Background and Aims

Exercising using high intensity interval training (HIIT) may help in improving glycemic control in diabetes. Although high workload volume HIIT may have increased health benefits, an adequate workload progression should be programmed when initiating HIIT. Our objective was to examine the effect on home capillary blood glucose monitoring (HCGM) of an exercise program of increasing volume in people with type 1 diabetes.

Methods

Exercising using high intensity interval training (HIIT) may help in improving glycemic control in diabetes. Although high workload volume HIIT may have increased health benefits, an adequate workload progression should be programmed when initiating HIIT. Our objective was to examine the effect on HCGM of an exercise program of increasing volume in people with type 1 diabetes.

Results

For all periods, there was a reduction of 1-h post-exercise HCGM compared with basal values before beginning each session. In addition, from the first period (one exercise series) through the third period (three series), a sudden drop of HCGM was observed between beginning and end of sessions but less between immediately and 1-h post-exercise.

Conclusions

Increasing progressively exercise workload volume with HIIT over 12 weeks decreased slightly and progressively HBGM just after exercise but not 1-h post-exercise in people with type 1 diabetes.

Funding: Spanish Gov. DPI2016-78831-C2-1-R, FEDER funds, UPV PAID-06-18

Background and Aims

The impact of different types of exercise on glucose homeostasis in people with type 1 diabetes still remains to be quantified. High Intensity Interval Training (HIIT) is often recommended as an effective and safe physical exercise for people with diabetes. The aim of this analysis was to evaluate the impact of HIIT on the nighttime glucose profiles in people with type 1 diabetes.

Methods

Six males (36.7±6.1 years-old; BMI 25.1±1.8 kg/m²) performed three HIIT weekly sessions using elastic bands for 12 weeks, with 48h rest in-between. Continuous glucose were recorded using a FreeStyle Libre® (FSL, Abbott, CA, USA) two-weeks before study initiation (baseline), on the first two-weeks of HIIT (First period), and on the last two-weeks (Last period). Glucose control was evaluated for <54 mg/dL, 54–70 mg/dL, 70–180 mg/dL, 80–140 mg/dL, 180–250 mg/dL and >250 mg/dL ranges, plus the mean glucose value overnight and the coefficient of variability (CV). The evaluated nighttime period was considered from midnight to 07:00 AM after each exercise session.

Results

No significant reduction was observed in time-in-range (in both ranges 70–180 or 80–140 mg/dL) between baseline, first and last periods. Similarly, time-in-hypoglycemia (<54 mg/dL and 54-70 mg/dL) showed also no significant changes after HIIT.

Conclusions

Our HIIT exercise program was proven to be safe for people with type 1 diabetes. No significance differences were observed in the time-in-range and other glycemic metrics, probably to small number of patients evaluated.

Funding: Spanish Gov. DPI2016-78831-C2-1-R, FEDER funds, UPV PAID-06-18