3120%20Cardio%209%20Jan%202012%20for%20WebCT

Inc blood dec blood cv regulation during exercise 3

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Unformatted text preview: hown). [!tæk"#k$rd"%] swift ! tachycardia (# HR) ! # cardiac contractility ! # CO ! # MAP ! constriction of the resistance vessels in the kidney and splanchnic bed (intestines), and of the splanchnic capacitance vessels. inc blood dec blood CV regulation during exercise 3.  Nervous System: What activates SNS? # sympathetic outflow is due in part to a "central 1. command" from the cerebral cortex and to activation of receptors in the contracting skeletal muscles. 2. CV regulation during exercise 3.  Nervous System: As exercise continues and the body temperature begins to rise, the temperature-sensitive cells in the hypothalamus are activated; constrict skin, we don't want to constrict ! inhibit the sympathetic outflow to the skin vessels and stimulate the cholinergic fibers to the sweat glands. ! This results in dilation of the skin vessels. $ HR may increase as a result cardiovascular drift Increased body Temperature during exercise Body temp increases $ Blood vessels in skin dilate $ Blood diverted away from muscle to skin to dissipate heat $ Less blood going to muscle ! less muscle pump $ "  venous return to the heart $ increase End diastolic volume, increase stroke volume "  EDV ! " SV (Frank-Starling) $ In order to maintain CO during exercise, HR must increase to compensate for decreased SV CV regulation during exercise 4.  Humoral: If exercise is severe, the cholinergic fibers to the adrenal medulla are activated and epinephrine is released into the bloodstream. ! enhances the heart rate and contractility as well as the constriction of the veins and the renal resistance vessels CV regulation during exercise Benefits of regular exercise Heart: •  Decreased risk of heart disease •  Increased blood supply to the heart (more capillaries supplying blood to the working heart muscle) ! better oxygen delivery •  Larger heart volumes, lower heart rates at rest Blood and blood vessels: •  Fast-flowing blood has an anti-inflammatory effect as powerful as that of some steroids that protect arteries •  Lowers blood pressure •  Increases HDL levels (good cholesterol) and lowers LDL levels (bad cholesterol) – not seen in weight training •  Blood vessels are more compliant (stretchable) Benefits of regular exercise CNS: •  Decreased risk of stroke •  Slows down age-related shrinkage of the brain •  Stimulates neurogenesis Benefits of regular exercise Psychological Aspects: •  •  •  •  •  •  •  Increases feeling of well being and self-esteem Better sleep patterns Exercise reduces mild to moderate depression Reduces anxiety Reduces stress Improves mood Reduces chronic fatigue syndrome. Benefits of regular exercise Other: •  Reduces risk of osteoporosis •  Reduced body fat (abdominal fat), which decreases the risk of heart disease. •  Increased insulin sensitivity (less insulin is required to uptake glucose into cells) ! reduces risk of type II diabetes, which can cause heart disease. •  May reduce risk of breast cancer by up to 50% •  Strengthens the immune system Overall: benefits of exercise leads to further activity That’s all folks!!...
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