Sensory deprivation tanks, oxygen therapy chambers and unbelievably cold saunas – oh my! These machines are used to reduce stress, ease pain and could be useful in doing that, but these machines are generally meant to be used in very specific situations.

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Sources:
http://www.sciencedirect.com/science/article/pii/0301051194900299

Floating Away: The Science of Sensory Deprivation Therapy


http://www.ncbi.nlm.nih.gov/pubmed/11854763
http://www.ncbi.nlm.nih.gov/pubmed/16341307
http://www.behavior.org/resources/677.pdf
https://www.researchgate.net/publication/282342776_Using_hyperbaric_oxygen_for_autism_treatment_A_review_and_discussion_of_literature
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4971045/
http://www.ncbi.nlm.nih.gov/pubmed/23682728
http://onlinelibrary.wiley.com/doi/10.1002/14651858.CD010789.pub2/abstract

Hot Trend: Tapping the Power of Cold to Lose Weight


https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3895006/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4008632/
http://www.austin360.com/news/lifestyles/recreation/cryochamber-more-comfortable-than-an-ice-bath-bu-2/nRbQH/
https://www.cooperinstitute.org/2013/09/whole-body-cryotherapy-wbc-does-it-speed-recovery/

Hot Trend: Tapping the Power of Cold to Lose Weight


http://www.hyperbariclink.com/diseases-and-conditions/decompression-sickness.aspx#.V8RBu5grKM8
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4586380/
http://www.ncbi.nlm.nih.gov/pubmed/27396361

Images:
https://en.wikipedia.org/wiki/Isolation_tank#/media/File:I-sopod_Flotation_Tank.jpg
https://en.wikipedia.org/wiki/Decompression_sickness#/media/File:Decompression_chamber.jpg
https://commons.wikimedia.org/wiki/File:ARDS_X-Ray.jpg
https://en.wikipedia.org/wiki/Cryotherapy#/media/File:Cryosauna_Bamboo.png
https://en.wikipedia.org/wiki/Brown_adipose_tissue#/media/File:Brownfat_PETCT.jpg

Sensory Deprivation Tanks, and Other Overblown Human Closets

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