“ The first issue to be addressed is how long has it been since you did a serious, regular running program? If it has been several months or years, then yes, running will adversely affect your lifting.
If you haven't been running lately and want to begin a running program, whether for fitness or sport, start easy and build up—just like starting up a weightlifting program.
Also, if possible, do your running on non-weightlifting days. If you have to do it on the same day as you lift, do it after your lifting. Until you get in some sort of condition for a running program, you should back off your lifting a bit, as your energy will suffer for a while and will affect your lifting. ”