Infraspinatus (Infra L)
4cm below spine of scapula, over infraspinous fossa
OrientationParallel to spine of scapula
Preview — open the 3D viewer to rotate the model and check neighbouring muscles.
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per Criswell 2011, site „Infraspinatus“, p. 302
Boettcher CE, Ginn KA, Cathers I. Standard maximum isometric voluntary contraction tests for normalizing shoulder muscle EMG. J Orthop Res. 2008;26(12):1591-1597.
Boettcher et al. (2008) described 15 standardized maximum isometric voluntary contraction (MVIC) tests for 12 shoulder muscles to normalize shoulder EMG, recorded with a combination of surface and intramuscular electrodes. The position used here is aligned with this work — it is designed for reproducible comparisons between sessions and subjects.
Based on SENIAM recommendations (Hermens et al. 2000). Not an official SENIAM product. See all references → · SENIAM reference table · How electrodes are placed (guide) · Glossary
The M. Infraspinatus (Infraspinatus) is a muscle of the shoulder region. It is responsible for external rotation at shoulder joint, stabilization of humeral head (rotator cuff). This muscle is not covered by the official SENIAM catalogue — placement is based on established clinical literature. This page documents the exact electrode position, anatomical attachments and a standardized test movement based on Hermens et al. (2000).
Innervation after Perotto AO, Anatomical Guide for the Electromyographer, 5th ed. 2011 — an anatomical reference, not an electrode placement recommendation.
External rotation of arm at 90 degrees abduction against resistance
This muscle has no SENIAM-standardized electrode position. Placement should be based on anatomical knowledge.
As the most important external rotator of the cuff, any related external-rotation task works.
Konrad P. The ABC of EMG. Noraxon; 2005, p. 31. Konrad describes this test at group level; it applies to all muscles of the group. · Why and how to normalise to MVC
The electrode is placed — what next? easyEMG visualises muscle activity in real time, with SENIAM-compliant placement guidance, up to 4 channels at once and biofeedback training right afterwards.
In rehabilitation, the Infraspinatus is typically recorded to track progress and retrain activation.
4cm below spine of scapula, over infraspinous fossa. Orientation: Parallel to spine of scapula. Not covered by SENIAM — placement per Boettcher et al. 2008.
External rotation of arm at 90 degrees abduction against resistance. It serves as a signal check before recording: with correct electrode placement the EMG amplitude rises clearly during this movement.
No. The M. Infraspinatus is not included in the official SENIAM catalogue. The electrode position documented here follows the established protocol per Boettcher et al. 2008.
