Additionally cerebrospinal fluid biomarker amounts indicate a larger disease burden in youthful than in older people. Related StoriesStudy discovers high prevalence of dehydration in the elderly living in UK treatment homesMayo Clinic's Florida campus awarded NIH grant to identify vascular risk elements in ageing and dementiaOlder adults with dementia make more frequent visits to emergency departmentsHolland said it isn’t clear why Advertisement is more aggressive among younger elderly.Could it be healthful? ‘They're in amazing shape overall, and We've never heard of any problems from an extended high heart rate unless there's a pre-existing condition. However they could be exhausted for a complete week after battling the big waves,’ she said. Unlike human surfers, dolphins' heart rates go down when they're riding waves. When Williams was attempting to measure center rates of swimming dolphins, she couldn't maintain them from riding her boat's bow wave.