It means that there are signs in the ECG signals that your heart is suffering from ischemia during maximum physical effort.
The signs are however borderline positive, which means that the conclusion of ischemia could be wrong or that the ischemia is minimal.
Are there followup actions planned?
If it really is ischemia, the least you should do is try to avoid it from getting worse. (healthy lifestyle, blood pressure control, cholesterol lowering medication, ..)