"Resistance training in not effective in improving maximal oxygen uptake. Training with high intensity and low volume results in no change or a decrease in capillary density, no known change in ventilation, no improvement in oxygen extraction, and very high blood lactate concentrations. Conversely, low-intensity, high volume training may increase capillarization and improve extraction."
"Aerobic exercise training results in increased maximal cardiac output and maximal oxygen uptake, slower resting heart rate, increased capillarization, improved ventilation efficiency, increased oxygen extraction, and OBLA (onset of blood lactate accumulation) occuring at a higher percentage of aerobic capacity."
Both from Essentials of Strength Training and Conditioning, Beauchle and Earle, Editotrs., 2nd Ed. (NSCA)