Earticle

초록

영어

This study aimed to examine the distribution and contractile properties of single muscle fiber sex/myosin heavy chain (MHC) type-related dif-ferences and to evaluate the correlation of cross-sectional area (CSA) and specific force (SF) in a single muscle fiber. Six young men and six young women were participated in this study. Muscle sample was ob-tained from vastus lateralis muscle. To examine potential gender differ-ences within each fiber contractile properties (CSA, maximal isometric force, SF, maximal shortening velocity) and relationship between CSA and SF of single fiber using Pearson correlation. After mechanical mea-surements, single muscle fiber determined MHC isoforms using silver stain. MHC isoform composition did not differ by sex (chi-square=6.978, P=0.073). There were sex-related differences in CSA and maximal iso-metric force (P<0.05), but no fiber type-related differences (P>0.05). Related to SF and maximal shortening velocity, there were no sex-relat-ed differences only fiber type-related differences (P<0.05). However, there were differences in SF between single fiber types in men but not in women. A negative correlation was found between CSA and SF in both men and women (P<0.05). It is suggested that there might be dif-ferent mechanical properties of cross-bridges according to sex.

목차

Abstract
INTRODUCTION
MATERIALS AND METHODS
Participants
Experimental protocol
Statistical analysis
RESULTS
Single muscle fiber MHC composition
Cross-sectional area
Maximal isometric force
Specific force
Maximal shortening velocity
Relationships between CSA and SF
DISCUSSION
CONFLICT OF INTEREST
ACKNOWLEDGMENTS
REFERENCES

키워드

저자

• Yunah Jeon [ Division of Sports and Health Science, Kyungsung University, Busan, Korea, Mechanical & Molecular Myology Lab, Department of Rehabilitation Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea ]
• Junghwa Choi [ Division of Sports and Health Science, Kyungsung University, Busan, Korea ]
• Hee Jaeng Kim [ Division of Sports and Health Science, Kyungsung University, Busan, Korea ]
• Hojun Lee [ Division of Sports and Health Science, Kyungsung University, Busan, Korea, Mechanical & Molecular Myology Lab, Department of Rehabilitation Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea ]
• Jae-Young Lim [ Mechanical & Molecular Myology Lab, Department of Rehabilitation Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea ]
• Seung-Jun Choi [ Division of Sports and Health Science, Kyungsung University, Busan, Korea ] Corresponding Author

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  JER [Journal of Exercise Rehabilitation]

• 간기

  격월간

• pISSN

  2288-176X

• eISSN

  2288-1778

• 수록기간

  2013~2026

• 등재여부

  SCOPUS,KCI 등재

• 십진분류

  KDC 517 DDC 613