A vertical load applied towards the trunk unilaterally increases the bilateral abdominal muscle activities.
Kazuaki Kinoshita, Kazunari Ishida, Masashi Hashimoto and 4 others
PMID 30936644WHAT IT FOUND
A seated unilateral vertical load test raised trunk muscle activity bilaterally.
For some muscles, contralateral activity was greater. This was in healthy men only, so it does not show patient outcomes or walking demands.
Key findings
01In seven healthy men, all measured trunk muscles increased activity during the TRT compared with sitting.
02During the TRT, activity of the transversus abdominis, rectus abdominis, internal oblique, and multifidus was significantly greater on the contralateral side than on the ipsilateral side.
03The study did not compare the TRT with walking, so it cannot show that these muscle changes reflect walking demands.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
The study included only healthy volunteers, so the muscle pattern may not apply to patients with pain, weakness, or balance problems. The sample was very small, so the results are not generalizable. The study measured muscle activity during a test, not symptoms, function, or walking, so it does not show clinical benefit. It did not compare the TRT with actual movements such as walking, so the relationship between TRT muscle activity and limb movement is unknown. The participants were men only, so the findings may not apply to women.
Declared interests
The authors declared no conflict of interest.
The easy way to misread this
Do not conclude that the TRT improves trunk function or clinical outcomes. The study only recorded muscle activity in healthy men and did not compare the test with walking or measure symptoms.