Hi

I actually treated a man last night at my school's massage clinic with shin splints...
Shin splints usually occur for a few reasons...
#1- not wearing proper foot wear... you need shoes that are soft and have good arch and ankle support...
#2-not stretching before you go walking... you have to warm up your muscle or else you cause microtearing of the muscle...
#3-from a dietary imbalance... not enough potassium or sodium... eat bananas and things with salt in them...
Hope this helps...
Good Luck!
Shia