This is probably the wrong place for this, but I'm asking here since you guys are more likely to have delved enough into the game to possibly have an answer. I know Sprint speed is affected by the weight of the items you have equipped, but how is your basic movement speed determined? How does the game decide how fast you move in Heavy Armor versus Light Armor? Is it determined by Weight? Or is there some other system that is used? What if you're wearing some Light Armor, some Heavy Armor, and some clothing?

I goggled for an answer, but it doesn't look like anyone knows what formulae are used for modifying your speeds based on what you are wearing. All I could find was that heavy slows you down more than light. Maybe you could do some timed distance runs wearing various things to find out.