Fabiano Politti - Academia.edu (original) (raw)
Papers by Fabiano Politti
Revista Brasileira De Medicina Do Esporte, Feb 1, 2019
Introduction: Although sodium bicarbonate (NaHCO3) supplementation has been shown to decrease fat... more Introduction: Although sodium bicarbonate (NaHCO3) supplementation has been shown to decrease fatigue and improve high-intensity exercise performance, the effects on maintenance of isometric contractions are not clear. Objective: To investigate the effect of NaHCO3 on the performance of individuals subjected to a fatigue protocol in an isometric exercise on the isokinetic dynamometer. Methods: Participants were 12 men in a randomized, double-blind, crossover, placebo-controlled trial. Sixteen minutes after the intake of 0.3 g/kg of body mass of NaHCO3 or placebo, the participants performed an isometric fatigue protocol of right knee extension exercises during eight minutes at 70% of maximum voluntary isometric contraction. The fatigue indicator was the time point at which torque was reduced to 50% of the initial value. The length of resistance was assessed by maintaining the task over 50% of the initial torque. Lactate/blood pH concentrations and rate of perceived exertion (RPE) and pain (RPP) indexes were analyzed. The RPE of the session was evaluated 30 minutes after the test. Results: Blood pH was higher in pre-protocol and in the fatigue indicator after NaHCO3 intake, as were the blood lactate concentrations in the fatigue indicator and at the end of the protocol (p<0.001). NaHCO3 supplementation increased the time to fatigue and lessened the rate of decline of isometric peak torque at the end of the protocol (p<0.001). RPE and RPP were smaller at the end of the protocol in the NaHCO3 condition, and the RPE of the session was diminished (p<0.001). Conclusion: NaHCO3 supplementation enhances steady isometric contraction performance and reduces the internal load. Level of Evidence II; Diagnostic studies-Investigation of an examination for diagnosis.
Brazilian Journal of Oral Sciences, Sep 20, 2017
Introduction: Most of the instruments used in Brazil to diagnose Temporomandibular Disorders (TMD... more Introduction: Most of the instruments used in Brazil to diagnose Temporomandibular Disorders (TMD) were developed in another Language. To effectively use instruments that were created in another language, it must be translated into the relevant target language before cross-cultural adaptation. Clinimetric tests should also be performed. Measurement properties consist of quality criteria related to evaluation instruments. These criteria are necessary to determine the quality of the instruments used in Brazil. Objectives: The aim of the present systematic review was to assess the quality of the measurement properties of instruments utilized to diagnose TMD. Methods: Systematic searches were performed of the PUBMED, SCIELO, LILACS and SCIENCE DIRECT databases. Studies addressing questionnaires translated and cross-culturally adapted for use in Brazil were retrieved and the quality of the measurement properties was analyzed using the COSMIN checklist. Results: In the 11 eligible articles, 10 instruments were identified. The studies were evaluated based on their analysis of structural validity, internal consistency, reproducibility (concordance and reliability), responsiveness, ceiling effect and floor effect. None the assessment tools had all its measurement properties tested. Conclusion: The measurement properties of the instruments were not completely tested. Thus, care must be taken when interpreting the scores of these questionnaires.
Journal of Human Sport and Exercise, 2023
The aim of the present study was to determine whether the ingestion of sodium bicarbonate (NaHCO3... more The aim of the present study was to determine whether the ingestion of sodium bicarbonate (NaHCO3) promotes changes in strength, muscle activity, and perceived exertion in trained individuals following high-intensity intermittent exercise. Twelve trained men were enrolled in a randomized, double-blind, crossover study. Each participant underwent two interventions with a 14-day washout period: i) alkalosis (ALK) -administration of gelatinous capsules containing 0.3 g.kg -1 of NaHCO3; ii) placebo (PLA) -administration of capsules containing 0.3 g.kg -1 of calcium carbonate (CaCO3). The outcomes (electromyographic activity of the quadriceps, peak torque, pH, lactate, scales of perceived effort and pain) were collected during a dynamic high-intensity intermittent protocol performed on an isokinetic dynamometer. Repeated-measures ANOVA revealed no differences between conditions for any of the outcomes analysed. Based on the present findings, the ingestion of sodium bicarbonate does not promote changes in muscle activity, strength of the quadriceps, or perceptions of effort and pain in trained individuals during high-intensity intermittent exercise on an isokinetic dynamometer.
Introduction: Fatigue during voluntary muscle contractions is a complex and multifactorial phenom... more Introduction: Fatigue during voluntary muscle contractions is a complex and multifactorial phenomenon associated with central changes and adaptations of the neuromuscular system. Objective: The purpose of this study was to evaluate the fatigue induced by intermittent successive extension of the knee between active and inactive university students. Method: Twenty healthy men (≥18 years), voluntarily participated in this study. To determine the maximum voluntary isometric contraction (MVIC) of the knee extensors muscle group, three sets of isometric contractions of knee extension were performed for five seconds with five minutes of rest between sets. The fatigue protocol consisted of 10 sets of 10 maximal concentric contractions of the extensor on the right knee, performed at 75% of MVIC with an interval of 45”. Results: Significant reductions were observed (p<0.01), both in isometric strength (-34±4%) and the dynamic strength (-40 ± 3%). In addition, the slope of relationship stre...
