Before when i never used to know how to properly train, and at a younger age, I would run, on concrete/asphalt, on non-high intensity days with a flattish footed strike/midfoot strike:
Tues. -5X200m 4.5min.rest at 29,28,27,26,25 pace
Fri. -5X100m 3min.rest at 17,16,15,14,13 pace
high intensity days i'd run with forefoot strike:
Mon. -3X10m,1X20m,1X30m,1X40m,1X50m,1X60m, 1X350m
Thur. -3X10m,1X20m,1X30m,1X40m,1X50m,1X60m, 1X250m
Now that I think about it perhaps those flat-footed strikes on non-high int. days may have been worse for the legs bones, joints, tendons, and ligaments than the high int. days, seeing that I did all of this training on asphalt/concrete track.
My daughter ran much of her Extensive Tempo on asphalt and concrete with her track squad, and I believe all this pounding on her heels is what led to her shin splints. Since we've reduced Extensive Tempo and all runs over 400m (she rarely runs over 300m), she has had no problems with shin splints. Her recovery doesn't seemed to have suffered, and she actually feels better and has more energy, which has allowed us to add another moderately high intensity day (see my last post).