# UMass Amherst KIN 430 - Biomechanics Lab D (3 pages)

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# Biomechanics Lab D

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## Biomechanics Lab D

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Pages:
3
School:
University of Massachusetts Amherst
Course:
Kin 430 - Biomechanics
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Emily Weimer Biomechanics Laboratory D Angular Kinematics Max Angular Position deg Min Angular Position deg Angular Displacement deg Average Angular Position deg Average Angular Velocity deg sec Maximum Angular Velocity deg sec Average Angular Acceleration deg sec 2 Maximum Angular Acceleratio n deg sec 2 121 82 76 208 109667 99 78587801 19 1871347 5 90 6366 6 0 70092198 6 653 68333 120 36 76 904 677 98 7587957 0 30713978 166 809 3 26 2849462 1691 8966 40 RPM 80 RPM Angular Position deg Angular Posit ion v Time 125 115 105 40 position 80 position 95 85 75 0 0 5 1 1 5 2 2 5 3 3 5 4 4 5 5 Time s Angular Velocit y v Time Velocity 100 0 40 RPM velocity 80 RPM 100 200 0 1 2 3 4 5 Time s Angular Accelerat ion v Time 1500 Acceleration 1000 500 40 RPM accel 80 RPM 0 500 1000 1500 0 0 5 1 1 5 2 2 5 3 3 5 4 4 5 5 Time s Discussion In the above figures both the 40 RPM and 80 RPM pedaling speeds have a similar sinusoidal curve for their angular kinematics at the knee joint The main difference between the different pedaling speeds is the frequency with the 80 RPM frequency being higher meaning that more complete pedal cycles happen during the 5 second periods which in the graph can be seen as having more peaks Overall both the 40 RPM and 80 RPM pedaling speeds followed similar trends but the 80 RPM speed happened more frequently and had higher and lower positive and negative values The values for the 80 RPM speed had a much bigger range from peak to minimal position whereas the 40 RPM speed tended to be closer to zero with a smaller range between peak and minimal position The angular position vs time graph is the only graph that doesn t have negative values as the position being measured was the knee while pedaling which was continuously moving in the positive direction both velocity and acceleration vs time graphs have both positive and negative values In the angular position vs time graph the 40 RPM and 80 RPM maximum minimum and average values were very close For example

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