ERRO RELATIVO MÁXIMO DA ENTROPIA DA AMOSTRA DO SINAL EMG EM FUNÇÃO DE DIFERENTES PARÂMETROS DE ENTRADA m E r
Gait & Posture, Sep 1, 2018
Journal of Physical Therapy Science, 2015
The aim of the present study was to investigate the effects of a single session of transcranial d... more The aim of the present study was to investigate the effects of a single session of transcranial direct current stimulation combined with virtual reality training on the balance of children with cerebral palsy. [Subjetcs and Methods] Children with cerebral palsy between four and 12 years of age were randomly allocated to two groups: an experimental group which performed a single session of mobility training with virtual reality combined with active transcranial direct current stimulation; and a control group which performed a single session of mobility training with virtual reality combined with placebo transcranial direct current stimulation. The children were evaluated before and after the training protocols. Static balance (sway area, displacement, velocity and frequency of oscillations of the center of pressure on the anteroposterior and mediolateral axes) was evaluated using a force plate under four conditions (30-second measurements for each condition): feet on the force plate with the eyes open, and with the eyes closed; feet on a foam mat with the eyes open, and with the eyes closed. [Results] An increase in sway velocity was the only significant difference found. [Conclusion] A single session of anodal transcranial direct current stimulation combined with mobility training elicited to lead to an increase in the body sway velocity of children with cerebral palsy.
The immediate effect of different loads does not alter muscle co-activation of the upper limb in young adults with dyskinetic cerebral palsy
Gait & Posture, Oct 1, 2021
BACKGROUND There is insufficient information on muscle co-activation in the upper limbs to help h... more BACKGROUND There is insufficient information on muscle co-activation in the upper limbs to help healthcare providers develop treatment programs for patients with dyskinetic cerebral palsy (DCP). RESEARCH QUESTION Is the degree of muscle co-activation greater in adults with DCP than in healthy individuals? Does the use of different arm weights modify co-contraction in individuals with PCD? METHODS Fourteen healthy individuals (control group [CG]) and 14 individuals with DCP (dyskinetic group [DG]) participated in the study. The degree of muscle co-activation of the dominant limb during drinking from a mug was compared between the two groups. The task was divided into a going, adjusting, and returning phase. In the DG, an analysis was also performed on using an arm weight during the functional task. The loads corresponded to 10, 20, and 30 % of maximum isometric muscle strength measured in each participant. RESULTS In comparing the two groups, the DG exhibited a greater muscle co-activation in the shoulder and elbow muscles during the going phase, the shoulder, elbow, and wrist during the adjusting phase; and the elbow during the returning phase. The DG also showed a greater mean index of curvature (MIC), time to perform the movement phases, and lesser mean velocity (Vm) to drinking. In analyzing the DG's arm weight, no effect on co-activation, MIC, time to perform the movement phases, and Vm to drinking were found with the loads tested (p > 0.05). CONCLUSION Muscle co-activation is increased in adults with DCP in comparison to healthy individuals. Moreover, arm weight during the functional activity of drinking from a mug did not alter co-activation, although an immediate effect was expected.
Revista Brasileira De Medicina Do Esporte, Feb 1, 2019
Introduction: Although sodium bicarbonate (NaHCO3) supplementation has been shown to decrease fat... more Introduction: Although sodium bicarbonate (NaHCO3) supplementation has been shown to decrease fatigue and improve high-intensity exercise performance, the effects on maintenance of isometric contractions are not clear. Objective: To investigate the effect of NaHCO3 on the performance of individuals subjected to a fatigue protocol in an isometric exercise on the isokinetic dynamometer. Methods: Participants were 12 men in a randomized, double-blind, crossover, placebo-controlled trial. Sixteen minutes after the intake of 0.3 g/kg of body mass of NaHCO3 or placebo, the participants performed an isometric fatigue protocol of right knee extension exercises during eight minutes at 70% of maximum voluntary isometric contraction. The fatigue indicator was the time point at which torque was reduced to 50% of the initial value. The length of resistance was assessed by maintaining the task over 50% of the initial torque. Lactate/blood pH concentrations and rate of perceived exertion (RPE) and pain (RPP) indexes were analyzed. The RPE of the session was evaluated 30 minutes after the test. Results: Blood pH was higher in pre-protocol and in the fatigue indicator after NaHCO3 intake, as were the blood lactate concentrations in the fatigue indicator and at the end of the protocol (p<0.001). NaHCO3 supplementation increased the time to fatigue and lessened the rate of decline of isometric peak torque at the end of the protocol (p<0.001). RPE and RPP were smaller at the end of the protocol in the NaHCO3 condition, and the RPE of the session was diminished (p<0.001). Conclusion: NaHCO3 supplementation enhances steady isometric contraction performance and reduces the internal load. Level of Evidence II; Diagnostic studies-Investigation of an examination for diagnosis.
