EHS 230 Lecture Notes - Lecture 21: Myocyte, Neural Coding, Hockey Puck
25 Jul 2018
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Lecture 21
Force to velocity relationship
- Force velocity curves show how concentric and eccentric contractions affect the
force produced
- The most force produced is based off on eccentric exercises
- Muscle length- resting muscle can generate more force because actin and
myosin are at good position to contract
when a muscle’s velocity of concentric contraction rises the possible force that it
generates decreases
Ex. Hitting an air hockey puck
- If eccentric contraction velocity rises, the force that the muscle may produce
increases too
- Force and velocity are proportional
Ex. Kicking a soccer ball or throwing a football
- In concentric and eccentric activation
-muscle’s contraction rate depends on its max production of force
Biomechanical factors in human strength
Neural control
- Recruitment- motor units in contraction
- Rate coding- rate motor units are going at
- Neural adaptations – responsible for muscle increase in 1st weeks of lifting
-slows down afterwards
Muscle fiber arrangement
- Pennation angle- angle in between muscle fiber and line b/w origin and insertion
- Pinnate muscle- soft looking construction of fibers
-increases muscle force production and contraction at high speed
- not good for eccentric, isometric or contraction at small speed
Human strength and power
- Strength- able to apply force and do work
- Work- result of force on object + distance object travels
-W= F(D)
- Velocity- change in item’s position over period of time
-D/T
Document Summary
Force velocity curves show how concentric and eccentric contractions affect the force produced. The most force produced is based off on eccentric exercises. Muscle length- resting muscle can generate more force because actin and myosin are at good position to contract when a muscle"s velocity of concentric contraction rises the possible force that it generates decreases. If eccentric contraction velocity rises, the force that the muscle may produce increases too. Kicking a soccer ball or throwing a football. Muscle"s contraction rate depends on its max production of force. Rate coding- rate motor units are going at. Neural adaptations responsible for muscle increase in 1st weeks of lifting. Increases muscle force production and contraction at high speed. Not good for eccentric, isometric or contraction at small speed. Pennation angle- angle in between muscle fiber and line b/w origin and insertion. Pinnate muscle- soft looking construction of fibers. Strength- able to apply force and do work.
