What are the health impacts of standing / sitting while lecturing?

I often find myself lecturing for 7 hours in one day. This question is not about how to reduce my hours, it is about making healthy choices with my existing constraints.

I am lecturing to different classes during the day (it is not a single group of students for all 7 hours), in case that makes a difference.

I realize that during my lectures, I must choose what to do with my body. Should I sit (blood clots, deep-vein thrombus) or do I stand (I've heard non-lecturers complain about swelling legs when standing too much).

My questions are:

• What impacts are known from standing while lecturing for 7 hours per day, 3 days per week?


• Is it better to stand or to walk around?


• Is it better to sit for the whole time?


• Is it best to do a "little bit of everything?" If so, where is the optimal balance?

I realize that this might be specific to the person but I am hoping to find some experiences or, even better, research, which will indicate the best choices to make when one must lecture for many hours.