Cited by 77Muscle metabolism and nutritionCardiovascular and exercise physiologySports Performance and Training

17β-Estradiol Supplementation Decreases Glucose Rate of Appearance and Disappearance with No Effect on Glycogen Utilization during Moderate Intensity Exercise in Men

Devries, Michaela C., Hamadeh, Mazen J., Graham, Terry E., Tarnopolsky, Mark A.·2005·The Journal of Clinical Endocrinology & Metabolism

Abstract

CONTEXT AND OBJECTIVE: Women use less carbohydrate during endurance exercise, as compared with men. In rodents, 17beta-estradiol (E2) supplementation robustly increases lipid use and lowers muscle and liver glycogen use during exercise. E2 supplementation has been found to influence substrate selection by decreasing glucose rate of appearance (Ra), disappearance (Rd), and metabolic clearance rate during exercise in humans; however, neither a change in total carbohydrate use nor a sparing of muscle glycogen was demonstrated. SUBJECTS AND METHODS: We investigated the effect of 8 d of E2 (2 mg/d) supplementation on glucose turnover and net muscle glycogen use in 11 men using a randomized, double-blind, placebo-controlled, crossover design. Subjects underwent primed constant infusion of [6,6-(2)H]glucose, and muscle biopsies were taken before and after 90 min of cycling at 65% maximal oxygen uptake. RESULTS: E2 supplementation decreased the respiratory exchange ratio (P = 0.03) and glucose Ra and Rd (both P = 0.04) during exercise, as compared with placebo. E2 supplementation lowered proglycogen (P < 0.05) and total glycogen (P = 0.04) concentration, as compared with placebo; however, there was no effect of E2 on net muscle glycogen use during exercise. CONCLUSIONS: These findings show that E2 supplementation alters fuel selection in exercising men by increasing lipid use and reducing carbohydrate use, glucose Ra (primarily liver glucose production), and Rd (primarily muscle glucose uptake). Furthermore, E2 reduces the basal level of total muscle glycogen, particularly the proglycogen form.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1210/jc.2005-0926

Cites

41 of 41 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Devries, M. C., Hamadeh, M. J., Graham, T. E., & Tarnopolsky, M. A.
Affiliations
  • McMaster University Medical Centre (CA)
  • McMaster University (CA)
  • University of Guelph (CA)
Corresponding author
Tarnopolsky, Mark A.
Venue
The Journal of Clinical Endocrinology & Metabolism
Published
2005-11
Volume
90
Issue
11
Pages
6218-6225
ISSN
  • 0021-972X (ISSN-L)
  • 1945-7197
OpenAlex
W1979765945
Cited by
77
References
41
Citations by year
2026: 4 · 2025: 4 · 2024: 2 · 2023: 5 · 2022: 5 · 2021: 6 · 2020: 4 · 2019: 5 · 2018: 3 · 2016: 2 · 2015: 4 · 2014: 5 · 2013: 3 · 2012: 3
FWCI
1.50
Type
journal article
Language
en
Open access
closed
Locations
  • The Journal of Clinical Endocrinology & Metabolism (publishedVersion)
  • PubMed (publishedVersion)
Funders
Abbott Laboratories
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
  • Health Sciences › Medicine › Orthopedics and Sports Medicine › Sports Performance and Training
Keywords
glucose turnover, glucose appearance rate, muscle glycogen, substrate selection, endurance exercise, respiratory exchange ratio, men
MeSH terms
Adult, Body Weight, Double-Blind Method, Estradiol, Glucose, Glycogen, Humans, Male, Metabolic Clearance Rate, Exercise, Lactic Acid, Lipid Metabolism

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review