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The effect of high‐intensity interval exercise (HIIE) on affective responses is unclear due to the several variables of HIIE, which may be minimized by using derived variables (e.g. amplitude). The amplitude reflects the difference between stimulus and recovery intensities, being more representative of the physiological changes than central tendency variables such as average intensity. This study aimed to compare the affective responses in HIIE sessions in different amplitudes with a vigorous‐intensity continuous exercise (VICE) session. Eleven participants completed five sessions. The peak oxygen consumption (VO 2Peak ) and peak power (W peak ) were measured. Participants performed one VICE and three HIIE sessions (10x[1min‐90%W Peak /1min‐50%W Peak ]; 10x[1min‐100%W Peak /1min‐40%W Peak ]; and 10x[1min‐110%W Peak /1min‐40%W Peak ]). The exercise sessions were performed at the same average intensity (70%W Peak ) and duration (20 min). The Feeling Scale (FS) was applied in each minute throughout the exercise sessions. Regarding the FS responses, a two‐way repeated‐measures ANOVA showed no significant interaction for FS ( P =0.093) or main effect for condition ( P =0.206) and time ( P =0.078), indicating that irrespective of the amplitude of the HIIE, FS results were similar between conditions. The effect size (ES) analysis showed a small effect in favour of HIIE‐90/50 (ES=0.30) and HIIE‐100/40 (ES=0.26) and a null effect on HIIE‐110/30 (ES=0.08) when compared to VICE. Chi‐squared analysis showed no significant differences between conditions in the number of participants that reduced, maintained, or increased the FS from pre‐exercise to last stimulus and recovery indicating a high variability of the affective responses. HIIE sessions provide similar affective responses when performed at the same average intensity, even with different amplitudes.   HighlightsHIIE amplitude reflects the difference between stimulus and recovery intensities and seems not to modulate the affective responses to HIIE sessions configured with different amplitudes.  HIIE sessions performed at the same average intensity and different amplitudes result in similar affective responses.  High inter‐individual variability of affective responses occurs in HIIE sessions configured based on the amplitude.

Acute affective responses to high‐intensity interval exercise: Implications on the use of different stimulus‐recovery amplitudes