Evidence map›Paper›PMID 37505230›Full record

ArticleEuropean journal of applied physiology2024

Weekly minimum frequency of one maximal eccentric contraction to increase muscle strength of the elbow flexors.

Riku Yoshida, Kazuki Kasahara, Yuta Murakami, Shigeru Sato, Midori Tanaka, Kazunori Nosaka, Masatoshi Nakamura

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Article in European journal of applied physiology, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. An erratum has been issued. Cited by 3 papers.

0numbers the graph read from it
0cells of the map it votes in
3citing papers in PubMed
–field-weighted citation impact
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

3 citing papers in PubMed.

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4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

7 authors.

Riku YoshidaDepartment of Rehabilitation Medicine, Maniwa Orthopedics Clinic, Niigata, Niigata, 950-0871, Japan.
Kazuki KasaharaInstitute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, Niigata, Niigata, 950-3198, Japan.
Yuta MurakamiInstitute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, Niigata, Niigata, 950-3198, Japan.
Shigeru SatoDepartment of Rehabilitation, Matsumura General Hospital, 1-1 Kotaroumachi, Taira, Iwaki, Fukushima, 970-8026, Japan.
Midori TanakaDepartment of Rehabilitation, Takeda General Hospital, 3-27 Yamagamachi, Aizuwakamatsu, Fukushima, 965-8585, Japan.
Kazunori NosakaDepartment of Physical Therapy, Niigata University of Health and Welfare, Niigata, Niigata, 950-3198, Japan.ORCID http://orcid.org/0000-0001-7373-4994
Masatoshi NakamuraCentre for Human Performance, School of Medical and Health Sciences, Edith Cowan University, 270 Joondalup Drive, Joondalup, WA, 6027, Australia. nakamuramas@nisikyu-u.ac.jp.ORCID http://orcid.org/0000-0002-8184-1121

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

purposeOur previous study showed that one 3-s maximal eccentric contraction a day performed 5 days a week for 4 weeks (5DW) increased maximal voluntary contraction (MVC) strength of the elbow flexors more than 10%. The present study examined whether muscle strength would still increase when the frequency was reduced to 2 days or 3 days per week.

methodsTwenty-six healthy young adults were recruited in the present study and placed to two groups (n = 13/group) based on the weekly frequency of the one 3-s maximal eccentric contraction for two (2DW) or three days per week (3DW) for 4 weeks. Changes in MVC-isometric, MVC-concentric, MVC-eccentric torque of the elbow flexors, and muscle thickness of biceps brachii and brachialis (MT) before and after the 4-week training were compared between 2DW and 3DW groups, and also compared to the 5DW group in the previous study.

resultsThe 2DW group showed no significant changes in MVC torque. Significant (P < 0.05) increases in MVC-concentric (2.5 ± 10.4%) and MVC-eccentric (3.9 ± 4.9%) torque were observed for the 3DW group, but the magnitude of the increase was smaller (P < 0.05) than that presented by the 5DW group (12.8 ± 9.6%, 12.2 ± 7.8%). No significant changes in MT were evident for any of the groups.

conclusionThese results suggest that at least three days a week are necessary for the one 3-s maximal eccentric contraction to be effective for increasing muscle strength, and more frequent sessions in a week (e.g., 5 days) appear to induce greater increases in muscle strength.

Indexed as

ElbowIsometric ContractionArmHumansMuscle ContractionMuscle, SkeletalMuscle StrengthTorqueYoung AdultLengthening contractionMaximal voluntary contraction torqueMuscle thicknessTraining frequency

Identifiers

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Registered trials

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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.