Psychological and behavioral responses to interval and continuous exercise

Purpose To compare psychological responses to, and preferences for, moderate-intensity continuous training (MICT), high-intensity interval training (HIIT), and sprint interval training (SIT) among inactive adults; and to investigate the relationships between affect, enjoyment, exercise preferences, and subsequent exercise behavior over a 4-wk follow-up period. Methods Thirty inactive men and women (21.23±3.81 y), inexperienced with HIIT or SIT, completed three trials of cycle ergometer exercise in random order on separate days: MICT (45min continuous; ~70-75% of heart rate maximum (HRmax)); HIIT (10x1 min bouts at ~85-90%HRmax with 1-min recovery periods); and SIT (3x20-s "all-out" sprints with 2-min recovery periods). Perceived exertion (RPE), affect, and arousal were measured throughout the trials and enjoyment was measured post-exercise. Participants rank-ordered the protocols (#1-3) according to preference and logged their exercise over a 4-week follow-up. Results Despite elevated HR, RPE, and arousal during work periods (ps0.05). In-task affect was predictive of post-exercise enjoyment for each type of exercise (rs=0.32 to 0.47; ps0.05), respectively. Over the follow-up, participants completed more MICT (M=6.11±4.12) than SIT sessions (M=1.39±1.85; p0.05). Conclusion This study provides new evidence that a single session of HIIT and SIT can be as enjoyable and preferable as MICT among inactive individuals and that there may be differences in the exercise affect-behavior relationship between interval and continuous exercise. Corresponding author: Matthew Stork, School of Health and Exercise Sciences, University of British Columbia; Address: 3333 University Way, Kelowna, BC, Canada, V1V 1V7; Phone: 647-200-1410; Email: matthew.stork@ubc.ca The authors would like to thank the North American Society for the Psychology of Sport and Physical Activity for funding this project. We would also like to acknowledge the Social Sciences and Humanities Council for its support through a Joseph-Armand Bombardier Doctoral Canada Graduate Scholarship to Matthew J. Stork, which aided preparation of this manuscript. Conflict of Interest: None to declare. The results of the study do not constitute endorsement by ACSM and are presented clearly, honestly, and without fabrication, falsification, or inappropriate data manipulation. Accepted for Publication: 8 May 2018 © 2018 American College of Sports Medicine

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