Thanks for the video. I agree with some of what was said, but the suggestion not to use the straps while walking puzzles me - its like suggesting that one use a chain saw without starting the engine! There is a good explanation for this on
Pete's Pole Page - the granddaddy of internet resources on pole use. Basically, the strap allows the arm to generate a downward force without the hand having to continually grip the pole. Gripping the pole can only be sustained for short periods; use the straps correctly and poles can pretty much be used all day for days on end.
The figure of 30% used in the video doesn't make a lot of sense to me in a static sense, but there may be sources that have tested the dynamic load reduction of pole use. My reasoning is that for my current sprung poles (Komperdel and Black Diamond) it takes the equivalent of a 15kg force to fully compress the spring mechanism. I have done that on steep downhill sections, but never on flatter terrain in normal walking. Reducing the static load on my ankle, knee and hip joints by 15kg is a long way short of 30%, even accounting for the weight of the leg below these joints. .
I have seen reports from skiing accidents where the pole strap has compounded the injuries, but never from accidents at walking speed. The difficulty here is that I may not be looking in the right places, so it might be possible that shoulder dislocations have occurred that could be directly attributed to wearing the strap while walking, and have not been reported in a way the information is not appearing in search results.
Regards,