EDKP 330 Lecture Notes - Lecture 6: Adenosine Triphosphate, Cardiovascular Disease, Circulatory System

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9/27/2012 3:12:00 PM
Leading cause of death
Heart disease
How much PA is needed to reduced risk of CHD? aerobic exercise
Moderate activity 30min/day 5-7 days a week
Vigorous acitivity 30min/day 3-5 days a week
Dose-response relationship
~420min/week we see ~4-% reduction in risk of premature death
Aerobic exercise is the single most important component of health-related
physical fitness
ESP FOR PREVENTING CHD
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Hypokinetic disease
o Chronic conditions associated with lack of PA
Definitions:
Cardiorespiratory: pertaining to cardiac (heart) and respiratory
(lungs) systems
AEROBIC- produces energy during PA USING O2!
Anaerobic- producing energy during PA WITHOUT O2
o Short term bursts of energy hockey players, football players
o Two systems
ATP PC: high amounts of energy quickly (sprinters)
Lactic acid system: high intensity, short duration
(hockey players)
Adenosine triphosphate (ATP)- chemical compound that is the
immediate source of energy for PA
Oxygen consumption
As blood leaves the heart and passes through arteries, it is HIGH in
O2.
As it returns to the heart via veins, it is LOWER in O2
o O2 has been extracted at the tissues who require O2
Note: an athletes heart may appear larger (and therefore stronger) then an
untrained individual
Walls/septum and ventricular walls tend to be thicker allowing them
to pump more blood with each contraction
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left side: systemic circulation
during rest, blood circulation is more focused on organs (liver,
brain), digestive system, urine production than it is on the
extremities
once exercise starts blood is more focused on your muscles, and
less so on digestion and urine production
o ~90% to muscles
Capillaries: site of gas exchange
More trained individuals may have a higher count of capillaries then
an average untrained indv.
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