UMass Amherst KIN 470 - kin 470 lab report 6 (7 pages)

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kin 470 lab report 6



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kin 470 lab report 6

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Pages:
7
School:
University of Massachusetts Amherst
Course:
Kin 470 - Exercise Physiology

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Victoria Newbury Lab Tuesday 1 00 Due Date 4 18 14 KIN 470 Exercise Physiology Grad TA Ben Hoffman Lab Report 6 Muscle strength endurance fatigue INTRODUCTION The important vocabulary terms for the purposes of this lab are as follows Muscle strength can be defined as the ability of the body to produce force against resistance Muscle endurance which can often be paired with muscle strength in terms of ability is the ability for the muscle to resist fatigue and perform muscular contractions against resistance for multiple sets Muscle fatigue is the point of time at which the muscle in inability to perform any successive contractions without first resting Excitation contraction coupling is when an electrical signal is converted into a mechanical action by the body The message to contract originates in the brain and is sent to the muscle via the CNS and PNS The electrical signal becomes chemical in the motor neurons which create a mechanical contraction The force of the contraction is dependent upon the message that was sent to the muscles EMG electromyography is a measurement of the electrical activity occurring in a muscle It is often used for the heart in order to track heart beat via depolarization and polarization Greater amplitude signifies a greater amount of electrical activity in the muscle via alpha motor neuron Recruitment is a measure of how many motor neurons are activated in a muscle Motor neurons innervate the muscle fibers in a muscle Certain muscles have a high innervations ratio to produce more precise movements such as the eye Muscles with low innervations ratios are much more adept for producing force such as the bicep A greater force will be produced in muscle with high recruitment Rate coding is the frequency of motor unit activation This is the speed at which your body can react to a message sent from the brain to contract Force production is dependent on this variable because a greater rate coding produces more force The purpose of this



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