603 Development of measurement system using induction equipment for postural reflex response

Gaps in the recruitment of postural muscles to correct body sway may be a limiting factor in the rehabilitation of patients with stroke. The purpose of this study was to determine how the onset of a postural reflex compares to the conscious identification of body sway in patients with hemiplegia and in a comparison group of able-bodied subjects. All subjects stood on a movable force platform that was unexpectedly displaced backwards inducing a forward body sway. The excursion and velocity of the platform displacements were varied systematically and the frequency of activation of postural muscles was recorded. A hand held response key was used to measure the time required to react to the postural disturbance (RT). In addition, the onset time of a long-loop “stretch” reflex was measured in the gastrocnemius muscles bilaterally. Subjects with hemiplegia failed to recruit a reflex response in 53% of the trials, whereas able-bodied subjects had an absent response in only 3% of the trials. The upper extremity RT for subjects with hemiplegia was not significantly delayed compared to able-bodied subjects, and the onset of a stretch reflex response in the gastrocnemius muscles was not different between groups. In addition, there was no correlation between reflex onset and conscious reaction time for control or disabled groups. These results have implications for the practice of occupational therapy because lower extremity recruitment deficits may persist and require treatment even though the recognition of body sway and the onset of reflex muscle discharge (when recruited) was similar to that of able-bodied subjects.

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3117 Development of induction device with pneumatic cylinders for postural reflex response

The proceedings of the JSME annual meeting ◽

10.1299/jsmemecjo.2006.2.0_337 ◽

2006 ◽

Vol 2006.2 (0) ◽

pp. 337-338

Author(s):

Tatsuya OKUNAKA ◽

Shinichiro YAMAMOTO ◽

Yukio KAWAKAMI

Keyword(s):

Reflex Response ◽

Postural Reflex ◽

Pneumatic Cylinders

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A bio-inspired neuromuscular model to simulate the neuro-sensorimotor basis for postural-reflex-response in humans

2012 4th IEEE RAS & EMBS International Conference on Biomedical Robotics and Biomechatronics (BioRob) ◽

10.1109/biorob.2012.6290931 ◽

2012 ◽

Cited By ~ 2

Author(s):

Fady Alnajjar ◽

Tytus Wojtara ◽

Shingo Shimoda ◽

Hidenori Kimura

Keyword(s):

Reflex Response ◽

Postural Reflex

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Alterations in the number of motoneurons containing immunoreactive calcitonin gene-related peptide(CGRP)& choline acetyltransferase(ChAT) in the cervical spinal cord of the wobbler mouse during the development of the motoneuron disease

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100141226 ◽

1995 ◽

Vol 53 ◽

pp. 970-971

Author(s):

L. Vacca-Galloway ◽

Y.Q. Zhang ◽

P. Bose ◽

S.H. Zhang

Keyword(s):

Spinal Cord ◽

Early Stage ◽

Cervical Spinal Cord ◽

Wild Type Mouse ◽

Reflex Response ◽

Mouse Strains ◽

Behavioral Tests ◽

Wobbler Mouse ◽

Stage 4 ◽

Stage 1

The Wobbler mouse (wr) has been studied as a model for inherited human motoneuron diseases (MNDs). Using behavioral tests for forelimb power, walking, climbing, and the “clasp-like reflex” response, the progress of the MND can be categorized into early (Stage 1, age 21 days) and late (Stage 4, age 3 months) stages. Age-and sex-matched normal phenotype littermates (NFR/wr) were used as controls (Stage 0), as well as mice from two related wild-type mouse strains: NFR/N and a C57BI/6N. Using behavioral tests, we also detected pre-symptomatic Wobblers at postnatal ages 7 and 14 days. The mice were anesthetized and perfusion-fixed for immunocytochemical (ICC) of CGRP and ChAT in the spinal cord (C3 to C5).Using computerized morphomety (Vidas, Zeiss), the numbers of IR-CGRP labelled motoneurons were significantly lower in 14 day old Wobbler specimens compared with the controls (Fig. 1). The same trend was observed at 21 days (Stage 1) and 3 months (Stage 4). The IR-CGRP-containing motoneurons in the Wobbler specimens declined progressively with age.

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