Julio cerca Serrao

• Principal Investigator at University of São Paulo

Featured Application The proposed moving camera method allows for 2D kinematical swimming analysis with no field of view limitation and with better accuracy and precision than those using a single static camera. Abstract Despite its limitations, 2D kinematical analysis remains a simple and valid alternative for swimming analysis. This analysis is...

Auxiliary devices are used to train gymnastics skills. Based on the principles of training specificity, this study aimed to investigate the effectiveness of a training device for the static cross posture on Men’s Artistic Gymnastics rings through kinematic analysis. Twelve national team gymnasts were divided into two groups, based on their competit...

In the present review, we identify which instruments and parameters are used for sleep quality monitoring in individual sport athletes and which definitions were used for sleep quality parameters in this literature field. Systematic searches for articles reporting the qualitative markers related to sleep in team sport athletes were conducted in Pub...

BACKGROUND: An ankle sprain is a relevant public health issue. Fatigue changes the neuromuscular response in people with chronic ankle instability (CAI). AIM: To evaluate the muscle co-activation on people with chronic ankle instability using cross-correlation analysis. METHOD: Twenty-four healthy women were selected and divided into stability and...

O objetivo dessa revisão sistemática foi verificar os estudos sobre o Fitness Funcional publicados em língua portuguesa para determinar o nível de evidência científica dos mesmos visando oferecer um entendimento para execução da prática baseada em evidência na modalidade. Essa revisão foi executada de acordo com as diretrizes dos Itens Preferidos p...

Postural control relies on three principal sensory systems: vision, vestibular and proprioceptive; that are affected by aging. When performing a cognitive task concomitantly with a motor task, those sensory impairments lead to even greater deleterious effects on balance. We aimed to study the effects of a sensory aid (a light touch) on a dual task...

This review aimed to analyze the findings in the literature related to Mixed Martial Arts (MMA) through an exploratory systematic review and to present the state of the art from a multifactorial perspective. The review was conducted in accordance with the PRISMA statement, with a search performed in the Scopus, PubMed, and Web of Science databases....

Purpose The aim of this study was to systematically review evidence on the prevalence and magnitude of side effects associated with caffeine supplementation in athletes. Methods Systematic searches through the PubMed, VHL, Scopus, and Web of Science databases were conducted according to the PRISMA guidelines. Peer-reviewed articles written in Engl...

A corrida é uma prática largamente utilizada por aqueles que almejam manter ou aprimorar a aptidão física. O treinamento de força tem sido recomendado como forma de aumentar o desempenho e reduzir o risco de lesão em praticantes de corrida, no entanto, a relação entre força muscular e mecânica da corrida ainda necessita de melhor compreensão. O obj...

Este estudo investigou o efeito agudo da corrida descalço sobre parâmetros selecionados das componentes anteroposterior e mediolateral da Força de Reação do Solo (FRS) em corredores habituados ao uso do calçado esportivo. Setenta e um corredores recreacionais, inexperientes em corrida descalço, correram em velocidade auto-selecionada por uma distân...

No melhor de nosso conhecimento, nenhum estudo da literatura comparou a ativação eletromiográfica bilateral dos músculos multífidos e longuíssimo dorsal entre o agachamento e elevação pélvica. O objetivo do presente estudo foi comparar a ativação eletromiográfica por mensuração bilateral dos músculos multífidos e longuíssimo dorsal entre os exercíc...

O objetivo do estudo foi avaliar a contribuição relativa de membros inferiores no nado crawl utilizando o método de perturbação da velocidade (VPM) em atletas de diferentes níveis de habilidade. Participaram do estudo 106 nadadores, os quais foram divididos igualmente em dois grupos de acordo com o nível de habilidade (competitivo e recreativo). Os...

Scientific research on “spiked” landing mechanics in artistic gymnastics presented at the XXVIII International Congress of Biomechanics in Stockholm (ISB 2021).

Scientific research on “spiked” landing mechanics in artistic gymnastics presented at the XXVIII International Congress of Biomechanics in Stockholm (ISB 2021). My thanks to all gymnasts and coaches for their rich contributions to the continued maturation of the results presented in this study.

We performed a systematic review with meta-analysis of randomized controlled trials (RCTs) to assess the effects of strength training (ST) as compared to alternative multimodal or unimodal exercise programs on the number of falls in older adults (≥60 years). Ten databases were con-sulted (CINAHL, Cochrane Library, EBSCO, EMBASE, PEDro, PubMed, Scie...

