%0 Journal Article
%T Short
%A Daniel G da Silva Machado
%A Eduardo C. Costa
%A Hannah Ray
%A Louisa Beale
%A Luiz F de Farias-Junior
%A Nikos L. D. Chatzisarantis
%A Sarah J. Hardcastle
%J Perceptual and Motor Skills
%@ 1558-688X
%D 2019
%R 10.1177/0031512518809734
%X We assessed the short-term effects of varying the volume of high-intensity interval training (HIIT) on psychological and physiological responses of 23 healthy adult males (M£¿=£¿21 years; M peak oxygen uptake [VO2peak]£¿=£¿47.2 ml¡¤kg£¿1¡¤min£¿1). Participants were randomly assigned to low- and very-low-volume HIIT groups and engaged in nine supervised exercise sessions over three weeks. The low-volume HIIT group performed 8-12 60-second work bouts on a cycle ergometer at the peak power output achieved during the incremental test, interspersed by 75 seconds of low-intensity active recovery. The very-low-volume HIIT performed 4-6 work bouts with the same intensity, duration, and rest intervals. During training, participants¡¯ ratings of perceived exertion (Borg Category Ratio-10 scale) and their affective responses (Feeling Scale £¿5/+5) during the last 15 seconds of each work bout were recorded. Physiological data were VO2peak, endurance, and anaerobic performance before and after the intervention. Throughout training, participants in the very-low-volume group (relative to the low-volume group) reported lower ratings of perceived exertion in Week 1 (M£¿=£¿4.1 vs. M£¿=£¿6.3; p£¿<£¿.01) and Week 3 (M£¿=£¿4.0 vs. M£¿=£¿6.2; p£¿<£¿.01), and higher affective response in these same two weeks (Week 1: M£¿=£¿1.9 vs. M£¿=£¿0.3; p£¿=£¿.04; Week 3: M£¿=£¿2.1 vs. M£¿=£¿0.9; p£¿=£¿.06). Regarding physical fitness, Wingate peak power increased significantly after training in the very-low-volume HIIT group (M£¿=£¿1,049 W vs. M£¿=£¿1,222 W; p£¿<£¿.05), but not in the low-volume HIIT group (M£¿=£¿1,050 W vs. M£¿=£¿1,076 W). No significant change was found after training in physiological variables of peak power output, VO2peak, and endurance performance. In summary, in this short-term training period, the very-low-volume HIIT enhanced anaerobic capacity and was perceived as less strenuous and more pleasurable than low-volume HIIT
%K affective responses
%K feeling states
%K interval training
%K perceived exertion
%K aerobic fitness
%K physiological responses
%U https://journals.sagepub.com/doi/full/10.1177/0031512518809734