Expected changes in clinical measures of adiposity during puberty

Area of Science:

• Pediatric endocrinology
• Public health
• Cardiovascular disease risk assessment

Background:

• Clinicians use various measures to estimate adiposity, including body mass index (BMI), percent body fat (%BF), waist circumference (WC), and skinfold thickness.
• Abnormal fat accumulation during puberty is linked to an increased risk of cardiovascular disease.
• Understanding normal adiposity changes during puberty is crucial for identifying potential health risks.

Purpose of the Study:

• To characterize the typical patterns of change in key clinical adiposity measures throughout puberty.
• To establish normative data for body mass index (BMI), percent body fat (%BF), waist circumference (WC), and skinfold thickness during pubertal development.

Main Methods:

• Utilized multilevel modeling and linear regression analyses on data from 642 children (ages 8-18) in Project HeartBeat!.
• Collected data on BMI, %BF, WC, and skinfold thickness triennially between 1991 and 1995.
• Assessed pubertal stage (PS) alongside adiposity measures.

Main Results:

• In males, percent body fat (%BF) typically decreases, skinfold thickness remains stable, and waist circumference (WC) increases from PS1 to PS5; however, WC does not change when adjusted for height.
• In females, %BF remains stable, while skinfold thickness increases during puberty.
• Body mass index (BMI) increases in both genders and races, but mean values at PS5 remain below 25 kg/m²; waist-height ratio does not increase, indicating no normal rise in central adiposity.

Conclusions:

• An increase in %BF during puberty is considered abnormal for both females and males, particularly males.
• An increasing waist-height ratio during puberty is abnormal and may indicate an elevated risk for obesity-related health issues.
• These findings highlight the importance of monitoring adiposity trends during puberty to identify individuals at risk for future morbidity.