Quantitative analysis of approximate shapes in a myofiber cross-section and their relationship with myofiber cross-sectional area.
Katsuhito Nagano
PMID 34873377WHAT IT FOUND
In rat soleus muscle, myofiber cross-sections were mostly pentagonal, quadrilateral or hexagonal.
A weak positive correlation linked more corners to larger cross-sectional area. This basic science finding has no immediate application to human therapy.
Key findings
01The most common approximate shape of myofiber cross-sections was pentagonal (41.4%), followed by quadrilateral (27.6%) and hexagonal (23.6%).
02There was a weak positive correlation between the number of corners and the myofiber cross-sectional area, where shapes with more corners were associated with larger area.
STILL TO COME
How it was doneWhat they found
Read the rest of this summary
You get three full summaries a month, free, and we do not ask for a card. Search, the TL;DRs and your library stay unlimited either way.
What it does not show
The study used only five rats, making it impossible to generalize findings to humans or even to broader rat populations. The analysis was limited to the soleus muscle of young rats, so the results may not apply to other muscles or age groups. The correlation between shape and area was weak, indicating that corner count alone is a poor predictor of cross-sectional area. The authors suggest potential future use in physical therapy evaluation, but no human data or clinical outcomes were tested in this study.
Declared interests
There are no conflicts of interest to disclose.
The easy way to misread this
Do not apply these shape-area relationships to human patients. This is a basic science study in rat muscle tissue, and the authors' suggestion that it could help evaluate muscle atrophy in humans is theoretical and untested.