Raphael Luiz Sakugawa

Raphael Luiz Sakugawa
Universidade Federal de Mato Grosso (UFMT) | UFMT · Faculdade de Educação Física (FEF)

Professor

About

82
Publications
16,706
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
275
Citations

Publications

Publications (82)
Chapter
Full-text available
Dez anos se passaram desde daquele 5 de novembro de 2009 - o sonho de criar um laboratório que pudesse estudar afundo as interações do exercício em contexto de aumento de rendimento humano e recuperação deste pudesse proporcionar aos estudantes de graduação em educação física e fisioterapia - não só da Universidade Federal do Amazonas - mas de toda...
Article
Purpose The objective of this study was to evaluate a plyometric conditioning activity (3 sets of 5 countermovement jumps, [CA]) for twitch properties and voluntary knee extension. Methods After a familiarization session, fourteen highly-trained sprint athletes, 12 men (23.25 ± 7.17 years) and 2 women (23.0 ± 2.8 years) performed 2 experiments, ea...
Article
Full-text available
Purpose The generalized joint hypermobility (GJH) syndrome is a condition characterized by a connective tissue disorder that may negatively affect the muscle function and muscle balance in the lower limbs. The aim of study was to compare isometric and dynamic maximal strength, total work, active optimum angle, electromyographic activity strategy, a...
Preprint
Full-text available
Objectives Deficits in muscle performance could be a consequence of a reduced ability of a motor neuron to increase the rate in which it discharges. This study aimed to investigate motor unit (MU) discharge properties of each Triceps surae muscle (TS), and TS torque steadiness during submaximal intensities in runners with Achilles tendinopathy (AT)...
Chapter
Full-text available
A obra intitulada “Avanços dos estudos científicos na área das ciências exatas vol.01”, publicada pela Brazilian Journals, apresenta um conjunto de vinte e um capítulos que visam abordar assuntos relacionados com a área das ciências exatas. A seguir são apresentados os trabalhos que compõem o livro. Logo, os artigos apresentados neste volume aborda...
Article
Full-text available
The addition of manual pressure on the electrode during neuromuscular electrical stimulation (NMES) has been used to reduce current intensity and perceived discomfort. In this study we aimed to test i) whether this approach affect the reliability of commonly made torque output measurements and ii) whether subcutaneous-fat thickness influence the ef...
Article
Age-related deterioration within both motoneuron and monoaminergic systems should theoretically reduce neuromodulation by weakening motoneuronal persistent inward current (PIC) amplitude. However, this assumption remains untested. Surface electromyographic signals were collected using two 32-channel electrode matrices placed on soleus and tibialis...
Article
Introduction The present study aimed to analyze the acute effects of a myofascial release session (MFR) with a portable electric massager (PEM) at different frequencies (25 Hz and 52 Hz) on the superficial and deep fascial motion. Methods The limbs of fourteen participants (12 men and 2 women, age = 34 ± 10 years; height = 1.74 ± 0.09 m; weight =...
Article
The aim of the present study was to compare shoulder internal rotator and external rotator isokinetic parameters in concentric and eccentric contractions between volleyball players with and without a history of shoulder injury. Thirty male volleyball players participated of this study, divided into two groups: with a history of injury (WHI) in the...
Article
Full-text available
The purpose of the present study was to investigate effects of type of exercise on the muscle strength and functional performance gains for lower-body in older adults after heavy resistance training. Twenty untrained older adults volunteers (8 men and 12 women) were randomized and placed into two groups: multi-joint exercise—MJ (65 ± 6 years) and s...
Article
Full-text available
This study aimed to verify the effect of a pace training session at an intensity corresponding to the kick frequency at the anaerobic threshold (KFAT) on the internal load response and motor response performance of the roundhouse kick. Twelve black belt Taekwondo athletes underwent two evaluation sessions: (1) performed the Progressive Specific Tes...
Preprint
Full-text available
Age-related deterioration within both motor neurones and monoaminergic systems should theoretically reduce neuromodulation by weakening motor neuronal persistent inward current (PIC) amplitude. However, this assumption remains untested. Surface electromyographic signals were collected using two 32-channel electrode matrices placed on soleus and tib...
