1. Cardiovascular drift Increase in HR as exercise at same intensity Why
Stroke Volume decreases when working in warmer climates
Because there is an increase in blood flow to the skin in an attempt to lose heat through conduction, convection and evaporation
This means less blood returning to the heart
Therefore reduced SV
To maintain cardiac output, HR must increase

2. CV Drift 2. Blood plasma volume decreases
Fluid seeps into surrounding tissues and cells
Fluid lost to sweating
If athletes fail to re-hydrate, can further reduce the volume of blood returning to heart
Causing a fall in SV