Balance is task specific.  So, balance tests in stance position do not predict balance in walking.  Tandem stance and tandem walking are artificial tasks.  So  people have poor results because the task is unfamiliar. 

Jacques VANDEN-ABEELE, Université de Sherbrooke, Québec, Canada

There are articles with validation for TUG in patients with Alzheimer disease.

Look for Julie D. Ries, Test-Retest Reliability and Minimal Detectable Change Scores for the Timed "Up & Go" Test, the Six-Minute Walk Test, and Gait Speed in People With Alzheimer's Disease (2009) and search for references in other articles validation.

Felipe de Oliveira Silva, UFRJ, Brazil

I agree with Felipe and I recomended:  Timed Up & Go; the Six -Minute Walk test.

The following is written in Wikipedia under the title „Gleichgewichtsfähigkeit“

Mittlerweile wurde herausgefunden, dass es keine Gleichgewichtsfähigkeit gibt. Die Gleichgewichtsleistungen des Menschen sind fertigkeitsspezifisch.

According to contemporary scientific thinking it is more important to consider “stability” than “balance.”

Suggested readings:

Bruijn SM, Meijer OG, Beek PJ, van Dieën JH. Assessing the stability of human locomotion: a review of current measures. J R Soc Interface 2013;10: 20120999. http://dx.doi.org/10.1098/rsif.2012.0999

Hurmuzlu Y, Basdogan C. On the Measurement of Dynamic Stability of Human Locomotion, Journal of Biomechanical Engineering 1994;116(1):30-6

Dingwell JB,Kang HG. Differences Between Local and Orbital Dynamic Stability During Human Walking. Journal of Biomechanical Engineering 2007;129(4):568-593 :

Many thanks for your input. I highly appreciate your comments!

ONe leg standing and Monica van Eijk has in here thesis CRAMPS this test little correct esepcially in time. Rikli and Jones have test of 7 itens that all are possible by dementia p[atients and give an view what this patient can compare with even old individuals with no dementia

TUG test is possible and the BBS is possible but often to ngreat for dementia patient to do in one time

I further try to investigated the perception and the only test that was good possible was the test for the gnostic sense with an tuning fork.

succes

jan van de Rakt