The Study
Muscles within muscles: Coordination of 19 muscle segments within three shoulder muscles during isometric motor tasks.
This study shows what happened in 20 young men’s shoulder muscles when they pushed in different directions, but it doesn’t prove that one thing caused another. It’s like taking a photo of how muscles work — it shows a pattern, but not why it happens.
Analysis score
Maximum 44 for a cross-sectional study.
Where the score came from
When young men quickly push in different directions with their arms but don’t actually move, different parts of their shoulder muscles turn on at different times and work together in special teams based on what direction they’re pushing.
Where does this study sit?
Systematic Reviews & Meta-analyses
Max 100Randomized Trials
Max 90Cohort Studies
Max 72Case-Control
Max 58Cross-Sectional
Max 44Case Reports & Series
Max 30Expert Opinion
Max 521 / 100
Quality score
Detailed descriptions of individual patients or small groups. Valuable for identifying new conditions or side effects, but cannot establish generalizable conclusions.
Key takeaways
Summary
Based on the study abstract and findings.
- 1This shows our muscles are smart and flexible — they use different parts for different jobs, which helps us move precisely.
- 219 muscle parts in 3 shoulder muscles were studied.
- 3Their activity changed depending on push direction.
- 4Some parts helped, some worked against, and some adjusted based on the task.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology
Year
2007
Authors
Justin C. Brown, J. Wickham, Darryl J. McAndrew, Xu-Feng Huang
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.