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Paul W. Hodges - One of the best experts on this subject based on the ideXlab platform.

  • Three dimensional preparatory trunk motion precedes asymmetrical upper Limb Movement.
    Gait & posture, 2000
    Co-Authors: Paul W. Hodges, Andrew G. Cresswell, Karl Daggfeldt, Alf Thorstensson
    Abstract:

    Three-dimensional trunk motion, trunk muscle electromyography and intra-abdominal pressure were evaluated to investigate the preparatory control of the trunk associated with voluntary unilateral upper Limb Movement. The directions of angular motion produced by moments reactive to Limb Movement in each direction were predicted using a three-dimensional model of the body. Preparatory motion of the trunk occurred in three dimensions in the directions opposite to the reactive moments. Electromyographic recordings from the superficial trunk muscles were consistent with preparatory trunk motion. However, activation of transversus abdominis was inconsistent with control of direction-specific moments acting on the trunk. The results provide evidence that anticipatory postural adjustments result in Movements and not simple rigidification of the trunk.

  • altered trunk muscle recruitment in people with low back pain with upper Limb Movement at different speeds
    Archives of Physical Medicine and Rehabilitation, 1999
    Co-Authors: Paul W. Hodges, Carolyn A Richardson
    Abstract:

    Hodges PW, Richardson CA. Altered trunk muscle recruitment in people with low back pain with upper Limb Movement at different speeds. Arch Phys Med Rehabil 1999;80:1005-12. Objective: To compare trunk muscle coordination in people with and without low back pain with varying speeds of Limb Movement. Study Design: Abdominal and back extensor muscle activity in association with upper Limb Movement was compared among three speeds of Movement and between people with and without low back pain. Participants: Fourteen subjects with a history of recurrent low back pain and a group of age- and sex-matched control subjects. Measures: The onsets of electromyographic activity of the trunk and Limb muscles, frequency of trunk muscle responses, and angular velocity of arm Movements. Results: Early activation of transversus abdominis (TrA) and obliquus internus abdominis (OI) occurred in the majority of trials, with Movement at both the fast and intermediate speeds for the control group. In contrast, subjects with low back pain failed to recruit TrA or OI in advance of Limb Movement with fast Movement, and no activity of the abdominal muscles was recorded in the majority of intermediate speed trials. There was no difference between groups for slow Movement. Conclusion: The results indicate that the mechanism of preparatory spinal control is altered in people with lower back pain for Movement at a variety of speeds. © 1999 by the American Congress of Rehabilitation Medi- cine and the American Academy of Physical Medicine and Rehabilitation

  • preparatory trunk motion accompanies rapid upper Limb Movement
    Experimental Brain Research, 1999
    Co-Authors: Paul W. Hodges, Andrew G. Cresswell, Alf Thorstensson
    Abstract:

    Evaluation of trunk Movements, trunk muscle activation, intra-abdominal pressure and displacement of centres of pressure and mass was undertaken to determine whether trunk orientation is a controlled variable prior to and during rapid bilateral Movement of the upper Limbs. Standing subjects performed rapid bilateral symmetrical upper Limb Movements in three directions (flexion, abduction and extension). The results indicated a small (0.4-3.3 degrees) but consistent initial angular displacement between the segments of the trunk in a direction opposite to that produced by the reactive moments resulting from Limb Movement. Phasic activation of superficial trunk muscles was consistent with this pattern of preparatory motion and with the direction of motion of the centre of mass. In contrast, activation of the deep abdominal muscles was independent of the direction of Limb motion, suggesting a non-direction specific contribution to spinal stability. The results support the opinion that feedforward postural responses result in trunk Movements, and that orientation of the trunk and centre of mass are both controlled variables in relation to rapid Limb Movements.

  • Relationship between Limb Movement speed and associated contraction of the trunk muscles
    Ergonomics, 1997
    Co-Authors: Paul W. Hodges, Carolyn A Richardson
    Abstract:

    Rapid shoulder Movement is preceded by contraction of the abdominal muscles to prepare the body for the expected disturbance to postural equilibrium and spinal stability provoked by the reactive forces resulting from the Movement. The magnitude of the reactive forces is proportional to the inertia of the Limb. The aim of the study was to investigate if changes in the reaction time latency of the abdominal muscles was associated with variation in the magnitude of the reactive forces resulting from variation in Limb speed. Fifteen participants performed shoulder flexion at three different speeds (fast, natural and slow). The onset of EMG of the abdominal muscles, erector spinae and anterior deltoid (AD) was recorded using a combination of fine-wire and surface electrodes. Mean and peak velocity was recorded for each Limb Movement speed for five participants. The onset of transversus abdominis (TrA) EMG preceded the onset of AD in only the fast Movement condition. No significant difference in reaction time latency was recorded between the fast and natural speed conditions for all muscles. The reaction time of each of the abdominal muscles relative to AD was significantly delayed with the slow Movement compared to the other two speeds. The results indicate that the reaction time latency of the trunk muscles is influenced by Limb inertia only with Limb Movement below a threshold velocity.