Article
Full-text available
The aim of the present study was to investigate the influence of intensity of load and cuff pressure on training volume and myoelectric activation during the knee extension exercise executed with and without blood flow restriction (BFR) to failure. Ten young men (22 ± 2 y), with at least six months of training experience, visited the laboratory on...
Article
Full-text available
Cessation of resistance training could result in loss of the gains acquired. Therefore, the aim of the current study was to verify the effect of 1-year of detraining following resistance training on body composition, functional capacity, handgrip strength, localized muscular endurance, and countermovement jump performance (CMJ) in older adults. Fif...
Article
Full-text available
New devices with clinical applicability are needed to provide fast and precise diagnostics. In this way, the aim of this study was to verify the reliability of the portable electrical impedance myograph (PEIM) Skulpt® for morphological measures of the vastus lateralis (VL). MATERIALS AND METHODS: A cross-sectional evaluation was designed on an inde...
Article
This study tested if estimates of persistent inward currents (PICs) in the plantar flexors would increase with the level of voluntary drive. High-density surface electromyograms were collected from soleus and gastrocnemius medialis of 21 participants during ramp-shaped isometric contractions to 10%, 20%, and 30% (torque rise and decline of 2%/s and...
Preprint
Full-text available
Aim: To test the hypothesis that estimates of persistent inward currents in the human plantar flexors would increase with the level of voluntary drive. Methods: Twenty-one participants volunteered for this study (29.2±2.6 years). High-density surface electromyograms were collected from soleus and gastrocnemius medialis during ramp-shaped isometric...
Article
Full-text available
The present study aimed to compare the activation of the lower lumbar erector spinae, gluteus maximus, biceps femoris, and rectus femoris in two trunk positioning (straight, and inclined) during three lunge exercises (static, step-forwarding, and walking) in trained young women. Twelve women (24 ± 3 years) were selected and then performed, in a ran...
Article
Full-text available
Background and purpose Unusual eccentric exercise (EE) may affect muscle ability to produce rapid force. Previous study suggested that short-term mate tea (MT) consumption may enhance muscle strength recovery from EE, but MT benefits on the rate of torque development (RTD) are unknown. This study investigated the effect of MT on RTD and muscle dama...
Article
This study aimed to analyse unilateral countermovement jumps (CMJ) performance and muscle soreness in lower limbs, as well as to compare lower limb asymmetry over 48 h after a stretch-shortening cycle (SSC) fatigue protocol. Fourteen judo athletes performed unilateral CMJ on each leg before, and after the 5th and 10th sets over 24 h and 48 h of an...
Article
Full-text available
Purpose This study aimed to verify the relationship between bilateral lower limb asymmetry and performance in the Special Judo Fitness Test (SJFT). Methods Twelve male judo athletes (23.0 ± 3.9 years) participated in this study. Athletes irst performed ultrasonography assessments and unilateral countermovement jumps (CMJ), and 48 h after they perfo...
Article
Objective: The aim of this study was identifying the best energy dose of photobiomodulation therapy (PBMT) able to improve muscle performance and reduce fatigue during a multiple-set knee extension exercise. Methods: Eighteen physically active men participate in this study. Each participant performed an isokinetic exercise protocol (5 sets of 10 kn...
Article
Objective: The aims of the present study were to verify the effects of photobiomodulation therapy (PBMT) on time trial run performance over 1,500-m, as well as on individual responsiveness of recreative runners. Methods: Nineteen recreationally-trained runners participated in a randomized, crossover, double-blind, placebo-controlled trial. The stud...
Conference Paper
Full-text available
Introdução: O chute semicircular é muito usado nas diferentes modalidades de esportes de combate. A performance é associada a parâmetros temporais como tempo de resposta (TRESP), definido como o tempo entre a apresentação do estímulo até o momento que o golpe atinge o alvo. Objetivo: Verificar quais parâmetros determinam o desempenho da resposta mo...
Article
Purpose To compare the use of three variations of push-ups (traditional - stable surface, performed with hands on the Swiss ball – Swiss ball-hands, and performed with feet on the Swiss ball – Swiss ball-feet) on surface electromyography activity (sEMG) in the agonist and stabilizer muscles. Methods Ten trained men (26±5 years, 76.8±8.7 kg, 1.70±0....
