Evidence map›Paper›PMID 36849120›Full record

ArticleMedicine and science in sports and exercise2023

Effects of Unilateral Eccentric versus Concentric Training of Nonimmobilized Arm during Immobilization.

Trevor C Chen, Shang-Hen Wu, Hsin-Lian Chen, Wei-Chin Tseng, Kuo-Wei Tseng, Hsing-Yu Kang, Kazunori Nosaka

Open access · hybridAbstract read
In one paragraph

Article in Medicine and science in sports and exercise, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
8citing 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

8 citing papers in PubMed, 1 synthesis or guideline pooled it, 11 citations in OpenAlex.

  1. Pooled it
  2. Trial
  3. Trial
  4. Article
  5. Article
  6. Eccentric exercise: Muscle damage to the new normal.Journal of sport and health science · 2026
    Article
  7. Review
  8. Article
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 3 institutions in 1 country.

Trevor C ChenDepartment of Physical Education and Sport Sciences, National Taiwan Normal University, Taipei City, TAIWAN.
Shang-Hen WuDepartment of Physical Education, Health and Recreation, National Chiayi University, Chiayi County, TAIWAN.
Hsin-Lian ChenDepartment of Physical Education, Health and Recreation, National Chiayi University, Chiayi County, TAIWAN.
Wei-Chin TsengDepartment of Physical Education, University of Taipei, Taipei City, TAIWAN.
Kuo-Wei TsengDepartment of Exercise and Health Sciences, University of Taipei, Taipei City, TAIWAN.
Hsing-Yu KangDepartment of Physical Education and Sport Sciences, National Taiwan Normal University, Taipei City, TAIWAN.
Kazunori NosakaCentre for Human Performance, School of Medical and Health Sciences, Edith Cowan University, Joondalup, WA, AUSTRALIA.
National Chiayi University · TWNational Taiwan Normal University · TWUniversity of Taipei · TW

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

introductionThe present study tested the hypothesis that eccentric training (ET) of nonimmobilized arm would attenuate negative effects of immobilization and provide greater protective effects against muscle damage induced by eccentric exercise after immobilization, when compared with concentric training (CT).

methodsSedentary young men were placed to ET, CT, or control group ( n = 12 per group), and their nondominant arms were immobilized for 3 wk. During the immobilization period, the ET and CT groups performed five sets of six dumbbell curl eccentric-only and concentric-only contractions, respectively, at 20%-80% of maximal voluntary isometric contraction (MVCiso) strength over six sessions. MVCiso torque, root-mean square (RMS) of electromyographic activity during MVCiso, and bicep brachii muscle cross-sectional area (CSA) were measured before and after immobilization for both arms. All participants performed 30 eccentric contractions of the elbow flexors (30EC) by the immobilized arm after the cast was removed. Several indirect muscle damage markers were measured before, immediately after, and for 5 d after 30EC.

resultsET increased MVCiso (17% ± 7%), RMS (24% ± 8%), and CSA (9% ± 2%) greater ( P < 0.05) than CT (6% ± 4%, 9% ± 4%, 3% ± 2%) for the trained arm. The control group showed decreases in MVCiso (-17% ± 2%), RMS (-26% ± 6%), and CSA (-12% ± 3%) for the immobilized arm, but these changes were attenuated greater ( P < 0.05) by ET (3% ± 3%, -0.1% ± 2%, 0.1% ± 0.3%) than CT (-4% ± 2%, -4% ± 2%, -1.3% ± 0.4%). Changes in all muscle damage markers after 30EC were smaller ( P < 0.05) for the ET and CT than the control group, and ET than the CT group (e.g., peak plasma creatine kinase activity: ET, 860 ± 688 IU·L -1 ; CT, 2390 ± 1104 IU·L -1 ; control, 7819 ± 4011 IU·L -1 ).

conclusionsThese results showed that ET of the nonimmobilized arm was effective for eliminating the negative effects of immobilization and attenuating eccentric exercise-induced muscle damage after immobilization.

Indexed as

ArmMuscle, SkeletalBiomarkersExerciseHumansIsometric ContractionMaleTorqueBiomarkers

Identifiers

PMID36849120
PMCPMC10241444
OpenAlexW4322488283

What OpenQuestion holds

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LicenceCC BY
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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.