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Biology 201 Dr. Edwin DeMont

Biology 201 Dr. Edwin DeMont. Humans: Walking and Running. St. Francis Xavier University. Terrestrial movement. A variety of energy saving mechanisms have evolved. Legged (2 or 4) terrestrial locomotion is metabolically expensive. (Why?).

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Biology 201 Dr. Edwin DeMont

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  1. Biology 201Dr. Edwin DeMont Humans:Walking and Running St. Francis Xavier University

  2. Terrestrial movement A variety of energy saving mechanisms have evolved. Legged (2 or 4) terrestrial locomotion is metabolically expensive. (Why?) Mechanisms are very different, depending on the gait of locomotion. Human walking and running gaits are very different, and thus save energy in different ways. St. Francis Xavier University

  3. Human Movement Demonstration of walking and running • My computerapps on ‘caesar’ (S:)BiomechanicsPrograms • HBMA5.2Press Run (Arrow under the Edit near top)Select Image Series Accept Settings Step > St. Francis Xavier University

  4. Walking Images from The Human Machine, McNeill Alexander. Filmed live Vertical (and horizontal) changes in center of mass. Contact leg is straight. Mechanical energy of the center of mass changes during cycle. St. Francis Xavier University

  5. Walking Filmed live Center of mass rotates around straight leg. St. Francis Xavier University

  6. Walking Center of mass and support leg look like an innervated pendulum. Mechanical energy changes in a pendulum similar to a human walking. St. Francis Xavier University

  7. Pendulum where m is the mass of the object (kg) and V is the velocity of the object (m/s). Energy of motion is called kinetic energy units are joules St. Francis Xavier University

  8. Pendulum Another type of energy we will examine is the energy of height (or position), and is called potential energy: P.E. = mgh units in Joules where m is the mass of the object (kg), g is the acceleration of gravity, and h is the ‘height’ (m) of the object. St. Francis Xavier University

  9. Pendulum Mechanical energy is conserved in a pendulum. Online Example St. Francis Xavier University

  10. Walking Total K.E. P.E. Energy 2 3 Time St. Francis Xavier University

  11. Running Filmed live Large vertical and horizontal oscillations Knees bent Aerial phase Mechanical energy of the center of mass changes during cycle. St. Francis Xavier University

  12. Running ? Energy d b Time St. Francis Xavier University

  13. Running External mechanical energy is transferred into internal ‘elastic’ energy. St. Francis Xavier University

  14. Running Similar to hopping on a pogo stick. St. Francis Xavier University

  15. Running ‘Springs’ are achilles tendon and ligaments in the bottom of the foot. St. Francis Xavier University

  16. Running Energytransfer Energy d b Time St. Francis Xavier University

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