Revista Brasileira De Medicina Do Esporte, Jul 16, 2018
Introduction: Although sodium bicarbonate (NaHCO3) supplementation has been shown to decrease fat... more Introduction: Although sodium bicarbonate (NaHCO3) supplementation has been shown to decrease fatigue and improve high-intensity exercise performance, the effects on maintenance of isometric contractions are not clear. Objective: To investigate the effect of NaHCO3 on the performance of individuals subjected to a fatigue protocol in an isometric exercise on the isokinetic dynamometer. Methods: Participants were 12 men in a randomized, double-blind, crossover, placebo-controlled trial. Sixteen minutes after the intake of 0.3 g/kg of body mass of NaHCO3 or placebo, the participants performed an isometric fatigue protocol of right knee extension exercises during eight minutes at 70% of maximum voluntary isometric contraction. The fatigue indicator was the time point at which torque was reduced to 50% of the initial value. The length of resistance was assessed by maintaining the task over 50% of the initial torque. Lactate/blood pH concentrations and rate of perceived exertion (RPE) and pain (RPP) indexes were analyzed. The RPE of the session was evaluated 30 minutes after the test. Results: Blood pH was higher in pre-protocol and in the fatigue indicator after NaHCO3 intake, as were the blood lactate concentrations in the fatigue indicator and at the end of the protocol (p<0.001). NaHCO3 supplementation increased the time to fatigue and lessened the rate of decline of isometric peak torque at the end of the protocol (p<0.001). RPE and RPP were smaller at the end of the protocol in the NaHCO3 condition, and the RPE of the session was diminished (p<0.001). Conclusion: NaHCO3 supplementation enhances steady isometric contraction performance and reduces the internal load. Level of Evidence II; Diagnostic studies-Investigation of an examination for diagnosis.
Effect of Transcranial Direct Current Stimulation Combined With Virtual Reality Training on Balance in Children With Cerebral Palsy: A Randomized, Controlled, Double-Blind, Clinical Trial
Journal of Motor Behavior, Sep 20, 2016
ABSTRACT The authors' aim was to investigate the effects of continuous transcranial direct cu... more ABSTRACT The authors' aim was to investigate the effects of continuous transcranial direct current stimulation (tDCS) combined with virtual reality training on static and functional balance in children with cerebral palsy (CP). Twenty children with CP (6 girls and 14 boys; M age = 7 years 6 months ± 2 years) were randomly allocated to two groups. The experimental group received active tDCS and the control group received sham stimulation during the 10 sessions of virtual reality mobility training protocols. The children were evaluated on 3 occasions (preintervention, postintervention, and 1-month follow-up). Static balance was evaluated using a force plate under 4 conditions: feet on force plate with (a) eyes open and (b) with eyes closed, and feet on foam mat with (c) eyes open and (d) with eyes closed. Functional balance was evaluated using the Pediatric Balance Scale and the Timed Up and Go Test. The analyses demonstrated statistically significant postintervention and follow-up effects favoring the experimental group over the control group with regard to the Pediatric Balance Scale, Timed Up and Go Test, and area of oscillation of the center of pressure when standing on the force plate with eyes open. The present findings suggest that tDCS can potentiate the effects of virtual reality training on static and functional balance among children with CP.
Ratio between maximum jaw opening and lateral excursion in Brazilians with and without temporomandibular disorder
ConScientiae Saúde
Introdução: Os movimentos mandibulares (MM) podem oferecer informações importantes sobre a articu... more Introdução: Os movimentos mandibulares (MM) podem oferecer informações importantes sobre a articulação temporomandibular. Objetivo: Avaliar os MM e a relação entre abertura máxima e excursão lateral mandibular em brasileiros com e sem disfunção temporomandibular (DTM). Métodos: Estudo transversal com 801 brasileiros entre cinco e 80 anos. Os indivíduos responderam um questionário de triagem; e os MM foram medidos com paquímetro digital. O teste de Mann-Whitney foi utilizado para comparar diferenças entre sexos e grupos com e sem DTM. O teste de Kruskal-Wallis foi aplicado para determinar diferenças nos MM entre faixas etárias. Resultados: Os MM foram menores nos indivíduos com DTM. A razão entre abertura mandibular e excursão lateral foi de 5,23 em mulheres sem DTM e 5,59 em mulheres com DTM. No homens, a proporção foi de 4,75 e 5,52 em indivíduos sem e com DTM, respectivamente. Conclusão: Os MM são menores em brasileiros com DTM, enquanto que a relação entre abertura mandibular e e...
