why do people with a leaky valve find it difficult to exercise

•

backflow can occur or some blood flows backwards

•

less blood leaves the heart or less blood is pumped around the body or some blood stays in the heart (instead of being pumped out) or reduced blood pressure or reduced flow rate

•

less oxygen supplied to muscles / cells

•

(so) less aerobic respiration

•

(so) less energy released

•

(so) less (efficient) muscle contraction

•

anaerobic respiration takes place

•

less (efficient) removal of lactic acid or lactic acid builds up or oxygen debt occurs

•

(lactic acid building up) causes muscle fatigue

•

less (efficient) removal of carbon dioxide (from blood)