Big Data has real value when the veracity of the collected data has been previously identified. However, data veracity for load monitoring in professional soccer players has not been analyzed yet. This systematic review aims to evaluate the current evidence from the scientific literature related to data veracity for load monitoring in professional...

Background Given the severe economic and performance implications of hamstring injuries, there are different attempts to identify their risk factors for subsequently developing injury prevention strategies to reduce the risk of these injuries. One of the strategies reported in the scientific literature is the application of interventions with eccen...

Introduction: Human gait is a complex movement dependent on multilevel neural control, which allows a consistent, regular and complex periodic pattern, properties that characterize it as a nonlinear system. Sensory and motor deficits, with diminished proprioceptive responses, may reduce the adaptive capacity of the system, as demonstrated in Parkin...

The study investigated the immediate effect of a moderate interval-running training session on circulating in-flammatory cytokines concentration at real conditions of training. Nine recreational runners (5 women and 4 men; 68,33 ± 10,20 kg; 1,65 ± 0,07 m; 28,67 ± 4,24 years) had blood samples collected from antecubital vein before and immediately a...

The aim of this study was to propose a group of parameters able to quantify not only arm coordination but also inter limb coordination. These include the well know index of coordination with the relative duration of the stroke phases and two new parameters: the Index of synchronization (Ids) between arms and legs actions; and the Index of inter lim...

The effects of ageing on bone can be mitigated with different types of physical training, such as power training. However, stimuli that combine increasing external and internal loads concomitantly may improve bone quality. The goal of this study was to assess the efficacy of a combined power and plyometric training on lumbar spine and distal tibia...

Introduction: The 100-meter dash (100 m) event holds particular appeal. Coaches and researchers seek to understand the determinants of performance in this task. Although information has been produced over the years, it is not fully applied by coaches who generally assess the success of employed training methods through objective field tests, such a...

Background: The application of artificial intelligence (AI) opens an interesting perspective for predicting injury risk and performance in team sports. A better understanding of the techniques of AI employed and of the sports that are using AI is clearly warranted. The purpose of this study is to identify which AI approaches have been applied to i...

Background:The application of artificial intelligence (AI) opens an interesting perspective for predicting injury risk and performance in team sports. A better understanding of the techniques of AI employed and of the sports that are using AI is clearly warranted. The purpose of this study is to identify which AI approaches have been applied to inv...

Soccer cleats with blade-shaped studs promote greater traction on the pitch and can be beneficial for soccer performance. On the other hand, movements with rapid changes of direction, associated with the high traction of soccer cleats, can increase overload and risk of injuries. Given the lack of consensus on the effects of these cleats on mechanic...

Introduction Olympic weightlifting has been adopted as an alternative to plyometric exercise. However, the effects of these exercises in young handball athletes is not known. Objective To compare the effect of Olympic weightlifting training with traditional strength training on jumping, squatting and acceleration performance in young handball athl...

Perception of external loads may be a central topic to understand adjustments to the mechanical demands during movement. Nevertheless, the association between the perceived and the real load received is still controversial. This study aimed to correlate vertical ground reaction force (vGRF) to the perception of impact in different regimens of stimu...

Background Sleep quality is an essential component of athlete’s recovery. However, a better understanding of the parameters to adequately quantify sleep quality in team sport athletes is clearly warranted. Objective To identify which parameters to use for sleep quality monitoring in team sport athletes. Methods Systematic searches for articles re...

It has been postulated that the mechanical and neurophysiological effects induced by stretching decrease maximal muscle strength and power. Additionally, the reduction in neural input and muscle stiffness can affect the joint stabilization process. However, there is no evidence available to support this hypothesis. Thus, the aim of this study is to...

Men’s 110 metres hurdles is one of the oldest disciplines in the Olympic Games and yet scarce anecdotal reports are found to pinpoint technical elements indicators of success. The approach technique to the hurdles has been raised by coaches as a potential element of success however it seems that the approach strategies undertaken to the first hurdl...

Objectives: This study aimed to investigate the effects of creatine (Cr) supplementation on biomechanical parameters related to shock attenuation during a session of high-intensity interval training (HIIT). Methods: A single-blinded, placebo-controlled, crossover design was adopted to test eight male elite soccer players during HIIT sessions und...

We aimed to compare electromyographic activity of the external portion of the pectoralis major, latissimus dorsi and triceps brachii long head in an acute resistance training session between bench press (BP), lat pull down, pullover and triceps lying exercises. Concentric and eccentric phases electromyographic activity were compared. pectoralis maj...

