Abstract:
OBJECTIVE:To evaluate the joint-angle-dependent neuromuscular functions at the affected wrist in hemiplegic subjects after stroke while doing isometric maximal voluntary wrist flexion and extension across different wrist angles. DESIGN:We investigated torques during isometric maximal voluntary wrist flexions and extensions at 8 different wrist angles, ranging from -45 degrees to 60 degrees. We used the associated electromyographic activities of 2 agonist and antagonist muscle pairs related to wrist and elbow joints for the analysis of muscular coactivations. We compared the data obtained from poststroke subjects' affected and unaffected sides. SETTING:A research laboratory in a rehabilitation center. PARTICIPANTS:Eleven subjects with hemiplegia after stroke with passive range of motion (ROM) in the wrist from -45 degrees to 60 degrees. INTERVENTIONS:Not applicable. MAIN OUTCOME MEASURES:Directly measured torques, torques after normalization during maximal isometric wrist contractions, and normalized moving average electromyographic signals of each muscle at the tested positions. RESULTS:The measured torques of the affected wrists were significantly lower than those of the unaffected wrists at all tested angles during wrist flexion and extension (P<.05). The angle-dependent patterns of the normalized torque across the tested wrist angles varied from those of the unaffected wrists (2-way analysis of variance, P<.05). There were decreases in normalized torques during both flexion and extension at the extended positions in the affected group (P<.05). Abnormal cocontractions were found in agonist and antagonist muscle pairs related to wrist and elbow joints, and between the elbow flexor and wrist extensor when subjects did the wrist contractions on the paretic side, especially at the wrist extended positions. CONCLUSIONS:Wrist muscle weakness was distributed unevenly across the selected wrist ROM on the affected side, as represented by the varied patterns of the normalized torque-angle relationship, compared with the unaffected wrists. There were reductions in the selective control of muscle coactivating synergies both single-jointly and cross-jointly in the impaired nervous system during wrist contractions; the extent of these reductions was also related to the wrist angle configuration.
journal_name
Arch Phys Med Rehabiljournal_title
Archives of physical medicine and rehabilitationauthors
Hu X,Tong K,Tsang VS,Song Rdoi
10.1016/j.apmr.2006.02.003subject
Has Abstractpub_date
2006-05-01 00:00:00pages
671-9issue
5eissn
0003-9993issn
1532-821Xpii
S0003-9993(06)00106-7journal_volume
87pub_type
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journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章
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abstract::Eleven subjects reacted to a randomly timed auditory stimulus by extending their right elbows as rapidly as possible under agonist muscle normal state, pretensed and relaxed conditions. Integrated electromyography (emg) was used to validate and quantify muscle state. Total reaction time was divided into premotor react...
journal_title:Archives of physical medicine and rehabilitation
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abstract::The use of transcutaneous electrical nerve stimulation (TENS) has increased in recent years for the management of chronic pain. One of its few contraindications is the presence of a cardiac pacemaker. Clinicians have recommended that cardiac monitoring be performed for a short interrupted period during the first appli...
journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章
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更新日期:1990-01-01 00:00:00
abstract:OBJECTIVE:To describe the types, intensities, and average duration of leisure time physical activities (LTPAs) performed by people with chronic spinal cord injury (SCI). DESIGN:Cross-sectional telephone survey. SETTING:General community. PARTICIPANTS:Men and women with SCI (N=347) who reported engaging in LTPA over ...
journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章
doi:10.1016/j.apmr.2009.12.028
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abstract:OBJECTIVE:To determine the impact of long-term, body weight-supported locomotor training after chronic, incomplete spinal cord injury (SCI), and to estimate the health care costs related to lost recovery potential and preventable secondary complications that may have occurred because of visit limits imposed by insurers...
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pub_type: 杂志文章
doi:10.1016/j.apmr.2017.10.003
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doi:10.1016/j.apmr.2009.07.011
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journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章
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abstract:UNLABELLED:Kwok JC, Hui-Chan CW, Tsang WW. Effects of aging and Tai Chi on finger-pointing toward stationary and moving visual targets. OBJECTIVE:To examine the aging effect on speed and accuracy in finger pointing toward stationary and moving visual targets between young and older healthy subjects and whether or not ...
journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章
doi:10.1016/j.apmr.2009.07.018
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pub_type: 杂志文章
doi:10.1053/apmr.2001.25912
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journal_title:Archives of physical medicine and rehabilitation
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journal_title:Archives of physical medicine and rehabilitation
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