ISABEL DE CAMARGO NEVES SACCO
Projetos de Pesquisa
Unidades Organizacionais
Departamento de Fisioterapia, Fonoaudiologia e Terapia Ocupacional, Faculdade de Medicina - Docente
LIM/54 - Laboratório de Bacteriologia, Hospital das Clínicas, Faculdade de Medicina - Líder
LIM/54 - Laboratório de Bacteriologia, Hospital das Clínicas, Faculdade de Medicina - Líder
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conferenceObject Wavelet approach for studying motor strategy patterns of diabetic neuropathic individuals in gait cycle(2014) PACHI, C. G. F.; WEIDERPASS, H. A.; YAMAMOTO, J. F.; SACCO, I. C. N.; HAMAMOTO, A.; ONODERA, A. N.The aim of this study was to investigate lower limb muscle's energy patterns and spectral properties of diabetic neuropathic individuals during gait cycle using wavelet approach. The signal's energy and frequency were compared between groups in the whole gait cycle and in specific frequency band (7-542 Hz) using t tests. Principal component analysis was used to assess differences between diabetic and non-diabetic EMG patterns. The diabetic individuals displayed lesser energies in lower frequency bands for all muscles and higher energies in higher-frequency bands in the extensors' muscles. Future studies are important if we consider that by identifying these biomechanical changes in early stages of establishment of neuropathy, it could be possible to develop therapeutic and prophylactic prevention of ulcers and subsequent amputations.- Dynamic simulation of hip strategy of diabetic neuropathic individuals during gait(2014) GOMES, Aline A.; FORNER-CORDERO, Arturo; ACKERMANN, Marko; SACCO, Isabel C. N.Patients suffering from diabetic neuropathy present disturbed kinetic, kinematic and electromyographic gait patterns. These disturbances have been experimentally related with plantar ulcerations. However, experimental data are limited because it is not possible to record certain muscle groups (e.g, illiopsoas). In this respect, computational simulations complement the experiments. Our aim is to simulate how the neuromusculoskeletal system of diabetic neuropathic individuals deals with a reduced distal muscle function during level gait. It was hypothesized that proximal muscle compensates the reduced distal muscle function. We used a seven segment planar musculoskeletal model of the body with 8 muscles in each leg. Normal gait muscle excitation patterns were used as reference input in forward dynamics simulations. In order to simulate the neuropathic gait condition, those reference excitations were modified according to functional changes found in diabetic gait. The tibialis anterior (3,75%) and gastrocnemius (15%) excitation reduction along with iliopsoas (11,25%) and hamstrings (7,5%) excitation increase during push-off, guaranteed larger pre-swing hip flexion and smaller hip extension during stance. This motion pattern was not observed when hamstrings excitation remained unchanged. Ankle plantar-flexion during push-off and ankle flexion during swing decreased as the gastrocnemius and tibialis were functionally reduced. The musculoskeletal model was able to represent the hip strategy possibly adopted by the diabetic neuropathic patients during gait as an adaptation to loss of function in distal muscles. The increase in hamstrings function is crucial to improve the model dynamic stability opening new approaches to therapeutic handling of these patients.
conferenceObject Comparison between some time-frequency analysis methods on electromyography (EMG) signal(2012) WEIDERPASS, H. A.; PACHI, C. G. F.; YAMAMOTO, J. F.; SACCO, I. C. N.; HAMAMOTO, A.; ONODERA, A. N.There are several researches about an efficient method for the analysis and classification of electromyography (EMG) signals and using of wavelets is a promising approach for determining the spectral distribution of the signal intensity at any time. This study compared some time-frequency analysis methods for investigating the EMG activity of the thigh and calf muscles during gait among non-diabetic subjects and diabetic neuropathic patients and, using Adaptive Optimal Kernel (AOK) and Discrete Wavelet Transform (DWT) it also attempted to verify if there are EMG alterations in lower limbs muscles during gait related to the diabetic neuropathy.