Intraexaminer and Interexaminer Reproducibility of the Downing Test for Sacroiliac Joint Evaluation of Symptomatic and Asymptomatic Individuals.

Objective: This study aimed to assess the intraexaminer and interexaminer reproducibility of the Downing test in sacroiliac joint evaluation in symptomatic and asymptomatic individuals.

Methods: A reliability study was conducted with a test-retest design in 54 college students of both sexes. To assess the intraexaminer reproducibility, each participant was evaluated twice by the same examiner with a 7-day interval, and to assess the interexaminer reproducibility, each participant was evaluated by 2 examiners.

Concurrent validity of the pressure biofeedback unit and surface electromyography in measuring transversus abdominis muscle activity in patients with chronic nonspecific low back pain.

Background: The Pressure biofeedback unit (PBU) is an assessment tool used in clinical practice and research aimed to indirectly analyze the transversus abdominis (TrA) muscle activity. The concurrent validity of the PBU in a clinically relevant sample is still unclear.

Objective: The purpose of this study was to evaluate the concurrent validity and diagnostic accuracy of the PBU in measuring TrA muscle activity in patients with chronic nonspecific low back pain.