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Papers by andre gustavo andrade

No experimento que compoe o capitulo II, avaliaram-se 39 equinos adultos (29 machos e 10 femeas),... more No experimento que compoe o capitulo II, avaliaram-se 39 equinos adultos (29 machos e 10 femeas), campeoes ou reservados campeoes de andamento em exposicoes nacionais das racas Campolina, Mangalarga, Mangalarga Marchador e Pampa, cujas imagens digitalizadas de oito ângulos dos membros foram utilizadas para caracterizar o padrao do andamento dessas racas e para comparar os algoritmos multi-objetivo (MOBJ) e back-propagation (BP) em um sistema de Redes Neurais Artificiais aplicadas para identificacao racial. O padrao de movimento de cada animal foi identificado em ciclo de tres passadas e, como informacao de entrada para as Redes Neurais Artificiais, foi utilizada a variavel delta, calculada como a diferenca entre os valores maximo e minimo de cada ângulo. As imagens foram obtidas por câmera comfrequencia de aquisicao de 200 Hz, conectada a um computador e digitalizadas por meio do aplicativo Simi Motion 3D, versao 7.2. As rotinas, implementadas em ambiente Matlab 7.0, foram executada...

Journal of Physical Education

A avaliação do desempenho físico de atletas é um dos complexos processos que envolvem o treinamen... more A avaliação do desempenho físico de atletas é um dos complexos processos que envolvem o treinamento esportivo. O objetivo deste estudo foi verificar o efeito de três diferentes pausas (15, 30 e 60 segundos) entre as tentativas do teste de salto com contramovimento (SCM) de atletas nacionais do Centro de Treinamento esportivo da UFMG. A amostra foi composta por 12 atletas que participaram de cinco sessões: 2 familiarizações e 3 de protocolo experimental. O protocolo experimental consistiu de três sessões de teste de 15 SCM aleatorizado entre as diferentes pausas entre tentativas (15, 30 e 60 segundos). Não houve diferença significativa para a altura do salto entre os três protocolos de pausa adotados e entre as 15 tentativas de salto no mesmo protocolo. Estes resultados sugerem que, durações de pausas menores, como a de 15 segundos, são suficientes para a manutenção do desempenho em testes de SCM com uma série única de até 15 tentativas. Palavras-chave: Recuperação.Avaliação física. Desempenho esportivo.Familiarização.

International Journal of Clinical and Experimental Physiology, 2020

Background and Aim: In everyday practice, the anthropometric assessment including measures of ski... more Background and Aim: In everyday practice, the anthropometric assessment including measures of skinfolds and body girths must be performed avoiding previous physical exercise. However, few studies are conducted using situations with ecological validity. Thereby, this study aimed to compare if 10k treadmill run alters skinfold measures and body girths of runners. Methods: Eighteen runners of both sexes and levels (34 ± 6 years old with 8 ± 7 years of run practice and 63.6 ± 8.8 ml*kg-1*min-1 of VO 2 max) underwent body girths, skinfolds thickness and body weight assessments before and after the 10k run. The anthropometric parameters were compared by Student's t-Test dependent for paired samples and correlations between body weight reduction and anthropometric parameters were compared by Pearson's correlation coefficient with α= 5%. Results: The 10k run reduces 1.4% of body weight. However, no significant changes were observed in the sum of skinfold thickness or body girths. The percentage of body weight reduction also was not correlated with the exercise-induced changes in skinfold thickness and body girths. Conclusion: Although 10k run causes a body weight reduction, the skinfold thickness and body girths not altered in previously trained individuals and was not correlated with body weight reductions. In this way, the use of these anthropometric assessment techniques can occur both before and after a conventional training session in runners.

Perceptual and motor skills, 2017

Space creation dynamics (SCDs) describe actions players perform to create a scoring opportunity. ... more Space creation dynamics (SCDs) describe actions players perform to create a scoring opportunity. This study compared SCDs and types of offense during three different three versus three (3vs.3) basketball small-sided games (SSGs) played in half court: 3vs.3 with man-to-man defense in half playing area (3vs.3HALF), 3vs.3 with man-to-man defense in full playing area (3vs.3FULL), and 3vs.3 with reduced shot clock (3vs.3RT). We also investigated the efficacy of SCDs in all SSGs and the reliability of SCDs in 3vs.3HALF. While the efficacy of SCDs did not differ among these SSGs, 3vs.3RT presented significantly more "space creation with ball dribbled" and "shot clock violations," and less "on ball screens." 3vs.3FULL presented no differences in the SCDs and types of offense compared with 3vs.3HALF. Reliability within 3vs.3HALF was higher for "space creation with ball dribbled," "space creation without the ball," "set…

Brazilian journal of physical therapy, Jan 22, 2016

Background Stretching exercises are able to promote adaptations in the muscle-tendon unit (MTU), ... more Background Stretching exercises are able to promote adaptations in the muscle-tendon unit (MTU), which can be tested through physiological and biomechanical variables. Identifying the key variables in MTU adaptations is crucial to improvements in training. Objective To perform an exploratory factor analysis (EFA) involving the variables often used to evaluate the response of the MTU to stretching exercises. Method Maximum joint range of motion (ROMMAX), ROM at first sensation of stretching (FSTROM), peak torque (torqueMAX), passive stiffness, normalized stiffness, passive energy, and normalized energy were investigated in 36 participants during passive knee extension on an isokinetic dynamometer. Stiffness and energy values were normalized by the muscle cross-sectional area and their passive mode assured by monitoring the EMG activity. Results EFA revealed two major factors that explained 89.68% of the total variance: 53.13% was explained by the variables torqueMAX, passive stiffnes...

