Dr. Bowker sent me an email yesterday of a study he did and just recently published and gave me permission to share. 
Here it is.  I copied and pasted so hope the PDF file will open for everyone.
I see the PDF file didn’t transfer with the email.
Anyone know how I can do it?  It’s a 15 page fine print document. 

“Hi Pat here is step counter data etc. just published it but did work 15 years ago. bottom line is that (1) horses on pasture 24 hours move more than any other condition. (stall 24 hours, half stall and half pasture etc). [ 11 of my own horses that had been together for several years so they knew each other and had their pecking orders etc. ] BUT THE HORSES ON PASTURE HAVE MORE STEP DURING THAN  DAY TIME  (NOT DURING NITE TIME) THAN IF THEY ARE IN A STALL FOR A FEW HOURS. STALL SEEMS TO INHIBIT MOVEMENT. (2) in stall they do not have any steps at all hardly. (2) depends upon when put them in; (1) i put two halflings together; they were sisters; together  for years  (7-9 yo) BUT were new to surroundings; paddock was 20 yards x 40 yards) and there movements were very high (innterms of numbers of step per hour) for first year (recorded 3 + times during year).  after one year they calmed down to that on pasture (with stall). my interpretation is that they were very nervous even when placed together with sight of other horses. (they just paced paddock day and nite)'

 you can send paper to whomever as is on line, free ete. 

thanx, bob b”