Alf Thorstensson - One of the best experts on this subject based on the ideXlab platform.

  • Three dimensional preparatory trunk motion precedes asymmetrical upper Limb Movement.
    Gait & posture, 2000
    Co-Authors: Paul W. Hodges, Andrew G. Cresswell, Karl Daggfeldt, Alf Thorstensson
    Abstract:

    Three-dimensional trunk motion, trunk muscle electromyography and intra-abdominal pressure were evaluated to investigate the preparatory control of the trunk associated with voluntary unilateral upper Limb Movement. The directions of angular motion produced by moments reactive to Limb Movement in each direction were predicted using a three-dimensional model of the body. Preparatory motion of the trunk occurred in three dimensions in the directions opposite to the reactive moments. Electromyographic recordings from the superficial trunk muscles were consistent with preparatory trunk motion. However, activation of transversus abdominis was inconsistent with control of direction-specific moments acting on the trunk. The results provide evidence that anticipatory postural adjustments result in Movements and not simple rigidification of the trunk.

  • preparatory trunk motion accompanies rapid upper Limb Movement
    Experimental Brain Research, 1999
    Co-Authors: Paul W. Hodges, Andrew G. Cresswell, Alf Thorstensson
    Abstract:

    Evaluation of trunk Movements, trunk muscle activation, intra-abdominal pressure and displacement of centres of pressure and mass was undertaken to determine whether trunk orientation is a controlled variable prior to and during rapid bilateral Movement of the upper Limbs. Standing subjects performed rapid bilateral symmetrical upper Limb Movements in three directions (flexion, abduction and extension). The results indicated a small (0.4-3.3 degrees) but consistent initial angular displacement between the segments of the trunk in a direction opposite to that produced by the reactive moments resulting from Limb Movement. Phasic activation of superficial trunk muscles was consistent with this pattern of preparatory motion and with the direction of motion of the centre of mass. In contrast, activation of the deep abdominal muscles was independent of the direction of Limb motion, suggesting a non-direction specific contribution to spinal stability. The results support the opinion that feedforward postural responses result in trunk Movements, and that orientation of the trunk and centre of mass are both controlled variables in relation to rapid Limb Movements.

Catherine Mercier - One of the best experts on this subject based on the ideXlab platform.

  • Exploring the relationships between alterations of body image, sense of Limb position and sense of Limb Movement in complex regional pain syndrome
    2019
    Co-Authors: Clémentine Brun, N. Giorgi, Anne-marie Pinard, Martin Gagné, Candida S. Mccabe, Catherine Mercier
    Abstract:

    Chronic pain is often accompanied by patient reported distorted body perception and an altered kinesthesia (referring to the senses of Limb position and Limb Movement), but the association between these deficits is unknown. Objectives: 1- to assess body perception, and the senses of Limb position and Limb Movement in Complex Regional Pain Syndrome (CRPS); 2- to test whether these variables are related to each other and to pain intensity. Thirteen upper Limb CRPS (mean pain intensity: 4.2±2.4/10) and 13 Controls were recruited. Body perception was self- reported with a questionnaire, while the senses of Limb position (Task 1) and of Limb Movement (Task 2) were assessed with a robotic system combined with a 2D virtual reality display. Results show altered kinesthesia in CRPS compared to Controls (all p 0.26). Therefore, the results suggest that kinesthesia and body perception should be considered and evaluated separately in CRPS.

