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Passive Wearables for Improving Human Function and Movement

Has anyone ever looked into making some passive wearables to reduce metabolic costs/improve strength? CMU developed this lower-limb exoskeleton about a year ago that's just a spring and some gears attached to the ankle, and it's capable of reducing up to 10% of our total effort while walking (i'll post links below). 

How would we go about creating a more powerful version, with/without power? I'm thinking of running more bands along the ankle in parallel with the original, but I'm not so sure that'd be the best option.

Here's the links/pictures for it.
https://www.nsf.gov/news/news_summ.jsp?cntn_id=134667
http://biomechatronics.cit.cmu.edu/publications/Collins_2015_Nature---Photos.html
http://www.nature.com/nature/journal/v522/n7555/full/nature14288.html
http://biomechatronics.cit.cmu.edu/publications/Collins_2015_Nature.pdf

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  1. The main problem is powering the wearables, after awhile the spring leg would get exusting to wear and use. There are some clever ways to power devices, if I were you that's what I would look into.
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