B-63 Thematic Poster - Behavioral Aspects and Correlates of Physical Actvity Wednesday, June 1, 2016, 3: 15 PM - 5: 15 PM Room: 103
High-intensity interval training (HIIT) is well-established as a methodology for improving metabolic health and performance parameters. Research also demonstrates that HIIT is generally well-tolerated in a variety of populations. Less established is the impact of HIIT on intentions to exercise.
PURPOSE: Investigate intentions toward engagement in HIIT exercise among overweight and insufficiently active adults.
METHODS: 48 overweight-to-obese participants (mean BMI = 28, mean VO2 peak = 29 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 secs (INT-60).
RESULTS: Data was analyzed using RM ANOVA and pairwise comparisons. Intention to engage in each trial regularly in the near future was neutral-to-positive (4.9-6.0 on a 1-9 scale) with greater intention to complete INT-30 trials than CONT (p < 0.05; ES = 0.4) or INT-60 (p < 0.05; ES = 0.4) trials. Additional analyses revealed positive intentions to engage in exercise of any kind in the near future (7.2-7.4 on a 1-9 scale) but no difference between trials (p > 0.10).
CONCLUSIONS: Findings indicate that 15-sec and 30-sec HIIT trials produce future intentions to exercise that are equal to or greater than intentions to engage in moderate continuous exercise. These results combined with findings for affective and enjoyment responses to exercise provide justification for the utilization of shorter interval trials as a relatively time-efficient alternative to lower intensity continuous exercise when promotion of intention to exercise is a desired outcome.