Cited by 175Cardiovascular and exercise physiologyHeart Failure Treatment and ManagementSports Performance and Training

Isolated Quadriceps Training Increases Maximal Exercise Capacity in Chronic Heart Failure

Open access
Esposito, Fabio, Reese, Van, Shabetai, Ralph, Wagner, Peter D., Richardson, Russell S.·2011·Journal of the American College of Cardiology

Abstract

Objectives This study sought to elucidate the mechanisms responsible for the benefits of small muscle mass exercise training in patients with chronic heart failure (CHF).Background How central cardiorespiratory and/or peripheral skeletal muscle factors are altered with small muscle mass training in CHF is unknown.Methods We studied muscle structure, and oxygen (O(2)) transport and metabolism at maximal cycle (whole-body) and knee-extensor exercise (KE) (small muscle mass) in 6 healthy controls and 6 patients with CHF who then performed 8 weeks of KE training (both legs, separately) and repeated these assessments.Results Pre-training cycling and KE peak leg O(2) uptake (Vo(2peak)) were ~17% and ~15% lower, respectively, in the patients compared with controls. Structurally, KE training increased quadriceps muscle capillarity and mitochondrial density by ~21% and ~25%, respectively. Functionally, despite not altering maximal cardiac output, KE training increased maximal O(2) delivery (~54%), arterial-venous O(2) difference (~10%), and muscle O(2) diffusive conductance (D(M)O(2)) (~39%) (assessed during KE), thereby increasing single-leg Vo(2peak) by ~53%, to a level exceeding that of the untrained controls. Post-training, during maximal cycling, O(2) delivery (~40%), arterial-venous O(2) difference (~15%), and D(M)O(2) (~52%) all increased, yielding an increase in Vo(2peak) of ~40%, matching the controls.Conclusions In the face of continued central limitations, clear improvements in muscle structure, peripheral convective and diffusive O(2) transport, and subsequently, O(2) utilization support the efficacy of local skeletal muscle training as a powerful approach to combat exercise intolerance in CHF.

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 · 10.1016/j.jacc.2011.06.025

Cites

44 of 44 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
Esposito, F., Reese, V., Shabetai, R., Wagner, P. D., & Richardson, R. S.
Affiliations
  • University of Milan (IT)
  • University of Utah (US)
  • University of California San Diego (US)
Corresponding author
Esposito, Fabio
Venue
Journal of the American College of Cardiology
Publisher
Elsevier BV
Published
2011-09
Volume
58
Issue
13
Pages
1353-1362
ISSN
0735-1097 (ISSN-L)
OpenAlex
W1948975945
Cited by
175
References
44
Citations by year
2026: 13 · 2025: 6 · 2024: 10 · 2023: 11 · 2022: 15 · 2021: 18 · 2020: 13 · 2019: 17 · 2018: 11 · 2017: 13 · 2016: 13 · 2015: 12 · 2014: 9 · 2013: 6 · 2012: 7
FWCI
19.65
Type
journal article
Language
en
Open access
Locations
  • Journal of the American College of Cardiology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health, National Heart, Lung, and Blood Institute (HL 09183)
  • Tobacco-Related Disease Research Program (15RT-0100)
Topics
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Heart Failure Treatment and Management
  • Health Sciences › Medicine › Orthopedics and Sports Medicine › Sports Performance and Training
Keywords
chronic heart failure, quadriceps, exercise capacity, oxygen transport, muscle capillarity, mitochondrial density, arteriovenous oxygen difference, exercise intolerance
MeSH terms
Biological Transport, Active, Biopsy, Blood Flow Velocity, Exercise Test, Follow-Up Studies, Cardiac Catheterization, Heart Failure, Humans, Male, Microscopy, Electron, Middle Aged, Mitochondria, Muscle, Oxygen, Oxygen Consumption, Severity of Illness Index, Stroke Volume, Exercise Tolerance, Disease Progression, Quadriceps Muscle

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