Publications by authors named "Maria E Rivas"

Study Design: Retrospective data analysis study.

Objectives: To assess gait recovery rates in subjects with motor incomplete spinal cord injury (SCI) at the start of rehabilitation and to report their gait performance.

Setting: Tertiary inpatient Rehabilitation Center in Argentina.

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Introduction: The effectiveness of physical rehabilitation therapies on patients who required prolonged mechanical ventilation and were discharged from the Intensive Care Unit (ICU) with post-COVID-19 neuromuscular weakness is known in the acute period. The objective of this study was to characterize the functional recovery in people hospitalized with post-ICU neuromuscular weakness due to COVID-19 admitted to rehab.

Methods: Retrospective study which included 42 patients with post-COVID-19 neuromuscular weakness, who were admitted to two tertiary care rehabilitation centers, from April 2020 to April 2022.

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Objectives: To assess the changes in speed, stroke frequency, acceleration, and shoulder range of motion (ROM) associated with different wheelchair axle positions in people with chronic C7 tetraplegia.

Methods: This repeated-measures study was conducted at the Chronic Spinal Cord Injury Unit, FLENI Escobar, Argentina. The speed, stroke frequency, acceleration, and shoulder ROM during wheelchair propulsion were measured in nine participants with C7 spinal cord injury (SCI) in four different axle positions (forward and up, forward and down, backward and down, backward and up).

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Mechanochemical synthesis routes offer a sustainable, simple method for preparing materials. In this work, NiAlO was synthesised by a mechanically activated method using a high-energy planetary mill and a calcination step. This study aims to identify the effect of different milling energies on the phases, chemical environments and surface composition of the material.

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Study Design: Descriptive and ambispective study.

Objectives: To describe the demographics, clinical characteristics, and etiologies of traumatic spinal cord injury (TSCI) in a metropolitan region of Argentina.

Setting: Five inpatient rehabilitation centers in Buenos Aires, Argentina.

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Small pore zeolites have shown great potential in a number of catalytic reactions. While Mo-containing medium pore zeolites have been widely studied for methane dehydroaromatisation (MDA), the use of small pore supports has drawn limited attention due to the fast deactivation of the catalyst. This work investigates the structure of the small pore Mo/H-SSZ-13 during catalyst preparation and reaction by operando X-ray absorption spectroscopy (XAS), in situ synchrotron powder diffraction (SPD), and electron microscopy; then, the results are compared with the medium pore Mo/H-ZSM-5.

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The use of mechanochemistry to prepare catalytic materials is of significant interest; it offers an environmentally beneficial, solvent-free, route and produces highly complex structures of mixed amorphous and crystalline phases. This study reports on the effect of milling atmosphere, either air or argon, on mechanochemically prepared LaMnO3 and the catalytic performance towards N2O decomposition (deN2O). In this work, high energy resolution fluorescence detection (HERFD), X-ray absorption near edge structure (XANES), X-ray emission, and X-ray photoelectron spectroscopy (XPS) have been used to probe the electronic structural properties of the mechanochemically prepared materials.

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Mechanochemistry offers a solventless, 'waste free' route to preparing metal oxide catalysts, however, there is limited information on the chemical steps involved. In this work, the perovskite LaMnO has been successfully synthesized via mechanochemistry from metal oxide powders, LaO and MnO, at room temperature, using a planetary ball mill. Separate ex situ'time slices' were taken during the milling procedure to provide insights into the underlying chemistry.

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[Purpose] This study aimed to determine the predictive values of the trunk control test (TCT) and functional ambulation category (FAC) for independent walking up to 6 months post stroke. [Subjects] Twenty-seven subjects with hemiplegia secondary to a unilateral hemisphere stroke were included. [Methods] The protocol was started at 45 days post stroke, with the TCT and FAC as walking predictors.

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Research Design: Analysis of inter-rater reliability and concurrent validity.

Objective: To determine measurement properties of a Spanish version of The Coma Recovery Scale-Revised (CRS-R).

Methods And Procedures: A sample of 35 in-patients with severe acquired brain injury.

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Stroke survivors present a less efficient gait compared to healthy subjects due to abnormal knee flexion during the swing phase of gait, associated with spasticity of the rectus femoris muscle and overactivity of the ankle plantarflexors. It is relevant to understand the effect of the ankle foot orthosis (AFO) on gait in individuals with plantarflexor spasticity. The aim of this study was to compare the knee kinematics with an AFO/footwear combination and barefoot in post-stroke subjects with plantarflexor spasticity.

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Research Design: Retrospective observational study.

Objective: To compare motor variables between patients with severe traumatic brain injury who emerge and patients who do not emerge from vegetative state, in an attempt to identify early motor manifestations associated with consistent patient improvement.

Methods And Procedures: Patients were divided into two groups: group 1, patients who emerged from vegetative state attaining at least a state of functional interactive communication and/or functional use of two different objects (n = 8); and group 2, patients who did not emerge (n = 7).

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Study Design: Psychometric testing of a translated, culturally adapted questionnaire.

Objective: Argentinean Roland-Morris Disability Questionnaire (RMDQ) validation and cross-cultural adaptation for its use in Argentinean population with lumbar pain.

Summary Of Background Data: The RMDQ is one of the most widely used and validated instruments for measuring disability in low back pain.

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