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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Farup, Jean Kjølhede, Tue Sørensen, Henrik Dalgas, Ulrik Møller, Andreas B. Vestergaard, Poul F. Ringgaard, Steffen Bojsen-Møller, Jens Vissing, Kristian |
| Description | Country affiliation: Denmark Author Affiliation: Farup J ( Department of Sport Science, Aarhus University, Aarhus, Denmark.) |
| Abstract | Fascicle angle (FA) is suggested to increase as a result of fiber hypertrophy and furthermore to serve as the explanatory link in the discrepancy in the relative adaptations in the anatomical cross-sectional area (CSA) and fiber CSA after resistance training (RT). In contrast to RT, the effects of endurance training on FA are unclear. The purpose of this study was therefore to investigate and compare the longitudinal effects of either progressive endurance training (END, n = 7) or RT (n = 7) in young untrained men on FA, anatomical CSA, and fiber CSA. Muscle morphological measures included the assessment of vastus lateralis FA obtained by ultrasonography and anatomical CSA by magnetic resonance imaging of the thigh and fiber CSA deduced from histochemical analyses of biopsy samples from m. vastus lateralis. Functional performance measures included VO2max and maximal voluntary contraction (MVC). The RT produced increases in FA by 23 ± 8% (p < 0.01), anatomical CSA of the knee extensor muscles by 9 ± 3% (p = 0.001), and fiber CSA by 19 ± 7% (p < 0.05). RT increased knee extensor MVC by 20 ± 5% (p < 0.001). END increased VO2max by 10 ± 2% but did not evoke changes in FA, anatomical CSA, or in fiber CSA. In conclusion, the morphological changes induced by 10 weeks of RT support that FA does indeed serve as the explanatory link in the observed discrepancy between the changes in anatomical and fiber CSA. Contrarily, 10 weeks of endurance training did not induce changes in FA, but the lack of morphological changes from END indirectly support the fact that fiber hypertrophy and FA are interrelated. |
| File Format | HTM / HTML |
| ISSN | 10648011 |
| Issue Number | 2 |
| Volume Number | 26 |
| e-ISSN | 15334287 |
| Journal | Journal of Strength and Conditioning Research |
| Language | English |
| Publisher | Lippincott Williams & Wilkins |
| Publisher Date | 2012-02-01 |
| Publisher Place | United States |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Sport Sciences Adaptation, Physiological Muscle Fibers, Skeletal Cytology Muscle Strength Physical Education And Training Methods Quadriceps Muscle Anatomy & Histology Physiology Resistance Training Adult Bicycling Exercise Humans Magnetic Resonance Imaging Male Muscle Contraction Oxygen Consumption Random Allocation Ultrasonography Young Adult Comparative Study Journal Article Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Orthopedics and Sports Medicine Physical Therapy, Sports Therapy and Rehabilitation Sports Science |
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