It is mostly after long bike training sessions with higher intensity efforts, running with higher intensity intervals or swim sessions with hard efforts that glucose levels tend to rise in the hours after exercise.
I established that if any of the below factors are present, levels will go up:
- More than 2.5-3 hours of bike training with reduced basal rate and with higher intensity efforts in between
- Running or swimming at higher intensity for more than 30 min or tempo/hard intervals
- A race
I found that rising blood sugar levels even occur with perfect starting and finishing glucose levels: I aim to start training with a level of 150-180 (8.3- 10 mmol/l) and finish between 70-100 mg/dl (3.9 -5.5 mmol/l).