Abstract
Background: Although several equations for predicting VO2max in children and adolescents have been reported, the validity of application of these equations to the Korean population has not been verified. The purpose of study was to develop and validate regression models to estimate maximal oxygen uptake (VO2max) using a newly developed 20 m progressive shuttle test (20 m PST) protocol in Korean male (n = 80, 15.3 ± 1.86 years) and female (n = 81, 15.5 ± 1.73 years) adolescents aged 13–18 years. Methods: The modified 20 m PST was performed and the VO2max was assessed in a sample of 161 participants. The participants underwent a treadmill test (TT) in the laboratory and the modified 20 m PST in a gymnasium. For the validation study, the participants performed the TT with a stationary metabolic cart and the 20 m PST with a portable metabolic cart once. In addition, they performed the 20 m PST two more times to establish test–retest reliability. Results: The mean VO2max (49.6 ± 8.7 mL·kg−1·min−1) measured with the potable metabolic cart was significantly higher than that measured in the graded exercise test with the stationary metabolic cart (46.6 ± 8.9 mL·kg−1·min−1, p < 0.001) using the new 20 m PST protocol. The standard error of the estimate (SEE) between these two measurements was 1.35 mL·kg−1·min−1. However, the VO2max derived from the newly developed equation was 46.7 ± 7.3 mL·kg−1·min−1 (p > 0.05) and the SEE was 2.90 mL·kg−1·min−1. The test and retest trials of the 20 m PST yielded comparable results (laps, r = 0.96; last speed, r = 0.93). Conclusions: Our data suggest that the new 20 m PST protocol is valid and reliable and that the equation developed in this study provides a valid estimate of VO2max in Korean male and female adolescents aged 13–18 years.
Highlights
In the United States, 24.8% of adolescents perform physical activities on more than five days a week, for 60 min or more per day, whereas only 13.1% of Korean adolescents meet these standards [1].In addition, globally, 20% of school-going adolescents aged 11–17 years met the recommended guideline of a minimum daily 60 min of moderate-to-vigorous physical activity (PA)
Our data suggest that the new 20 m PST protocol is valid and reliable and that the equation developed in this study provides a valid estimate of VO2max in Korean male and female adolescents aged 13–18 years
Excluding the test duration (p > 0.05), the modified 20 m PST VO2max (p < 0.01), (p < 0.01), last speed (p < 0.01), and HRmax (p < 0.01) values obtained using the portable gas analyzer were higher than those measured in the graded exercise test (GXT) on a treadmill (Table 3)
Summary
In the United States, 24.8% of adolescents perform physical activities on more than five days a week, for 60 min or more per day, whereas only 13.1% of Korean adolescents meet these standards [1].In addition, globally, 20% of school-going adolescents aged 11–17 years met the recommended guideline of a minimum daily 60 min of moderate-to-vigorous physical activity (PA). One measure to solve this social problem is the development and implementation of nationwide youth fitness and health promotion programs (FITNESSGRAM, European Fans in Training, Trim & Fit program, The New Physical Education) [3]. Several equations for predicting VO2max in children and adolescents have been reported, the validity of application of these equations to the Korean population has not been verified. The participants performed the TT with a stationary metabolic cart and the 20 m PST with a portable metabolic cart once. They performed the 20 m PST two more times to establish test–retest reliability
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