Journal of Strength and Conditioning Research, 2013

Assessment of lower extremity bilateral asymmetries in soccer players is important for both injur... more Assessment of lower extremity bilateral asymmetries in soccer players is important for both injury prevention and performance. The purpose of this investigation was to compare isokinetic knee extensor assessment of asymmetry with a more specific countermovement jump (CMJ). Forty-six Brazilian male professional soccer players participated in this study. The maximal power, maximal force and impulse were determined during CMJ and the total work and peak torque at 60, 180, and 3008$s 21 during isokinetic leg extension, separately for each leg. Factor analysis was performed for all investigated variables, and the diagnostic concordance between different criteria was analyzed by McNemar's x 2 test. The factor analysis showed that the isokinetic and CMJ tests were widely independent methods for the assessment of bilateral differences. Concordance of the diagnostic information could only be found between the maximal force during CMJ and the total work and peak torque at 180 and 3008$s 21 during isokinetic leg extension. Impulse and maximal power during CMJ on a double force platform appear to be appropriate additional variables for the identification of bilateral differences. Therefore, it might be pertinent to perform, in addition to isokinetic assessment, a vertical jump test on a force platform to assure widespread and reliable diagnostic information.

Computer Methods in Biomechanics and Biomedical Engineering, 2013

The aim of this study was to present a new training algorithm using artificial neural networks ca... more The aim of this study was to present a new training algorithm using artificial neural networks called multi-objective least absolute shrinkage and selection operator (MOBJ-LASSO) applied to the classification of dynamic gait patterns. The movement pattern is identified by 20 characteristics from the three components of the ground reaction force which are used as input information for the neural networks in gender-specific gait classification. The classification performance between MOBJ-LASSO (97.4%) and multi-objective algorithm (MOBJ) (97.1%) is similar, but the MOBJ-LASSO algorithm achieved more improved results than the MOBJ because it is able to eliminate the inputs and automatically select the parameters of the neural network. Thus, it is an effective tool for data mining using neural networks. From 20 inputs used for training, MOBJ-LASSO selected the first and second peaks of the vertical force and the force peak in the antero-posterior direction as the variables that classify the gait patterns of the different genders.

JCSM Rapid Communications, 2018

Aims Facioscapulohumeral muscular dystrophy (FSHD) causes progressive muscle weakness and loss. T... more Aims Facioscapulohumeral muscular dystrophy (FSHD) causes progressive muscle weakness and loss. This study aims to compare changes in quadriceps oxygenation and hemodynamics during maximal voluntary quadriceps isometric contraction (MVC Q) and to determine the relationships between these parameters and systemic oxidative stress markers and muscle structural parameters and muscle volume in patients with FSHD and healthy controls. Methods and results 17 patients with FSHD and 14 sedentary healthy controls were matched for age and physical activity level. Blood antioxidant status and stress markers were evaluated. The quadriceps tissue oxygenation index was evaluated by near infrared spectroscopy during MVC Q. Quadriceps volume was determined by magnetic resonance imaging. Quadriceps muscle samples were obtained to evaluate muscle fiber typology and mitochondria morphology by transmission electron microcopy (TEM). Groups were compared by the unpaired Student t-test or by the non-parametric Kruskal-Wallis test in case of skewed distributions with p<0.05. Associations were assessed by Spearman correlations. Compared to controls, patients with FSHD displayed a significantly lower local O 2 consumption per second that was correlated with significantly lower MVC Q and systemic oxidative stress marker levels. Although no difference in muscle typology was observed between groups, TEM showed abnormal aggregation of mitochondria near blood capillaries in FSHD muscles. Conclusions These results suggest that patients with FSHD have a lower O 2 demand during MVC Q and that TOI measured by NIRS during MVC could be useful to determine the muscle oxidative capacity. Furthermore, these adaptations are related to the muscle structure reorganization linked to the occurrence of oxidative stress.

The aim of this study was to verify the validity and reliability of the Microsoft Kinect® as a to... more The aim of this study was to verify the validity and reliability of the Microsoft Kinect® as a tool to analyze the time of the frontal kick of the Taekwondo (ap chagui). The volunteers performed 15 repetitions of this kick while the execution time data was been obtained, simultaneity, by the Microsoft Kinect® and the OptiTrack System (golden pattern). In order to verify the reliability of the durations of the kicks we calculated the Intraclass Correlation Coefficient (ICC3,k) between execution times found for each system. The Pearson Correlation was used to test the concurrent validity. The results of ICC and r Pearson presented in this study indicate that the Microsoft Kinect®, associated with a tracking algorithm, could be a feasible tool to evaluate the execution time of the frontal kick of the Taekwondo (ap-chagui).

