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ENVIRONMENTAL EXERCISE PHYSIOLOGY

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Title: ENVIRONMENTAL EXERCISE PHYSIOLOGY


1
ENVIRONMENTALEXERCISE PHYSIOLOGY
2
ENVIRONMENT
  • The sum total of all the conditions and
    elements which make up the surroundings and
    influence the development of an individual. This
    course primarily focuses on the thermal
    environment, influences of barometric pressure
    (hypobaria and hyperbaria), quality of air, and
    microgravity.

3
ECOLOGY
  • Branch of biology that deals with the relations
    between living organisms and their environment.
    An organism is the center of an ecosystem and is
    influenced by a multitude of living things and
    yet capable of resisting to some extent the
    impact of the environment.

4
CONFORMING VERSUS REGULATING ORGANISMS
  • The internal conditions of conforming organisms
    are more closely related to the conditions of the
    surrounding environment whereas the regulating
    organisms are capable of maintaining a relatively
    constant internal environment (homeostasis)
    despite widely fluctuating environmental
    conditions

5
REGULATING ORGANISMS
  • Humans are an excellent example of regulating
    organisms and because of this ability, the human
    is referred to as a homeotherm or warm-blooded
    organism and consequently can survive in diverse
    environments (ecosystems).

6
CONFORMING ORGANISMS
  • Poikilotherm is a cold blooded animal and
    although they tend to have a wider range of
    internal variation, they tend to have a narrower
    environmental survival range than a homeotherm
    because of a lesser ability to regulate their
    internal environment.

7
CONFORMING VERSUS REGULATING ORGANISMS
8
Early Example of Humans as an Regulating Organism
  • In the 1700s the Secretary of the Royal Society
    of London, Mr. Blagden along with his dog, an
    egg, and a steak entered a room heated to 105
    degrees C (221 degrees F) which was above the
    boiling point for water.
  • Fifteen minutes later the egg was baked hard and
    the steak was burnt crisp Mr. Blagden and his
    dog walked out unharmed (dog was carried in a
    basket so his feet did not get burned).

9
THERMAL ENVIRONMENT
  • A biophysical aggregate of air temperature, wind
    speed, relative humidity, and radiation.

10
TEMPERATURE
  • The degree of sensible heat or cold a measure of
    the escaping tendency of heat from a system
    (temperature flows or moves from hot areas to
    cold areas) the property of a system that
    determines whether or not the system is in
    thermal equilibrium with other systems.

11
LAWS OF THERMODYNAMICS
  • Zeroth Law - two systems in thermoequilibrium
    with a third system are in thermoequilibrium with
    each other.

12
LAWS OF THERMODYNAMICS
  • First Law - energy is conserved in any process
    the energy gained (or lost) by a system is
    exactly equal to the energy gained (or lost) by
    the surroundings.
  • Heat Balance Equation is derived from the First
    Law of Thermodynamics.

13
Heat Balance Equation S M - ( Wk) - E R
C K
  • S Heat Storage
  • M Metabolism
  • Wk Work where is positive work representing
    energy leaving the system and - is negative or
    eccentric work
  • E Evaporation insensible exchange of heat via
    vaporizing moisture
  • R Radiation sensible exchange of heat via
    electromagnetic waves
  • C Convection sensible exchange of heat via a
    circulating medium
  • K Conduction sensible exchange of heat via a
    static medium

14
LAWS OF THERMODYNAMICS
  • Second Law - there is always an increase in
    entropy in any naturally occurring (spontaneous)
    process. Entropy refers to increasing disorder
    or diminished capacity for spontaneous change, as
    occurs in aging.

15
LAWS OF THERMODYNAMICS
  • Third Law - absolute zero is unattainable to
    approach absolute zero (i.e., the temperature
    where molecular motion stops) takes increasing
    amounts of energy. Absolute zero is equal to 0o
    Kelvin, - 273o Celsius, or - 460o Fahrenheit.

16
QUESTIONS?
17
THANK YOU!
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