Estimated basal metabolic rate and maintenance fluid volume in children: A proposal for a new equation

Area of Science:

• Pediatrics
• Metabolic Research
• Clinical Nutrition

Background:

• Basal metabolic rate (BMR) in children under two years correlates with body weight.
• No simple model exists for estimating BMR in children aged two years and older.
• Previous BMR equations (Schofield, Oxford) are proportional to body weight to the power of 1/2 (W^1/2).

Purpose of the Study:

• To propose a new, simple mathematical model for estimating maintenance fluid volume in hospitalized children aged two years and older.
• To validate the proposed equation against established methods.

Main Methods:

• Analysis of Japanese childhood BMR studies conducted until the 1960s.
• Mathematical modeling based on the observation that BMR in children (post-infancy) is proportional to W^1/2.
• Comparison of the proposed equation (300 × W^1/2 mL/day) with the Holliday and Segar equation.

Main Results:

• Childhood BMR (post-infancy) was found to be proportional to body weight to the power of 1/2 (W^1/2).
• The new equation for maintenance fluid volume (300 × W^1/2 mL/day) yields results comparable to the Holliday and Segar equation for children aged 2-18 years.
• The proposed equation simplifies fluid volume calculation for pediatricians.

Conclusions:

• A novel, simplified equation (300 × W^1/2 mL/day) accurately estimates maintenance fluid volume in hospitalized children aged 2-18 years.
• This new model provides a practical tool for pediatricians in daily clinical practice.
• The findings support the use of W^1/2 proportionality for BMR and fluid volume estimations in older children.