July 29th, 2011 by PJSkerrett in Health Tips
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The brutal heat wave gripping much of the country this week is unpleasant for healthy folks. For people with cardiovascular trouble, hazy, hot, humid days can be downright dangerous.
Your body shouldn’t get too hot (or too cold). If your temperature rises too far, the proteins that build your body and run virtually all of its chemical processes can stop working. The human body sheds extra heat in two ways, both of which stress the heart:
Radiation. Like water flowing downhill, heat naturally moves from warm areas to cooler ones. As long as the air around you is cooler than your body, you radiate heat to the air. But this transfer stops when the air temperature approaches body temperature.
Radiation requires rerouting blood flow so more of it goes to the skin. This makes the heart beat faster and pump harder. On a hot day, it may circulate two to four times as much blood each minute as it does on a cool day.
Evaporation. Read more »
*This blog post was originally published at Harvard Health Blog*
July 6th, 2010 by Joseph Scherger, M.D. in Better Health Network, Health Tips, News, Research
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Most of us know that salt raises blood pressure in many people. When I learned that in medical school almost 40 years ago, I have not touched a salt shaker since. I enjoy having a low normal blood pressure. A new study published in the Journal of the American Society of Nephrology (July 2010) suggests that sugar, especially the fructose that comes from corn syrup, may also raise blood pressure.
A study team from the University of Colorado in Denver looked at sugar intake among thousands of Americans in a major national nutrition survey between 2003 and 2006. Those who consumed more added sugars, such as the fructose in soft drinks, had significantly higher blood pressures than those who did not and ate more natural foods such as fresh fruit. Fructose from corn syrup is a major cause of the obesity epidemic and may also be contributing to high blood presure, the most common chronic disease in adults. Read more »
*This blog post was originally published at eDocAmerica*
