Final answer:
The contraindication to aerobic exercise are low hemoglobin and low hematocrit levels, indicative of anemia, and high hemoglobin and high hematocrit levels, indicating polycythemia. Option d.
Step-by-step explanation:
The hematologic values that are a contraindication to aerobic exercise are those reflecting an abnormal red blood cell count or hemoglobin levels which could negatively affect the oxygen carrying capacity of the blood. Given the options provided, low hemoglobin and low hematocrit (option d) are indicative of anemia, a condition where the tissues do not receive sufficient oxygen. This makes it difficult to sustain aerobic activity.
Conversely, having an abnormally high hemoglobin and high hematocrit (option c), which are signs of polycythemia, can also be problematic as it can raise the viscosity of the blood. Polycythemia makes it difficult for the heart to pump blood and can increase blood pressure, posing a risk during exercise. Option d.