EXS 125 - Spring 2017 Skeletal Muscle Anatomy & Physiology Presentation & Discussion.ppt

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EXS 125:Introduction to ExercisePhysiologySkeletal Muscle Anatomy and Physiology:Foundational Concepts & Select Applications
Skeletal Muscle Anatomy & PhysiologyDiscussion / Presentation OutlinePart I: Introduction & OverviewPart II: Muscle Anatomy (Macrostructure andMicrostructure)Part III: Muscle Physiology (Sliding FilamentTheory)
Skeletal Muscle Anatomy & PhysiologyDiscussion / Presentation OutlinePart IV: Anatomy / Physiology & Performance(Force – Velocity & Power – Velocity Relations)Part V: Program Design For Performance(Conjugate Periodization)
Skeletal Muscle Anatomy & PhysiologyDiscussion / Presentation OutlinePart VI: Proposed Biochemical Bases for MuscleFatigue (Inorganic Phosphate & Lactic Acid)Part VII: Evolving Research Directions in MuscleFunction & Sport Performance (Myosin HeavyChains)
Skeletal Muscle Anatomy & PhysiologyDiscussion / Presentation OutlinePart VIII: Re-examination of Dietary ProteinRequirements (For Resistance Training)
Skeletal Muscle Anatomy & PhysiologyPart I:Introduction and Overview
Introduction / OverviewIntroduction / OverviewSkeletal muscle produces power:Force developmentShortening velocityPower = force x velocity (P = F * v)The more force a muscle develops and the fasterit shortens, the more power it will generate
Introduction / OverviewIntroduction / OverviewMuscle force development andshortening are described by theslidingfilament theory of muscle contraction.Muscle structure will be discussedprior tothe sliding filament theory
Skeletal Muscle Anatomy & PhysiologyPart II: Muscle Anatomy (Macrostructure andMicrostructure)
Three Types of Connective Tissue:Epimysium, Perimysium, and Endomysium
Muscle StructureOverviewConnective tissues - Organize fibers in the muscleEndomysium- Covers each fiberPerimysium- Groups fibers into bundles calledfasciculiEpimysium- Encases all the fasciculiAll these connective tissues coalesce to form the tendons
Muscle StructureOverviewMuscles are comprised of individual musclecells (fibers)Cell membrane = sarcolemmaCell compartmentsCytoplasm (“cell water”)Mitochondria – (aerobic energy production)Sarcoplasmic reticulum – (compartment where Ca2+isstored)Multi-nucleated
Sectional View of a Muscle Fiber
The Motor UnitDefinition - A motorneuron and all themuscle fibersinnervated by thatneuronNeuron- Nerve CellMotor– referring toMuscle
The Motor Unit
The Motor UnitNerve supplyMotornerves (efferent) – nerves thatpropagate (transmit) action potentials(electrical signals)to skeletal muscleSensorynerves (afferent) – nerves thatpropagate (transmit) action potentialstothecentral nervous system
Muscle Anatomy (cont’d)Arrangement of the contractile proteinsMyofibrils - Threadlike strandscomprised of repeating sarcomeresSarcomere - The fundamental unit ofcontractionMyofilaments - The filamentous proteins actinand myosin located in the sarcomereThin filament = actinThick filament = myosin
Muscle Anatomy (cont’d)

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Term
Spring
Professor
Messer
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