on my way out the door, but in short, you cardio vascular system is impacted by the movement of your extremeties in either case......as long as your heart rate is in it's training zone, it doesn't matter what you are doing from an effectiveness standpoint. That said, the impact of running certainly has it's downside in the feet, ankles, knees, hips (and even low back), whereas swimming is only impacting the shoulders in most cases.
Also, I wouldn't reccomend doing anything for 5 days straight (the same activity) Give yourself a day off, one day (at least) of strength training (performed PROPERLY.....if you don't know, ask someone QUALIFIED)
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"One small heart, and a great big soul that's driving"
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