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Akagi, R., Takai, Y., Kato, E., Fukuda, M., Wakahara, T., Ohta, M., Kanehisa, H., Kawakami, Y., & Fukunaga, T. (2009). Relationships between Muscle Strength and Indices of Muscle Cross-Sectional Area Determined during Maximal Voluntary Contraction in Middle-Aged and Elderly Individuals. Journal of Strength and Conditioning Research, 23, 1258-1262.
http://dx.doi.org/10.1519/JSC.0b013e3181918a9b

has been cited by the following article:

• TITLE: Relationship between Abdominal Strength Measured by a Newly Developed Device and Abdominal Muscle Thickness

  AUTHORS: Takanori Noguchi, Shinichi Demura

  KEYWORDS: Ultrasound Imaging Method, Measurement Device, Strength Exertion

  JOURNAL NAME: Advances in Physical Education, Vol.4 No.2, May 5, 2014

  ABSTRACT: Although measurement of abdominal strength is important for evaluating trunk myofunction, adequate devices for these measurements have not been developed. As a consequence, the relationships between abdominal strength and abdominal muscle thickness have also not been determined. This study aimed to develop a new device for measuring abdominal strength and to examine the relationship between abdominal muscle strength and thickness. The subjects in the study included 50 young males (age, 19.1 ± 0.32 years; height, 171.0 ± 6.55 cm; weight, 69.5 ± 12.15 kg). The measurement of abdominal flexion strength had high reliability with an intra-class correlation coefficient (ICC) >0.9. The thickness of the rectus abdominis muscle was measured under two conditions using an ultrasound imaging method; relaxation and strength exertion. Abdominal muscle thickness was significantly thicker during exertion than during relaxation. Abdominal flexion strength showed a significant correlation with muscle thickness during both relaxation (r = 0.69) and strength exertion (r = 0.71). No significant difference was found between these correlation coefficients. In conclusion, the values of abdominal strength determined by our newly-developed measuring device had high reliability, with abdominal flexion strength showing a relatively close relationship with the thickness of the rectus abdominis during strength exertion and relaxation.