Force-Length Relationship & Force-Velocity Relationship

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Presentation transcript:

Force-Length Relationship & Force-Velocity Relationship 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? Isolated Muscle *Linear Force (in N or lbs) Human Body *Angular Force (Torque; N*m or ft*lbs)

Terminologies Isometric Contraction Isotonic Contraction “same length” Isotonic Contraction “same tension” Isokinetic Contraction “same speed”

Force-Velocity Relationship

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

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)