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EDKP 395 (37)
Lecture 2

Lecture 2 (revised).docx

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Kinesiology&Physical Education
EDKP 395
Russell T Hepple

10/18/2012 12:23:00 PM Persistence hunting Takes place during the hottest part of the day Run up on the animals, scare them away, then track them o Marathon pace not about getting there fast, just keep going Goal- run animals into exhaustion Introduction Metabolism- also includes absolute O2 consumption o Sum of all chemical reactions that occur in the body o Anabolic reactions Synthesis of molecules Ex. making muscle o Catabolic reaction Breakdown of molecules Ex. under dietary stress, breakdown of muscle for energy Bioenergetics o Converting food stuffs (protein, carbs, fats) into biologically usable form of energy (ATP) using chemical pathways in the cell Note: flight is the most energy fueled type of locomotion Parts of a cell Cell membrane o Sarcolemma- membrane in MUSCLE Semi-permeable (CO2, O2, protons) Phospholipid bi-layer Provides separation b/w internal & external environments Nucleus o Contains genes that regulate protein synthesis Molecular biology plays a HUGE role in exercise physiology o Skeletal muscle MANY NUCLEI Vs typical cell which only has 1 (exception= RBC) Cytoplasm o Fluid portion of cell\ o Separation b/w interior/extracellular fluid o Contains organelles Mitochondria Makes energy for cell Contains its own DNA Shows evidence that mitochondria ceom from eukaryotes Muscle adaptation When a muscle gets injured, there are other cells (Muscle Stem Cells or Satellite Cells) located outside the true muscle fibres that are recruited to repair myosites that are broken o Nuclei of stem cell travels to center of cell Myofilaments CONTRACTILE part of muscle cells have compartmentalization all the organelles are separate from each other and Exercise Science 10/18/2012 12:23:00 PM Molecular biology: study of molecular structures and events underlying biological process Relationships b/w genes and cellular characteristics they control Genes code for specific cellular proteins o Process of protein synthesis o Exercise training leads to modifications in protein synthesis Strength training results in increased synthesis of muscle contractile protein Provides tools for understanding cellular response to exercise o Application: helps us devise other ways of getting benefits from people who cant do exercise/certain types of exercise
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