Why does maximum heart rate drop with age?
A new study by a group led by Catherine Proenza, PhD and Roger Bannister, PhD from the University of Colorado School of Medicine reports that one of the reasons for the age-dependent reduction in maximum heart rate is that aging depresses the spontaneous electrical activity of the heart's natural pacemaker, the sinoatrial node. Eurekalert!
Exercise might boost men's sperm counts, study finds
Exercise may boost a man's sperm count, and therefore may improve a couple's chances of conception, according to a new study. In particular, men who lift weights or spend time working or exercising outdoors tended to have a higher-than-average sperm concentration in their semen, said study co-author Audrey Gaskins, a doctoral student at the Harvard School of Public Health. MedicalXpress
Mad cow disease: One in 2,000 in UK carry protein
Around one person in 2,000 in Britain carries the protein linked to the human version of mad cow disease, a figure higher than previous estimates, a study said on Tuesday. But how many people will actually develop the crippling and ultimately fatal disease is unknown, its authors say.
They also warn Britain to fight the risk of wider contamination through blood transfusions and surgical instruments. The study, published online by the British Medical Journal (BMJ), is the most exhaustive attempt yet to quantify the risk to Britons from the variant form of Creutzfeldt-Jakob disease, or vCJD. MedicalXpress
Crohn's and colitis may be tied to risk of heart attack, stroke
Researchers analyzed data from more than 150,000 inflammatory bowel disease (IBD) patients who took part in nine studies. They found that these patients had a 10 percent to 25 percent increased risk of stroke and heart attack, and that this increased risk was more prevalent among women. MedicalXpress
Studies show how critical sleep is to maintaining a healthy lifestyle
Three new studies show just how critical it is for adults to seek treatment for a sleep illness and aim for seven to nine hours of sleep each night in order to maintain a healthy lifestyle. MedicalXpress
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