Effect of standing postural deviations on trunk and hip muscle activity.
Ryo Fujitani, Takumi Jiromaru, Noriyuki Kida and 1 others
PMID 28744050WHAT IT FOUND
Sway-back posture raised rectus abdominis activity and lowered internal oblique, iliopsoas, and gluteus maximus activity in 17 healthy adult men with no low back pain history.
Lordosis raised lumbar multifidus activity and lowered lower gluteus maximus activity.
Key findings
01Sway-back posture raised rectus abdominis activity to 3.7 percent of maximum isometric contraction and lowered internal oblique activity to 4.4 percent, compared with neutral posture.
02Sway-back posture lowered iliopsoas activity to 2.4 percent of maximum isometric contraction, upper gluteus maximus activity to 2.9 percent, and lower gluteus maximus activity to 1.7 percent, compared with neutral posture.
03Lordosis posture raised iliocostalis dorsi, iliocostalis lumborum, and lumbar multifidus activity, with lumbar multifidus at 16.0 percent of maximum isometric contraction, and lowered lower gluteus maximus activity to 1.8 percent, compared with neutral posture.
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How it was doneWhat they foundWhat it means for PTs
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What it does not show
Only 17 healthy adult men with no low back pain were studied, so the findings may not apply to people with low back pain. The study measured muscle activity and angles, not pain, function, or treatment outcomes. The postures were instructed and checked by the examiner during short trials, so it does not show what happens during spontaneous daily standing or after training.
The easy way to misread this
Do not read these muscle changes as evidence that correcting sway-back or lordosis will reduce low back pain. The study measured only 17 healthy adults without low back pain, not patients, and did not test pain or treatment outcomes.