Muscle part 2 - EMG 1 Neuromuscular Junction n n Connection...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: EMG 1 Neuromuscular Junction n n Connection b/w neuron and muscle Parts of the pathway n n n n Motor neuron Axon terminal Synaptic End Bulbs Synaptic Vesicles n n n n Contain Acetylcholine Acetylcholine Synaptic Cleft Motor End Plate Motor unit n Motor neuron + all muscle fibers it innervates 2 What is electromyography (EMG) n n n A technique used to monitor electrical activity of muscles The electrical activity monitored is due to a flow of charge causes by the movement of ions We can detect a change in charge of the muscle fibers by using electrodes 3 Effect of force on EMG readings n n Force is related to the number of active crossbridges The nervous system regulates force by controlling activation of motor units by: n n Motor unit recruitment Stimulation frequency 4 Muscle fatigue n Defined in 2 parts: A decline in muscle force n An increase in effort to maintain force n 5 EMG Readings n 2 graphs will be used to describe the EMG readings. Force vs. Time n Amplitude vs. Time n n Amplitude n Motor units active n Frequency n Rate of recruitment 6 3 Exercises 1. 2. 3. Ramp Contraction Isometric Maximal contraction Isometric Submaximal Contraction 7 Practical Info n n n n Monday 2:30 1.5 minutes per station Exercise 12: Skeletal Muscle Structure Exercise 14: Muscles from the handout only n Be able to identify muscle on a model or picture, Name the action of the muscle, and name antagonists/synergists of the action n EMG n Study tip: waynesburg muscle models link on d2l 8 ...
View Full Document

This note was uploaded on 09/11/2011 for the course PSIO 201 taught by Professor Stanescu during the Summer '08 term at University of Arizona- Tucson.

Ask a homework question - tutors are online