IE_Lecture04-ed

IE_Lecture04-ed - 5 USCLE STRUCTURE MUSCLE STRUCTURE •...

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Lecture 4 Industrial Ergonomics (ENGR 3460U) Manual work Design usculoskeletal Musculoskeletal structor: Dr Ahmad arari Instructor: Dr. Ahmad Barari Barari- ENGR 3460U 1
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Principles of Design of Manual Work he use of human body The use of human body • The arrangement and conditions of the ork place work place • Design of the tools and equipments Barari- ENGR 3460U 2
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usculoskeletal System Musculoskeletal System he complex system of muscles and bones The complex system of muscles and bones which enables human body to produce ovements movements Barari- ENGR 3460U 3
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Ch. 4 – MUSCULOSKELETAL SYSTEM (and Work Design) gonists Agonists • Antagonists lexion Barari- ENGR 3460U 4 Flexion • Extension
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hree Types of Muscles Three Types of Muscles keletal Muscles levant to motion (of Skeletal Muscles relevant to motion (of which there are approximately 500 in the ody) body) • Cardiac – found in heart • Smooth muscles – internal organs and blood vessels Barari- ENGR 3460U
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Unformatted text preview: 5 USCLE STRUCTURE MUSCLE STRUCTURE • uscle and tendon Muscle and tendon • Bundle of fibers • onnective Tissue Connective Tissue • Blood vessels – enetrated in the bundles) penetrated in the bundles) • Muscle fiber (0.1 mm iameter, 5-140 mm d a ete , 5 length) Barari- ENGR 3460U 6 USCLE STRUCTURE MUSCLE STRUCTURE • Myofibril hick filament = myosin Thick filament myosin – Thin filament = actin • Molecular heads • Actin globules • liding filament theory Sliding filament theory bridges or bonds, break or reform Barari- ENGR 3460U 7 ORCE- ENGTH RELATIONSHIP FORCE LENGTH RELATIONSHIP 50% to 180% the sting length resting length Barari- ENGR 3460U 8 Achieve max muscle strength at midrange of motion • Where is midrange? • Force-length relationship • Relaxed posture • No muscle force • W e i ghtless astronaut in space! Barari- ENGR 3460U 9...
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This note was uploaded on 10/18/2010 for the course ENGR 3360 taught by Professor Ahmadbarari during the Fall '10 term at UOIT.

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IE_Lecture04-ed - 5 USCLE STRUCTURE MUSCLE STRUCTURE •...

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