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Muscular Strength

Muscular Strength. Force-Length Relationship & Force-Velocity Relationship. How Could You Increase Force?. ↑ # of Cross-Bridge (i.e. Actin-Myosin) ↑ Force Production. Force-Length Relationship. Too Short !. Too Long !. How do we measure Muscular Force?. Human Body *Angular Force

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Muscular Strength

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  1. Muscular Strength Force-Length Relationship & Force-Velocity Relationship

  2. How Could You Increase Force? ↑ # of Cross-Bridge (i.e. Actin-Myosin) ↑ Force Production

  3. Force-Length Relationship Too Short ! Too Long !

  4. How do we measure Muscular Force? Human Body *Angular Force (Torque; N*m or ft*lbs) Isolated Muscle *Linear Force (in N or lbs)

  5. Terminologies • Isometric Contraction “same length” • Isotonic Contraction “same tension” • Isokinetic Contraction “same speed”

  6. Force-Velocity Relationship

  7. Fatigue and Fiber Type • As a muscle contracts maximally many times the ability to generate force will decrease • The degree to which force decreases can be measured by percent torque decline or fatigue index • A rough estimation of fiber type can be made based on the decline in force production

  8. Lab Procedure • Torque vs Angle (3 subjects) Isometric Contraction @ 90˚ , 130 ˚, 170 ˚ • Torque vs Velocity (3 subjects) Isokinetic Contraction @ 60 ˚/sec, 180 ˚/sec, & 300 ˚/sec • 50 Repetition Fatigue (1 subject) 50 reps isokinetic contractions (180˚/sec)

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