1/2agt2

#2 Using the data from tables 1-3, write one to two paragraphs explaining the differences between: 1) vertical jump height between SJ, CMJ, and DVJ, and 2) one to two paragraphs explaining the differences between vertical velocity at toe-off forth SJ, CMJ, and DVJ. Be sure to use concepts from biomechanics to explain your answer. The use of peer-reviewed scientific journal articles is also encouraging to help support your answer.

Of all three jumps, the squat jump had the greatest flight time. This reason may have been because the vertical jump height was also the largest. The reason for squat jump having the greatest vertical jump height can be accredited to the fact that it would provide the body with a lot more strength than the other two jumps. The vertical jump test provides a measure of lower extremity power, which seems to be the reason why having that ability to squat down and get the maximum power available resulted in the best performance. The vertical velocity at toe-off was also greater in the squat jump than both the countermovement jump and drop vertical jump. This can be due to the fact that vertical height is the highest with this jump and that jump height, as well as, flight time is so significant in the vertical velocity toe-off....