UMass Amherst KIN 460 - Lab 3 MU recruitment (3 pages)

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Lab 3 MU recruitment



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Lab 3 MU recruitment

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Pages:
3
School:
University of Massachusetts Amherst
Course:
Kin 460 - Motor Control

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Motor unit recruitment KIN 460 Motor Control Lab Section 1 Lab 3 Principles of Motor Unit Recruitment and Muscular Force Production Motor unit recruitment and force production with and without fatigue Introduction Over the last week in class you have learned about how electrical signals lead to the contraction of muscular tissue excitation contraction coupling cycle The cells responsible for sending the descending signals to the muscle fibers are known as motor neurons Motor neurons have different properties that influence how muscle is activated They can be classified as slow fast fatigue resistant and fast fatigable the size of the cells in each class get progressively larger Because each cell type has different force producing capabilities larger cells produce more force than the smaller ones larger cells are progressively recruited as they are needed see the left panel in the figure above Because there are multiple ways to perform a movement movement poses a problem for the nervous system Control of movement is primarily organized hierarchically movement goals are formulated by higher brain areas while the activation of specific muscle fibers is determined by neural processes in the spinal cord Purpose To study the recruitment of motor units for force production To understand the changes in force production over time under different degrees of effort To understand how these force changes are related to the properties of the motor neurons that innervate the musculature involved To understand what electromyography EMG is and what the signal being recorded represents BEFORE BEGINNING THE LAB BUT AFTER READING THE INSTRUCTIONS AND GAINING A BETTER UNDERSTANDING OF THE NATURE OF THE EXPERIMENT DEVELOP A HYPOTHESIS FOR THIS EXPERIMENT AND WRITE IT DOWN THIS WILL BE INCLUDED IN YOUR LAB REPORT Setup 1 Set up each workstation accordingly Make sure you have a Computer with Biopac MP3X unit b Hand dynamometer c EMG electrode lead set d Three disposable vinyl electrodes



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