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Marginal malnutrition in school-aged Colombian boys: functional consequences in maximum exercise
Insights
Marginal malnutrition in children, particularly those in lower socioeconomic groups, significantly reduces aerobic capacity (maximum treadmill oxygen consumption). This diminished physical capacity may negatively impact their future work productivity in adulthood.
Area of Science:
- Pediatric Nutrition
- Exercise Physiology
- Public Health
Background:
- Childhood malnutrition remains a significant global health concern, particularly in lower socioeconomic populations.
- Nutritional status during growth is critical for developing optimal physical work capacity.
- Understanding the long-term effects of marginal malnutrition on aerobic fitness is essential for public health interventions.
Purpose of the Study:
- To investigate the impact of nutritional status and socioeconomic factors on maximal aerobic capacity in children.
- To assess the relationship between marginal malnutrition and maximal treadmill oxygen consumption in boys aged 6-16.
- To explore potential long-term consequences of impaired aerobic capacity on adult work productivity.
Main Methods:
- Maximal treadmill oxygen consumption (VO2 max) was measured in 1013 boys aged 6-16 years.
- Participants were categorized by nutritional status (normal, low weight for age, low weight for height) and socioeconomic group (upper urban, lower urban, rural).
- Statistical analyses were performed to compare aerobic capacity across different groups and to examine correlations with body weight and hemoglobin levels.
Main Results:
- Boys with marginal malnutrition (low weight for age and height) in lower socioeconomic urban and rural groups exhibited significantly reduced maximal treadmill oxygen consumption (85% of normal).
- Reduced aerobic capacity was associated with smaller body weights in malnourished children.
- No statistically significant correlation was found between blood hemoglobin concentration (10-15 g/dL) and aerobic capacity.
Conclusions:
- Marginal malnutrition during childhood, especially in disadvantaged populations, detrimentally affects aerobic capacity.
- Reduced maximal oxygen consumption in childhood may lead to decreased work capacity and productivity in adulthood, particularly in physically demanding occupations.
- Public health strategies should address childhood malnutrition to improve long-term physical capabilities and economic potential.
Abstract:
The maximum treadmill oxygen consumption was measured in 1013 boys, 6 to 16 yr of age classified as nutritionally normal, low weight for age and low weight for height in upper socioeconomic urban and lower socioeconomic urban and rural groups. The marginally malnourished children (low weight for age and height) in both lower socioeconomic urban and rural groups had significantly depressed maximum treadmill oxygen consumption (85%) compared to normal boys, associated with smaller body weights. It is suggested that the reduced body size and maximum treadmill oxygen consumption resulting from marginal malnutrition during growth will have a detrimental effect on work capacity and productivity of these children when they become engaged in heavy physical work as adults. There was no statistically significant correlation between blood Hb concentration (approximately 10 to 15 g x dl-1) and aerobic capacity.