The saddles in the study were checked for fit to the horse (horses had to go with their own tack), but the same saddle was used for all riders in all weight categories, that's what I was referring to as not having been consideredI bet if you went to any yard and checked saddles there would be plenty that don't fit.
I agree totally that % bodyweight is pretty meaningless and not saying considering more variables would make that study 'good' just marginally better than uselessThat would be a better study, but I still don't think it would give a % of bodyweight figure, simply because I think a % of bodyweight is a meaningless guide. Again going back to mine as I know him (and rounding up to 400kg for ease/laziness lol), a 400kg 14.2 welsh D has a very different weight carrying ability to a 400kg 16hh tb. Now according to those quoting 10% you'd be looking at a weight of just over 6 stone - I don't know how they'd fair on the imaginary tb, but God help them on my cob if they go faster than a walk (and if they stayed in walk he'd probably go for a graze ), also most riders that weight are children & while he's fine as an occasional child's ride he isn't really a child's pony. Up it to 15% we're getting 9.4 stone all in, which he'd find very easy but would probably be getting close to the limit of what I'd want on the fictional tb. At 20% and 12.6 stone my cob is still laughing & acting the fool while I would have said too heavy for the tb & not allowed the rider on. However if any of these weights had been unbalanced my cob would have quickly looked lame.