Article
The purpose of the present study was to investigate the volume-dependence of upper-body strength performance improvement; and the retention effects after detraining in aging adults. Eighteen healthy untrained middle-aged volunteers were randomized into two groups: low volume (LV), mean=494 kg, and high volume (HV), mean=686 kg, load. Participants w...
Article
Full-text available
Fatigue and muscle damage negatively affect performance in lower limb exercises involving the stretch-shortening cycle in judo athletes during competition and training sessions. Photobiomodulation therapy has emerged as an effective non-invasive strategy to attenuate fatigue and muscle damage when applied before different types of exercises. Our ob...
Article
Full-text available
PURPOSE: Photobiomodulation therapy (PBMT) has emerged as an effective non-invasive strategy to attenuate fatigue and muscle damage when applied before different types of exercises; however, there is no evidence regarding PBMT effects on fatigue and muscle damage in judo athletes. Thus, the aim of our study was to investigate the PBMT effect on fat...
Conference Paper
Full-text available
Introdução: A locomoção em escadas está entre as mais desafiadoras e perigosas tarefas funcionais na vida diária de idosos e constitui aproximadamente 10% dos acidentes fatais nesta população. Objetivo: Correlacionar indicadores de quedas com a distância em que o pé passa do degrau durante a locomoção em escadas em idosos saudáveis. Materiais e mét...
Conference Paper
Full-text available
A estimulação elétrica neuromuscular (NMES) é uma técnica utilizada para avaliação do sistema nervoso e musculotendíneo por meio de pulsos simples, doublets ou trens de estimulação (i.e., octeto – 8 pulsos a 300 Hz). Embora o octeto seja capaz de evocar maior força explosiva, essa técnica frequentemente gera elevados níveis de desconforto. Recentem...
Article
Full-text available
This study aimed to analyze neuromuscular and postural control in visually and nonvisually impaired judo athletes. Two judo athletes, one visually impaired and the other nonvisually impaired, participated in the study. The athletes presented similar demographic, anthropometric, and judo-technical characteristics. They performed maximal isometric ha...
Article
Full-text available
Background The interruption of training (detraining) results in loss of the gains acquired. Partial retention could occur after detraining, and variation in training stimuli may optimize retraining adaptations. Aims To evaluate the effect of a resistance retraining program on strength and functional capacity performance after a detraining period. M...
Article
Full-text available
IntroductionPhotobiomodulation therapy (PBMT) applied prior to exercise may provide ergogenic effects by delaying the onset of fatigue. The Brazilian jiu-jitsu (BJJ) is a domain combat sport in which elbow flexors’ isometric contraction is commonly performed. PurposeThis study was aimed at investigating the effects of PBMT on torque parameters in g...
Article
Full-text available
Background Progressive specific taekwondo test (PSTT) was designed to evaluate aerobic indicators and maximum frequency kick (FKMAX) in taekwondo athletes. Both can be used as specific aerobic power variables to estimate maximum oxygen uptake (VO2MAX). Aim To determine a linear regression equation to estimate the VO2MAX during PSTT in taekwondo at...
Article
Full-text available
We investigated the effect of postmatch cold-water immersion (CWI) on markers of muscle damage, neuromuscular fatigue, and perceptual responses within 72 h after a rugby match. Twenty-two professional male rugby players were randomized into CWI (10 °C/10 min; n = 11) or control (CON: 30 min seated; n = 11) groups. Activity profile from Global Posit...
Article
Full-text available
The purpose of this study was to investigate the influence of exercise order on volume load (VL) and myoelectric activation (EMG) during the bench press (BP), military press (MP) and close-grip bench press (CGBP) exercises executed with a barbell and Smith machine. Twelve men experienced in resistance training performed four different exercise sess...
Poster
Full-text available
Introdução: Para promover as adaptações orgânicas desejadas é fundamental identificar variáveis que possam auxiliar no controle das cargas interna e externa e na prescrição e planejamento do treinamento. Em esportes de combate a carga interna (e.g., frequência cardíaca - FC) tem sido estimada a partir de parâmetros de carga externa obtidos durante...
