1. Yokoyama S, Gamada K, Sugino S, Sasano R. The effect of “the core conditioning exercises” using the stretch pole on thoracic expansion difference in healthy middle-aged and elderly persons. J Bodyw Mov Ther 2012; 16(3):326–329.
3. Hayashi M, Matsumoto Y, Ichikawa N, Osada K. Lowback pain alleviation effect of exercising with a stretch pole on the staff members of a long-term care ward. Shimane Journal of Medical Science 2013; 36:73–78. (in Japanese)
4. Yamaguchi K, Kawaguchi K, Sekikawa K, Tabusadani M, Inamizu T. The effect of muscle stiffness and muscle activity in the dorsolumbar region on Stretch Pole® exercise. Journal of Health Sciences, Hiroshima University 2006; 6(1):52–57. (in Japanese)
7. Teyhen DS, Gill NW, Whittaker JL, Henry SM, Hides JA, Hodges P. Rehabilitative ultrasound imaging of the abdominal muscles. J Orthop Sports Phys Ther 2007; 37(8):450–466.
9. Hodges PW, Richardson CA. Inefficient muscular stabilization of the lumbar spine associated with low back pain. A motor control evaluation of transversus abdominis. Spine 1996; 21(22):2640–2650.
12. Kidd AW, Magee S, Richardson CA. Reliability of real-time ultrasound for the assessment of transversus abdominis function. J Gravit Physiol 2002; 9(1):131–132.
13. Bunce SM, Moore AP, Hough AD. M-mode ultrasound: a reliable measure of transversus abdominis thickness? Clin Biomech 2002; 17(4):315–317.
15. Koppenhaver SL, Hebert JJ, Fritz JM, Parent EC, Teyhen DS, Magel JS. Reliability of rehabilitative ultrasound imaging of the transversus abdominis and lumbar multifidus muscles. Arch Phys Med Rehabil 2009; 90(1):87–94.
16. Cheung WK, Cheung JPY, Lee WN. Role of Ultrasound in Low Back Pain: A Review. Ultrasound Med Biol 2020; 46(6):1344–1358.
17. Kinzey SJ, Armstrong CW. The reliability of the star-excursion test in assessing dynamic balance. J Orthop Sports Phys Ther 1998; 27(5):356–360.
18. Hertel J, Braham RA, Hale SA, Olmsted-Kramer LC. Simplifying the star excursion balance test: analyses of subjects with and without chronic ankle instability. J Orthop Sports Phys Ther 2006; 36(3):131–137.
19. Urquhart DM, Barker PJ, Hodges PW, Story IH, Briggs CA. Regional morphology of the transversus abdominis and obliquus internus and externus abdominis muscles. Clin Biomech 2005; 20(3):233–241.
20. Ota M, Kaneoka K, Hangai M, Koizumi K, Muramatsu T. The effectiveness of lumbar stabilization exercise for chronic low back pain-thickness and asymmetry of abdominal muscles. Japanese Journal of Clinical Sports Medicine 2012; 20(1):72–78. (in Japanese)
21. Reeve A, Dilley A. Effects of posture on the thickness of transversus abdominis in pain-free subjects. Man Ther 2009; 14(6):679–684.