EFFECTS OF FOOD AND DRINK INGESTION ON BODY COMPOSITION VARIABLES OF ABDOMINAL BIOELECTRICAL IMPEDANCE

Area of Science:

• Gerontology
• Human Physiology
• Body Composition Analysis

Background:

• Accurate body composition assessment is crucial for understanding metabolic health in aging populations.
• Central adiposity is a key indicator of metabolic risk.
• The influence of postprandial state on abdominal fat measurements requires clarification.

Purpose of the Study:

• To evaluate changes in trunk fat and visceral fat using abdominal bioelectrical impedance (BIA) after a meal.
• To assess alterations in anthropometric measures related to abdominal fat postprandially.
• To determine the reliability of BIA for body composition in non-fasting states.

Main Methods:

• A descriptive, longitudinal intervention study was conducted.
• 21 elderly participants (mean age 74 years) underwent measurements before and after lunch.
• Measures included maximal waist circumference, supine waist circumference, sagittal abdominal diameter (SAD), and trunk/visceral fat by abdominal BIA.

Main Results:

• Maximal waist circumference in standing position significantly increased post-meal (P < 0.05).
• Supine waist circumference and SAD showed no significant changes (P > 0.05).
• Trunk fat and visceral fat ratio by BIA remained unchanged (P > 0.05), with percentage changes under 2% for most measures.

Conclusions:

• Postprandial ingestion of food and drink has minimal effects on trunk and visceral fat measurements obtained via abdominal BIA.
• While minor changes occur, BIA measurements for body composition are relatively stable post-meal.
• Standard practice of performing body composition analysis in fasting conditions is advised for optimal accuracy.