My advice : do it 1 time, for 2 to 5 minutes, every two hours.

It seem that, the effect of 2 minutes of unloading persist for 2 hours.
So if we always decrease anterior scalene muscle tone, it may atrophy.

It has worked for me. For the vein compression.

other infos on decreasing muscle tone and more :

http://www.ncbi.nlm.nih.gov/pubmed/15737443
http://ptjournal.apta.org/content/65/9/1358.full.pdf
http://www.profedf.ufpr.br/rodackibi...%20stature.pdf