Multisegmental Kinematic Behavior of Normal and Pronated Feet During the Squat Phase of the Anterior and Lateral Step Down Tests
These data accompanied with the paper "MULTISEGMENTAL KINEMATIC BEHAVIOR OF NORMAL AND PRONA... more These data accompanied with the paper "MULTISEGMENTAL KINEMATIC BEHAVIOR OF NORMAL AND PRONATED FEET DURING THE SQUAT PHASE OF THE ANTERIOR AND LATERAL STEP DOWN TESTS". The aim of the study was to compare the multisegmental kinematic behavior of neutral and pronated feet during the squat phase of the anterior and lateral step down tests. Our hypothesis is that neutral and pronated feet would exhibit different kinematic behaviors during the step down tests based on the analysis of the segments of the tibia, hindfoot and forefoot, as was the case in previous studies that analyzed gait The data were obtained through the kinematic analysis with a three-dimensional system during the execution of two functional tests: Anterior and Lateral Step Down Tests. Using a multisegmental foot model in pronated and neutral foot of health's individuals. The mean for the nine cycles of each variables for the two tasks was calculated and the data were save in excel format. In the data re...
BMC Musculoskeletal Disorders, 2020
Background It is not yet clear which of the various electrophysical modalities used in clinical p... more Background It is not yet clear which of the various electrophysical modalities used in clinical practice is the one that contributes most positively when added to an exercise program in patients with knee osteoarthritis (OA). The aim of the present study was to analyze the clinical effects of the inclusion of interferential current therapy (ICT), shortwave diathermy therapy (SDT) and photobiomodulation (PHOTO) into an exercise program in patients with knee OA. Methods This prospective, five-arm, randomised, placebo-controlled trial was carried out with blinded participants and examiners. We recruited 100 volunteers aged 40 to 80 years with knee OA. Participants were allocated into five groups: exercise, exercise + placebo, exercise + ICT, exercise + SDT, and exercise + PHOTO. The outcome measures included Western Ontario and McMaster Universities (WOMAC), numerical rating pain scale (NRPS), pressure pain threshold (PPT), self-perceived fatigue and sit-to-stand test (STST), which wer...
Gait & Posture, 2018
Background: There is no consensus on kinematics alterations during descending stairs in females w... more Background: There is no consensus on kinematics alterations during descending stairs in females with patellofemoral pain (PFP). In addition, there are no studies that have evaluated the three dimensional kinematics of the trunk, pelvis, hip, knee, and ankle using a multi-segmental model of the foot simultaneously during this task in patients with PFP and evaluated the subphases of stair descent. The objectives of this study were to compare the three dimensional kinematics of the trunk, pelvis, and lower limbs during different subphases of stair descent and identify the discriminatory capacity of the kinematic variables among women with PFP and healthy women. Methods: In this cross-sectional study, thirty-four women with PFP and thirty-four pain free women between 18 and 35 years-old were submitted to three-dimensional kinematic evaluation during stair descent. Results: It was observed that kinematic differences between the groups occurred in the first double support phase of the stair descent, with the variables of internal rotation of the hindfoot in relation to the tibia in the initial contact (2.1°; sensitivity = 68.6%, specificity = 61.8%) and contralateral pelvic drop in load response (1.3°, sensitivity = 65.7%, specificity = 63.7%) presenting the best ability to discriminate women with and without PFP. Conclusion: Our results suggest that kinematic changes during stair descent should be used with caution during the evaluation and decision-making process in women with PFP.
Motriz: Revista de Educação Física, 2019
To determine how EMG, anthropometric, and psychological factors, and physical activity levels aff... more To determine how EMG, anthropometric, and psychological factors, and physical activity levels affect isokinetic peak torque performance (IPT) of multiple set exercise sessions. Methods: 20 participants (27±7 years old), classified as active (A=10) and inactive (I=10), performed 10x10:40secs of maximal unilateral knee flexions and extensions at 120o.s-1. The IPT, EMG, glucose, LDH, and lactate concentrations and perceptions of pain, effort, recovery. Results: Active volunteers showed higher muscularity (52±5 vs 47±4 cm; p<0.05), PTI (262±4 vs 185±4 Nm; p<0.05), relative lower drop in performance (14±2 vs 27±3% ; p<0.05), major MDF (83±1 vs 76±1 Hz; p<0.05), lower log -Fins5 (-12.9±0.3 vs -12.7 ± 0.3 Hz; p<0.05), smaller subjective perception of effort (14.8±0.3 vs 17.0±0.3) and higher subjective perception of recovery (14.2±0.2 vs 12.3±0.3). There was a significant interaction between relative fatigue and the number of sets (F=6.18; p<0.001). Stepwise multiple regressions revealed that subjective perception of recovery best explained the fatigue level generated in the active volunteers [fatigue level= 85.084-5255(SPR)] while for body mass was the best determinant for the inactive group [fatigue level = -21.560 +1.828(BMI)]. Conclusion: Data from the present analysis suggest that physically active individuals show higher torque development and a smaller fatigability index when compared to inactive individuals. Among the fatigue models studied, it is possible that alterations in biochemical components, psychophysiological and EMG are not sensitive to the direct influence of the fatigue dynamics protocol, both in active or inactive individuals.
