here, here and here.
Over the second week of doing a standing desk, I started to feel more fatigue and I found that it affected my ability to work well. When I'm doing non-intensive tasks that don't take a lot of creative mental energy, I can push through the physical weariness and keep working. The more mentally demanding jobs, however, were much more difficult to do. Toward the end of last week I found myself taking more breaks to sit and, on Friday, ending out my day on the couch. I just didn't have the physical energy to keep going to write more in-depth work.
Today I'm standing again and I plan to continue standing most of the time. But I do appreciate what I learned from last week. I am a whole person and my physical state has a large effect on my mental capabilities. When I'm tired physically I don't perform as well mentally. It will take some time for me to have the physical/mental endurance to work standing all the time.
I'm also going to experiment with not doing any recreational computing from the standing position. So when I take breaks to check Facebook or play video games, I'll do it sitting. That will serve as a good mnemonic device to signal my body and mind to get into work mode when standing or relaxation mode when sitting. I find that I can relax more when I have a clear difference between the posture of relaxation and the posture of work.
What thoughts do you have? Have you taken the plunge and started standing?