The Impact of Continuous and Discontinuous Cycle Exercise on Affect: An Examination of the Dual-Mode Model

Low-volume, high-intensity interval training has been garnering attention in the exercise physiology literature recently due to its proposed time-efficiency. Also, recent work comparing continuous exercise to high-intensity interval training demonstrated superior ratings of perceived enjoyment following interval training. However, the dual-mode model suggests that exercise above ventilatory threshold (VT) done continuously will result in an almost homogenous decline in affect, which may reduce adherence. Numerous studies confirm the dual-mode model\u27s prediction of reduced affect when exercising above VT, but no research to date has applied the model\u27s predictions to interval training. The purpose of this study was to examine the dual-mode model using interval training. Based on the model, interval exercise above VT should produce a homogenous and significant decline in affect during exercise. Ten participants (mean age = 21.6 ± 2.4 yrs) completed the study. Participants were screened by a physician\u27s assistant on their first visit to ensure they were low-risk and had no symptoms (cardiovascular, pulmonary, metabolic, or orthopedic) that would preclude safe participation in an exercise training program. Participants performed a maximal exercise test during their second visit to the lab. The final four visits were exercise trials 20 minutes in duration: 1) continuous at 20% below VT [Continuous-Moderate], 2) continuous at VT [Continuous-Heavy, 3) 10 x 60-second intervals at VT [Interval-Heavy], 4) 10 x 60-second intervals at 20% above VT [Interval-Severe]. Results indicated that enjoyment and affect was significantly greater during Continuous-Moderate and Interval-Heavy compared with Continuous-Heavy. Interval-Severe approached inducing significantly greater enjoyment and affect compared with Continuous-Heavy, however the study was likely underpowered to achieve significance. The findings of this study suggest that utilizing interval training may help preserve affect, even when performing exercise above VT