D-67 Free Communication/Slide - Physical Activity and Mental Health Thursday, May 28, 2015, 3: 15 PM - 4: 45 PM Room: 26B
Physiological benefits of high-intensity interval training (HIIT) are well-established and indicate great potency for cardiometabolic effects. Research is now establishing that HIIT is more pleasurable than relatively intense continuous exercise, while investigations comparing HIIT to lower intensity continuous exercise is less available.
PURPOSE: Investigate the affective and enjoyment responses to continuous and interval exercise in overweight and insufficiently active adults.
METHODS: 16 overweight-to-obese participants (9 female, 7 male; mean BMI = 28, mean VO2 peak = 34 ml/kg/min) completed four counterbalanced trials comprised of a 30-minute continuous trial at 33% peak power (CONT) and three 20-minute interval trials that alternated between 85% and 15% peak power using 1:1 work-to-recovery ratios: 15 secs (INT-15), 30 secs (INT-30), and 60 seconds (INT-60).
RESULTS: Data was analyzed using RM ANOVA and pairwise comparisons. Affect declined during the INT-60 trial (p < 0.01; 1.7 ± 1.7 to 0.6 ± 1.8; ES = 0.6) but was preserved during all other trials (p > 0.05; ES < 0.3). Similarly, enjoyment declined during the INT-60 trial (p < 0.05; 3.3 ± 1.1 to 2.8 ± 1.4; ES = 0.4) but was preserved during all other trials (p > 0.05; ES < 0.2). Comparison across trials near the end of exercise indicated that affect was lower in the INT-60 trial than all other trials (p < 0.05) and that enjoyment was lower in the INT-60 trial than INT-30 and INT-15 trials (p < 0.05).
CONCLUSIONS: Findings indicate that HIIT trials composed of relatively short interval segments produce more positive affect and enjoyment than longer interval trials and responses that are more like those observed during longer continuous trials performed at low-to-moderate intensities. These results provide justification for the utilization of shorter interval trials as a relatively time-efficient alternative to lower intensity continuous exercise when maintenance of positive psychological states is a desired outcome.