UMass Amherst KIN 430 - Lab 6 Handout_adjusted (6 pages)

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Lab 6 Handout_adjusted



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Lab 6 Handout_adjusted

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Pages:
6
School:
University of Massachusetts Amherst
Course:
Kin 430 - Biomechanics

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LABORATORY 6 MUSCLE STRENGTH ENDURANCE FATIGUE IMPORTANT TERMS 1 2 3 4 5 6 7 Muscle strength Muscle fatigue Muscle endurance Excitation Contraction Coupling EMG Recruitment Rate coding IMPORTANT CONCEPTS 1 2 3 4 Factors determining muscle strength Muscle fatigue induced by repetitive isometric contractions Units of measurement for muscle strength Size principle INTRODUCTION Muscle strength is the ability generate force This is dependent on the cross sectional area of the muscle Thus a larger muscle will be able to produce more force The larger the muscle the more sarcomeres exist in parallel Each group of sarcomeres in series generate some amount of force so the more sarcomeres in parallel the more force can be generated Muscular endurance is the ability of a muscle or group of muscles to sustain repeated contractions against a resistance or sustain a force for an extended period of time Muscular endurance is quite different than muscular strength as endurance measures how long a person can maintain a submaximal force while strength measures how much force a person can produce One major physiological difference between endurance and strength is fiber type Type I fibers are more fatigue resistant than type II fibers because they contain greater amounts of myoglobin mitochondria and blood capillaries In this lab we will examine fatigue during a muscle endurance test using force and EMG measurements Muscle fatigue is defined as a decline in maximal force production and affects the ability to do work Muscle fatigue can occur in response to short term high intensity exercise or prolonged submaximal exercise The mechanisms underlying muscle fatigue are multifactorial and may be dependent on the type of exercise and the mode of contraction performed Muscle fatigue can occur as a result of alterations in any step along the force producing pathway The central nervous system may play a role in muscle fatigue by altering the neural drive from the motor cortex to the muscle



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