To describe and compare the acute heart rate changes during an incremental exercise test and high-intensity interval training (HIIT) in subjects of different glucose control. Seventy-five adults were allocated into three groups: Normoglycaemic (NG, 32), Pre- (PreT2D, 30) and Type 2 diabetic (T2D, 13) subjects. Subjects performed an incremental cycling test to determine cardiorespiratory fitness (VOmax), maximum heart rate (HRmax) and HR recovery post maximal effort, as well as a HIIT cycling session. HR variations are reported as HR pre (HR-pre), and post interval (HR-post), percentage of maximum HR (%HRmax), delta of HR increased (∆HR), and delta HR recovery after each interval (∆HRR). By groups, there was a significant difference for the %HRmax in 1 and 2, but not in intervals 3 to 10 between Pre-T2D and T2D groups. There were significant differences for the %HRmax in 1 to 2 intervals between Pre-T2D and T2D groups. Significant (0.05) differences at some intervals were found for ΔHR, and ΔHRR. These findings suggest that the HR during an incremental exercise test, and from a typical 10-intervals based HIIT protocol could be used as an intensity marker for individuals independent of their glycaemic control.
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