Abstract:
OBJECTIVE:To compare paralyzed quadriceps force properties and femur compressive loads in an upright functional task during conventional constant-frequency stimulation and force feedback-modulated stimulation. DESIGN:Crossover trial. SETTING:Research laboratory. PARTICIPANTS:Subjects (N=13; 12 men, 1 woman) with motor-complete spinal cord injury. INTERVENTIONS:Subjects performed 2 bouts of 60 isometric quadriceps contractions while supported in a standing frame. On separate days, subjects received constant-frequency stimulation at 20Hz (CONST) or frequency-modulated stimulation triggered by a change in force (FDBCK). During FDBCK, a computer algorithm responded to each 10% reduction in force with a 20% increase in stimulation frequency. MAIN OUTCOME MEASURES:A biomechanical model was used to derive compressive loads on the femur, with a target starting dose of load equal to 1.5 times body weight. RESULTS:Peak quadriceps force and fatigue index were higher for FDBCK than CONST (P<.05). Within-train force decline was greater during FDBCK bouts, but mean force remained above CONST values (P<.05). As fatigue developed during repetitive stimulation, FDBCK was superior to CONST for maintenance of femur compressive loads (P<.05). CONCLUSIONS:Feedback-modulated stimulation in electrically activated stance is a viable method to maximize the physiologic performance of paralyzed quadriceps muscle. Compared with CONST, FDBCK yielded compressive loads that were closer to a targeted dose of stress with known osteogenic potential. Optimization of muscle force with FDBCK may be a useful tactic for future training-based antiosteoporosis protocols.
journal_name
Arch Phys Med Rehabiljournal_title
Archives of physical medicine and rehabilitationauthors
Dudley-Javoroski S,Littmann AE,Chang SH,McHenry CL,Shields RKdoi
10.1016/j.apmr.2010.10.031subject
Has Abstractpub_date
2011-02-01 00:00:00pages
242-9issue
2eissn
0003-9993issn
1532-821Xpii
S0003-9993(10)00863-4journal_volume
92pub_type
杂志文章abstract:OBJECTIVE:To investigate the relationship between sedentary behavior and quality-adjusted life years (QALYs) among participants in the Osteoarthritis Initiative. DESIGN:Longitudinal, observational design. SETTING:Osteoarthritis Initiative cohort. PARTICIPANTS:Individuals (N=1794) from a prospective, multicenter long...
journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章,多中心研究
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更新日期:2017-12-01 00:00:00
abstract::This study examined the extent of kinematic symmetry of lower limbs when walking. Twelve able-bodied subjects were measured with a device which recorded three-dimensional motion of hip and knee joints bilaterally. Comparisons of right and left sagittal, transverse, and coronal plane motions were conducted in the time ...
journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章
doi:
更新日期:1984-04-01 00:00:00
abstract::The history, pathoanatomy and pathophysiology, clinical picture, differential diagnosis, diagnostic evaluation, and treatment of cervical radiculopathy are reviewed. The review is based on a 10-year Medline literature search, review of bibliographies in textbooks, and bibliographies in articles obtained through the se...
journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章,评审
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journal_title:Archives of physical medicine and rehabilitation
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abstract:UNLABELLED:Krause JS, Zhai Y, Saunders LL, Carter RE. Risk of mortality after spinal cord injury: an 8-year prospective study. OBJECTIVE:To evaluate a theoretical model for mortality after spinal cord injury (SCI) by sequentially analyzing 4 sets of risk factors in relation to mortality (ie, adding 1 set of factors to...
journal_title:Archives of physical medicine and rehabilitation
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更新日期:2009-10-01 00:00:00
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journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章,meta分析
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abstract::The intensity of associated movement or motor overflow in the contralateral limb during a unimanual task was evaluated in postacute traumatic brain injured (TBI) young adults with left side hemiplegia and age-matched controls. Both groups demonstrated increased overflow with increasing active limb force, although the ...
journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章
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journal_title:Archives of physical medicine and rehabilitation
pub_type: 临床试验,杂志文章
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更新日期:2000-09-01 00:00:00
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journal_title:Archives of physical medicine and rehabilitation
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doi:10.1016/j.apmr.2004.04.044
更新日期:2004-12-01 00:00:00
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journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章,多中心研究
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更新日期:2015-07-01 00:00:00
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journal_title:Archives of physical medicine and rehabilitation
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doi:10.1016/j.apmr.2008.07.019
更新日期:2009-02-01 00:00:00
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journal_title:Archives of physical medicine and rehabilitation
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更新日期:2010-11-01 00:00:00
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journal_title:Archives of physical medicine and rehabilitation
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doi:
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更新日期:2005-11-01 00:00:00
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journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章
doi:
更新日期:1993-03-01 00:00:00