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It is therefore no surprise, when climbers complain of back pain under or around the shoulder blades - the muscles have to work from a different fulcrum than that which they are designed.
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Can you elaborate?
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Sorry I didn't get 'back' to you on this sooner Mahk.
The best analogy is tree mechanics and cabling - I bet you've sussed it already.
I showed dee Mathecks book on tree mechanics. She understood straight away, similar principles at work in the body.
Because wearing a high back pad prevents the spine and its muscles from acting along their entire length, as they are designed to be, the force is localised around the shoulders.
Similar to a tree that is staked too high, when it needs to flex low down to place adequate taper. The forces become localised in a higher area above the tie. The tree builds strength in that area. Trouble comes when the tie is removed, and the tree breaks lower down where it is weaker, when higher than average forces are applied above.
This helps explain why inappropriate back support can cause lower disc failure (when most people think the opposite), and dysfunctional muscle movement (pain and limited range of movement, leading to surgery/disability if un-corrected). A harness that prevents the spine from working along its length is inapprpriate for tree work positioning, in our opinion, because the muscular skeletal system is restricted, and the internal organs are compressed in two directions. This can also lead to kidney dysfunction and pain. A colleague I worked with for several years suffered from kidney pain about 15 years ago. After constant trips to the doc, stopping drinking alcohol and repeated tests, it came back there was no problem. But the pain continued; sometimes he'd nearly pass out with sharp pain. The past 10 years he has given up tree climbing, and worked as a lorry driver, and never had any pain since. His harness could have been a major contributing factor. The reason I mention it, is because during my rehab, i was asked by Dee if I or any climbers I new suffered kidney pain, because she wouldn't be surprised if they did.
The challenge comes from providing adequate support without limiting natural movement, or compressing internal organs, when designing a harness back pad.