Does exercise in cool water cause a higher risk of hypoglycaemia than in thermoneutral conditions in type 1 diabetes?
Authors' conclusion
Exercise at 40% V ˙ O 2peak performed in a basal insulinaemic state in cool water in people with type 1 diabetes does not cause a greater decrease in blood glucose concentration than in thermoneutral water or on land, but blood glucose increases early during on-land recovery, probably as a result of a transient fall in plasma insulin.
Study context
- Population
- Overnight-fasted individuals aged 18–40 years with T1D
- Participants
- 8 individuals
- Comparison
- Cycling in cool water vs thermoneutral water vs on land
- Primary endpoint
- Change in blood glucose concentration during exercise
Primary result
As reported in the abstract
Blood glucose concentration during cycling
- Blood glucose did not change during cycling in cool or thermoneutral water
- p>0.05
- Blood glucose decreased during cycling on land
- p<0.05
Further findings
Plasma insulin · during and early after cycling
- Plasma insulin decreased during and early after cycling in cool water
- P < 0.05
Blood glucose during 60 min on-land recovery (24°C)
- Blood glucose increased significantly after cycling in cool water
- ≈2 mmol/l, p<0.05
- No significant increase after cycling in thermoneutral water or on land
Original publication
Does exercise in cool water cause a higher risk of hypoglycaemia than in thermoneutral conditions in type 1 diabetes? Diabetologia. Published 18 June 2025. doi:10.
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