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[Purpose] This study aimed to clarify the required number of measurements to calculate trunk muscle thickness at each position. [Participants and Methods] The participants were 30 elderly males aged &gt;65 years. The right lumbar multifidus (L2), lumbar multifidus (L5), erector spinae, transversus abdominis, internal oblique, and external oblique muscle thicknesses were measured on longitudinal images obtained using ultrasonography in the lying, sitting, and standing positions. Two measurement values for each muscle thickness was used to calculate the intraclass correlation coefficient (1.1-1.5). [Results] The intraclass correlation coefficients of the abdominal muscle thickness measurements with "great reliabilities" were as follows: 1.3-1.5 for the external oblique muscle and 1.2-1.5 for the internal oblique and transversus abdominis muscles in the lying position; 1.3-1.5 for the external oblique and transversus abdominis muscles and 1.2-1.5 for the internal oblique muscle in the sitting position; the intraclass correlation coefficient in the standing position was 1.5 for the external oblique muscle 1.1-1.5 for the internal oblique muscle and 1.3-1.5 for the transversus abdominis muscle. In all the positions, the intraclass correlation coefficient of the measurements of the back-muscle thicknesses ranged from 1.1 to 1.5 for the right lumbar multifidus (L2), lumbar multifidus (L5), and erector spinae. [Conclusion] Depending on the posture, the abdominal muscles require multiple measurements, whereas the back muscles only require a single measurement.

Intraclass correlation coefficient of trunk muscle thicknesses in different positions measured using ultrasonography