Article
Full-text available
Muscle damage markers after endurance cycling with multiple sprints Objective: The aim of this study was to analyze the acute effect of a 2-hours cycling exercise involving repeated sprints in strength loss and serum concentrations of creatine kinase (CK) and lactate dehydrogenase (LDH). The sample consisted on nine competitive male cyclists (age:...
Article
Full-text available
Background: While it is accepted that resistance training can improve functional capacity in older individuals, the neuromuscular source of this improvement has yet to be identifed. Aim: This study investigated the link between improved neuromuscular performance and functional capacity after a 12-week resistance training period in untrained healthy...
Poster
Full-text available
PHYSICAL PERFORMANCE IS INFLUENCED BY MATCH POSITION ON RUGBY UNION
Article
The aim of this study was to investigate whether 12 weeks of leg press strength training exercise could affect the conventional and functional hamstring/quadriceps ratios in elderly. Twelve elderly participants were submitted to a 12 week progressive training protocol (two sessions/week) using a 45º leg press exercise. A significant increase in the...
Article
Full-text available
Background: The steady-state increase in muscle force generating potential following a lengthening contraction is called residual force enhancement (RFE). In this study, we aimed to test for differences in torque, electromyographic activity (EMG), and the associated neuromuscular efficiency (NME) between isometric voluntary contractions of elbow f...
Article
Full-text available
Rodrigues B, Maior AS, Sakugawa R, Bezerra E. Acute Effects of Fixed Rest Time during Multiple Sets on Upper Limbs Performance. JEPonline 2018;21(3):86-93. This study analyzed the acute effects of a 2-min rest interval on range of motion (ROM), blood lactate, and myoelectric activation (sEMG). Ten healthy resistance-trained men participated in the...
Conference Paper
Full-text available
A interrupção do treinamento (destreinamento) resulta em perda de ganhos adquiridos com o treinamento. Embora possa ocorrer uma retenção parcial dos ganhos após o destreinamento, facilitando o processo de retreinamento, é muito comum ocorrer tais reduções em indivíduos idosos. Além disso, outro fator que poderia acelerar a adaptação no retreinament...
Conference Paper
Full-text available
The photobiomodulation therapy (PBMT) applied prior to exercise may provide ergogenic effects by delaying the onset of fatigue. Athletes of sports involving dynamic and isometric strengths as essential components to success (e.g., combat sports) may be benefited with preconditioning PBMT effect. The Brazilian JiuJitsu (BJJ) is a domain combat sport...
Article
Full-text available
The purpose of this study was to verify the photobiomodulation therapy (PBMT) effects with different doses on neuromuscular economy during submaximal running tests. Eighteen male recreational runners participate in a randomized, double-blind, placebo-controlled trial, which each participant was submitted to the same testing protocol in five conditi...
Article
Full-text available
This study was aimed at verifying effects of photobiomodulation therapy (PBMT) with different energy doses (15, 30, and 60 J per site) on physiological and performance parameters during running tests. Fifteen male recreational runners participated in a crossover, randomised, double-blind, and placebo-controlled trial. They performed testing protoco...
Article
The aim of this study was to investigate the effect of cadence on volume load (VLoad) and muscle activity during agonist–antagonist paired sets (APS) in the lower body. Twelve trained men (24.0 ± 3.3 years; 78.3 ± 9.7 kg; 1.77 ± 0.58 m) volunteered to participate in this study. After the 10 maximum repetition test for leg extension and seated leg c...
Article
Full-text available
Despite the evolution of runner performance in athletes with cerebral palsy (CP), little is known about neuromuscular parameters of sprinters from different classes, especially related to power output, muscular imbalances and asymmetry indexes in lower limbs. The aim of this study was to assess muscle power, muscular imbalance and asymmetry in spri...
Article
The aim of this study was to identify the effects of two different time responses on fatigue of knee extensor. Sixteen male volunteers (26±6.0 years 81±12 kg, and 181±7.4 cm) participated of study. Participants performed the same protocol in five sessions, [control, placebo (placebo applied both 6 hours before and immediately before the test), 6h b...
Conference Paper
INTRODUÇÃO: Com o envelhecimento os processos de perda da capacidade de produção de força muscular (i.e., máxima e explosiva) causam redução da independência do idoso em desempenhar suas tarefas funcionais. OBJETIVO: Comparar e correlacionar a capacidade de produção de torque muscular e a taxa de desenvolvimento de força (TDF) com a capacidade func...
