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“Yeah, I brought my heart rate down from 80 to 45 beats per minute resting….” The boasting drawl came from behind me as I waited in the starting corral of the Rock and Roll Marathon in Raleigh, cheap jordan shoes , N.C. It may seem like an odd comment to those not in endurance sports, but for distance runners, cyclists, cheap air jordans , swimmers and triathletes, cheap jordans online , a sluggish resting heart rate can be a matter of pride. No one knew exactly what causes athletes to have this slow heartbeat, cheap jordans for sale , a condition called sinus bradycardia. Now, cheap jordans , a study by cardiac physiologist Alicia D’Souza and colleagues from the University of Manchester in England finds the answer in certain “funny channels” in the sinoatrial node, the pacemaker for the heart. The slower heart rate isn’t as funny — it has fewer funny channels to transmit current that controls the activity of the heart cells. The results suggest a mechanism for sinus bradycardia in athletes, cheap jordans free shipping , and also might help scientists understand why athletes can have heart problems later in life. The study started close to home. “I had a Ph.D. student, Will Morris, cheap wholesale jordans ,” says Mark Boyett, cheap real jordans , a cardiac physiologist and lead author of the study. “He’s a cardiologist and he’s also a very keen cyclist. He was telling me that his heart rate when he is race-fit is 42 beats per minute!” A normal heart beats at around 70 beats per minute at rest. A professional athlete in top condition will cut that number in half. Many amateur athletes wear their reduced heart rates http://www.kiteaway.co...topic.php?f=1&t=71091 http://al-inshad.com/v...e&p=617465#post617465 http://www.clanto.aaf....hread.php?thread_id=18845 |