Reproducibility of insulin sensitivity measured by the minimal model method

Area of Science:

• Metabolic Physiology
• Endocrinology

Background:

• Insulin resistance is central to metabolic disorders like diabetes and hypertension.
• Factors such as aging, obesity, and lifestyle acutely influence insulin sensitivity.

Purpose of the Study:

• To assess day-to-day variability in insulin sensitivity and glucose homeostasis in healthy young men.
• To evaluate the reliability of insulin sensitivity measurements over a three-week interval.

Main Methods:

• Utilized the minimal model method (S1) to determine insulin sensitivity index.
• Measured basal and post-glucose insulin/glucose levels and lipid profiles.
• Conducted assessments on two occasions (days 1 and 21) after a standardized diet and overnight fast.

Main Results:

• Insulin sensitivity index (S1) demonstrated a high correlation between day 1 and day 21 (r=0.78, p<0.0007).
• The coefficient of variation for S1 was 14.4%, indicating good intra-individual reproducibility.
• Physiological parameters like blood pressure and body weight remained stable.

Conclusions:

• Insulin sensitivity exhibits significant day-to-day stability in healthy young men.
• The minimal model method provides reliable measurements of insulin sensitivity over short intervals.
• This stability is fundamental for understanding glucose metabolism and potential interventions for insulin resistance.