Background: Knee pain during stair managing is a common complaint among individuals with PFP and can negatively affect their activities of daily living. Gait modification programs can be used to decrease patellofemoral pain. Immediate effects of a stair descent distal gait modification session that intended to emphasize forefoot landing during sta...

Introduction: The best strategy for improving knee extensor power, a major functional capacity indicator in older adults, is power training. Nonetheless, the training intensity required to induce optimal gains is yet to be found. Objective: Our purpose was to compare knee extensor peak power responses between low, moderate, and high intensity load...

Introduction: Propulsive force in swimming, represented through impulse, is related to performance. However, since the as different biomechanical parameters contribute to impulse generation, coaches have a difficult task when seeking for performance improvement. Objective: Identify the main components involved in impulse generation in the front cr...

Purpose. Excessive external load is a likely cause of running injuries. Although minimal running has been suggested as a possible approach to reduce impact and injury risk, an abrupt transition from conventional shoes to minimal running is also related to injuries. therefore, the partial minimalist shoe has been suggested as a training strategy for...

Background: CrossFit is recognized as one of the fastest growing high-intensity functional training modes in the world. However, scientific data regarding the practice of CrossFit is sparse. Therefore, the objective of this study is to analyze the findings of scientific literature related to CrossFit via systematic review and meta-analysis. Methods...

Introduction: There is a high incidence of Anterior Cruciate Ligament (ACL) injuries in soccer and 37% of this happens during landing after a jumping event. The measure of valgus knee moment during landing of a Drop Jump (DJ) has been considered a gold standard test to predict the risk of ACL injury in young athletes. Furthermore, researchers have...

Purpose The main objective of this study was to compare frequency parameters produced by six mother wavelets pinpointing the most feasible to investigate electromyographic (EMG) parameters while producing knee extension power in elderly women. The influence of different load conditions in mother wavelet selection and power output were also analyzed...

Conquistar as primeiras posições em competições de futebol é apenas para alguns times. Assim, um melhor entendimento do jogo se torna crucial mediante essa competitividade. O objetivo do presente estudo foi determinar variáveis de scout que melhor descrevem as características técnicas e táticas dos times que participaram de Liga dos Campeões na tem...

Conquistar as primeiras posições em competições de futebol é apenas para alguns times. Assim, ummelhor entendimento do jogo se torna crucial mediante essa competitividade. O objetivo do presenteestudo foi determinar variáveis de scout que melhor descrevem as características técnicas e táticasdos times que participaram de Liga dos Campeões na tempor...

Este artigo objetiva apresentar de forma sumarizada as contribuições das diferentes áreas que compõem a Biodinâmica do Movimento Humano para o desenvolvimento do programa de pós-graduação da Escola de Educação Física e Esporte da USP (PPG-EEFE-USP). Descrever uma trajetória de 40 anos não é tarefa simples, razão pela qual optamos por, partindo de u...

[This corrects the article DOI: 10.1371/journal.pone.0167234.].

Gait analysis may offer information to choose the best exercise-based clinical intervention for the children with clubfoot. However, other motor abilities are not commonly investigated. The aim of this research was to analyze the biomechanics of countermovement vertical jumping in clubfooted children who had undergone surgery. Fourteen children wit...

Individually adjusting the training load of athletes is of undeniable importance, in optimizing adaptation and performance gains, however, this individualized approach has been a challenge for coaches especially in team sports. The countermovement jump (CMJ) height has been one of the most used measurements for monitoring neuromuscular status in hi...

Short-term effects of barefoot and simulated barefoot running have been widely discussed in recent years. Consequences of adopting barefoot running for a long period, including as a training approach, still remain unknown. The present study evaluated the influence of 16 weeks of progressive barefoot running training on impact force and muscle activ...

The aim of this study was to propose a new force parameter, associated with swimmers' technique and performance. Twelve swimmers performed five repetitions of 25 m sprint crawl and a tethered swimming test with maximal effort. The parameters calculated were: the mean swimming velocity for crawl sprint, the mean propulsive force of the tethered swim...

