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Lecture 6

Lecture 6 (revised).docx

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McGill University
Kinesiology&Physical Education
EDKP 330
David J Pearsall

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  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 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. Amount O2 in arterial vs venous blood allows us to see how much O2 is consumed  VO2max = A-Vo2 difference o i.e. [O2] in arteries – [O2] in veins o venous blood has less O2, and more CO2 Basic physiology  Air taken up into lungs, O2 diffuses into blood  Blood pumped to heart then to the rest of the body (organs, tissues) o O2 is bound to hemoglobin in RBC  At cells, O2 is converted to food to provide energy for PA in the form of ATP Cardiorespiratory endurance  Measure of how pulmonary (lungs) and vascular (heart) and muscular systems work together Oxygen uptake (VO2)  Capacity to deliver and use O2  Used to evaluate cardiovascular health Measures of energy expenditure  Amount of energy it takes for a person to by Phsically acite, to breathe, to circulate blood, and to digest food o Total energy expenditure (TEE)  Sum of all components o Physcially active energy expenditure  Specifically the result of PA o Thermic effect of food 9/27/2012 3:12:00 PM Benefits  Higher Max O2 uptake o Allows for longer exercise  Increase O2 carrying capacity of blood o Inc. RBC  Dec. resting heart rate o Increase hear
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