Date of Award

Spring 5-8-2020

Document Type


Degree Name

Bachelor of Science (BS)




College of Science

First Advisor

Justin Guilkey


Previously, we found that variable-intensity exercise (VIIE) was more enjoyable than high-intensity interval exercise (HIIT), but the physiological stress was reduced. This study will examine exercise intensity, energy expenditure (EE), and perceptual responses during and after moderate-intensity exercise (MIE), HIIT, and VIIE. On separate days, the three work-matched bouts of exercise (MIE, HIIT, & VIIE) were randomized and performed. Oxygen consumption, heart rate (HR), and muscle oxygenation were collected over the entire bout for all conditions. OMNI ratings of perceived exertion (RPE) and affect, via Feelings Scale, were measured in-exercise and enjoyment was measured post-exercise using the physical activity enjoyment scale. The high and varied intensity of VIIE may elicit a similar or higher EE and be perceived as more enjoyable and improve affect compared to HIIT and MIE. The similar or greater responses to VIIE may present as a new alternative exercise format and increase adherence to training.