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Enhancing Shoulder Muscle Strength with Free Body Diagrams and Moment Calculations

This case study focuses on shoulder muscle strengthening through systematic analysis using weights and free-body diagrams. It details the steps involved, from determining weights and points of interest to measuring critical distances and angles. The methodology includes calculating moments generated by various weights acting at specific angles, aiming to enhance understanding of shoulder mechanics. Additionally, a comparative in-class exercise on quadriceps strengthening demonstrates similar principles in action. This analytical approach aids in designing effective strength training programs.

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Enhancing Shoulder Muscle Strength with Free Body Diagrams and Moment Calculations

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  1. Case StudyShoulder Muscle Strengthening

  2. Case StudyShoulder Muscle Strengthening Weights: Barbell (300 N) Arm (50 N) Step I: Determine the weights and the points of interest

  3. Case StudyShoulder Muscle Strengthening B Distance measurements: a= b= b A a o Step 2:Measure the distance between the points of interest

  4. Case StudyShoulder Muscle Strengthening b a Step 3:Draw a free-body diagram

  5. Case StudyShoulder Muscle Strengthening d1 = a sin q d2 = b sin q M1= d1W1=aW1 sin q M2= d2(W2/2)=b(W2/2) sin q Mo = M1+ M2 Step 4: Determine the expressions for calculating moments.

  6. Step 5: Measure the angle for each position

  7. Case Study:Shoulder Muscle Strengthening M1= d1W1=aW1 sin q M2= d2(W2/2)=b(W2/2) sin q Mo = M1+ M2 Step 6: Substitute the values of a, b and q & solve the equations for moments

  8. Case Study IIAnother In-class ExerciseQuadriceps Muscle Strengthening Using leg images, calculate the net moment generated about the knee joint? Sample Information: Weight of Lower leg = 50N Dead weight @ ankle = 100N Link:http://tc.bme.rpi.edu/Statics/Exercise_Images/Quad Time limit = 15 minutes

  9. Case Study II (Solutions)

  10. Case Study II(Solutions) d1 = a cos q d2 = b cos q Mo = d1W1+ d2W2 = a cos qW1+ b cos q W2 = (a W1 + b W2) cos q

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