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A critique of the expression of paediatric body composition data
1Childhood Nutrition Research Centre, Institute of Child Health, 30 Guilford Street, London WC1N 1EH, UK.
Insights
Accurate pediatric body composition analysis requires normalizing fatness and fat-free mass for height. This method improves quantitative assessment beyond traditional measures for better disease and obesity research.
Area of Science:
- Pediatric research
- Body composition analysis
- Nutritional status assessment
Background:
- Growing interest in pediatric body composition beyond general growth and nutritional status.
- Existing methods (e.g., BMI, skinfold thickness) lack quantitative accuracy for fat and lean mass.
- Current body composition data often uses inappropriate expression methods (e.g., percentage of weight for fatness).
Purpose of the Study:
- To propose a more appropriate method for expressing pediatric body composition data.
- To enable accurate quantitative assessment of fat mass and fat-free mass in children.
- To provide a standardized approach for comparing pediatric body composition data.
Main Methods:
- Critique of traditional anthropometric measurements for body composition.
- Review of existing techniques for dividing body weight into fat mass and fat-free mass.
- Recommendation for height normalization of both fatness and fat-free mass.
Main Results:
- Traditional methods like BMI and skinfold thickness are insufficient for precise body composition evaluation.
- Current expression of body fatness (percentage of weight) and fat-free mass (unadjusted for size) is suboptimal.
- Height normalization offers a more accurate and comparable method for assessing pediatric body composition.
Conclusions:
- Normalizing both body fatness and fat-free mass for height is recommended for pediatric research.
- This approach enhances the accuracy of body composition assessment in children.
- The proposed method is suitable for comparative studies, reference data development, and childhood obesity classification.
Abstract:
There is increasing interest in body composition in paediatric research, as distinct from growth and nutritional status, as almost all diseases have adverse effects on either fatness or the fat-free mass. However, the approaches used to assess growth and nutritional status are not appropriate for separate evaluations of body fatness and lean mass. Traditional measurements such as body mass index and skinfold thickness do not measure fat in accurate quantitative terms. Various techniques have been used in recent years which divide body weight into fat mass and fat-free mass; however, the data tend not to be appropriately expressed. Body fatness is generally expressed as a percentage of weight, while fat-free mass typically remains unadjusted for size. A more appropriate approach is to normalise both body fatness and fat-free mass for height. This recommendation is relevant both to studies comparing patients with controls and to the expression of new reference data on body composition which are needed to allow informative comparisons. The same approach is appropriate for the classification of childhood obesity.