Why the Shoulder Is So Vulnerable (And What Stabilises It), with Professor Donald Neumann

When you raise your arm, which muscles produce the movement, and which keep the shoulder stable enough for it to happen?

In this episode of Stronger With Time, I speak with Professor Donald Neumann, PT, PhD, FAPTA, about how muscles produce, control and stabilise movement as part of a coordinated system, using the shoulder as the primary example.

Don is Professor Emeritus of Physical Therapy at Marquette University and the author of Neumann’s Kinesiology of the Musculoskeletal System.

We discuss:

• What it means for a muscle to be functioning well

• Why few muscles perform a meaningful action independently

• How muscular force couples produce and control movement

• Why the shoulder’s mobility places greater demands on muscular control

• How the deltoid and rotator cuff share the work of raising the arm

• How the serratus anterior and trapezius contribute to scapular movement

• What the commonly cited two-to-one scapulohumeral rhythm describes

• When scapular dyskinesis may warrant closer attention

• Why external-rotation strength depends partly on the muscles anchoring the scapula

• Whether the lower trapezius and serratus anterior should be trained separately or within larger movements

• How anatomical variation influences the way we assess the shoulder and hip

• What Don’s current research may reveal about the actions of individual scapular muscles

This conversation is for coaches, trainers, physiotherapists and serious lifters who want a clearer understanding of what produces, controls and stabilises shoulder movement, and what this means for assessment and training.

See how these principles apply to movement assessment and program design in Weak Links & Movement:

https://tonyboutagy.com/weak-links-movement-full-course

Professor Donald Neumann

Marquette University profile:https://www.marquette.edu/physical-therapy/directory/donald-neumann.php

Neumann’s Kinesiology of the Musculoskeletal System, Fourth Edition:https://shop.elsevier.com/books/neumann-s-kinesiology-of-the-musculoskeletal-system/neumann/978-0-323-71859-2

Review of the serratus anterior:https://pubmed.ncbi.nlm.nih.gov/30737019/

Review of the trapezius:https://pubmed.ncbi.nlm.nih.gov/30797676/

Professor Neumann’s publications on PubMed:https://pubmed.ncbi.nlm.nih.gov/?term=Neumann+DA%5BAuthor%5D

Tony Boutagy / Stronger With Time

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