Evidence map›Paper›PMID 29396617›Full record

ArticlePsychopharmacology2018

Resistance exercise decreases heroin self-administration and alters gene expression in the nucleus accumbens of heroin-exposed rats.

Mark A Smith, Gaylen E Fronk, Jean M Abel, Ryan T Lacy, Sarah E Bills, Wendy J Lynch

Abstract read
In one paragraph

Article in Psychopharmacology, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 20 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
20citing papers in PubMed, 2 pooled it
3.1field-weighted citation impact, top 10% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

20 citing papers in PubMed, 2 syntheses or guidelines pooled it, 32 citations in OpenAlex.

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  16. Medications Development for Treatment of Opioid Use Disorder.Cold Spring Harbor perspectives in medicine · 2021
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

6 authors at 3 institutions in 1 country.

Mark A SmithDepartment of Psychology, Davidson College, Davidson, NC, 28035, USA. masmith@davidson.edu.
Gaylen E FronkDepartment of Psychology, Davidson College, Davidson, NC, 28035, USA.
Jean M AbelDepartment of Psychiatry and Neurobehavioral Sciences, University of Virginia, Charlottesville, VA, USA.
Ryan T LacyDepartment of Psychology, Franklin and Marshall College, Lancaster, PA, USA.
Sarah E BillsDepartment of Psychology, Davidson College, Davidson, NC, 28035, USA.
Wendy J LynchDepartment of Psychiatry and Neurobehavioral Sciences, University of Virginia, Charlottesville, VA, USA.
Davidson College · USUniversity of Virginia · USFranklin & Marshall College · US

Funding

Social Influences on Drug-Seeking BehaviorR01DA031725 · NIDA · DAVIDSON COLLEGE · PI SMITH, MARK A · 2012 to 2022
$3.1M
Exercise as a Sex-Specific Intervention Strategy for Cocaine AddictionR01DA039093 · NIDA · UNIVERSITY OF VIRGINIA · PI LYNCH, WENDY JEAN · 2015 to 2019
$1.7M
Physical Activity and Substance AbuseR01DA027485 · NIDA · DAVIDSON COLLEGE · PI SMITH, MARK A · 2009 to 2013
$943k
NIDA NIH HHS R01 DA027485NIDA NIH HHS R01 DA031725NIDA NIH HHS R01 DA039093
6 · The paper itself

Abstract

rationalePreclinical studies consistently report that aerobic exercise decreases drug self-administration and other forms of drug-seeking behavior; however, relatively few studies have examined other types of physical activity.

objectivesThe purpose of the present study was to examine the effects of resistance exercise (i.e., strength training) on heroin self-administration and mRNA expression of genes known to mediate opioid reinforcement and addictive behavior in the nucleus accumbens (NAc) of heroin-exposed rats.

methodsFemale rats were obtained during late adolescence and divided into two groups. Resistance exercise rats were trained to climb a vertical ladder wearing a weighted vest; sedentary control rats were placed repeatedly on the ladder oriented horizontally on its side. All rats were implanted with intravenous catheters and trained to self-administer heroin on a fixed ratio (FR1) schedule of reinforcement. mRNA expression in the NAc core and shell was examined following behavioral testing.

resultsResistance exercise significantly decreased heroin self-administration, resulting in a downward shift in the dose-effect curve. Resistance exercise also reduced mRNA expression for mu opioid receptors and dopamine D1, D2, and D3 receptors in the NAc core. Resistance exercise increased mRNA expression of dopamine D5 receptors in the NAc shell and increased mRNA expression of brain-derived neurotrophic factor (exons I, IIB, IIC, IV, VI, IX) in the NAc core.

conclusionsThese data indicate that resistance exercise decreases the positive reinforcing effects of heroin and produces changes in opioid and dopamine systems in the NAc of heroin-exposed rats.

Indexed as

Resistance TrainingAnimalsBehavior, AnimalBrain-Derived Neurotrophic FactorDrug-Seeking BehaviorFemaleGene Expression RegulationHeroin DependenceNucleus AccumbensRatsRats, Sprague-DawleyReceptors, DopamineReceptors, Opioid, muReinforcement, PsychologyRNA, MessengerSelf AdministrationBrain-Derived Neurotrophic FactorReceptors, DopamineReceptors, Opioid, muRNA, MessengerDopamineHeroinNucleus accumbensRatsResistance exerciseStrength training

Identifiers

PMID29396617
PMCPMC5871570
OpenAlexW2787889057

What OpenQuestion holds

Textmetadata
LicenceTDM
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.