Previous research has shown an inverse relationship between age and the relative intensity at which ventilatory threshold (VT) occurs in adolescent boys. However, no study has examined the effect of maturity status on VT in the differences in boys from the onset of puberty, adolescents. The purpose of this study was to compare VT among adolescent boys of different maturational groups. Methods: For this study, moderately active adolescent male participants (14 ± 3 y) completed this study. Maturational status of the participants was determined via years from peak height velocity (PHV), which is an estimation of somatic maturity status derived from age, standing height, seated height, body mass, and leg length. Participants were categorized into PRE- (lesser than 1 year till PHV), PERI- (within 1 year of PHV), and POST-PHV (greater than 1 year past PHV). All participants completed a ramp graded exercise test on a cycle ergometer. During the test, participants were given a three-minute warm-up with no resistance before starting at a workload of 30 watts which increased at a rate of 1 watt every 3 seconds until volitional fatigue. Throughout the test, oxygen consumption (VO2) and ventilation were measured. VT was determined, as a percentage of VO2max, from the ventilation versus VO2 graph using the maximal deviation method. Differences in VT between maturational groups were examined using one-way ANOVA. Results: A significant (F=5.36; p=0.014) difference in VT among maturational groups was found (Appendix A, Figure 2). Post hoc analysis revealed that PRE (p=0.029) and PERI (p=0.009) had VT occur at a significantly greater relative percentage of VO2max than POST. However, no significant (p=0.970) differences were found between PRE and PERI (Appendix A, Figure 3). Conclusion: Adolescent males in PRE and PERI demonstrated higher VT as a percentage of their VO2max compared to POST. This finding suggests the differences in the delayed switch from aerobic to anaerobic metabolism during incremental exercise in adolescent boys who are PRE and PERI.
Stout, Jeffery R.
Bachelor of Science (B.S.)
College of Education and Human Performance
Educational and Human Sciences
Sport and Exercise Science
Orlando (Main) Campus
Loney, Dyane, "The Difference in Ventilatory Threshold Among Adolescent Males Based on Maturity Status" (2016). Honors in the Major Theses. 145.