Quantitative measurement of quadriceps femoris with MRI - Morphological change of contraction phase and relaxation phase

Naoko Samejima, Toru Fukubayashi, Yutaka Miyanaga, Shinya Kuno, Mamoru Niitsu, Kenichi Oomori, Yoshiyuki Daimon

Research output: Contribution to journalArticle

Abstract

The purpose of this study was to investigate the mechanism of the dynamic morphological change of the femoral extensor evoked by contraction. In this study, the morphological changes during contraction and relaxation of the femoral extensor were analysed using MRI. and, the centers of gravity of the entire extensor group and of each extensor component were calculated using a pattern analyzer. The subjects were 10 female college basketball players, aged 18 to 22 years, with no history of knee injuries. The results were as follows : 1. The shift of the center of gravity of each component was very characteristic. 2. The greatest dynamic morphological change was observed in the middle of the femoral extensors when the most muscle volume was involved, and the muscles were at their maximal volume. 3. During muscle contraction, obvious anterior protrusion of the muscle belly of each component of the quadriceps femoris was observed. The muscular force may be transferred effectively into the patellar tendon insertion.

Original languageEnglish
Pages (from-to)111-118
Number of pages8
JournalJapanese Journal of Physical Fitness and Sports Medicine
Volume45
Issue number1
Publication statusPublished - 1996 Feb
Externally publishedYes

Keywords

  • Center of gravity
  • MRI
  • Quadriceps femoris

ASJC Scopus subject areas

  • Physiology
  • Orthopedics and Sports Medicine
  • Public Health, Environmental and Occupational Health
  • Physical Therapy, Sports Therapy and Rehabilitation

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    Samejima, N., Fukubayashi, T., Miyanaga, Y., Kuno, S., Niitsu, M., Oomori, K., & Daimon, Y. (1996). Quantitative measurement of quadriceps femoris with MRI - Morphological change of contraction phase and relaxation phase. Japanese Journal of Physical Fitness and Sports Medicine, 45(1), 111-118.