Comparison of Cross-Modal OMNI Scale of Perceived Exertion at Ventilatory Breakpoint and Self-Regulated Exercises in

Project Number
RI 9/13 GB

Project Duration
September 2014 - September 2016


Purpose: In this study, a comparison of ratings of perceived exertion (RPE) [undifferentiated (RPE-overall) and differentiated (RPE-Legs, and RPE-Chest)] that correspond to the ventilatory breakpoint (Vpt) between different exercise modes (cycling and walking/running) using the Children’s OMNI Scale of Perceived Exertion will be investigated. A response normalized rating of perceived exertion (RPE) that corresponds to the Vpt in 13- to 17-year-old male adolescents will be identified. An estimation production paradigm was used to determine whether the adolescents could self-regulate intensity on a cycle ergometer and treadmill exercise using a prescribed target RPE, discriminate between target RPEs and produce intermittent RPEs in both ascending and descending sequence. Methods: Participants will be randomly assigned into cycling and walking/running groups and underwent one orientation trial (O), one estimation trial (E) and two production trials (P). During O, each participant’s peak oxygen uptake (VO2peak) will be determined using a progressive multi-stage cycle ergometer protocol for cycling participants and a modified Astrand treadmill protocol for walking/running participants. Oxygen uptake (VO2) and heart rate (HR) will be recorded at the end of each stage of exercise. During E, undifferentiated (RPE-Overall) and differentiated RPE (RPE-Legs, RPE-Chest) will b estimated and VO2 and HR will be taken at every stage of a progressive cycle ergometer or treadmill test. Participants performed the exercise trials in O and E to volitional exhaustion. Significance for all statistical analysis will be set at P < 0.05, unless otherwise stated. During P, participants adjusted the brake force on the cycle ergometer or speed on the treadmill to produce either an RPE sequence of 4 and 6 (ascending) or 6 and 4 (descending) in the 8-minute intermittent production trials. The results of this study will identify a comparatively stable group normalized perceptual response at RPE-Vpt for 13- to 17- year old male adolescents. In addition the results will indicate whether male adolescents will able to use the OMNI Scale to self-regulate short-duration intermittent cycle and treadmill exercise intensity. The responses will support prescription congruence and intensity discrimination of exercise intensity in 13- to 17-year old male adolescents. Data relating to self-regulation of exercise intensity at closer RPE values would be useful since to date, no known local research in this area has been done. Such data will also help students in Singapore schools to have the appropriate intensity during physical activities to prevent injuries and burnout.

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