Navegando por Orientadores "CALLEGARI, Bianca"

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Acesso aberto (Open Access)
Seleção automatizada de séries temporais inerciais do teste de sentar e levantar: um estudo metodológico
(Universidade Federal do Pará, 2023-07-27) ASSIS, Jéssica Cristina Santos de; CALLEGARI, Bianca; http://lattes.cnpq.br/0881363487176703; https://orcid.org/0000-0001-9151-3896
This is a quantitative research, of an exploratory nature, conducted through a survey, subjects participated in the study, of both sexes and who were able to perform the 30-second sit and stand test. The objective of this study was to create an algorithm capable of automatically segmenting and identifying a sit-to-stand cycle and analyzing the similarity between the curves obtained by the smartphone and curves previously recorded by kinematography. Thus, the study was divided into two stages: stage (i) creation of the template through kinematic recordings of acceleration from the sit-to-stand test; step (ii) automated identification of the cycles recorded by the smartphone, and finally, analyze the similarity between the curves through two metrics of similarity, cross-correlation and Euclidean distance. A total of 3749 cycles were segmented, and only 3492 were considered for analysis. The preliminary result showed that there was no significant difference between the cycle counting methods (p=0.96) and that the mean similarityof the cycles studied with the template was euclidean distance (DE de 40.2 ± 8.29) e de cross-correlation (CC de 0.64 ± 0.13). The correlation between CC and DD metrics was inverse and -0.81 (p <0.0001). The cutoff points established from the cumulative distribution returned similarity indicator values related to the percentage above or below the cutoff. For example, for a cutoff of 80%, CC 0,71±0,06 (20% of curves above this value) and DE 35.3±3.99 (80% of curves below this value) were obtained. When the cutoff point was raised to 90%, CC 0,74±0,05 (10% of curves above this value) and DE 33.4±3.85 (10% of curves below this value) were obtained.
Acesso aberto (Open Access)
Uso de um acelerômetro para avaliação de ajustes posturais antecipatórios durante início do passo em pacientes com osteoartrite de joelho
(Universidade Federal do Pará, 2023-02-24) OLIVEIRA, Luana Karine Resende; CALLEGARI, Bianca; http://lattes.cnpq.br/0881363487176703; https://orcid.org/0000-0001-9151-3896
Introduction: Elderly people with severe and moderate levels of Knee Osteoarthritis (OA) have an adaptive strategy to perform gait initiation, which is significantly altered by the level of severity of knee osteoarthritis. In recent years, inertial sensors have been used to assess anticipatory postural adjustments (APAs) for gait initiation, since kinemetry, considered the gold standard, is expensive, difficult to transport, requires calibration and proper installation, becoming its use in clinical settings is unfeasible. There are no studies in the literature that validated the use of accelerometers to assess gait initiation in individuals with Knee OA, nor did they assess their reliability, a fact that reinforces the need for research development in this area with this objective. We also did not find clinical trials in the literature that have evaluated the impact of physiotherapeutic interventions on anticipatory step adjustments. Objective: This project is divided into two studies: Study 1: sought to validate the use of a commercial Metamotion C accelerometer to measure APAs during gait initiation in individuals with Knee Osteoarthritis, as well as to test its reliability. Study 2: will seek to assess whether the use of virtual reality with video game resources, associated with conventional physical therapy treatment, have superior effects on pain, physical capacity, balance and anticipatory postural adjustments in gait initiation in individuals with knee OA. Materials and methods: Study 1: 29 subjects were evaluated using a commercial Metamotion C accelerometer and a camera system – kinemetry with a reflective marker on the lumbar vertebrae and calcaneus. The subjects started the step after the experimenter's random command, and had variables extracted from the protocol: APAlatency, APAamp. Study 2: This is a single-blind, randomized, controlled clinical trial. 40 subjects (31 women and 9 men) were selected and randomized into the TC or VR groups by random allocation (20 in each group). The patients underwent the rehabilitation program for 8 consecutive weeks. An inertial sensor was used during the beginning of the gait to measure the APAs and tests, scales and questionnaires to assess balance, pain and physical capacity. Results: Study 1: there was a statistically significant linear correlation between all variables. The APAlatency variable showed an almost perfect correlation (r = 0.9715; p < 0.00001) and the APAamp variable (r = 0.7358; p < 0.00001) had a strong correlation. The measurements showed high to very high reliability for intraclass correlation for the kinematics and accelerometer amplitude and latency variables. Study 2: The results show that conventional treatment significantly improves pain complaints, physical capacity and balance in individuals with knee AO, but only the group that used associated VR showed improvement in PA parameters. Conclusion: Study 1: Metamotion C is valid and presents high reliability for the evaluation of APAs at step initiation in individuals with knee OA. Study 2: only the group VR showed improvement in APA parameters, demonstrating the importance of using this resource in the rehabilitation of these patients.
Acesso aberto (Open Access)
Validação de dispositivos móveis para avaliação de ajustes posturais antecipatórios e compensatórios
(Universidade Federal do Pará, 2021-12-09) DUARTE, Manuela Brito; CALLEGARI, Bianca; http://lattes.cnpq.br/0881363487176703; https://orcid.org/0000-0001-9151-3896
Article 1: Postural adjustments are triggered by the central nervous system in response to external disturbances and consist of anticipatory (APAs) or compensatory (CPAs) adjustments. APAs are muscle recruitment, associated or not with the displacement of the Center of Pressure, in advance of predictable disturbances. CPAs, on the other hand, are generated as a result of the imbalance, after the disturbance. Currently, the study of APA and CPA is restricted to research laboratories due to the need for specific equipment, difficult to handle and high cost. The objective of this project was to validate a mobile application (Momentum) for the evaluation of APAs and CPAs. Healthy young people were subjected to a predictable external disturbance produced by the impact of a pendulum. We used gold standard equipment to compare the results obtained by Momentum. Validation results, APA latency (APAonset), maximum peak (ACCpeaktime) and acceleration variation (ACCpeak) after impact and time to peak (ACCpeak) were the parameters that showed the strongest correlation indices. (r). In terms of reliability, Momentum had a very high correlation in APAonset and APAamp. In the CPA, only the ACCrange had an excellent correlation, the other parameters presented a reasonable to high correlation. In general, Momentum proved to be valid and reliable for evaluating APAs and CPAs. Article 2: New technologies mainly in the sports environment where performance and competitive power are essential, the use of inertial sensors for analysis and evaluation in sports stands out, as long as they are reliable to the gold standard evaluation equipment. The objective of this article was to validate the acceleration signals of the center of mass (COM) in the anticipatory and compensatory phase of the disturbance comparing the two equipments (Metamotion C and kinematics). Twenty healthy young men were exposed to the pendulum paradigm, which consisted of predictable anteroposterior disturbances provoked at the level of the shoulders. The validation results showed a significant linear correlation of all variables from moderate to large with r ≥ 0.5. Reliability between kinematics sessions was excellent (≥0.75). The APAonset variable presented a reasonable to high ICC, while the CPAtime showed an excellent correlation. The results show that Metamotion C proved to be reliable and valid in measuring COM acceleration in both APA and CPA.