Evidence map›Paper›PMID 20338916›Full record

ArticlePhysical therapy2010

Aerobic exercise alters analgesia and neurotrophin-3 synthesis in an animal model of chronic widespread pain.

Neena K Sharma, Janelle M Ryals, Byron J Gajewski, Douglas E Wright

Open access · bronzeAbstract read
In one paragraph

Article in Physical therapy, 2010. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 33 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
33citing papers in PubMed, 1 pooled it
2.7field-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

33 citing papers in PubMed, 1 synthesis or guideline pooled it, 74 citations in OpenAlex.

  1. Pooled it
  2. Review
  3. Article
  4. Article
  5. Article
  6. Review
  7. Article
  8. Moderate Physical Exercise Activates ATRFrontiers in physiology · 2021
    Article
  9. Saffron (Reports of biochemistry & molecular biology · 2021
    Article
  10. Article
  11. Article
  12. Article
  13. Review
  14. Review
  15. Review
  16. Article
  17. Article
  18. Review
  19. Article
  20. Review
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

4 authors at 2 institutions in 1 country.

Neena K SharmaDepartment of Physical Therapy and Rehabilitation Science, University of Kansas Medical Center, Mail Stop 2002, 3901 Rainbow Blvd, Kansas City, KS 66160, USA. nsharma@kumc.edu
Janelle M Ryals
Byron J Gajewski
Douglas E Wright
University of Kansas Medical Center · USWright State University · US

Funding

Painful Versus Insensate Diabetic NeuropathyR01NS043314 · NINDS · UNIVERSITY OF KANSAS MEDICAL CENTER · PI Douglas E Wright · 2003 to 2026
$6.7M
Microwave-Enhanced Luminescence to Detect Growth FactorsR43CA094404 · NCI · MIRARI BIOSCIENCES, INC. · PI MARTIN, MARK T · 2002 to 2003
$270k
NCI NIH HHS R43 CA094404NINDS NIH HHS R01 NS043314NINDS NIH HHS R01NS43314
6 · The paper itself

Abstract

backgroundPresent literature and clinical practice provide strong support for the use of aerobic exercise in reducing pain and improving function for individuals with chronic musculoskeletal pain syndromes. However, the molecular basis for the positive actions of exercise remains poorly understood. Recent studies suggest that neurotrophin-3 (NT-3) may act in an analgesic fashion in various pain states.

objectiveThe purpose of the present study was to examine the effects of moderate-intensity aerobic exercise on pain-like behavior and NT-3 in an animal model of widespread pain.

designThis was a repeated-measures, observational cross-sectional study.

methodsForty female mice were injected with either normal (pH 7.2; n=20) or acidic (pH 4.0; n=20) saline in the gastrocnemius muscle to induce widespread hyperalgesia and exercised for 3 weeks. Cutaneous (von Frey monofilament) and muscular (forceps compression) mechanical sensitivity were assessed. Neurotrophin-3 was quantified in 2 hind-limb skeletal muscles for both messenger RNA (mRNA) and protein levels after exercise training. Data were analyzed with 2-factor analysis of variance for repeated measures (group x time).

resultsModerate-intensity aerobic exercise reduced cutaneous and deep tissue hyperalgesia induced by acidic saline and stimulated NT-3 synthesis in skeletal muscle. The increase in NT-3 was more pronounced at the protein level compared with mRNA expression. In addition, the increase in NT-3 protein was significant in the gastrocnemius muscle but not in the soleus muscle, suggesting that exercise can preferentially target NT-3 synthesis in specific muscle types. LIMITATIONS: Results are limited to animal models and cannot be generalized to chronic pain syndromes in humans.

conclusionsThis is the first study demonstrating the effect of exercise on deep tissue mechanical hyperalgesia in a rodent model of pain and providing a possible molecular basis for exercise training in reducing muscular pain.

Indexed as

Physical Conditioning, AnimalAnalysis of VarianceAnimalsChronic DiseaseCross-Sectional StudiesDisease Models, AnimalFemaleHyperalgesiaMiceMuscle, SkeletalNeurotrophin 3PainRandom AllocationRNA, MessengerNeurotrophin 3RNA, Messenger

Identifiers

PMID20338916
PMCPMC3171655
OpenAlexW2160920727

What OpenQuestion holds

Textmetadata
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.