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Purpose To determine the validity and test–retest reliability of using ratings of perceived exertion (RPE) elicited during a submaximal 20-m Shuttle Run Test (20mSRT) to predict VO2peak in children and investigate acute affective responses. Methods Twenty-five children (14 boys; age, 12.8 ± 0.7 years; height, 162.0 ± 9.3 cm; mass, 49.9 ± 7.7 kg) completed four exercise tests (GXT, 2 submaximal 20mSRT, maximal 20mSRT). The Eston–Parfitt RPE scale was used, and affect was measured with the Feeling Scale. Submaximal 20mSRT were terminated upon participants reporting RPE7. The speed-RPE relationship from the submaximal 20mSRTs was extrapolated to RPE9 and 10 to predict peak speed and then used to estimate VO2peak. Results Repeated measures ANOVA to examine the validity of using submaximal RPE to predict VO2peak resulted in a Gender main effect (boys = 46.7 ± 5.1 mL kg−1 min−1; girls = 42.0 ± 5.1 mL kg−1 min−1) and Method main effect (p 2peak from the maximal 20mSRT, but not between measured and estimated VO2peak at RPE9 and RPE10. Intraclass correlation analysis revealed excellent reliability (~ 0.9) between the two submaximal 20mSRTs. Significant differences (p Conclusions The results of this study provide evidence that RPE reported during a submaximal 20mSRT can be used to predict VO2peak accurately and reliably. In this study, the submaximal 20mSRT ending at RPE7, provided better predictions of VO2peak while minimising aversive end-point affect, especially in girls.

Thesis (Masters by research(Health Sciences))--University of South Australia, 2020. Includes bibliographical references. Cardiorespiratory fitness (CRF) during childhood is a predictor of future health. The 20-metre shuttle run test (20mSRT) is commonly used to assess CRF. However, the 20mSRT may induce unpleasant feelings (i.e. negative affect), which predicts future physical activity. Using Ratings of Perceived Exertion (RPE) to predict CRF is a valid method in adults and children. However, the use of RPE in children has been less explored. Study 1 maps the use of RPE in children during aerobic exercise. In children, RPE has been used to predict CRF, monitor training load, and guide exercise intensity. However, due to limited research, the use of RPE in children remains unclear. Study 2 examines the utility of RPE to predict VO2peak from a submaximal 20mSRT while exploring affective response. The study shows RPE can be used to predict VO2peak during a submaximal 20mSRT, while minimising negative affect.