Evidence map›Paper›PMID 27137405›Full record

ArticleDrug and alcohol dependence2016

The effects of resistance exercise on cocaine self-administration, muscle hypertrophy, and BDNF expression in the nucleus accumbens.

Justin C Strickland, Jean M Abel, Ryan T Lacy, Joshua S Beckmann, Maryam A Witte, Wendy J Lynch, Mark A Smith

Open access · greenAbstract read
In one paragraph

Article in Drug and alcohol dependence, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 19 papers, 3 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
19citing papers in PubMed, 3 pooled it
3.7field-weighted citation impact, top 8% 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

19 citing papers in PubMed, 3 syntheses or guidelines pooled it, 28 citations in OpenAlex.

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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

7 authors at 4 institutions in 1 country.

Justin C StricklandDepartment of Psychology, University of Kentucky, Lexington, KY, United States.
Jean M AbelDepartment of Psychiatry and Neurobehavioral Sciences, University of Virginia, Charlottesville, VA, United States.
Ryan T LacyDepartment of Psychology, Franklin and Marshall College, Lancaster, PA, United States.
Joshua S BeckmannDepartment of Psychology, University of Kentucky, Lexington, KY, United States.
Maryam A WitteDepartment of Psychology, Davidson College, Davidson, NC, United States.
Wendy J LynchDepartment of Psychiatry and Neurobehavioral Sciences, University of Virginia, Charlottesville, VA, United States.
Mark A SmithDepartment of Psychology, Davidson College, Davidson, NC, United States; Program in Neuroscience, Davidson College, Davidson, NC, United States. Electronic address: masmith@davidson.edu.
Davidson College · USUniversity of Kentucky · 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

backgroundExercise is associated with positive outcomes in drug abusing populations and reduces drug self-administration in laboratory animals. To date, most research has focused on aerobic exercise, and other types of exercise have not been examined. This study examined the effects of resistance exercise (strength training) on cocaine self-administration and BDNF expression, a marker of neuronal activation regulated by aerobic exercise.

methodsFemale rats were assigned to either exercising or sedentary conditions. Exercising rats climbed a ladder wearing a weighted vest and trained six days/week. Training consisted of a three-set "pyramid" in which the number of repetitions and resistance varied across three sets: eight climbs carrying 70% body weight (BW), six climbs carrying 85% BW, and four climbs carrying 100% BW. Rats were implanted with intravenous catheters and cocaine self-administration was examined. Behavioral economic measures of demand intensity and demand elasticity were derived from the behavioral data. BDNF mRNA expression was measured via qRT-PCR in the nucleus accumbens following behavioral testing.

resultsExercising rats self-administered significantly less cocaine than sedentary rats. A behavioral economic analysis revealed that exercise increased demand elasticity for cocaine, reducing consumption at higher unit prices. Exercising rats had lower BDNF expression in the nucleus accumbens core than sedentary rats.

conclusionsThese data indicate that resistance exercise decreases cocaine self-administration and reduces BDNF expression in the nucleus accumbens after a history of cocaine exposure. Collectively, these findings suggest that strength training reduces the positive reinforcing effects of cocaine and may decrease cocaine use in human populations.

Indexed as

AnimalsBrain-Derived Neurotrophic FactorCocaineCocaine-Related DisordersFemaleGene ExpressionHypertrophyMuscle StrengthNucleus AccumbensPhysical Conditioning, AnimalRatsRats, Long-EvansReinforcement, PsychologyResistance TrainingSelf AdministrationBrain-Derived Neurotrophic FactorCocaineDemand curveDrugPhysical activityRatStrength training

Identifiers

PMID27137405
PMCPMC4880539
OpenAlexW2335797121

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.