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Strengthening Shoulder Muscles: A Comprehensive Case Study on Weight Mechanics

This case study explores the mechanics of shoulder muscle strengthening using weights, specifically barbell and arm weights. It systematically details the steps to determine weights, distance measurements, and the creation of a free-body diagram. Key calculations include determining moments and angles for effective muscle engagement. We demonstrate two case studies: one focusing on the shoulder and the other on quadriceps muscle strengthening, incorporating the net moment calculation at the knee joint. Emphasizing the importance of precise measurements, this study serves as a practical guide for anatomical strength training.

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Strengthening Shoulder Muscles: A Comprehensive Case Study on Weight Mechanics

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Presentation Transcript

  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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