ArticleJournal of physical therapy science2013
The Effect of Shoulder Flexion Angles on the Recruitment of Upper-extremity Muscles during Isometric Contraction.
Article in Journal of physical therapy science, 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
What it found
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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.
The trial behind it
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Who cites it
8 citing papers in PubMed, 16 citations in OpenAlex.
- An Exploratory Study of Biceps Brachii Electromyographic Activity During Traditional Dumbbell Versus Bayesian Cable Curls.Muscles (Basel, Switzerland) · 2025Article
- Promoting active participation in robot-aided rehabilitation via machine learning and impedance control.Frontiers in digital health · 2025Article
- The long head of biceps at the shoulder: a scoping review.BMC musculoskeletal disorders · 2023Article
- Biceps Brachii and Brachioradialis Excitation in Biceps Curl Exercise: Different Handgrips, Different Synergy.Sports (Basel, Switzerland) · 2023Article
- Bilateral Biceps Curl Shows Distinct Biceps Brachii and Anterior Deltoid Excitation Comparing Straight vs. EZ Barbell Coupled with Arms Flexion/No-Flexion.Journal of functional morphology and kinesiology · 2023Article
- Sex differences in shoulder performance fatiguability are affected by arm position, dominance and muscle group.BMC musculoskeletal disorders · 2022Article
- Effects of different types of exercise on muscle activity and balance control.Journal of physical therapy science · 2015Article
- The changes in shoulder rotation strength ratio for various shoulder positions and speeds in the scapular plane between baseball players and non-players.Journal of physical therapy science · 2015Article
Corrections and comments
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Authors and funding
10 authors at 5 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The purpose of this study was to investigate the differences in muscle activation patterns of the biceps brachii (BB) and flexor carpi radialis (FCR) muscles, while measuring the resultant force (RF) at different shoulder flexion angles. [Subjects] Thirteen healthy males (age 24.85±3.4 years, weight; 77.8±7.9 kg; height, 1.7±0.05 m) were enrolled in this study. [Methods] The resultant force was measured by a force transducer . The elbow angle remained constant and the flexion shoulder angle was changed (30°, 45°, 60°, 75° and 90°). [Results] The results of the surface EMG show the largest muscle activities occurred at a shoulder flexion of 75° for BB and 90° for FCR. The largest resultant force was measured at a shoulder flexion angle of 75°. We conclude, that when performing the biceps curl exercise using an arm curl machine, the shoulder should be flexed at 75° to maximize the focus of the exercise for the BB. [Conclusion] These results are useful from the perspective of design as they highlight the differences in the muscle activation of BB and FCR with postural change. Ultimately this knowledge can be used in the design of rehabilitation training for the shoulder as they show that posture can affect muscle activation.
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Registered trials
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.