SUNY Cortland EXS 587 - Electromyography (13 pages)

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Electromyography



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Electromyography

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Lecture Notes


Pages:
13
School:
State University of New York College at Cortland
Course:
Exs 587 - Advanced Biomechanics

Unformatted text preview:

Electromyography Chapter 8 EXS 587 Dr Moran http www delsys com images library teresa jpg Outline Review of Muscle Contraction Physiology Physiological Basis and Concepts of EMG Alwin Luttmann Methods of EMG Collection Electromyograhy in Ergonomics Shrawan Kumar Limitations Uses Journal of Electromyography and Kinesiology full text in ScienceDirect 1 Physiological Basis Muscle contraction due to a change in the relative sliding of thread like molecules or filaments Actin and Myosin Filament sliding triggered by electrical phenomenon The recording of muscle APs is called electromyography What can be learned from an EMG Time course of muscle contraction Coordination of several muscles in a movement sequence Field of Ergonomics from the EMG conclusions about and the can be derived as well 2 Excitable Membranes Cell membrane separates intracellular from extracellular space Cell Membrane Structure Double layer of phospholipids both surfaces covered in proteins Hydrophobic Tail Role of Proteins Transport Receptor Transfer information http www longevity ca images cell membrane3 gif Fluid Distribution Concentration of ions different inside vs outside of cell membrane This results in an electrical potential difference known as a Typical magnitude of membrane potential is 60 and 90 mV interior of cell is negatively charged This potential can change within to 20 to 50 mV This rapid change is called an 3 Ion Concentration Intracellular Fluid High concentration of Potassium cations K and Protein anions A Extracellular Space High concentrations of Sodium cations Na and chloride anions Cl Ions Intracellular mmol l Extracellular mmol l Ratio Inside outside Na 12 145 1 12 K 155 4 40 1 Cl 4 120 1 30 A 155 Uneven distribution the work of active transport that pushes Na from inside to outside and K from outside to inside ION PUMP requires ATP FCON FEL INSIDE High K OUTSIDE CELL Low K MEMBRANE permeable to K 4 Nernst Equation Used to determine resting membrane potential RT Vm z F ln ci



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