The Study
Endotoxin Inhibits the Reproductive Neuroendocrine Axis While Stimulating Adrenal Steroids: A Simultaneous View from Hypophyseal Portal and Peripheral Blood.
This study watched what happened to sheep's hormones after giving them a substance that makes them sick. It saw that some hormones went down and others went up, but it didn't prove the sickness caused the changes — it just saw them happen together.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
When sheep got a bacterial toxin, their brain stopped sending signals to make baby-making hormones, while stress and fever hormones went up.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 511 / 100
Quality score
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1This suggests that when the body fights infection, it may shut down reproduction as a side effect — possibly to save energy.
- 2GnRH dropped by 63% in amount and 68% in pulse strength; LH dropped in amount, pulse strength, and frequency; cortisol, progesterone, and body temperature all rose significantly.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Endocrinology
Year
1997
Authors
D. Battaglia, J. Bowen, H. Krasa, L. Thrun, C. Viguié, F. Karsch
Related Content
Claims (4)
In sheep without ovaries, a single intravenous dose of endotoxin reduces the pulsing of GnRH and LH hormones in the brain within seven hours, lowering both the amount and frequency of hormone release.
In sheep without ovaries, endotoxin reduces the frequency and size of luteinizing hormone pulses and lowers overall luteinizing hormone levels in the blood, indicating decreased output from the pituitary gland.
In sheep without ovaries, a single intravenous injection of endotoxin at 400 ng/kg causes measurable increases in cortisol, progesterone, and body temperature.
Higher levels of the stress hormone cortisol reduce the signal from the hypothalamus that triggers testosterone production.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.