If with speed you mean the speed one runs [not the illegal one] - the heart rate is not dependent solely on the speed one runs, it is only one of many different indicators. Ironically, the drug speed also lifts the heart rate as do emotional states and bodily ailments.
Parasites and age affects monkeys in the same way as it does humans. Well known public parasites such as solicitors and politicians are well documented to bleed the general public dry with dubious protected services for outlandish fees. It is enough to age anyone 5 years in one visit.