HLSC 3P90 Study Guide - Midterm Guide: Baroreflex, Skin Fold, Abdominal Obesity
6 Dec 2013
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Exercise is an acute bout of exertion requires energy above resting level, is planned to improve fitness. Resistance exercise -- exertion of force against a load. Aerobic exercises -- use oxygen to meet the energy demands during exercise. Vo2 max = maximum capacity of body to transport oxygen during exercise, reflects physical fitness of ppl. 5x greater during exercise -- ~25 l/min during maximal exercise: depends on exercise intensity & oxygen demand. Vascular resistance: tpr decreases during aerobic exercise vasodilation of active muscle, sympatholysis, exercise blunts sympathetically mediated vasoconstriction in active muscle beds, vasoconstriction maintains perfusion pressure, q has an upper limit results in vasoconstriction to active muscle. Arterial compliance: compliance increased 30 min after exercise, pulse wave velocity decreased up to 1h post, due to: vasodilation and reduced tpr, decrease sns & circulating hormones. Valsalva maneuver: forcefully exhaling against a closed glottis lungs remain inflated, protective effect on cerebral arteries and cardiac load.