Revista Brasileira De Medicina Do Esporte, Feb 1, 2019
Introduction: Although sodium bicarbonate (NaHCO3) supplementation has been shown to decrease fat... more Introduction: Although sodium bicarbonate (NaHCO3) supplementation has been shown to decrease fatigue and improve high-intensity exercise performance, the effects on maintenance of isometric contractions are not clear. Objective: To investigate the effect of NaHCO3 on the performance of individuals subjected to a fatigue protocol in an isometric exercise on the isokinetic dynamometer. Methods: Participants were 12 men in a randomized, double-blind, crossover, placebo-controlled trial. Sixteen minutes after the intake of 0.3 g/kg of body mass of NaHCO3 or placebo, the participants performed an isometric fatigue protocol of right knee extension exercises during eight minutes at 70% of maximum voluntary isometric contraction. The fatigue indicator was the time point at which torque was reduced to 50% of the initial value. The length of resistance was assessed by maintaining the task over 50% of the initial torque. Lactate/blood pH concentrations and rate of perceived exertion (RPE) and pain (RPP) indexes were analyzed. The RPE of the session was evaluated 30 minutes after the test. Results: Blood pH was higher in pre-protocol and in the fatigue indicator after NaHCO3 intake, as were the blood lactate concentrations in the fatigue indicator and at the end of the protocol (p<0.001). NaHCO3 supplementation increased the time to fatigue and lessened the rate of decline of isometric peak torque at the end of the protocol (p<0.001). RPE and RPP were smaller at the end of the protocol in the NaHCO3 condition, and the RPE of the session was diminished (p<0.001). Conclusion: NaHCO3 supplementation enhances steady isometric contraction performance and reduces the internal load. Level of Evidence II; Diagnostic studies-Investigation of an examination for diagnosis.
Brazilian Journal of Oral Sciences, Sep 20, 2017
Introduction: Most of the instruments used in Brazil to diagnose Temporomandibular Disorders (TMD... more Introduction: Most of the instruments used in Brazil to diagnose Temporomandibular Disorders (TMD) were developed in another Language. To effectively use instruments that were created in another language, it must be translated into the relevant target language before cross-cultural adaptation. Clinimetric tests should also be performed. Measurement properties consist of quality criteria related to evaluation instruments. These criteria are necessary to determine the quality of the instruments used in Brazil. Objectives: The aim of the present systematic review was to assess the quality of the measurement properties of instruments utilized to diagnose TMD. Methods: Systematic searches were performed of the PUBMED, SCIELO, LILACS and SCIENCE DIRECT databases. Studies addressing questionnaires translated and cross-culturally adapted for use in Brazil were retrieved and the quality of the measurement properties was analyzed using the COSMIN checklist. Results: In the 11 eligible articles, 10 instruments were identified. The studies were evaluated based on their analysis of structural validity, internal consistency, reproducibility (concordance and reliability), responsiveness, ceiling effect and floor effect. None the assessment tools had all its measurement properties tested. Conclusion: The measurement properties of the instruments were not completely tested. Thus, care must be taken when interpreting the scores of these questionnaires.
Journal of Human Sport and Exercise, 2023
The aim of the present study was to determine whether the ingestion of sodium bicarbonate (NaHCO3... more The aim of the present study was to determine whether the ingestion of sodium bicarbonate (NaHCO3) promotes changes in strength, muscle activity, and perceived exertion in trained individuals following high-intensity intermittent exercise. Twelve trained men were enrolled in a randomized, double-blind, crossover study. Each participant underwent two interventions with a 14-day washout period: i) alkalosis (ALK) -administration of gelatinous capsules containing 0.3 g.kg -1 of NaHCO3; ii) placebo (PLA) -administration of capsules containing 0.3 g.kg -1 of calcium carbonate (CaCO3). The outcomes (electromyographic activity of the quadriceps, peak torque, pH, lactate, scales of perceived effort and pain) were collected during a dynamic high-intensity intermittent protocol performed on an isokinetic dynamometer. Repeated-measures ANOVA revealed no differences between conditions for any of the outcomes analysed. Based on the present findings, the ingestion of sodium bicarbonate does not promote changes in muscle activity, strength of the quadriceps, or perceptions of effort and pain in trained individuals during high-intensity intermittent exercise on an isokinetic dynamometer.
Introduction: Fatigue during voluntary muscle contractions is a complex and multifactorial phenom... more Introduction: Fatigue during voluntary muscle contractions is a complex and multifactorial phenomenon associated with central changes and adaptations of the neuromuscular system. Objective: The purpose of this study was to evaluate the fatigue induced by intermittent successive extension of the knee between active and inactive university students. Method: Twenty healthy men (≥18 years), voluntarily participated in this study. To determine the maximum voluntary isometric contraction (MVIC) of the knee extensors muscle group, three sets of isometric contractions of knee extension were performed for five seconds with five minutes of rest between sets. The fatigue protocol consisted of 10 sets of 10 maximal concentric contractions of the extensor on the right knee, performed at 75% of MVIC with an interval of 45”. Results: Significant reductions were observed (p<0.01), both in isometric strength (-34±4%) and the dynamic strength (-40 ± 3%). In addition, the slope of relationship stre...
