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Exertional Responses To High-intensity Interval Training In Overweight Adults: 2266 May 30, 1030 AM - 1045 AM

Kilpatrick, Marcus W.; Martinez, Nicholas

Medicine & Science in Sports & Exercise: May 2014 - Volume 46 - Issue 5S - p 600
doi: 10.1249/01.mss.0000495272.21843.c6
E-20 Free Communication/Slide - Perception: RPE Friday, May 30, 2014, 9:30 AM - 11:30 AM Room:308 A

University of South Florida, Tampa, FL. (Sponsor: Robert Kraemer, FACSM)

(No relationships reported)

Rating of perceived exertion (RPE) is increasingly being considered as a viable tool for predicting impending exertion and reflecting on recently completed sessions of exercise, in addition to its role in assessing in-task effort. Limited research indicates that these predicted, momentary, and session RPE values are often notably different from each other. An important new consideration is how these perceptions are impacted by high-intensity interval training (HIIT).

PURPOSE: Compare the RPE responses obtained before, during, and after exercise within interval trials that vary on sprint duration and a standard continuous trial.

METHODS: Twenty (11 female, 9 male; age = 22 years), overweight (BMI = 29), and sedentary (capacity = 8 METs) participants completed a maximal cycle ergometer test, a 20-minute continuous trial just above the ventilatory threshold (VT-Cont), and three 24-minute interval trials that utilized 1:1 work-to-recovery ratios: 30 seconds (HIIT-30), 60 seconds (HIIT-60), and 120 seconds (HIIT-120). Exertion was assessed before, during, and after exercise using the Borg CR10 scale. All trials were matched for total work.

RESULTS: Data were analyzed using RM ANOVA and pairwise comparisons. Predicted exertion was higher in the HIIT-120 trial (5.8 ± 2.0; p < 0.05) than all other trials. Exertion increased from beginning to end in all trials (p < 0.05; ES = 0.9), with greatest increases occurring within the VT-Cont trial (2.9 ± 0.8 to 5.9 ± 1.7; ES > 2.0). Post-exercise session RPE for the HIIT-120 trial (6.4 ± 2.3) was higher than all other trials (p < 0.05) and the HIIT-30 trial (3.7 ± 1.8) was lower than the VT-Cont trial (4.9 ± 1.6; p <0.05).

CONCLUSIONS: These findings suggest that HIIT protocols limit the perceptual drift that occurs during exercise in comparison to heavy continuous exercise. These results also imply that HIIT sessions with longer durations tend to produce the highest in-task RPE. Moreover, these findings indicate that HIIT protocols with shorter durations produce lower post-exercise RPE values than longer duration trials in the presence of controlled total work. Interval training is increasingly popular and this research provides some new insights into how such sessions are perceived by overweight, sedentary participants.

© 2014 American College of Sports Medicine