Hey Nick, I used to play baseball in high school. During the pre-season we were doing alot of indoor running. From Running indoors on the hard floor i developed shin splints. I played through the pain. tHE PAIN WASNT INSTANT PAIN. It was the pain wich hurt like hell after i relaxed and when i say pain i mean PAIN. So after my season i couldnt take it anymore. I figured they were just shin splints, boy was i wrong. My calfs were the actually the ones injured, the sac was inflamed for some odd reason, (this is rare)wich was casuing the pain causing the shin splints also. So hey really if the pain does not go away with rest, i recommend seeing some one about it.
Also I recomemnd actually going to the shoe store and buying actual running shoes, they seem to help alittle with the pressure. Also if you still need to do your cardio, i would suggest low impact cardio right, such as those mountain climbers where you dont actually lift your legs up and come down ya know. just intill untill the pain goes away, BUT Because the pain is gone does not mean it wont come back again Shin Splints really suck big time. I feel your pain and i hope eveyrhting works out good. Any other questions about my condition drop me a pm. See ya. Goodluck