ERRO RELATIVO MÁXIMO DA ENTROPIA DA AMOSTRA DO SINAL EMG EM FUNÇÃO DE DIFERENTES PARÂMETROS DE ENTRADA m E r
Gait & Posture, Sep 1, 2018
Journal of Physical Therapy Science, 2015
The aim of the present study was to investigate the effects of a single session of transcranial d... more The aim of the present study was to investigate the effects of a single session of transcranial direct current stimulation combined with virtual reality training on the balance of children with cerebral palsy. [Subjetcs and Methods] Children with cerebral palsy between four and 12 years of age were randomly allocated to two groups: an experimental group which performed a single session of mobility training with virtual reality combined with active transcranial direct current stimulation; and a control group which performed a single session of mobility training with virtual reality combined with placebo transcranial direct current stimulation. The children were evaluated before and after the training protocols. Static balance (sway area, displacement, velocity and frequency of oscillations of the center of pressure on the anteroposterior and mediolateral axes) was evaluated using a force plate under four conditions (30-second measurements for each condition): feet on the force plate with the eyes open, and with the eyes closed; feet on a foam mat with the eyes open, and with the eyes closed. [Results] An increase in sway velocity was the only significant difference found. [Conclusion] A single session of anodal transcranial direct current stimulation combined with mobility training elicited to lead to an increase in the body sway velocity of children with cerebral palsy.
The immediate effect of different loads does not alter muscle co-activation of the upper limb in young adults with dyskinetic cerebral palsy
Gait & Posture, Oct 1, 2021
BACKGROUND There is insufficient information on muscle co-activation in the upper limbs to help h... more BACKGROUND There is insufficient information on muscle co-activation in the upper limbs to help healthcare providers develop treatment programs for patients with dyskinetic cerebral palsy (DCP). RESEARCH QUESTION Is the degree of muscle co-activation greater in adults with DCP than in healthy individuals? Does the use of different arm weights modify co-contraction in individuals with PCD? METHODS Fourteen healthy individuals (control group [CG]) and 14 individuals with DCP (dyskinetic group [DG]) participated in the study. The degree of muscle co-activation of the dominant limb during drinking from a mug was compared between the two groups. The task was divided into a going, adjusting, and returning phase. In the DG, an analysis was also performed on using an arm weight during the functional task. The loads corresponded to 10, 20, and 30 % of maximum isometric muscle strength measured in each participant. RESULTS In comparing the two groups, the DG exhibited a greater muscle co-activation in the shoulder and elbow muscles during the going phase, the shoulder, elbow, and wrist during the adjusting phase; and the elbow during the returning phase. The DG also showed a greater mean index of curvature (MIC), time to perform the movement phases, and lesser mean velocity (Vm) to drinking. In analyzing the DG's arm weight, no effect on co-activation, MIC, time to perform the movement phases, and Vm to drinking were found with the loads tested (p > 0.05). CONCLUSION Muscle co-activation is increased in adults with DCP in comparison to healthy individuals. Moreover, arm weight during the functional activity of drinking from a mug did not alter co-activation, although an immediate effect was expected.
Revista Brasileira De Medicina Do Esporte, Feb 1, 2019
Introduction: Although sodium bicarbonate (NaHCO3) supplementation has been shown to decrease fat... more Introduction: Although sodium bicarbonate (NaHCO3) supplementation has been shown to decrease fatigue and improve high-intensity exercise performance, the effects on maintenance of isometric contractions are not clear. Objective: To investigate the effect of NaHCO3 on the performance of individuals subjected to a fatigue protocol in an isometric exercise on the isokinetic dynamometer. Methods: Participants were 12 men in a randomized, double-blind, crossover, placebo-controlled trial. Sixteen minutes after the intake of 0.3 g/kg of body mass of NaHCO3 or placebo, the participants performed an isometric fatigue protocol of right knee extension exercises during eight minutes at 70% of maximum voluntary isometric contraction. The fatigue indicator was the time point at which torque was reduced to 50% of the initial value. The length of resistance was assessed by maintaining the task over 50% of the initial torque. Lactate/blood pH concentrations and rate of perceived exertion (RPE) and pain (RPP) indexes were analyzed. The RPE of the session was evaluated 30 minutes after the test. Results: Blood pH was higher in pre-protocol and in the fatigue indicator after NaHCO3 intake, as were the blood lactate concentrations in the fatigue indicator and at the end of the protocol (p<0.001). NaHCO3 supplementation increased the time to fatigue and lessened the rate of decline of isometric peak torque at the end of the protocol (p<0.001). RPE and RPP were smaller at the end of the protocol in the NaHCO3 condition, and the RPE of the session was diminished (p<0.001). Conclusion: NaHCO3 supplementation enhances steady isometric contraction performance and reduces the internal load. Level of Evidence II; Diagnostic studies-Investigation of an examination for diagnosis.
