Bruno Mezêncio

University of São Paulo | USP · Departamento de Biodinâmica do Movimento do Corpo Humano (EEFESP)

Intracycle velocity variation is a swimming relevant research topic, focusing on understanding the interaction between hydrodynamic propulsive and drag forces. We have performed a systematic scoping review to map the main concepts, sources and types of evidence accomplished. Searches were conducted in the PubMed, Scopus and Web of Science databases...

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...

Intra- and inter-cycle velocity variations are of utmost importance for achieving enhanced swimming performances. However, intra-cycle events can impact and interfere with the subsequent cycles, making relevant to study several consecutive cycles allowing a better understanding of this possibility. We have assessed front crawl intra- and inter-cycl...

Backstroke swimming, a cyclic and continuous movement, displays a repeating structure due to the repeated action of the limb, presenting similar (but not identical) cycles. Some variability is generated by instabilities, but this may play a functional role in the human performance, allowing individual adaptations to constraints. The current study e...

We examined whether endurance performance and neuromuscular fatigue would be affected by caffeine ingestion during closed- and open-loop exercises. Nine cyclists performed a closed-loop (4,000-m cycling time trial) and an open-loop exercise (work rate fixed at mean power of the closed-loop trial) 60 min after ingesting caffeine (CAF, 5 mg/kg) or pl...

Aim: We investigated how Arena Powerskin R-EVO Closed Back (swimsuit) and Arena Carbon Triwetsuit (full-sleeve, wetsuit), both approved by the Fédération Internationale de Natation (FINA) regulations, affect biomechanics and energetics of 3 Elite female open water (OW) swimmers at maximal and 4 submaximal swimming intensities. Methods: Three Elite...

A Biomecânica é uma ciência do grupo das ciências biológicas que trata de análises físico-matemáticas de sistemas biológicos e, como consequência, de movimentos humanos. Estes movimentos são analisados através de leis e normas mecânicas com relação a parâmetros específicos do sistema biológico. Atualmente a Biomecânica constitui-se numa disciplina...

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...

O objetivo deste estudo de caso foi relatar os resultados de desempenho comparativo em termos de cinemática, economia, eficiência geral e coordenação em diferentes intensidades de nado com recurso a dois tipos de fatos de competição (fato de banho, SWIMSUIT; e fato isotérmico, WETSUIT) entre a melhor nadadora de águas abertas da Federação Portugues...

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...

Background: Different types of sound cues have been used to adapt the human gait rhythm. We investigated whether young healthy volunteers followed subliminal metronome rhythm changes during gait. Methods: Twenty-two healthy adults walked at constant speed on a treadmill following a metronome sound cue (period 566 msec). The metronome rhythm was...

França CBS, Peres JS, Rodrigues SA, Mezêncio B, Ferreira JC. Effect of Different Mechanical Vibration Frequencies on the Performance of Countermovement Jump. JEPonline 2019;22(5):38-46. The purpose of this study was to verify the acute effect of different vibration frequencies on countermovement jump (CMJ) performance after Whole Body Vibration (WB...

Costa V, Da Silva FF, De Lima RM, Mezêncio B, Ferreira JC. Mechanical Vibration Increases EMG Activity But Does Not Affect Strength Resistance Performance. JEPonline 2019;22(4):120-129. The aim of this study was to verify if the mechanical vibration in the exercise of isometric push-up affects the electrical activity of muscles of the upper limbs a...

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...

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...

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...

The aims of this study were 1) to characterize the intensity of the vibration stimulation in women diagnosed with fibromyalgia (FM) compared to a control group of healthy women (HW) matched by age and anthropometric parameters, and 2) to investigate the effect of a single session of whole body vibration (WBV) on inflammatory responses. Levels of ad...

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...

In high level championships small details are able to define the swimming medalists. Overall 0.01 s represents just a short piece of swimming final time, but between elite swimmers just 1.12% of the final time performance in 50 meters freestyle are improved annually. In this perspective greater block time differences over swimming final time differ...

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...

O objetivo do estudo foi identificar os modelos que melhor explicam as relações entre as variáveis do scout dos jogos da Copa do Mundo de futebol de 2014. Foram analisados os 32 jogos da competição. Os dados foram retirados do site oficial da Federação Internacional de Futebol (FIFA). Os resultados indicaram que os modelos para as variáveis passes...

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...

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

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...

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...

O objetivo do estudo foi identificar os modelos que melhor explicam as relações entre as variáveis do scout dos jogos da Copa do Mundo de futebol de 2014. Foram analisados os 32 jogos da competição. Os dados foram retirados do site oficial da Federação Internacional de Futebol (FIFA). Os resultados indicaram que os modelos para as variáveis passes...

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...

Objetivos: O objetivo do estudo foi analisar a relação entre a carga interna e a magnitude do impacto através do NBL com os descritores de carga externa por meio da acelerometria. Amostra: Participaram deste estudo atletas de futebol profissional de um time da Série A do Campeonato Brasileiro (n = 9; idade 25,1±4,6 anos; estatura 176,6±7,9 cm; mass...

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...

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...

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...

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...

Objetivo: Identificar os modelos que melhor explicam as relações entre as diferentes variáveis do scout dos jogos da Copa das Confederações realizada em 2013. Métodos: Foi considerado para análise o scout, composto por 12 variáveis, dos 16 jogos da competição. Para verificar a existência de relação entre todas as variáveis, foi realizada uma anális...

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...

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...

INTRODUCTION The swimming speed is the result of the interaction between the propulsive forces generated by the swimmer and the drag force. In swimming the active drag force is the resistance encounter by the swimmer when he moving through the water. It's assumed that the drag force is related to the square of the swimming speed, thus the active dr...

Twelve participants ran (9 km · h(-1)) to test two types of running shoes: replica and original shoes. Ground reaction force, plantar pressure and electromyographic activity were recorded. The shoes were tested randomly and on different days. Comparisons between the two experimental conditions were made by analysis of variance (ANOVA) test (P ≤ 0.0...

The purpose of this study was to assess the effect of training load regulation, using the CMJ at the beginning of the session, on the total plyometric training load and the vertical jump performance. 44 males were divided into 4 groups: No Regulation Group (nRG), Regulation Group (RG), Yoked Group (YG) and Control Group (CG). The nRG received 6 wee...

Avelar, NCP, Simão, AP, Tossige-Gomes, R, Neves, CDC, Mezencio, B, Szmuchrowski, L, Coimbra, CC, and Lacerda, ACR. Oxygen consumption and heart rate during repeated squatting exercises with or without whole-body vibration in the elderly. J Strength Cond Res 25(12): 3495-3500, 2011-The aim of this study was to investigate whether vibration plus squa...

Electromyographic activity during maximal isometric contraction combined with local sinusoidal vibration Study aim : To compare the electromyographic activity during maximal isometric contraction alone or combined with local sinusoidal vibration. Material and methods: A group of 6 men aged 23 - 29 years performed 3 maximal voluntary contractions of...