1. Beach, T. A. C., Parkinson, R. J., Stothart, J. P. and Callaghan, J. P., Effects of prolonged sitting on the passive flexion stiffness of the in vivo lumbar spine, The Spine Journal, Vol.5, No.2 (2005), pp. 145-154.
2. Fujii, T., Kamada, A., Nakamura, R., Kato, T. and Nakashima, M., Development of an algorithm to estimate reaction forces from bathtub during soaking in the bathwater, Mechanical Engineering Journal, Vol.4, No.5 (2017), DOI: 10.1299/mej.17-00243
3. Kato, T., Sato, M., Matsushita, H., Nozawa, T. and Kawashima, R., Effects of sitting posture in bathtub bathing on joint torque and brain activities, Journal of Japanese Society for Medical and Biological Engineering (in Japanese), Vol.54, No.1 (2016), pp22-27.
4. McGill, S. M., Jones, K., Bennett, G. and Bishop P. J., “Passive stiffness of the human neck in flexion, extension, and lateral bending”, Clinical Biomechanics, Vol.9, No.3 (1994), pp.193-198.
5. Mount, F. E., Whitmore, M. and Stealey, S. L., Evaluation of Neutral Body Posture on Shuttle Mission STS-57 (SPACEHAB-1), NASA Technical Memorandum 104805 (2003).