Muscle thickness changes during abdominal hollowing: an assessment of between-day measurement error in controls and patients with chronic low back pain

Spine stabilization exercises, in which patients are taught to perform isolated contractions of the transverses abdominus (TrA) during “abdominal hollowing”, are a popular physiotherapeutic treatment for low back pain (LBP). Successful performance is typically judged by the relative increase in TrA...

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