From this article Weight Training Has Unique Heart Benefits, Study Suggests:
“An acute bout of resistance exercise shows many favorable cardiovascular benefits and should therefore be considered as part of a daily exercise training program".
When compared to aerobic training resistance training resulted in increased blood flow to the limbs and a longer-lasting drop in blood pressure after exercise.
"Resistance exercise may offer greater benefits from the increases in blood flow to active muscles and could be implemented as companion to an aerobic training regimen, according to the new study".
Especially because of its ability to increase blood flow to active muscles, weight training could be a valuable companion to an aerobic training regimen. "This may be of greatest importance to women, as they can derive important weight-bearing benefits of resistance training to help prevent and/or treat osteoporosis,"