Answer:
Smoking.
Being overweight or obese.
Lack of physical activity.
Too much salt in the diet.
Too much alcohol consumption (more than 1 to 2 drinks per day)
Stress.
Older age.
Genetics.
Cardiac output.
Peripheral vascular resistance.
Volume of circulating blood.
Viscosity of blood.
Elasticity of vessels walls.
Explanation: A lot of things acually.
If you are training resistance, then you should be lifting at two second per lift, while slowly lowering over time. This is the most efficient way to build resistance.
How badly the person is injured (how deep the cut or how bad the tear) and their body type.