How much would this kind of cardio interfere with muscle gainz?

Monday: 45 minutes of swimming @low-moderate intensity Tuesday: gym (1st day of 3 day split) approx. 1 hour Wednesday: same as monday Thurs: gym Friday: same as wed/mon again

from Bodybuilding News Updates http://forum.bodybuilding.com/showthread.php?t=172462193&goto=newpost
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