Abstract:
OBJECTIVES:To investigate the effect of frequency of alternating current on electrically induced torque in healthy subjects, and to establish an optimum frequency for motor stimulation. DESIGN:A repeated-measures design using 12 subjects (part 1) and 3 subjects (part 2). SETTING:A laboratory setting was used. PARTICIPANTS:Participants were volunteers who met the inclusion criteria. INTERVENTIONS:Alternating current with carrier frequencies between 1 and 15kHz, modulated at 50Hz, was applied to each subject on two separate occasions. The frequencies were applied in a different random order on each occasion and different random orders were used between subjects. For part 1 of this study, six frequencies were used: 1, 2, 4, 7, 10, and 15kHz. For part 2, three frequencies were used: 1, 4, and 10kHz. MAIN OUTCOME MEASURES:Part 1: The maximum electrically induced torque, defined as the torque induced at the pain threshold, was recorded for each applied frequency. Part 2: The variation of torque with increasing stimulus intensity was recorded for each applied frequency. RESULTS:Highest electrically induced torque was produced at the lowest frequency examined (1kHz). Torque decreased systematically with increasing frequency over the frequency range examined. The rate of increase in torque with applied stimulus intensity was also found to decrease systematically with increasing frequency in a way that depended strongly on the skinfold thickness of the subject. CONCLUSIONS:Electrical stimulators using an alternating current waveform typically use a carrier frequency in the range of 2kHz to 4kHz for motor stimulation. This study shows that carrier frequencies in this range, modulated at 50Hz, are a compromise between comfort and maximum torque production. For maximum comfort with a low torque, a frequency close to 10kHz is indicated. For maximum torque, a lower frequency of alternating current (1kHz or less) is preferable.
journal_name
Arch Phys Med Rehabiljournal_title
Archives of physical medicine and rehabilitationauthors
Ward AR,Robertson VJdoi
10.1016/s0003-9993(98)90234-9subject
Has Abstractpub_date
1998-11-01 00:00:00pages
1399-404issue
11eissn
0003-9993issn
1532-821Xpii
S0003-9993(98)90234-9journal_volume
79pub_type
临床试验,杂志文章,随机对照试验abstract:OBJECTIVE:To determine the influence of a warm-up protocol suitable for use in clinical settings on tibial displacement and muscle activity during arthrometric knee laxity assessment. DESIGN:Intervention study in which the subjects served as their own controls. SETTING:The Biomechanics Research Laboratory, University...
journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章
doi:10.1016/s0003-9993(99)90235-6
更新日期:1999-07-01 00:00:00
abstract:OBJECTIVE:To test the feasibility of a classification system developed to record the contents of treatment sessions intended to improve mobility and self-care by persons with a spinal cord injury (SCI) in clinical rehabilitation. DESIGN:Descriptive study. SETTING:Three Dutch SCI facilities. PARTICIPANTS:Participants...
journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章
doi:10.1016/j.apmr.2007.12.044
更新日期:2008-08-01 00:00:00
abstract:OBJECTIVE:To examine demographic, psychiatric symptom, and neuropsychological performance factors associated with duration of unemployment in Iraq/Afghanistan Veterans with a history of mild-to-moderate traumatic brain injury (TBI). DESIGN:Cross-sectional, secondary data analysis of baseline measures in a supported em...
journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章
doi:10.1016/j.apmr.2020.04.008
更新日期:2020-08-01 00:00:00
abstract:OBJECTIVE:To determine the predictive value of measurements of hand edema for the development of reflex sympathetic dystrophy (RSD). DESIGN:Cohort study. SETTING:Departments of rehabilitation medicine in 3 general hospitals and 1 rehabilitation hospital in Japan. PARTICIPANTS:Thirty-four stroke patients. INTERVENTI...
journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章,多中心研究
doi:10.1053/apmr.2002.34830
更新日期:2002-10-01 00:00:00
abstract:UNLABELLED:Significant pain is experienced by the majority of cancer patients during the course of their illness. Despite the widespread availability of effective therapy, undertreatment remains common. Opioid pharmacotherapy has emerged as the mainstay of cancer pain management. Coanalgesic administration, disease-mod...
journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章,评审
doi:
更新日期:2001-03-01 00:00:00
abstract::We report on 2 cases of the effect of modafinil on the self-esteem of patients with spinal cord injury (SCI). The first patient was a 33-year-old man with history of polysubstance abuse and a C6 American Spinal Injury Association (ASIA) grade A injury, who presented for follow-up to the outpatient rehabilitation clini...
journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章,评审
doi:10.1016/j.apmr.2005.01.009
更新日期:2005-09-01 00:00:00
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journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章
doi:10.1016/j.apmr.2003.06.026
更新日期:2004-04-01 00:00:00
abstract:OBJECTIVE:To demonstrate naturalistic motor control speed, coordinated grasp, and carryover from trained to novel objects by an individual with tetraplegia using a brain-computer interface (BCI)-controlled neuroprosthetic. DESIGN:Phase I trial for an intracortical BCI integrated with forearm functional electrical stim...
journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章
doi:10.1016/j.apmr.2018.07.445
更新日期:2019-07-01 00:00:00
abstract:OBJECTIVE:To describe the experiences of clinicians who have used robotic exoskeletons in their practice and acquire information that can guide clinical decisions and training strategies related to robotic exoskeletons. DESIGN:Qualitative, online survey study, and 4 single-session focus groups followed by thematic ana...
journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章
doi:10.1016/j.apmr.2020.08.024
更新日期:2021-02-01 00:00:00
abstract::In this cross-sectional study, the bone mineral density of the lumbar spine, the back extensor strength, and the level of physical activity were determined in 68 healthy, postmenopausal women. Physical activity was determined by a graded questionnaire and varied from sedentary to heavy vocational and avocational activ...
journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章
doi:
更新日期:1988-04-01 00:00:00
abstract:OBJECTIVE:To determine exercise intensity during power wheelchair soccer among a sample of persons with mobility impairments. DESIGN:Cross-sectional descriptive. SETTING:On-site training facilities of multiple power wheelchair soccer teams. PARTICIPANTS:Participants with severe mobility impairments (N=30) (mean ± SD...
journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章
doi:10.1016/j.apmr.2016.05.012
更新日期:2016-11-01 00:00:00
abstract:OBJECTIVE:To test the hypotheses that people with hemiplegia using arms and legs to propel their wheelchairs perform better backward than forward and prefer the backward direction. DESIGN:Within-participant cross-sectional design. PARTICIPANTS:Manual wheelchair users (N=18) with hemiplegia caused by stroke, a sample ...
journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章
doi:10.1016/j.apmr.2013.03.001
更新日期:2013-09-01 00:00:00
abstract::Quantification of cervical extension (CERV EXT) strength is complicated by the inability to stabilize the torso and isolate the CERV EXT muscles. A newly developed machine designed to stabilize the torso and isolate the CERV EXT muscles was used to evaluate the effect of frequency and volume of resistance training on ...
journal_title:Archives of physical medicine and rehabilitation
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1016/0003-9993(93)90065-i
更新日期:1993-10-01 00:00:00
abstract:OBJECTIVE:To evaluate the effects of functional electric stimulation (FES) of lower limb muscles during 30 minutes of upright standing on the central and peripheral hemodynamic response in persons with spinal cord injury (SCI). DESIGN:A repeated-measure design. Subjects were used as their own control and underwent 2 t...
journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章
doi:10.1053/apmr.2001.25984
更新日期:2001-11-01 00:00:00
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journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章,meta分析,评审
doi:10.1016/j.apmr.2012.12.025
更新日期:2013-07-01 00:00:00
abstract::Systemic malignancy can be manifested by musculoskeletal complaints. We review the history, physical examination, and diagnostic imaging studies of a patient whose chief complaints were neck and shoulder pain. This patient also had significant weight loss and a history of tobacco abuse. Aggressive physical therapy and...
journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章
doi:10.1016/0003-9993(94)90118-x
更新日期:1994-08-01 00:00:00
abstract:OBJECTIVE:To determine if patients' level of effort (LOE) in therapy sessions during traumatic brain injury (TBI) rehabilitation modifies the effect of compliance with the 3-Hour Rule of the Centers for Medicare & Medicaid Services. DESIGN:Propensity score methodology applied to the TBI Practice-Based Evidence databas...
journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章
doi:10.1016/j.apmr.2019.01.014
更新日期:2019-10-01 00:00:00
abstract:OBJECTIVES:To determine the frequency and clinical predictors of aspiration within 5 days of acute stroke. DESIGN:Case series. SETTING:Tertiary care center. PATIENTS:Consecutive stroke patients (n = 55) with new neurologic deficit evaluated within 5 days of acute stroke. MAIN OUTCOME MEASURES:Comparison of features...
journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章
doi:10.1016/s0003-9993(98)90200-3
更新日期:1998-01-01 00:00:00
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journal_title:Archives of physical medicine and rehabilitation
pub_type: 临床试验,杂志文章,多中心研究,随机对照试验
doi:10.1016/j.apmr.2004.08.008
更新日期:2005-04-01 00:00:00
abstract::While participation is increasingly defined as the key outcome of rehabilitation, disagreements on and shortcomings in the definition, operationalization, and measurement of this concept abound and interfere with the progress of clinical services and research. This article explores a number of the major issues related...
journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章,评审
doi:10.1016/j.apmr.2009.10.036
更新日期:2010-09-01 00:00:00
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journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章
doi:10.1016/j.apmr.2020.06.004
更新日期:2020-10-01 00:00:00
abstract:OBJECTIVE:To evaluate the effectiveness of short-term, comprehensive inpatient pulmonary rehabilitation in severe chronic obstructive pulmonary disease (COPD). DESIGN:Retrospective analysis of several outcome measures. SETTING:Inpatient pulmonary rehabilitation unit. PARTICIPANTS:Thirty-eight consecutive adult patie...
journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章
doi:10.1016/s0003-9993(96)90132-x
更新日期:1996-11-01 00:00:00
abstract:OBJECTIVE:To evaluate the effect of providing a greater percentage of therapy as contextualized treatment on acute traumatic brain injury (TBI) rehabilitation outcomes. DESIGN:Propensity score methods are applied to the TBI Practice-Based Evidence (TBI-PBE) database, a database consisting of multi-site, prospective, l...
journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章
doi:10.1016/j.apmr.2018.12.037
更新日期:2019-10-01 00:00:00
abstract:OBJECTIVE:To investigate the scaling properties of the Subjective Index of Physical and Social Outcome (SIPSO) after stroke in survivors to hospital discharge, unselected by age. DESIGN:Factor, Mokken, and Rasch analyses of the SIPSO using data from a prospective observational cohort study. SETTING:Three acute care h...
journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章
doi:10.1016/j.apmr.2013.08.243
更新日期:2013-12-01 00:00:00
abstract::Pathology influencing the serratus anterior muscle contributes to classical medial winging of the scapula. Serratus anterior weakness or injury interferes with regular shoulder movement as this muscle stabilizes the medial border of the scapula against the thorax and rotates the scapula upward and laterally with arm e...
journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章
doi:10.1016/0003-9993(86)90018-3
更新日期:1986-10-01 00:00:00
abstract:UNLABELLED:Horn TS, Yablon SA, Chow JW, Lee JE, Stokic DS. Effect of intrathecal baclofen bolus injection on lower extremity joint range of motion during gait in patients with acquired brain injury. OBJECTIVES:To evaluate lower extremity joint range of motion (ROM) during gait before and after intrathecal baclofen (IT...
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:2010-01-01 00:00:00
abstract:OBJECTIVE:To investigate the extent to which neuropsychologic and functional outcome after complicated mild traumatic brain injury (TBI) parallels that of moderate TBI recovery. DESIGN:A longitudinal study comparing neuropsychologic and functional status of persons with complicated mild TBI and moderate TBI at dischar...
journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章
doi:10.1016/j.apmr.2007.12.029
更新日期:2008-05-01 00:00:00
abstract::The influence of the posterior vertebral ligamentous and bony elements on the sagittal range of motion of the lumbar spine has been investigated by observing the effects of sectioning ligaments and pedicles in 17 cadavers of both sexes with an age range from 14 to 78 years. The main investigation showed that the apoph...
journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章
doi:
更新日期:1983-07-01 00:00:00
abstract::Ulnar motor and sensory nerve conduction velocities (NCV) were studied bilaterally in 20 able-bodied subjects for below elbow (BE) and across elbow (AE) segments to assess the effect of 4 different elbow positions on NCV (0 degrees, 45 degrees, 90 degrees, and 135 degrees). Although constant skin stimulation marker po...
journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章
doi:
更新日期:1983-05-01 00:00:00
abstract:OBJECTIVE:To examine the reliability, validity, and factor structure of the Late Life Disability Instrument (LLDI) in individuals who use power wheelchairs as their primary means of mobility. DESIGN:A 4-week, test-retest study design. SETTING:Five Canadian cities. PARTICIPANTS:The validity sample included 115 new an...
journal_title:Archives of physical medicine and rehabilitation
pub_type: 杂志文章
doi:10.1016/j.apmr.2014.05.020
更新日期:2014-10-01 00:00:00