Final answer:
The 50-year-old woman has one net positive risk factor: her slightly elevated blood pressure of 120/90 mm Hg. Her other health metrics, including cholesterol levels and having quit smoking, do not contribute additional risk factors. Starting an exercise program is a proactive step to further reduce her risk of cardiovascular disease.
Step-by-step explanation:
To determine the number of net positive risk factors, we must evaluate the individual health metrics provided: a blood pressure (BP) of 120/90 mm Hg, a body mass index (BMI) of 29 kg/m², low-density lipoprotein (LDL) cholesterol of 135 mg/dl, and high-density lipoprotein (HDL) cholesterol of 70 mg/dl.
Considering the risk factors for cardiovascular disease, the BP of 120/90 mm Hg is at the high end of normal, and the BMI of 29 kg/m² classifies the woman as overweight. However, the LDL cholesterol level is below the risk threshold (typically 160 mg/dl for those at low risk), and the HDL cholesterol level is quite good (>60 mg/dl is considered protective against heart disease). Given that she has quit smoking, this also reduces her risk profile significantly.
Therefore, the net positive risk factors from the information provided would be one: the slightly elevated blood pressure. The overweight status might also be considered a risk factor, but exercise is an excellent step towards reducing this risk. It is important to note that individual risk factors should be evaluated in the context of the overall clinical picture, and a healthcare provider should be consulted for a comprehensive risk assessment.
The benefits of exercise, such as a reduced risk of heart attack by nearly 50 percent, make it a commendable decision for her to start an exercise program. Exercise should be moderate and could include noncontinuous sessions totaling 30 minutes over the course of each day.