Relationship between the bilateral ratios of the thoracic shape and electromyographic activity of the thoracic and lumbar iliocostalis muscles during thoracic lateral translation.
Akira Hirosawa, Fujiyasu Kakizaki, Naruyoshi Komuro and 7 others
PMID 36866015WHAT IT FOUND
In 23 healthy men, lower thoracic shape asymmetry was linked to sideways thoracic translation distance and trunk muscle activity.
No treatment was tested, so this describes posture and movement, not therapy outcomes.
Key findings
01Among 23 healthy men, lower thoracic shape asymmetry was positively correlated with thoracic translation distance and thoracic iliocostalis muscle activity, and negatively correlated with upper thoracic shape and lumbar iliocostalis muscle activity.
02At resting sitting, thoracic lateral deviation was negatively correlated with lower thoracic shape asymmetry and positively correlated with the bilateral difference in thoracic translation distance.
03During right translation, thoracic translation distance was negatively correlated with lower thoracic shape asymmetry and positively correlated with lumbar iliocostalis activity; during left translation, lower thoracic shape asymmetry was positively correlated with thoracic iliocostalis activity.
STILL TO COME
How it was doneWhat they found
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What it does not show
Only 23 healthy adult men were studied, so these relationships may not apply to women or to people with respiratory, spinal, chest, or noticeable spinal or thoracic deformity. The participants were aged 20 to 34, so the study says nothing about older adults. Skin markers may not have matched the underlying thorax exactly, so measured thoracic shape could include spin or rotation rather than pure sideways translation. Surface EMG may have picked up nearby erector spinae muscle activity, so the recorded thoracic and lumbar iliocostalis signals cannot be treated as fully isolated. The study did not measure muscle origin-insertion length, so it cannot show how thoracic shape changes alter iliocostalis length. No treatment was given or compared, so the study cannot show that therapy changes thoracic shape, translation, or muscle activity.
Declared interests
None declared.
The easy way to misread this
Do not read these correlations as evidence that a therapy changes thoracic shape or muscle activity. The study measured 23 healthy men only, gave no treatment, and looked at associations during a short movement task.