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Evolution of maximal oxygen uptake in children
1Baystate Medical Center, Springfield, Mass., USA.
Physiologic aerobic fitness, measured by maximal oxygen uptake per kilogram (VO2max x kg-1), is crucial for health. Declining VO2max x kg-1 in youth is anticipated due to rising childhood obesity, not cardiovascular decline.
Area of Science:
- Pediatric Exercise Physiology
- Public Health Trends
- Cardiovascular Health in Youth
Background:
- Physiologic aerobic fitness (VO2max x kg-1) impacts child and adult health.
- Understanding trends in youth aerobic fitness is vital for assessing socio-cultural influences.
- Current data lacks population-based insights into secular trends of VO2max x kg-1 in young individuals.
Purpose of the Study:
- To anticipate secular trends in maximal oxygen uptake per kilogram (VO2max x kg-1) among youth.
- To investigate potential factors contributing to changes in youth aerobic fitness over time.
Main Methods:
- This study is a conceptual review and projection based on existing data.
- Analysis of documented temporal changes in childhood obesity prevalence.
- Evaluation of trends in physical activity levels among youth.
Main Results:
- A decline in VO2max x kg-1 over time is anticipated for the pediatric population.
- The anticipated decline is primarily attributed to increased body fat in youth.
- This rise in body fat likely inflates the normalizing factor (per kg), rather than indicating a decline in intrinsic cardiovascular function.
Conclusions:
- Secular trends indicate a probable decrease in youth aerobic fitness (VO2max x kg-1).
- Increased adiposity in children is the likely driver of this decline.
- Public health strategies should address childhood obesity to improve aerobic fitness.
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