AIMS: High-intensity interval training (HIIT) leads to improvements in various markers of cardiometabolic health but adherence to HIIT following a supervised laboratory intervention has yet to be tested. We compared self-report and objective measures of physical activity after one month of independent exercise in individuals with prediabetes who were randomized to HIIT (n = 15) or traditional moderate-intensity continuous training (MICT, n = 17). METHOD: After completing 10 sessions of supervised training participants were asked to perform HIIT or MICT three times per week for four weeks. RESULTS: Individuals in HIIT (89 +/- 11%) adhered to their prescribed protocol to a greater extent than individuals in MICT (71 +/- 31%) as determined by training logs completed over one-month follow-up (p = 0.05, Cohen's d = 0.75). Minutes spent in vigorous physical activity per week measured by accelerometer were higher in HIIT (24 +/- 18) as compared to MICT (11 +/- 10) at one-month follow-up (p = 0.049, Cohen's d = 0.92). Cardiorespiratory fitness and systolic blood pressure assessed at one-month follow-up were equally improved (p 's < 0.05). CONCLUSIONS: This study provides preliminary evidence that individuals with prediabetes can adhere to HIIT over the short-term and do so at a level that is greater than MICT.

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