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Arm fat and muscle areas in infancy
Insights
This study tracked infant arm growth, finding that arm fat area peaked at six months while muscle area grew steadily. These measurements can help assess an infant
Area of Science:
- Pediatric Nutrition
- Body Composition Analysis
- Infant Growth Monitoring
Background:
- Assessing infant nutritional status is crucial for healthy development.
- Longitudinal body composition data in infants is limited.
- Arm measurements offer a non-invasive method for growth evaluation.
Purpose of the Study:
- To longitudinally evaluate the growth of arm muscle, fat, and water areas in infants.
- To establish reference percentiles for infant upper arm fat and muscle areas.
- To determine the utility of these measurements as indicators of nutritional status.
Main Methods:
- Prospective study involving 81 infants from birth to 12 months.
- Longitudinal measurements of arm muscle, fat, and water areas.
- Utilized mid-arm circumference and triceps skinfold measurements.
Main Results:
- Arm fat area increased from 15 days, peaking at 6 months.
- Arm muscle area showed progressive growth throughout the first year.
- Arm water area constituted a minimal percentage (1%) of total arm area.
- Calculations for arm fat and muscle areas are feasible using simple measurements.
Conclusions:
- Upper arm fat and muscle areas provide valuable indices for assessing infant nutritional status.
- Established percentiles can serve as a reference for monitoring infant growth.
- Simple anthropometric measurements are effective for estimating key body composition parameters in infants.
Abstract:
Growth of arm muscle, fat and water areas were evaluated longitudinally in a prospective study in 81 infants from birth to the age of 12 months. The percentage of arm fat area v the cross sectional upper arm area increased at the age of 15 days with a peak peak at the age of 6 months while arm muscle area increased progressively throughout the year. As arm water area represented only 1% of cross sectional upper arm area, calculations of arm fat and muscle areas can be carried out from measurements of mid arm circumference and tricipital skinfold at 15 seconds. Percentiles are presented for the upper arm fat and muscle areas, which can be used as index for the infants' nutritional state.