Effect of increased functional residual capacity on the active range of thoracic axial rotation in healthy young men.
Akira Kubo, Masahiro Ishizaka, Yoshiki Takeuchi and 1 others
PMID 29545694WHAT IT FOUND
In 39 healthy young men, adding 500, 1,000, 1,500, or 2,000 ml above resting exhalation reduced supine thoracic axial rotation.
The reduction occurred on both sides.
Key findings
01Increasing air volume at resting exhalation by 500, 1,000, 1,500, or 2,000 ml significantly reduced active thoracic axial rotation.
02On the right, rotation averaged 64.4 ± 15.2 degrees at resting expiration and 52.7 ± 14.5 degrees at 2,000 ml; on the left, 61.3 ± 13.6 and 52.6 ± 14.8 degrees.
03The reduction did not differ between sides.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
All participants were healthy university male students, so the results do not show what happens in women, older adults, or people with COPD. The study did not measure inspiratory capacity or total lung capacity, so it cannot connect the rotation changes to a common COPD severity marker. The findings describe a laboratory measurement effect, not the effect of a therapy or a change over time in patients.
Declared interests
The authors reported no conflicts of interest.
The easy way to misread this
Do not conclude that this study shows how thoracic rotation should be assessed or treated in patients with COPD. It tested only healthy young men and only changed the amount of air at resting exhalation, so it did not test disease, therapy, or long-term change.