Trend Statement Checklist of this paper. (PDF)

Study protocol submitted and approved by local ethic committee. (PDF)

Summary statistics (mean and standard deviation) of RMS data (% MVIC) during stance phase for shod (SH) and barefoot (BF) running, before (PRE) and after (POST) training (p<0.05). (DOCX)

Data used in the statistical analysis. (XLSX)

Statistical data reports from SigmaStat 3.5. (RTF)

Kinesio taping consists of a technique which uses the application of an elastic adhesive tape. It has become a widely used rehabilitation modality for the prevention and treatment of musculoskeletal disorders. The objective of this study was to verify the effect of the application of Kinesio Taping Denko® in three conditions (facilitation, inhibiti...

Objectives The primary objective of this meta-analysis was to compare countermovement jump (CMJ) performance in studies that reported the highest value as opposed to average value for the purposes of monitoring neuromuscular status (i.e. fatigue and supercompensation). The secondary aim was to determine the sensitivity of the dependent variables....

Methods: It was a randomized, single-blinded and controlled study in which 18 males (28.0 ± 6.7 years old; 85.8 ± 8.2 kg mass; 1.80 ± 0.07 m tall; 0.97 ± 0.04 m lower limb length) performed barbell back squat exercise with different conditions of Kinesio Taping Denko(®) applications: Facilitation, inhibition and placebo. Previous to the mentioned...

Introdução: Kinesio Taping é uma técnica realizada com aplicação de fitas elásticas sobre a pele, que se propõe a produzir determinados efeitos com fins de prevenção e tratamento das lesões musculoesqueléticas. No entanto, os meios pelos quais tais efeitos ocorrem continuam sendo investigados e discutidos, principalmente no que diz respeito à utili...

Introduction: The interest in minimalist and barefoot running is growing continuously. However, there is no data on how many runners drop out during this process. Objective: To describe the adhesion and dropout rates of a six-month instructed training program based on barefoot and minimalist footwear running. Methods: Thirty-four recreational run...

A variety of congenital pediatric disorders have demonstrated that foot deformities interfere in locomotion ability. However, there are uncertainties about the mechanical effects of this deformity. Quantitative gait analysis allows the measurement and assessment of walking biomechanics, which facilitates the recommendation of treatment alternatives...

The cross is a key skill in Male Artistic Gymnastics rings routines. However, few researches were found about this skill. There is knowledge about the forces needed to perform the cross, or about muscles activation, separately. The aim of this paper was to accomplish a comprehensive research about the biomechanics of cross on rings, in order to obt...

Abstract The table vault is an event of male and female Artistics Gymnastics. Although it can be performed in a variety of rotations and body positions in different phases, it can be separated in three groups: handspring, Yurchenko and Tsukahara. It is believed that kinematic variables of vault may vary according to group of vault or gymnast body p...

The aim of this study was to determine the effect of the time between measures on ground reaction force running variability; 15 healthy men (age = 23.8 ± 3.7 years; weight = 72.8 ± 7.7 kg; height 174.3 ± 8.4 cm) performed two trials of running 45 minutes at 9 km/hr at intervals of seven days. The ground reaction forces were recorded every 5 minutes...

The purpose of this study was to determine whether auto-regulating jump performance using the minimal individual difference (MID) associated with countermovement jump (CMJ) height, could be used to regulate and monitor a training phase, that elicited functional overreaching and tapering in team sport athletes. The participants were familiarized wit...

Kinesio taping consists of a technique which uses the application of an elastic adhesive tape. It has become a widely used rehabilitation modality for the prevention and treatment of mus-culoskeletal disorders. The objective of this study was to verify the effect of the application of Kinesio Taping Denko ® in three conditions (facilitation, inhibi...

Introduction: Measuring knee extensors' power in elderly population is crucial but not accessible to everyone. Objective: To provide a method to calculate knee extensors' power in a conventional knee extension machine. Method: Thirteen sedentary elderly women (69.3±4.1 years) performed six knee extensions as fast as possible. Kinematic data, an a...

The purpose of this study was to investigate the effects of running drills during an interval training program on biomechanical parameters of running. Thirty recreational runners, divided into two groups (control [CG] and experimental [EG]) were submitted to a 15-week interval training, but only EG performed running drills in the training. The test...

The purpose of this study was to verify whether the use of a training device is a specific drill to the static cross posture on rings. Six elite Brazilian gymnasts performed the cross on competition and training rings. Variables analysed from digitised video data were right and left shoulder angles in the frontal plane. Larger angles were found whe...

INTRODUÇÃO: a entorse em inversão do tornozelo, uma das lesões mais comuns do esporte, muitas vezes ocorre na fase final de um treino ou competição. Mesmo sabendo que a entorse é multifatorial, tal característica gera a hipótese que a fadiga muscular possa ser um fator predisponente para o desenvolvimento da lesão. OBJETIVO: a presente investigaçã...

