https://scholars.lib.ntu.edu.tw/handle/123456789/505425
Title: | H-reflex, muscle voluntary activation level, and fatigue index of flexor carpi radialis in individuals with incomplete cervical cord injury | Authors: | KWAN-HWA LIN Chen Y.-C. JER-JUNN LUH Wang C.-H. Chang Y.-J. |
Issue Date: | 2012 | Journal Volume: | 26 | Journal Issue: | 1 | Start page/Pages: | 68-75 | Source: | Neurorehabilitation and Neural Repair | Abstract: | Background. Individuals with incomplete spinal cord injury (SCI) are predisposed to muscle fatigue during voluntary exercise. However, the origin of fatigue is unclear. Objective. The authors examined the motoneuron excitability, muscle activation level, and fatigue properties of the flexor carpi radialis muscle, just below the level of injury. Methods. Nine individuals with chronic, incomplete cervical cord injury and 9 age-matched healthy individuals were recruited. The authors tested maximum voluntary contraction (MVC), motoneuron excitability by the maximum amplitude of the H-reflex (Hmax at C-7), and muscle voluntary activation level measured by the interpolated twitch technique. Subjects were fatigued by repetitive maximal voluntary isometric wrist flexion. General fatigue index (GFI), central fatigue index (CFI), and peripheral fatigue index (PFI) of flexor carpi radialis were examined before, during, and immediately after exercise. Results. The Hmax in the SCI group was significantly higher (P =.0028) than in controls. The MVC (P <.001) and voluntary activation level (P =.016) in the SCI group were significantly lower. The GFI and CFI decreased in both the SCI and the non-SCI groups. The PFI in the SCI group was significantly higher (ie, less fatigue) than that in controls at 30 repetitive contractions. Conclusions. In individuals with incomplete SCI, the deficit in central drive is an important source of muscle weakness and fatigue in the muscle below the level of injury. ? American Society of Neurorehabilitation 2012. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84862935725&doi=10.1177%2f1545968311418785&partnerID=40&md5=9221ee95ac56c0e575f2ea0b53f66ce3 https://scholars.lib.ntu.edu.tw/handle/123456789/505425 |
ISSN: | 1545-9683 | DOI: | 10.1177/1545968311418785 | SDG/Keyword: | adult; article; cervical spinal cord injury; chronic disease; clinical article; controlled study; female; flexor carpi radialis muscle; flexor muscle; Hoffmann reflex; human; male; motoneuron; muscle contraction; muscle fatigue; muscle force; nerve excitability; voluntary movement; Adult; Case-Control Studies; Cervical Vertebrae; Electromyography; Female; Forearm; H-Reflex; Humans; Male; Middle Aged; Motor Neurons; Muscle Contraction; Muscle Fatigue; Muscle Weakness; Muscle, Skeletal; Recruitment, Neurophysiological; Spinal Cord Injuries |
Appears in Collections: | 物理治療學系所 |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.