Ergonomic shoulder straps that reduce shoulder pain
Feb 15, 2022 at 12:53 am #3740407
Companion forum thread to: Ergonomic shoulder straps that reduce shoulder pain
Two methods for reducing backpack shoulder load have been well known.
One is the load distribution to the lower back with hipbelt or lumbar pad. The other is the load distribution within the shoulder area…Feb 17, 2022 at 12:58 am #3740615Rex SandersBPL Member
Interesting! If I understand your video correctly:
– Keeping heavy weight close to the back is very important for reducing pain.
Good to know that measurements confirmed conventional backpacking wisdom.
– Changing shoulder pad thickness can also reduce pain.
The diagram looks like pad thickness and pressure was less over the clavicle, transferring more pressure across the top of the shoulder, and just below the clavicle.
As you noted, with only 8 male subjects, hard to know if this design works for a wider range of people. Are you planning any more tests?
— RexFeb 19, 2022 at 8:09 am #3740790
Thank you for your comment.
In the experiment, the strap didn’t have an buffering effect by itself as it was made of solid PVC sheet. And the pad for padded level was the same material. The purpose was to investigate the effect of load separation.
Regarding the small number of subjects, I couldn’t perform the experiment fully owing to Covid pandemic.
Now this research has closed, but when the product whose spec is applied is developed, I will confirm this effect, again.
For the loading on the clavicle, some adverse effects are reported. So, its load needs to be reduced. What I have to investigate is the adverse effect due to loading on the portion under the clavicle.Feb 23, 2022 at 10:50 am #3741313Russell BiserBPL Member
Have you compared this to Klattermusen’s butterfly bridge / carry on bone system which seems to do the same thing?Feb 23, 2022 at 1:03 pm #3741321JohanBPL Member
Interesting stuff. As someone who suffers from spinal birth defects and can’t hold much weight on my shoulders regardless of strap design, I have found that once a pack is beyond the 20lb mark, using a front pack eliminates all of my shoulder and back pain. It does require a more robust hip belt to then take the load, but the system works great. My front pack only adds 1 ounce of weight because I modified my bear bag to clip to my shoulder straps and hip belt.
I personally think not anywhere close to enough people are using chest/front packs that hook into either the shoulder straps or go around under the armpits and connect directly to the main pack. Beside shoulder pain, there is also a lot of energy loss in trying to keep one’s body balanced with a huge imbalance in the load.Feb 23, 2022 at 8:49 pm #3741371
Thank you for your comment.
I haven’t tried butterfly bridge.
It seems easy to establish the strap position onto the clavicle when users wear the backpack to place V-shaped frames over the clavicle.
And regarding the clavicle load, it would be designed for applying larger in lateral part than in medial part. It might be reasonable design for the clavicle to avoid moving downward that compress the brachial plexus and axillary artery, relatively.
But, on the whole, it is designed to support the load on the clavicle positively. So, I think it would be an opposite concept for my suggestion.Feb 24, 2022 at 2:55 am #3741381
Thank you for your comment!
Even if shoulder load is distributed within shoulder area, the compressive load of intervertebral discs can’t be reduced. So, in your case, I think that distributing to the lower back is necessary. Also, it is necessary for your lumbar spinal moment to be reduced by way of keeping load balance between front and back even.
Contrarily, the constraint due to hip belt generally brings compensation in walking motion.
It reduces the relative phase between thorax and pelvis in walking with backpack and hip belt, comparing to that in natural walking. And, to keep the same walking speed, it’s necessary for stride larger, regardless of less range of pelvic rotation.
Considering both aspects, users should choose a better way to reduce shoulder load depending on their situation.Feb 24, 2022 at 8:49 am #3741388Russell BiserBPL Member
“But, on the whole, it is designed to support the load on the clavicle positively. So, I think it would be an opposite concept for my suggestion.” It doesn’t feel like it. Having used it myself it does seem to deload the clavicle itself if one side of the V is on each side of the clavicle, and the stiffening provided by each arm of the V accomplishes something like the thickened padding does in your straps.
“it would be designed for applying larger in lateral part than in medial part.” I have not noticed this in actual use.
Achieving this with differing padding thicknesses is more elegant, manufacturable, and ultralight though, so style points to you.Feb 24, 2022 at 9:14 am #3741389
Thank you for sharing user review!
Sorry, I haven’t actually try it.
Therefore, my comment was a design review only based on the description of official site. The actual performance seems to be different.
I want to try it, one day! Thanks.
- You must be logged in to reply to this topic.
Our Community Posts are Moderated
Backpacking Light community posts are moderated and here to foster helpful and positive discussions about lightweight backpacking. Please be mindful of our values and boundaries and review our Community Guidelines prior to posting.