1.6 Cardiovascular Drift Flashcards
1
Q
what is cardiovascular drift
A
an increase in HR despite working at the same intensity
2
Q
when does cardiovascular drift usually occur
A
15-20 minutes into exercise
3
Q
what exaggerates CV drift
A
- hot conditions
- dehydration
4
Q
what causes CV drift
A
- fluid is lost as sweat
- resulting in a reduced plasma volume
- so increase blood viscosity
- so reduced venous return
- so stroke volume decreases
- meaning HR increases so CO can remain similar
- because HR x SV = CO
