Participant characteristics
IAH, hypoglycaemia
RECRUITMENT, TYPE 1 DIABETES, HYPOGLYCAEMIA
Recruitment was carried out from January 2019 to March 2021. Of the 30 participants screened and consented, seven did not meet the inclusion criteria and one withdrew before commencing the study because of time constraints. Twenty-two participants were randomised but four were withdrawn during the study period as a result of pregnancy (HIT4HYPOS study CONSORT flow diagram. The 18 participants (nine men and nine women, age 20–54 years, all white) who completed the study had long-duration type 1 diabetes [median (IQR) duration 27 (18.75–32) years] and IAH, defined by at least one of a Gold score ≥4 (RT-CGM vs RT-CGM+HIIT: 5/9 vs 5/9), modified Clarke score ≥4 (RT-CGM vs RT-CGM+HIIT: 7/9 vs 8/9) or DAFNE hypoglycaemia awareness rating 2 or 3 (RT-CGM vs RT-CGM+HIIT: 7/9 vs 9/9). Mean (SEM) HbANine participants randomised to RT-CGM+HIIT were able to complete the intervention and to achieve at least 90% of their peak heart rate obtained during the 