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11:15
Determining the Contribution of the Energy Systems During Exercise
Published on: March 20, 2012
Oxygen uptake kinetic response to exercise in children
Samantha Fawkner1, Neil Armstrong
1School of Sport and Health Sciences, Children's Health and Exercise Research Centre, University of Exeter, Heavitree Road, Exeter EX1 2LU, UK.
Sports Medicine (Auckland, N.Z.)
|July 9, 2003
Summary
Children show a faster oxygen uptake (.VO2) response during exercise than adults, with a potentially reduced slow component at higher intensities. This review highlights technical challenges in studying pediatric exercise physiology.
Area of Science:
- Exercise Physiology
- Pediatric Cardiopulmonary Function
- Metabolic Response to Exercise
Background:
- Oxygen uptake (.VO2) kinetics reflect integrated cardiovascular and muscle metabolic responses to exercise.
- Exercise intensity domains (moderate, heavy, severe) influence .VO2 kinetics, characterized by phases and a time constant (tau).
- Previous research on .VO2 kinetics primarily used adult data, with early pediatric studies limited by methodology and equipment.
Purpose of the Study:
- To review the literature on .VO2 kinetic response during childhood and adolescence.
- To highlight concerns regarding technical rigor in the determination of pediatric .VO2 kinetics.
- To analyze age and sex differences in .VO2 response during various exercise intensities.
Main Methods:
- Literature analysis of studies investigating .VO2 kinetics in children and adolescents.
- Focus on studies employing mathematical modeling with breath-by-breath analysis.
- Critical evaluation of methodological challenges, including signal-to-noise ratio and domain demarcator accuracy.
Main Results:
- Rigorously determined data show a more rapid .VO2 rise in children compared to adults.
- The slow component of .VO2 may be attenuated in young individuals at intensities above the anaerobic threshold.
- No significant sex differences were found for moderate-intensity exercise; however, differences emerge at higher intensities.
Conclusions:
- Technical limitations in pediatric research can affect the validity of .VO2 kinetic assessments.
- Children exhibit distinct .VO2 kinetic profiles compared to adults, particularly concerning the speed of response and slow component.
- Further rigorous research is needed to fully understand age and sex influences on pediatric exercise .VO2 kinetics.
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