Revista Brasileira De Medicina Do Esporte, Jul 16, 2018
Introduction: Although sodium bicarbonate (NaHCO3) supplementation has been shown to decrease fat... more Introduction: Although sodium bicarbonate (NaHCO3) supplementation has been shown to decrease fatigue and improve high-intensity exercise performance, the effects on maintenance of isometric contractions are not clear. Objective: To investigate the effect of NaHCO3 on the performance of individuals subjected to a fatigue protocol in an isometric exercise on the isokinetic dynamometer. Methods: Participants were 12 men in a randomized, double-blind, crossover, placebo-controlled trial. Sixteen minutes after the intake of 0.3 g/kg of body mass of NaHCO3 or placebo, the participants performed an isometric fatigue protocol of right knee extension exercises during eight minutes at 70% of maximum voluntary isometric contraction. The fatigue indicator was the time point at which torque was reduced to 50% of the initial value. The length of resistance was assessed by maintaining the task over 50% of the initial torque. Lactate/blood pH concentrations and rate of perceived exertion (RPE) and pain (RPP) indexes were analyzed. The RPE of the session was evaluated 30 minutes after the test. Results: Blood pH was higher in pre-protocol and in the fatigue indicator after NaHCO3 intake, as were the blood lactate concentrations in the fatigue indicator and at the end of the protocol (p<0.001). NaHCO3 supplementation increased the time to fatigue and lessened the rate of decline of isometric peak torque at the end of the protocol (p<0.001). RPE and RPP were smaller at the end of the protocol in the NaHCO3 condition, and the RPE of the session was diminished (p<0.001). Conclusion: NaHCO3 supplementation enhances steady isometric contraction performance and reduces the internal load. Level of Evidence II; Diagnostic studies-Investigation of an examination for diagnosis.
Effect of Transcranial Direct Current Stimulation Combined With Virtual Reality Training on Balance in Children With Cerebral Palsy: A Randomized, Controlled, Double-Blind, Clinical Trial
Journal of Motor Behavior, Sep 20, 2016
ABSTRACT The authors' aim was to investigate the effects of continuous transcranial direct cu... more ABSTRACT The authors' aim was to investigate the effects of continuous transcranial direct current stimulation (tDCS) combined with virtual reality training on static and functional balance in children with cerebral palsy (CP). Twenty children with CP (6 girls and 14 boys; M age = 7 years 6 months ± 2 years) were randomly allocated to two groups. The experimental group received active tDCS and the control group received sham stimulation during the 10 sessions of virtual reality mobility training protocols. The children were evaluated on 3 occasions (preintervention, postintervention, and 1-month follow-up). Static balance was evaluated using a force plate under 4 conditions: feet on force plate with (a) eyes open and (b) with eyes closed, and feet on foam mat with (c) eyes open and (d) with eyes closed. Functional balance was evaluated using the Pediatric Balance Scale and the Timed Up and Go Test. The analyses demonstrated statistically significant postintervention and follow-up effects favoring the experimental group over the control group with regard to the Pediatric Balance Scale, Timed Up and Go Test, and area of oscillation of the center of pressure when standing on the force plate with eyes open. The present findings suggest that tDCS can potentiate the effects of virtual reality training on static and functional balance among children with CP.
Ratio between maximum jaw opening and lateral excursion in Brazilians with and without temporomandibular disorder
ConScientiae Saúde
Introdução: Os movimentos mandibulares (MM) podem oferecer informações importantes sobre a articu... more Introdução: Os movimentos mandibulares (MM) podem oferecer informações importantes sobre a articulação temporomandibular. Objetivo: Avaliar os MM e a relação entre abertura máxima e excursão lateral mandibular em brasileiros com e sem disfunção temporomandibular (DTM). Métodos: Estudo transversal com 801 brasileiros entre cinco e 80 anos. Os indivíduos responderam um questionário de triagem; e os MM foram medidos com paquímetro digital. O teste de Mann-Whitney foi utilizado para comparar diferenças entre sexos e grupos com e sem DTM. O teste de Kruskal-Wallis foi aplicado para determinar diferenças nos MM entre faixas etárias. Resultados: Os MM foram menores nos indivíduos com DTM. A razão entre abertura mandibular e excursão lateral foi de 5,23 em mulheres sem DTM e 5,59 em mulheres com DTM. No homens, a proporção foi de 4,75 e 5,52 em indivíduos sem e com DTM, respectivamente. Conclusão: Os MM são menores em brasileiros com DTM, enquanto que a relação entre abertura mandibular e e...
