When we increased the weight in the biceps curl or increased the clench force, the size...
When we increased the weight in the biceps curl or increased the clench force, the size of the EMG changed. Why does this occur? What does the size of the EMG represent?
Homework Answers
Ans) The EMG amplitude will increase with increasing load, up to the muscle's maximum. EMG amplitude increases because there are more muscle fibers firing action potentials simultaneously, and each fiber contributes some force, in order to generate a total force equal to the load.
- EMG amplitude is the sum of the electric potential differences within a muscle relating to all of the active motor units in the vicinity of the electrodes on the skin. EMG amplitude can therefore be taken as a global measure of motor unit activity during the muscle action being performed.
- During movements, the force-length-velocity relationship and the elastic properties of muscle should be taken into account. Also, EMGs during concentric movements are larger than those measured during isometric actions.
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so we can often neglect gravity in electricity and magnetism. How
far does the electron of a hydrogen atom have to be removed from
the nucleus (contains only one proton) for the force of attraction
equal the weight of the electron at the surface of the Earth (g=9.8
m/s2)? Is that large compared to the size of an atom?
2. The electric force is much stronger than the gravitational force...
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perpendicular to the surface; we call this the normal force,
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