Instant Access to the Journals you Need

Read Online + Print Articles, for just $40 a month.

Impact of Acute Biochemical Castration on Insulin Sensitivity in Healthy Adult Men

Impact of Acute Biochemical Castration on Insulin Sensitivity in Healthy Adult Men


Introduction. Evidence supports an inverse relationship between serum testosterone (T) and insulin resistance in men. However, data with respect to causality are limited. The aim of this study was to explore the impact of acute biochemical castration on insulin sensitivity in healthy adult men. Methods. Ten healthy, adult males (mean age 41.0 ± 3.9 yr) were studied. Subjects were studied at baseline and after 2 and 4 weeks of biochemical castration. Outpatient hospital research setting. Body composition (dual-energy x-ray absorptiometry), energy expenditure (indirect calorimetry), abdominal and visceral adiposity (MRI), skeletal muscle intramyocellular lipid content ((IMCL) 1 H-MR spectroscopy), and insulin sensitivity (hyperinsulinemic-euglycemic clamp) were assessed before and after 2 and 4 weeks of biochemical castration induced by a GnRH antagonist (acyline 300 μg/kg subcutaneous every 10–14 days). Serum T, insulin and glucose levels, body composition, abdominal visceral fat, IMCL, and glucose disposal rate (M) were measured. Results and Conclusion. Acyline administration suppressed serum T to frankly hypogonadal levels in all subjects for the duration of the study (P <0.009). No significant changes in body composition, energy expenditure, or M were observed at either 2 or 4 weeks of castration. Acyline is an effective GnRH antagonist inducing acute castration in all subjects. ii) Four weeks of biochemical castration has no impact on insulin sensitivity in healthy men likely due to unchanged body composition variables. iii) Insulin resistance associated with chronic low T levels may be largely driven by decreased fat free mass, increased percent body fat, and/or other metabolic regulatory factors.
Loading next page...

You're reading a free preview. Sign up for Instant Access to thousands of journals for just $40/month.

By signing up, you agree to DeepDyve's Terms of Service and Privacy Policy.

What content is in DeepDyve?

  • Read and share from thousands of the leading scholarly journals from Springer, Elsevier, Nature, IEEE, Wiley-Blackwell and more.
  • All the latest content is available, no embargo periods.

Rent Scholarly Articles?

  • Read the full article in your browser.
  • Each month you can print 20 pages for free.
  • Access all of your rentals from the cloud anywhere you have an internet connection.
  • Beautiful reading experience – Full charts and figures, just like the PDF.
  • Read as much as you'd like - whenever you'd like.

Happy Users

“In one word renting from DeepDyve is FANTASTIC!!! ... 99% of the time I only need access to an article for a month or so, so renting the articles is perfect for me.”

Adam S.

“Thanks for a great service! For an unaffiliated science blogger like myself this is like a dream come true.”

Seppo P.

“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”

Daniel C.

“Let me seize this opportunity and congratulate you on the service you are rendering to the scientific community.”

Joao B.