TY - JOUR
T1 - Tendon properties and muscle architecture for knee extensors and plantar flexors in boys and men
AU - Kubo, Keitaro
AU - Teshima, Takanori
AU - Ikebukuro, Toshihiro
AU - Hirose, Norikazu
AU - Tsunoda, Naoya
N1 - Funding Information:
This study was supported by a Grant-in-Aid for Young Scientists (A) ( 21680047 to K. Kubo) from the Japan Society for the Promotion of Science . The authors would like to thank Mr. Shinkawa K. and Mr. Ohkawa M. for their conscientious work in this project and the subjects and their parents who participated in this study.
PY - 2014/5
Y1 - 2014/5
N2 - Background The purpose of this study was to compare the elastic properties and size of tendinous structures and muscle architecture for knee extensors and plantar flexors in boys and men. Methods Twenty-two early pubescent boys (9.6-12.7 yrs) and 23 young adult men (19.8-26.2 yrs) participated in this study. The maximal strain and thickness of tendinous structures for knee extensors and plantar flexors were measured using ultrasonography. In addition, the fascicle lengths of vastus lateralis and medial gastrocnemius muscles were measured. Findings The maximal strain of tendinous structures for plantar flexors was significantly greater in boys than in men, while there was no difference in the maximal strain for knee extensors between the two groups. The relative thickness (to body mass1/3) of Achilles tendon was significantly greater in boys than in men, although there was no difference in that of patellar tendon between the two groups. The relative fascicle length (to limb length) of vastus lateralis muscle was significantly lower in boys than in men, although there was no difference in that of medial gastrocnemius muscle between the two groups. Interpretation These results suggest that the amount of changes in the elastic properties and sizes of tendinous structures and in the fascicle lengths from early pubescence to maturity is different for different muscle groups (in particular, the knee extensors and the plantar flexors).
AB - Background The purpose of this study was to compare the elastic properties and size of tendinous structures and muscle architecture for knee extensors and plantar flexors in boys and men. Methods Twenty-two early pubescent boys (9.6-12.7 yrs) and 23 young adult men (19.8-26.2 yrs) participated in this study. The maximal strain and thickness of tendinous structures for knee extensors and plantar flexors were measured using ultrasonography. In addition, the fascicle lengths of vastus lateralis and medial gastrocnemius muscles were measured. Findings The maximal strain of tendinous structures for plantar flexors was significantly greater in boys than in men, while there was no difference in the maximal strain for knee extensors between the two groups. The relative thickness (to body mass1/3) of Achilles tendon was significantly greater in boys than in men, although there was no difference in that of patellar tendon between the two groups. The relative fascicle length (to limb length) of vastus lateralis muscle was significantly lower in boys than in men, although there was no difference in that of medial gastrocnemius muscle between the two groups. Interpretation These results suggest that the amount of changes in the elastic properties and sizes of tendinous structures and in the fascicle lengths from early pubescence to maturity is different for different muscle groups (in particular, the knee extensors and the plantar flexors).
KW - Fascicle length
KW - Strain
KW - Thickness
KW - Ultrasonography
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U2 - 10.1016/j.clinbiomech.2014.04.001
DO - 10.1016/j.clinbiomech.2014.04.001
M3 - Article
C2 - 24768224
AN - SCOPUS:84902075121
SN - 0268-0033
VL - 29
SP - 506
EP - 511
JO - Clinical Biomechanics
JF - Clinical Biomechanics
IS - 5
ER -