Methods for quantifying adipose tissue insulin resistance in overweight/obese humans

Area of Science:

• Metabolic disease research
• Endocrinology
• Obesity studies

Background:

• Adipose tissue insulin resistance is key in obesity-related metabolic dysfunction.
• Current lipolysis assessment methods are complex and costly.
• Need for validated, simplified measurement techniques exists.

Purpose of the Study:

• Validate simplified methods for quantifying adipose tissue insulin resistance.
• Compare simplified indices against hyperinsulinemic-euglycemic clamp studies.
• Assess insulin sensitivity of lipolysis suppression.

Main Methods:

• Hyperinsulinemic-euglycemic clamp studies with glycerol tracer-dilution in 125 overweight/obese adults.
• Assessed insulin-mediated suppression of lipolysis.
• Validated seven indices of adipose tissue insulin resistance.

Main Results:

• Significant range of adipose tissue insulin sensitivity observed (4%-85% glycerol suppression).
• Strong correlations found between reference method and simplified indices (e.g., Adipo-IR, insulin-glycerol product).
• All tested indices demonstrated ability to detect adipose tissue insulin resistance.

Conclusions:

• Simplified index methods reliably quantify adipose tissue insulin sensitivity in overweight/obese humans.
• Adipo-IR index and fasting insulin-glycerol product offer a practical approach for clinical settings.
• These indices demonstrate good sensitivity, specificity, and agreement for clinical utility.