Conference Paper
Full-text available
Introdução: A identificação de variáveis que possam auxiliar na prescrição do treinamento e que permitam um maior controle das cargas interna e externa é fundamental para promover as adaptações orgânicas desejadas e obter melhores resultados com a intervenção do programa de treino. Objetivo: O objetivo do presente estudo foi verificar o efeito de 8...
Conference Paper
Full-text available
RESUMO Introdução: o Teste Específico para Taekwondo (TET) é um teste incremental com aumento da intensidade do trabalho por meio de sinal sonoro e incremento de mais quatro chutes (Bandal Tchagui) a cada estágio. O TET permite avaliar os indicadores de capacidade e potência aeróbia em atletas de Taekwondo (i.e., consumo máximo de oxigênio-VO2MAX)....
Article
Full-text available
DOI: http://dx.doi.org/10.5007/1980-0037.2017v19n1p108 Several studies showed that respiratory exchange ratio (RER) have been used as an alternative to evaluate the aerobic capacity in a single incremental test. However, few studies have investigated trained runners. The aim of this study was to verify if the respiratory exchange ratio (RER) could...
Conference Paper
Lunge exercise is often utilized as a rehabilitation exercise (1), it is very versatile, because it can be performed both with barbell and dumbbells. Farrokhi et al.,(2) demonstrated that, the execution of lunge exercise with the trunk in the forward position elicits a slightly increase of gluteus maximus EMG activity. However, this variation shift...
Conference Paper
Introdução: Embora existam diversos modelos musculares complexos (1), do ponto de vista prático, grande parte das avaliações físicas é baseada em modelos simplificados, muitas vezes levando em consideração parâmetros unidimensionais como, por exemplo, pico de torque (2). Previamente foi proposto em um estudo de caso um modelo simplificado que leva...
Conference Paper
Full-text available
O objetivo deste estudo foi avaliar parâmetros neuromusculares (salto vertical e força de preensão manual) e de equilíbrio em judocas com deficiência visual. Foram avaliados dois judocas (um do sexo masculino e um do feminino). As seguintes avaliações foram realizadas: equilíbrio bipodal, sendo analisado o centro de pressão (COP), saltos verticais...
Poster
Full-text available
Introdução e Objetivo Introdução: A fototerapia, quando aplicada previamente a exercıć ios fı́sicos, tem se mostrado capaz de postergar a fadiga muscular aumentando assim o desempenho. A maioria do estudos que demonstram efeitos ergogênicos da fototerapia realizam a aplicação imediatamente antes da tarefa motora. Recentemente, estudos envolvendo mo...
Article
Full-text available
Phototherapy has been used for reducing muscle fatigue. In view of the various types of phototherapy cluster probes available in the market, the purpose of this study was to compare the effects of a similar phototherapy dosage with two different cluster probes on elbow flexor muscle fatigue: small cluster probe (SC= 9 diodes; 7.5 cm2) vs. large clu...
Conference Paper
Full-text available
Principais contribuições deste trabalho-O paratleta (Classe F42) deve permanecer o maior tempo possível com as muletas antes de saltar;-Trabalhos de fortalecimento dos flexores do joelho são necessários para o equilíbrio muscular.-Avaliações biomecânicas trazem informações importantes para a melhora no desempenho técnico e físico no paradesporto. I...
Article
Full-text available
Moura BM, Bezerrra E, Orssatto LBR, Sakugawa RL, Diefenthaeler F. Prediction of One Repetition Maximum for 45º Leg Press in Untrained and Trained Elderly Adults. JEPonline 2016;19(3):35-41. The purpose of this study was to develop an equation to estimate maximum strength (1-RM) in elderly adults based on anthropometric and strength parameters. Init...
Conference Paper
Full-text available
PURPOSE: The aim of this study was to investigate on changes in maximal force [one repetition maximum (1RM)] and maximal contractile [rate of force development (RFD)] evoked by nonlinear periodization strength training in elderly people. METHODS: Fifteen untrained healthy subjects (10 women = 69.07 ± 13.27 kg, 43.42 ± 8.03 %BF, 158.9 ± 6.78 cm, and...