Key result
Endurance-trained youth and adult cyclists showed no significant difference in the phase II oxygen uptake time constant during moderate and heavy-intensity exercise.
Why the study?
While untrained youth show faster pulmonary oxygen uptake kinetics at exercise onset than adults, whether these differences persist in trained individuals had not been examined.
Does age and training history affect pulmonary oxygen uptake kinetics during moderate and heavy-intensity exercise in trained cyclists?
Cross-Sectional (n=26)
No
Does age and training history affect pulmonary oxygen uptake kinetics during moderate and heavy-intensity exercise in trained cyclists?
In endurance-trained cyclists, the primary response of oxygen uptake kinetics is similar between youth and adults, suggesting that long-term training adaptations in adults compensate for the typically faster response seen in untrained youth.
Training may equalize oxygen uptake kinetics across ages in cyclists; hypothesis-generating for broader populations and longitudinal studies.
Previous studies reported faster pulmonary oxygen uptake kinetics at the onset of exercise in untrained youth compared with adults. Whether or not these differences are identical for trained groups have not been examined. The purpose of this study was to compare ̇VO2 kinetics of youth and adult cyclists at moderate and heavy-intensity exercise. Thirteen adult (age: 23.2 ± 4.8 years; ̇VO2peak 68.4 ± 6.8 mL·min-1.kg-1) and thirteen youth cyclists (age: 14.3 ± 1.5 years; ̇VO2peak 61.7 ± 4.3 mL·min-1.kg-1) completed a series of 6-min square wave exercises at moderate and heavy-intensity exercise at 90 rev·min-1. A two-way repeated-measure ANOVA was conducted to identify differences between groups and intensities. The time constant, time delay and the mean response time were not significantly different between youth and adult cyclists (p > 0.05). We found significant differences between intensities, with a faster time constant during moderate than heavy-intensity exercise in youth (24.1 ± 7.0 s vs. 31.8 ± 5.6 s; p = 0.004) and adults (22.7 ± 5.6 s vs. 28.6 ± 5.7 s; p < 0.001). The present data suggest that the effect of training history in adult cyclists compensate for the superior primary response of the oxygen uptake kinetics typically seen in youth compared to adults. Furthermore, the ̇VO2 response is dependent of work rate intensity in trained youth and adult cyclists.
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Prinz et al. (2021) conducted a cross-sectional in Healthy endurance-trained cyclists (n=26). Youth age group vs. Adult cyclists was evaluated on Phase II V̇O2 time constant (τ) (p=0.263). Endurance-trained youth and adult cyclists showed no significant difference in the phase II oxygen uptake time constant during moderate and heavy-intensity exercise.
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