  • Exploring the Relationships Between Altered Body Perception, Limb Position Sense, and Limb Movement Sense in Complex Regional Pain Syndrome
    The Journal of Pain, 2018
    Co-Authors: Clémentine Brun, N. Giorgi, Anne-marie Pinard, Martin Gagné, Candida S. Mccabe, Catherine Mercier
    Abstract:

    Chronic pain is often accompanied by patient-reported distorted body perception and an altered kinesthesia (referring to the senses of Limb position and Limb Movement), but the association between these deficits is unknown. The objectives of this study were to assess body perception and the senses of Limb position and Limb Movement in complex regional pain syndrome (CRPS) and to test whether these variables are related to each other and to pain intensity. Thirteen patients with upper Limb CRPS (mean pain intensity, 4.2 ± 2.4 out of 10) and 13 controls were recruited. Body perception was self-reported with a questionnaire, and the senses of Limb position (task 1) and of Limb Movement (task 2) were assessed with a robotic system combined with a 2D virtual reality display. The results showed altered kinesthesia in the patients with CRPS compared with controls (all P .26). Therefore, the results suggest that kinesthesia and body perception should be considered and evaluated separately in patients with CRPS. PERSPECTIVE: Senses of Limb position and Movement rely on sensorimotor integration. Both are altered in complex regional pain syndrome. However, they are not related to the subjective perception of the painful Limb, and thus they should be assessed separately in rehabilitation.

Andrew G. Cresswell - One of the best experts on this subject based on the ideXlab platform.

  • Three dimensional preparatory trunk motion precedes asymmetrical upper Limb Movement.
    Gait & posture, 2000
    Co-Authors: Paul W. Hodges, Andrew G. Cresswell, Karl Daggfeldt, Alf Thorstensson
    Abstract:

    Three-dimensional trunk motion, trunk muscle electromyography and intra-abdominal pressure were evaluated to investigate the preparatory control of the trunk associated with voluntary unilateral upper Limb Movement. The directions of angular motion produced by moments reactive to Limb Movement in each direction were predicted using a three-dimensional model of the body. Preparatory motion of the trunk occurred in three dimensions in the directions opposite to the reactive moments. Electromyographic recordings from the superficial trunk muscles were consistent with preparatory trunk motion. However, activation of transversus abdominis was inconsistent with control of direction-specific moments acting on the trunk. The results provide evidence that anticipatory postural adjustments result in Movements and not simple rigidification of the trunk.

  • preparatory trunk motion accompanies rapid upper Limb Movement
    Experimental Brain Research, 1999
    Co-Authors: Paul W. Hodges, Andrew G. Cresswell, Alf Thorstensson
    Abstract:

    Evaluation of trunk Movements, trunk muscle activation, intra-abdominal pressure and displacement of centres of pressure and mass was undertaken to determine whether trunk orientation is a controlled variable prior to and during rapid bilateral Movement of the upper Limbs. Standing subjects performed rapid bilateral symmetrical upper Limb Movements in three directions (flexion, abduction and extension). The results indicated a small (0.4-3.3 degrees) but consistent initial angular displacement between the segments of the trunk in a direction opposite to that produced by the reactive moments resulting from Limb Movement. Phasic activation of superficial trunk muscles was consistent with this pattern of preparatory motion and with the direction of motion of the centre of mass. In contrast, activation of the deep abdominal muscles was independent of the direction of Limb motion, suggesting a non-direction specific contribution to spinal stability. The results support the opinion that feedforward postural responses result in trunk Movements, and that orientation of the trunk and centre of mass are both controlled variables in relation to rapid Limb Movements.

Narong Simakajornboon - One of the best experts on this subject based on the ideXlab platform.

  • Improvement of Parasomnias After Treatment of Restless Leg Syndrome/ Periodic Limb Movement Disorder in Children
    Journal of Clinical Sleep Medicine, 2019
    Co-Authors: Neepa Gurbani, Thomas J. Dye, Kyle Dougherty, Sejal V. Jain, Paul S. Horn, Narong Simakajornboon
    Abstract:

    Study Objectives:Previous studies have shown that non-rapid eye Movement (NREM) sleep parasomnias commonly coexist with restless legs syndrome (RLS) and periodic Limb Movement disorder (PLMD) in ch...

  • Periodic Limb Movement disorder in children
    Paediatric Respiratory Reviews, 2006
    Co-Authors: Narong Simakajornboon
    Abstract:

    Periodic Limb Movement disorder (PLMD) has been reported in children and is more prevalent in certain conditions such as attention deficit hyperactivity disorder. The International Restless Legs Syndrome Group has recently developed the criteria for diagnosis of PLMD in children. These criteria include both specific clinical features and polysomnographic findings. Exclusion of other causes especially sleep-disordered breathing is essential. Several medications including benzodiazepine and dopaminergic medication have been used in children, although these medications have not been adequately studied in this age group. Some PLMD children have evidence of low iron storage and response favorably to iron therapy.