The science behind sensory deprivation tanks

Float tanks and sensory deprivation tanks are all the rage, but what are their benefits and do they work? We sat down with GP Dr Michela Sorensen to get the lowdown on this health trend. 

Sensory deprivation tanks – also known as float tanks, floatation tanks, isolation tanks and restricted environmental stimulation therapy (REST) tanks – are filled with skin-temperature water (approximately 35C) and Epsom salt (a compound of magnesium and sulphate). 

The tank is dark and soundproof, and the high salt content makes it easy to float on your back. A float tank session generally lasts an hour. 

“Sensory deprivation tanks work by removing any form of stimulation from the surrounding environment which is thought to induce deep relaxation both physically and psychologically,” explains Michela. “This state of deep relaxation is thought to improve a variety of conditions.” 

Sensory deprivation tanks are believed to improve a range of physical and mental health conditions, including: 

• Stress, anxiety and depression 

• Muscle tension and fatigue 

• Pain 

• Migraines 

• Sleep quality 

• Mental focus 

“There is certainly some scientific research behind the claims of a variety of health benefits associated with sensory deprivation tanks, particularly when it comes to managing anxiety and improving muscle recovery, concentration and pain management,” says Michela. “However, most of these studies are quite small and involve a very limited snapshot of the population. So, while the early evidence is positive, it’s an area that needs further research.” 

Sensory deprivation tanks are purported to enhance creativity, but more research is needed to demonstrate the veracity of these claims. 

The deep state of physical and mental relaxation brought on by floating in a sensory deprivation tank is believed to be responsible for the reported decrease in stress and physical pain. 

You will be asked to shower before your float to keep the tank sterile. Floating nude is recommended, but you may choose to wear earplugs to keep the salty water out of your ears. You can choose to leave the lid of the tank open or close it. 

It may take you a while to relax, but taking deep breaths can help you settle in. You’ll be advised when your session is over and you’ll need to have another shower to rinse off the salt. 

Float tanks are generally considered safe for healthy people over the age of 16, but those with chronic health conditions should seek medical advice before using one. 

“People who have a history of hallucinations, claustrophobia or any form of heart disease should see their doctor prior to using these devices,” says Michela. “Anyone with a background of seizures should also have a thorough medical review beforehand.” 

Please note: The tips throughout this article serve as broad information and should not replace any advice you have been given by your medical practitioner.