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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Dargeviciute, Gintare Masiulis, Nerijus Kamandulis, Sigitas Skurvydas, Albertas Westerblad, Håkan |
| Description | Country affiliation: Lithuania Author Affiliation: Dargeviciute G ( Centre for Fundamental and Clinical Movement Research, Lithuanian Sports University, Kaunas, Lithuania.) |
| Abstract | We studied the relation between two common force modifications in skeletal muscle: the prolonged force depression induced by unaccustomed eccentric contractions, and the residual force depression (rFD) observed immediately after active shortening. We hypothesized that rFD originates from distortion within the sarcomeres and the extent of rFD: 1) correlates to the force and work performed during the shortening steps, which depend on sarcomeric integrity; and 2) is increased by sarcomeric disorganization induced by eccentric contractions. Nine healthy untrained men (mean age 26 yr) participated in the study. rFD was studied in electrically stimulated knee extensor muscles. rFD was defined as the reduction in isometric torque after active shortening compared with the torque in a purely isometric contraction. Eccentric contractions were performed as 50 repeated drop jumps with active deceleration to 90° knee angle, immediately followed by a maximal upward jump. rFD was assessed before and 5 min to 72 h after drop jumps. The series of drop jumps caused a prolonged force depression, which was about two times larger at 20-Hz than at 50-Hz stimulation. There was a significant correlation between increasing rFD and increasing mechanical work performed during active shortening both before and after drop jumps. In addition, a given rFD was obtained at a markedly lower mechanical work after drop jumps. In conclusion, the extent of rFD correlates to the mechanical work performed during active shortening. A series of eccentric contractions causes a prolonged reduction of isometric force. In addition, eccentric contractions exaggerate rFD, which further decreases muscle performance during dynamic contractions. |
| File Format | HTM / HTML |
| ISSN | 87507587 |
| e-ISSN | 15221601 |
| Journal | Journal of Applied Physiology |
| Issue Number | 8 |
| Volume Number | 115 |
| Language | English |
| Publisher | American Physiological Society |
| Publisher Date | 2013-10-15 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Discipline Physiology Isometric Contraction Muscle, Skeletal Physiology Biological Markers Blood Biomechanical Phenomena Creatine Kinase Electric Stimulation Pain Measurement Time Factors Torque Comparative Study Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physiology Physiology (medical) Sports Science |
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