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FEBRUARY 2025
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Hot Tub Therapy Offers Hope For People With Type 2 Diabetes
Hot tubs can improve insulin effectiveness, heart health and lower blood pressure in people with type 2 diabetes, new research has found.
The small-scale study involved immersing 14 participants with type 2 diabetes in 40°C water for one hour, eight to 10 times within a two-week period.
Produced by the University of Portsmouth, it’s the first study of its kind to show that participants experienced improved insulin sensitivity, which means the insulin they produced worked better after repeated immersion. Glucose levels didn’t change, but insulin levels were lower.
Dr Ant Shepherd, corresponding author on the research from the University’s School of Psychology, Sport and Health Sciences, said: “People with diabetes have high levels of sugar, which is what characterises the disease. What we want to do as scientists is to lower those sugar levels.

“While research on hot water therapy is still limited, this study has clearly found that being immersed in a hot tub made the participants’ bodies more sensitive to insulin.
“The pancreas is like a battery; you can only produce so much insulin and at some stage - particularly in those with type 2 diabetes - it will run out. If we can make people more insulin sensitive, producing less, it’s far better for the pancreas long-term.”
The study took place in a controlled laboratory setting where researchers could monitor the participants’ deep body temperature, as well as blood pressure and heart rate every 15 minutes, to ensure safety.
Read more about the study here.
Dr Ant Shepherd will be speaking about the topic in a free-to-attend seminar held on Wednesday 5 February at SPATEX 2025, held at the Coventry Building Society Arena. To register for your free ticket to the three-day trade event click here.
For more information contact the University of Portsmouth on 023 9284 8484 or visit www.port.ac.uk
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