What is Cholesterol?Cholesterol is a sterol (a combination steroid and alcohol). Cholesterol is a lipid found in the cell membranes of all tissues, and it is transported in the blood plasma of all animals. Because cholesterol is synthesized by all eukaryotes, trace amounts of cholesterol are also found in membranes of plants and fungi.The name originates from the Greek chole- (bile) and stereos (solid), and the chemical suffix -ol for an alcohol, as researchers first identified cholesterol in solid form in gallstones by Francois Poulletier de la Salle in 1769. However, it is only in 1815 that chemist Eugene Chevreul named the compound "cholesterine".[2]Most of the cholesterol is synthesized by the body and some has dietary origin. Cholesterol is more abundant in tissues which either synthesize more or have more abundant densely-packed membranes, for example, the liver, spinal cord and brain. It plays a central role in many biochemical processes, such as the composition of cell membranes and the synthesis of steroid hormones. Cholesterol is insoluble in blood, but is transported in the circulatory system bound to one of the varieties of lipoprotein, spherical particles which have an exterior composed mainly of water-soluble proteins. The main types, low-density lipoprotein (LDL) and high-density lipoprotein (HDL) carry cholesterol from and to the liver.According to the lipid hypothesis, abnormally high cholesterol levels (hypercholesterolemia) and abnormal proportions of LDL and HDL are associated with cardiovascular disease by promoting atheroma development in arteries (atherosclerosis). This disease process leads to myocardial infarction (heart attack), stroke and peripheral vascular disease. As high LDL contributes to this process, it is termed "bad cholesterol", while high levels of HDL ("good cholesterol") offer a degree of protection. The balance can be redressed with exercise, a healthy diet, and sometimes medication. |
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Pumping Iron Improves Heart Health The blood pressure increase above resting values during weight lifting is variable and can be of considerable magnitude (1-4). BestHealth Weight training improves cardiovascular function by decreasing an individual's blood pressure and heart rate when lifting or carrying objects, says Franklin FAQ2 Even though the effort of lifting weights may cause blood pressure to rise slightly, if done correctly, weight training does not increase blood pressure to High Blood Pressure and Weight Lifting During my periodical medical check ups my doctors continue to warn me about weight lifting, since in their view it can cause high blood pressure. High Blood Pressure and Weight Lifting - High Blood Pressure However, if you have a weak heart or high blood pressure, check with your doctor before starting a weight-lifting program. Weightlifting: Bad for your blood pressure? - MayoClinic.com Holding your breath can lead to dangerous increases in blood pressure. Instead, breathe out as you lift the weight and breathe in as you lower the weight. Weight training: Do's and don'ts of proper technique - MayoClinic.com They discovered that during weight lifting and strength training, blood pressure, which is normally about 120/80, rose to as high as 300 during heavy weight Weight Lifting Health Risks. Can Weight And Strength Training In a nation obsessed with looks and fitness, weight lifting is the latest workout craze. Recent studies have shown that lifting can lower blood pressure, 2004 Pulitzer Prizes-EXPLANATORY REPORTING, Works Learn what precautions people with high blood pressure should take when weight lifting from MedicineNet's expert medical doctors and healthcare Ask the Experts: Fitness: Weight Lifting and High Blood Pressure High blood pressure and weight lifting - high blood pressure problems and bodybuilding. |
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