## 3 Results  
Six subjects completed a total of 198 HIIT sessions and 97% of those sessions exceeded an RPE \(\geq\) 8. Ten sessions were not performed due to hypoglycemia prior to the beginning of the session, and eight sessions were not conducted for other reasons (i.e., professional/personal reasons). Subject age was on average 37 years, with a diabetes onset of 8 to 19 years prior to the beginning of the study. Patients were not obese. No dietary modifications were needed for unbalanced diets. Subjects' characteristics at baseline are presented in Table 1. \begin{table}
\begin{tabular}{c c} \hline \hline
**n** & **6** \\ \hline Age (years) & 36.7 \(\pm\) 6.1 \\ Diabetes duration (years) & 15 \(\pm\) 5.5 \\ Weight (kg) & 78.5 \(\pm\) 6.1 \\ BMI (kg/m\({}^{2}\)) & 25.1 \(\pm\) 1.8 \\ HbA1c (\%) & 7.25 \(\pm\) 0.82 \\ Insulin total daily dose (U) & 36.3 \(\pm\) 5.7 \\ U/kg/day & 0.5 \(\pm\) 0.1 \\ \hline \hline \end{tabular} Mean values and SD.  
\end{table} 
Table 1: Characteristics of subjects at baseline. Figure 2 showcases the capillary and isCGM data of the three monitored periods of a single patient. The 24 h post-exercise periods are shadowed to draw attention to the critical parts of each of the stages. Note how the exercise bouts were executed in alternate days, and each day they started at a similar, but not the same, timestamp. Table 2 shows mean values for each selected parameter for the whole cohort of patients evaluated at 6 h, 12 h, and 24 h after finalizing each exercise session. Level 1 hypoglycemia in the six hours after exercise diminished from 12.3% to 10% at the end of the study. However, this tendency seemed to be inversed after 12 h and 24 h. Time-in-range [TIR, 70-180] mg/dL was reduced from baseline to the end of the study, looking at 6 h, 12 h, and 24 h post-exercise (69% to 62.9%, 70.4% to 57.1%, and 67.2% to 63%, respectively). Time-above-range (TaR, >180 mg/dL) 12 h post-exercise seemed to increase from _baseline_ across the study (17.9% to 22.4%, and to 25.7%, from _baseline_, _first_, and _last stage_, respectively), and also for the 24 h post-exercise window (20.8% to 27.5%, and to 22.1%, from _baseline_, _first_, and _last_, respectively), but these differences did not show any statistical significance. Mean isCGM glucose values did not show any clear tendency for any of the selected time windows of the study. However, CV was significantly reduced through the study in the first six hours post-exercise from 48% to 43% and to 42%, from _baseline_, _first_, and _last stage_, respectively. Figure 2: Illustration of the intermittent scanning CGM (isCGM) data from FLS for subject 6. Top row displays the _baseline stage_, middle row shows the _first stage_, and the bottom row the _last stage_. The 24-h post-exercise windows are shaded, and capillary measurements are displayed as red asterisks. Figure 3 shows changes of individual glucose mean values and glucose variability (CV) based on isCGM registries during the 24 h post-exercise observation period. Mean glucose values increased for all patients initially after the first week of exercise, but diminished in most subjects at the end of the study. However, no statistically significant differences in mean glucose values were observed for the full cohort of patients. Table 3 shows differences in CBGs between in relation to exercise session (before, immediately after, and one hour later) by stage. In the _first stage_ (first two weeks after start of the study), CBG decreased immediately after the end of the session by 8.17 mg/dL (95% CI; \(-\)6.80-21.14 mg/dL) and even more shortly thereafter (one hour later, by 21.69 mg/dL (95% CI; 5.09-30.30 mg/dL)). However, although