Multisegmental Kinematic Behavior of Normal and Pronated Feet During the Squat Phase of the Anterior and Lateral Step Down Tests
These data accompanied with the paper "MULTISEGMENTAL KINEMATIC BEHAVIOR OF NORMAL AND PRONA... more These data accompanied with the paper "MULTISEGMENTAL KINEMATIC BEHAVIOR OF NORMAL AND PRONATED FEET DURING THE SQUAT PHASE OF THE ANTERIOR AND LATERAL STEP DOWN TESTS". The aim of the study was to compare the multisegmental kinematic behavior of neutral and pronated feet during the squat phase of the anterior and lateral step down tests. Our hypothesis is that neutral and pronated feet would exhibit different kinematic behaviors during the step down tests based on the analysis of the segments of the tibia, hindfoot and forefoot, as was the case in previous studies that analyzed gait The data were obtained through the kinematic analysis with a three-dimensional system during the execution of two functional tests: Anterior and Lateral Step Down Tests. Using a multisegmental foot model in pronated and neutral foot of health's individuals. The mean for the nine cycles of each variables for the two tasks was calculated and the data were save in excel format. In the data re...
BMC Musculoskeletal Disorders, 2020
Background It is not yet clear which of the various electrophysical modalities used in clinical p... more Background It is not yet clear which of the various electrophysical modalities used in clinical practice is the one that contributes most positively when added to an exercise program in patients with knee osteoarthritis (OA). The aim of the present study was to analyze the clinical effects of the inclusion of interferential current therapy (ICT), shortwave diathermy therapy (SDT) and photobiomodulation (PHOTO) into an exercise program in patients with knee OA. Methods This prospective, five-arm, randomised, placebo-controlled trial was carried out with blinded participants and examiners. We recruited 100 volunteers aged 40 to 80 years with knee OA. Participants were allocated into five groups: exercise, exercise + placebo, exercise + ICT, exercise + SDT, and exercise + PHOTO. The outcome measures included Western Ontario and McMaster Universities (WOMAC), numerical rating pain scale (NRPS), pressure pain threshold (PPT), self-perceived fatigue and sit-to-stand test (STST), which wer...
Gait & Posture, 2018
Background: There is no consensus on kinematics alterations during descending stairs in females w... more Background: There is no consensus on kinematics alterations during descending stairs in females with patellofemoral pain (PFP). In addition, there are no studies that have evaluated the three dimensional kinematics of the trunk, pelvis, hip, knee, and ankle using a multi-segmental model of the foot simultaneously during this task in patients with PFP and evaluated the subphases of stair descent. The objectives of this study were to compare the three dimensional kinematics of the trunk, pelvis, and lower limbs during different subphases of stair descent and identify the discriminatory capacity of the kinematic variables among women with PFP and healthy women. Methods: In this cross-sectional study, thirty-four women with PFP and thirty-four pain free women between 18 and 35 years-old were submitted to three-dimensional kinematic evaluation during stair descent. Results: It was observed that kinematic differences between the groups occurred in the first double support phase of the stair descent, with the variables of internal rotation of the hindfoot in relation to the tibia in the initial contact (2.1°; sensitivity = 68.6%, specificity = 61.8%) and contralateral pelvic drop in load response (1.3°, sensitivity = 65.7%, specificity = 63.7%) presenting the best ability to discriminate women with and without PFP. Conclusion: Our results suggest that kinematic changes during stair descent should be used with caution during the evaluation and decision-making process in women with PFP.
Motriz: Revista de Educação Física, 2019
To determine how EMG, anthropometric, and psychological factors, and physical activity levels aff... more To determine how EMG, anthropometric, and psychological factors, and physical activity levels affect isokinetic peak torque performance (IPT) of multiple set exercise sessions. Methods: 20 participants (27±7 years old), classified as active (A=10) and inactive (I=10), performed 10x10:40secs of maximal unilateral knee flexions and extensions at 120o.s-1. The IPT, EMG, glucose, LDH, and lactate concentrations and perceptions of pain, effort, recovery. Results: Active volunteers showed higher muscularity (52±5 vs 47±4 cm; p<0.05), PTI (262±4 vs 185±4 Nm; p<0.05), relative lower drop in performance (14±2 vs 27±3% ; p<0.05), major MDF (83±1 vs 76±1 Hz; p<0.05), lower log -Fins5 (-12.9±0.3 vs -12.7 ± 0.3 Hz; p<0.05), smaller subjective perception of effort (14.8±0.3 vs 17.0±0.3) and higher subjective perception of recovery (14.2±0.2 vs 12.3±0.3). There was a significant interaction between relative fatigue and the number of sets (F=6.18; p<0.001). Stepwise multiple regressions revealed that subjective perception of recovery best explained the fatigue level generated in the active volunteers [fatigue level= 85.084-5255(SPR)] while for body mass was the best determinant for the inactive group [fatigue level = -21.560 +1.828(BMI)]. Conclusion: Data from the present analysis suggest that physically active individuals show higher torque development and a smaller fatigability index when compared to inactive individuals. Among the fatigue models studied, it is possible that alterations in biochemical components, psychophysiological and EMG are not sensitive to the direct influence of the fatigue dynamics protocol, both in active or inactive individuals.