Running economy (RE) is defined as the energy cost to maintain a sub-maximal running velocity and seems to be affected by individual's neuromuscular characteristics, such as stiffness level. Both resistance training (RT) and whole body vibration training added to RT (WBV + RT) have been shown to influence those characteristics. Thus, it is conceiva...

The purpose of this study was to investigate the effects of exercise order on electromyographic activity in different muscle groups among youth men with experience in strength training. Three sets of 8 RM were performed of each exercise in two sequences order: (a) sequence A: bench press, chest fly, shoulder press, shoulder abduction, close grip be...

Introduction: It is necessary to monitor and regulate training load to ensure that planned performance gains are actualised and the likelihood of non-functional overreaching mitigated. In this study the countermovement jump (CMJ) was used as a tool for monitoring and regulating training load, with the determination of each individual´s typical erro...

Running has been a very important expression of movement. The expansion of your practice has been followed by a seeking for new strategies to improve mechanical load control and performance. Thus, the belief that barefoot running could be an effective strategy to attend these objectives has been reinforcing (Divert et al., 2005, Lieberman et al. 20...

Background Studies involving chronic creatine supplementation in elite soccer players are scarce. Therefore, the aim of this study was to examine the effects of creatine monohydrate supplementation on lower-limb muscle power in Brazilian elite soccer players (n = 14 males) during pre-season training. Findings This was a randomized, double-blind, p...

Golden Retriever Muscular Dystrophy (GRMD) is a dystrophin-deficient canine model genetically homologous to Duchenne Muscular Dystrophy (DMD) in humans. Muscular fibrosis secondary to cycles of degeneration/regeneration of dystrophic muscle tissue and muscular weakness leads to biomechanical adaptation that impairs the quality of gait. Physical the...

Aim. The objective of this study was to compare electromyographic signal (EMG), stride length (SL) and stride frequency (SF) in three different speeds during an incremental running protocol on a treadmill. Methods. Eleven male recreational runners performed an incremental running protocols on treadmill with an initial speed of 10 km/h and increment...

O objetivo do presente estudo foi analisar a validade dos parâmetros de potência absolutos e relativos do Running-based Anaerobic Sprint Test (RAST) com base no teste de Wingate (WAnT). Doze voluntários do sexo masculino com idade de 25,50 anos (± 2,32) realizaram os testes RAST e WAnT. Foram observados valores significativos (p < 0,01) de correlaç...

INTRODUÇÃO: Testes incrementais de corrida permitem a determinação de limiares metabólicos e neuromusculares. O objetivo do presente estudo foi comparar índices eletromiográficos e metabólicos entre dois protocolos incrementais de corrida com diferentes intervalos entre cada estágio de velocidade. MÉTODOS: Participaram do estudo 14 voluntários do...

This study tested the hypothesis that Patellofemoral Pain (PFP) individuals exhibit less variability in leg-rearfoot frontal plane coupling during stair descent than healthy controls. During kinematic analysis , it was discovered that two groups of PFP individuals acted differently. While some participants exhibited a peak knee flexion in early sta...

The purpose of this study was to analyze the kinetic responses of running shoes submitted to prolonged use. Four shoes (R1, R2, T1 and T2) were used for 500 km except for T1 which was used for 1000 km. At every 100 km, Ground Reaction Force (GRF) and plantar pressure measurements were collected. In T2, there was a slight trend of increase in Loadin...

OBJECTIVE: The aim of the present study was to propose an individualized familiarization method for vertical jumps and to verify its effect on intra-subject variability. METHODS: Fifty three men (mean ± S.D.; age 23.5 ± 3.3; height 1.76 ± 0.08 m; mass 72.8 ± 8.6 Kg; body fat 12.9 ± 5.2%) performed successive jumps to reach the proposed stability le...

INTRODUCTION The vertical ground reaction force (VGRF) applied to the human body during landing is determinant to the occurrence of injuries, when the jumps are frequently performed and the VGRF is high [4]. Nonetheless, many sports require landings constantly, as jumps at games and training situations. Moreover, there is a positive relation betwee...

INTRODUCTION The vertical ground reaction force (VGRF) applied to the human body during landing is determinant to the occurrence of injuries, when the jumps are frequently performed and the VGRF is high [4]. Nonetheless, many sports require landings constantly, as jumps at games and training situations. Moreover, there is a positive relation betwee...

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