Granston Techique
It's a very interesting topic...
Over here in the UK, a good 50% of my tools have so far been sold to Personal trainers or a better name might be 'functional trainers' and they are using these tools solely for increasing ROM with amazing results.
I learnt recently that Personal trainers in the US would'nt be allowed to use these tools for insurance reasons etc: - you'd have to correct me if that's not the case? But I have to admit that I was surprised to hear that - I was talking to Annette Lang and Adam Wolf recently when they were over in the UK a few months ago..
The PT's over here who are buying them are experts in functional movement and have a good understanding of fascia and the whole myofascial system, so they are using that knowledge to great effect.. the tools themselves are used in this instance to locate the fascial restrictions within the tissues. They then use them on certain areas to enable the muscles and fascia to glide again, helping with the ROM.
This type of tool use rarely causes bruising, although sometimes will cause the area to redden as the body sends more blood to that area.
There's a very experienced American Chiropracter called Tom Hyde (the owner of FAKTR) who's coming over here shortly to run a 2 day seminar pitched at PT's to teach them how to use these tools effectively.
The functional awareness that most of these PT's have is similar to the stuff taught over in the US by a chap called Gary Gray - http://www.grayinstitute.com/
I do have a lot of Chiropracters/Osteopaths/Physiotherapists and massage therapist who also buy these tools and although many of them use them in the same way for increasing ROM, they also use them in a slightly different way to break down local scar tissue.
Most of the design and developement work that I have done on our tools has been to enable them to do this as well as possible without damaging the good tissues surrounding it.. but at the end of the day - it always comes down to the training, experience and knowledge that each individual practitioner has, as to wether they use these tools safely. I would never want anyone to buy one of our tools (or anybody else's for that matter) who did'nt have a good understanding of what they are, how to use them and also have a really good understanding of how the whole myofascial system works. Making sense of the information that these tools can provide, also only comes with a good background of hands on palpation skills.
The best explanation I can give about how the tool itself works, is that it acts as an amplifier to the therapist.. If you think of it in the same way as an old fashioned record player, then the tool edge is (in a sense) very similar to the stylus of the record player. As you use it to glide over the tissues it picks up information about the state of the tissue, so in some cases it can be easier to detect areas that might be problematic... The way the edge is designed also makes it much easier to seperate tissues that have become 'stuck' so it's not neccesarily that you can do things that you cant with your hands - just that it can enable you to do the same things more effectively and quicker.
Try getting a t-spoon from your kitchen cupboard (not too sharp but a slightly rounded edge one) and, using the handle, rub it on an area of yourself that you think maight be restricted in some way. You should be able to feel the tissues quite well and in some cases (if the edges are good enough) you may be able to feel the tissues change as you scrape over them. If that works then buy some cheap gua sha tools and have a play around with them instead as they will work slightly better!
The stainless steel tools are simply an imrovement on the gua sha tools and can give you even more feedback and control.
My wife uses both - gua sha and steel (dependant on the client or body area she is working on) and still uses her hands for parts of her treatments too. It's just another tool to have in your toolbox at the end of the day, but it goes a long way to saving your hands.
Sorry if I've rattled on and written an essay, but I hope this helps