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Comparison of cross-modal omni scale of perceived exertion at ventilatory breakpoint and self-regulated exercises in male adolescents in Singapore
Author
Thor, Dianna
Supervisor
Balasekaran, Govindasamy
Abstract
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 was investigated. A response normalized rating of perceived exertion (RPE) that corresponds to the Vpt in 13- to 17-year-old male adolescents was 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 were 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) was 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) were recorded at the end of each stage of exercise. During E, undifferentiated (RPE-Overall) and differentiated RPE (RPE-Legs, RPE-Chest) were estimated and VO2 and HR were 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 was 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.
Results: Exercise mode effect was not observed for any descriptive or dependent variable. Vpt corresponded to 67.7% VO2peak for the cycling group and 70.4% VO2peak for the walking/running group. RPE-Overall-Vpt (mean cycling, 5.1; mean walking/running, 4.8), RPE-Legs-Vpt (mean cycling, 5.6; mean walking/running, 5.2) and RPE-Chest-Vpt (mean cycling, 4.4; mean walking/running, 5.2) did not differ between the two groups. Response normalized RPE-Overall-Vpt for male adolescents aged 13-17 years was identified at 5. VO2 did not differ between E and P at target RPE of 4 (1.59 versus 1.57 L.min-1) and 6 (1.87 versus 1.79 L.min-1). HR did not differ between E and P at a target RPE of 4 (152.4 versus 151.1 beats.min-1) and 6 (167.1 versus 162.4 beats.min-1). Both VO2 and HR were higher (P < 0.01) at target RPE-6 than -4. Reponses were not affected by exercise mode or production sequence.
Conclusion: Undifferentiated and differentiated RPE-Vpt were similar between cycling and walking/running participants. A comparatively stable RPE-Vpt for 13- to 17-year old male adolescents indicates a group normalized perceptual response at RPE-5. Male adolescents were able to use the OMNI Scale to self-regulate short-duration intermittent cycle and treadmill exercise intensity. The responses support prescription congruence and intensity discrimination of exercise intensity in 13- to 17-year old male adolescents.
Methods: Participants were 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) was 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) were recorded at the end of each stage of exercise. During E, undifferentiated (RPE-Overall) and differentiated RPE (RPE-Legs, RPE-Chest) were estimated and VO2 and HR were 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 was 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.
Results: Exercise mode effect was not observed for any descriptive or dependent variable. Vpt corresponded to 67.7% VO2peak for the cycling group and 70.4% VO2peak for the walking/running group. RPE-Overall-Vpt (mean cycling, 5.1; mean walking/running, 4.8), RPE-Legs-Vpt (mean cycling, 5.6; mean walking/running, 5.2) and RPE-Chest-Vpt (mean cycling, 4.4; mean walking/running, 5.2) did not differ between the two groups. Response normalized RPE-Overall-Vpt for male adolescents aged 13-17 years was identified at 5. VO2 did not differ between E and P at target RPE of 4 (1.59 versus 1.57 L.min-1) and 6 (1.87 versus 1.79 L.min-1). HR did not differ between E and P at a target RPE of 4 (152.4 versus 151.1 beats.min-1) and 6 (167.1 versus 162.4 beats.min-1). Both VO2 and HR were higher (P < 0.01) at target RPE-6 than -4. Reponses were not affected by exercise mode or production sequence.
Conclusion: Undifferentiated and differentiated RPE-Vpt were similar between cycling and walking/running participants. A comparatively stable RPE-Vpt for 13- to 17-year old male adolescents indicates a group normalized perceptual response at RPE-5. Male adolescents were able to use the OMNI Scale to self-regulate short-duration intermittent cycle and treadmill exercise intensity. The responses support prescription congruence and intensity discrimination of exercise intensity in 13- to 17-year old male adolescents.
Date Issued
2012
Call Number
GV436 Tho
Date Submitted
2012