Perceptual and Motor Skills, 2014

The effects of two different bandwidths of information of Knowledge of Results (KR) were investig... more The effects of two different bandwidths of information of Knowledge of Results (KR) were investigated. 54 university students participated. The experiment consisted of an acquisition phase with practice of throwing a saloon dart as accurately as possible at a target lying on the floor 2.5 meters away until a specific area of the target was hit three trials in a row. Narrow bandwidth and Wide bandwidth groups received KR when performance was outside the bandwidth. A Control group received KR after every trial. A transfer test was run 10 min. later with 10 more trials and the target 3.0 m away, with no KR. Analyses showed that narrow KR bandwidth was associated with better learning of real world tasks.

Aims Facioscapulohumeral muscular dystrophy (FSHD) causes progressive muscle weakness and loss. T... more Aims Facioscapulohumeral muscular dystrophy (FSHD) causes progressive muscle weakness and loss. This study aims to compare changes in quadriceps oxygenation and hemodynamics during maximal voluntary quadriceps isometric contraction (MVC Q) and to determine the relationships between these parameters and systemic oxidative stress markers and muscle structural parameters and muscle volume in patients with FSHD and healthy controls. Methods and results 17 patients with FSHD and 14 sedentary healthy controls were matched for age and physical activity level. Blood antioxidant status and stress markers were evaluated. The quadriceps tissue oxygenation index was evaluated by near infrared spectroscopy during MVC Q. Quadriceps volume was determined by magnetic resonance imaging. Quadriceps muscle samples were obtained to evaluate muscle fiber typology and mitochondria morphology by transmission electron microcopy (TEM). Groups were compared by the unpaired Student t‐test or by the non‐parametric Kruskal ‐ Wallis test in case of skewed distributions with p<0.05. Associations were assessed by Spearman correlations. Compared to controls, patients with FSHD displayed a significantly lower local O 2 consumption per second that was correlated with significantly lower MVC Q and systemic oxidative stress marker levels. Although no difference in muscle typology was observed between groups, TEM showed abnormal aggregation of mitochondria near blood capillaries in FSHD muscles. Conclusions These results suggest that patients with FSHD have a lower O 2 demand during MVC Q and that TOI measured by NIRS during MVC could be useful to determine the muscle oxidative capacity. Furthermore, these adaptations are related to the muscle structure reorganization linked to the occurrence of oxidative stress.

Computer Methods in Biomechanics and Biomedical Engineering, 2013

Journal of Physical Education

International Journal of Clinical and Experimental Physiology, 2020

Perceptual and motor skills, 2017

Brazilian journal of physical therapy, Jan 22, 2016

Journal of Strength and Conditioning Research, 2013

Computer Methods in Biomechanics and Biomedical Engineering, 2013

JCSM Rapid Communications, 2018

Perceptual and Motor Skills, 2014

Aims Facioscapulohumeral muscular dystrophy (FSHD) causes progressive muscle weakness and loss. T... more Aims Facioscapulohumeral muscular dystrophy (FSHD) causes progressive muscle weakness and loss. This study aims to compare changes in quadriceps oxygenation and hemodynamics during maximal voluntary quadriceps isometric contraction (MVC Q) and to determine the relationships between these parameters and systemic oxidative stress markers and muscle structural parameters and muscle volume in patients with FSHD and healthy controls. Methods and results 17 patients with FSHD and 14 sedentary healthy controls were matched for age and physical activity level. Blood antioxidant status and stress markers were evaluated. The quadriceps tissue oxygenation index was evaluated by near infrared spectroscopy during MVC Q. Quadriceps volume was determined by magnetic resonance imaging. Quadriceps muscle samples were obtained to evaluate muscle fiber typology and mitochondria morphology by transmission electron microcopy (TEM). Groups were compared by the unpaired Student t‐test or by the non‐parametric Kruskal ‐ Wallis test in case of skewed distributions with p<0.05. Associations were assessed by Spearman correlations. Compared to controls, patients with FSHD displayed a significantly lower local O 2 consumption per second that was correlated with significantly lower MVC Q and systemic oxidative stress marker levels. Although no difference in muscle typology was observed between groups, TEM showed abnormal aggregation of mitochondria near blood capillaries in FSHD muscles. Conclusions These results suggest that patients with FSHD have a lower O 2 demand during MVC Q and that TOI measured by NIRS during MVC could be useful to determine the muscle oxidative capacity. Furthermore, these adaptations are related to the muscle structure reorganization linked to the occurrence of oxidative stress.

Computer Methods in Biomechanics and Biomedical Engineering, 2013