Lucas B R Orssatto

Verified

Lucas verified their affiliation via an institutional email.

Learn more

Verified

Lucas verified their affiliation via an institutional email.

Learn more

• Doctor of Philosophy
• Research Fellow at The University of Queensland

Runners with Achilles tendinopathy have reduced neural drive to the gastrocnemius lateralis. Positioning feet-inwards (feet-in) can influence gastrocnemii activity in healthy individuals. Therefore, this study investigated if pointing (feet-in) during isometric plantarflexion would increase gastrocnemius lateralis electromyography root mean square...

This study examined the effects of core and muscle temperature on force steadiness and motor unit discharge rate (MUDR) variability after a hot-water immersion session. Fifteen participants (6 women; 25 ± 6 years) completed neuromuscular assessments before and after either 42 °C (hot) or 36 °C (control) water immersion. Force steadiness was measure...

Intramuscular temperature kinetics can provide insightful information for exercise and environmental physiology research. However, currently, there are no consistent method descriptions or guidelines for muscle temperature assessment in the literature. Studies have reported a great variation in muscle temperature assessment, from 1.5 cm under the s...

Purpose To assess the effect of a remote handgrip contraction during wide-pulse high-frequency (WPHF) neuromuscular electrical stimulation (NMES) on the magnitude of extra torque, progressive increase in torque during stimulation, and estimates of the persistent inward current (PIC) contribution to motoneuron firing in the plantar flexors. Methods...

Aim Prediction intervals are a useful measure of uncertainty for meta‐analyses that capture the likely effect size of a new (similar) study based on the included studies. In comparison, confidence intervals reflect the uncertainty around the point estimate but provide an incomplete summary of the underlying heterogeneity in the meta‐analysis. This...

The world is experiencing increased frequency, duration, and severity of life-threatening heat extremes. Most hospitalizations and excess deaths during extreme heat events are associated with pre-existing diseases in older adults. As climate change persists, the global population ages, and the number of individuals with chronic diseases expands, mo...

Purpose: Investigate if caffeine consumption would change PIC contribution to motoneuron firing at increased contraction intensities and after repetitive sustained maximal contractions. Methods: Before and after the consumption of 6 mg/kg of caffeine or placebo, sixteen individuals performed isometric triangular-shaped ramp dorsiflexion contract...

Increased amplitude of persistent inward currents (PICs) is observed in pre‐symptomatic genetically modified SOD1 mice models of amyotrophic lateral sclerosis (ALS). However, at the symptomatic stage this reverses and there is a large reduction in PIC amplitude. It remains unclear whether these changes in PICs can be observed in humans, with cross‐...

Runners with Achilles tendinopathy (AT) have lower neural drive to gastrocnemius lateralis (GL) and it has been shown that modified foot position during plantarflexion activity affects motor unit discharge properties of GL . This paper tested the motor unit (MU) responses of GL and gastrocnemius medialis (GM) to feet-neutral and feet-in . We recrui...

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...

Nervous system deterioration is a primary driver of age‐related motor impairment. The motor neurones, which act as the interface between the central nervous system and the muscles, play a crucial role in amplifying excitatory synaptic input to produce the desired motor neuronal firing output. For this, they utilise their ability to generate persist...

Aim: Prediction intervals are a useful measure of uncertainty for meta-analyses that capture the likely effect size of a new (similar) study based on the included studies. This study aimed to: (i) estimate the proportion of meta-analysis studies that report a prediction interval in sports medicine, using medicine as a comparator; and (ii) estimate...

This study investigated the effects of high-intensity resistance training on estimates of the motor neuron persistent inward current (PIC) in older adults. Seventeen participants (68.5±2.8 years) completed a 2-week non-exercise control period followed by 6 weeks of resistance training. Surface electromyographic signals were collected using two 32-c...

Purpose: Examine the effects of 42°C hot-water immersion on muscle contraction function and motor unit discharge rates. Methods: Fifteen participants (24.9±5.6 years) performed neuromuscular assessments before, after, and ~15-min after either 90-min of 42°C or 36°C water immersion. Maximal voluntary contraction (MVC) assessment of knee extension...

Background Plyometric training can be performed through many types of exercises involving the stretch-shortening cycle in lower limbs. In the last decades, a high number of studies have investigated the effects of plyometric training on several outcomes in different populations. Objectives To systematically review, summarize the findings, and acce...

Introduction We tested two strategies that hypothetically increase serotonin availability (α-lactalbumin consumption and a remote submaximal handgrip contraction) on estimates of persistent inward currents (PICs) amplitude of soleus muscle in healthy participants. Methods With a randomised, double-blind, and cross-over design, 13 healthy participa...

Purpose The neurotransmitter serotonin has a strong effect on behaviour and motor control. Regarding motor control, serotonin contributes to the development of fatigue and is also involved in the ability of motor neurones to operate across a large range of forces (gain control). The consumption of tryptophan-rich supplements (such as α-lactalbumin)...

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)....

A well‐coordinated facilitation–inhibition control of motor neuronal persistent inward currents (PICs) via diffuse neuromodulation and local inhibition is essential to ensure motor units discharge at required times and frequencies. Present best estimates indicate that PICs are reduced in older adults; however, it is not yet known whether PIC facili...

This narrative review aims to describe and provide usage directions for different types of judo-specific assessments based on the physical demands required by athletes during training and competition. Several judo-specific tests have been developed to test different physical capacities (e.g., aerobic and anaerobic capacities, strength-endurance, et...

O fruto juçara é proveniente da palmeira Euterpe edulis Martius, uma espécie da Mata Atlântica brasileira, similar ao açaí. Este fruto pode proporcionar benefícios à saúde, em parte, devido à sua elevada atividade antioxidante, conferida principalmente pela presença de antocianinas. O consumo de alimentos ricos em antocianinas, como o fruto juçara,...

A well-coordinated control of motor neuronal persistent inward currents (PICs) via diffuse neuromodulation and local inhibition is essential to ensure motor units discharge at required times and frequencies. Current best estimates indicate that PICs are reduced in older adults; however, it is not yet known whether PIC facilitation-inhibition contro...

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)...

Nervous system maladaptation is linked to the loss of maximal strength and motor control with aging. Motor unit discharge rates are a critical determinant of force production; thus, lower discharge rates could be a mechanism underpinning maximal strength and motor control losses during aging. This meta-analysis summarized the findings of studies co...

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...

Objectives This study aimed to investigate short-interval intracortical inhibition (SICI) and muscle function in the Triceps surae of runners with mid-portion Achilles tendinopathy (AT). Methods Runners with (n=11) and without (n=13) AT were recruited. Plantar flexor isometric peak torque and rate of torque development (RTD) were measured using an...

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...

Objectives: This study aimed to investigate short-interval intracortical inhibition (SICI) and muscle function in the Triceps surae of runners with mid-portion Achilles tendinopathy (AT). Methods: Runners with (n=11) and without (n=13) AT were recruited. Plantar flexor isometric peak torque and rate of torque development (RTD) were measured using...

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...

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...

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...

Background: Different periodization models have been widely used to improve maximum and rapid force in aging adults. However, it is unclear if some specific model can influence the remarkable heterogeneity of responsiveness to rapid torque improvements following resistance training. Aims: Compare the effects of mixed session periodization (MSP) and...

Abstract: Background Diferent periodization models have been widely used to improve maximum and rapid force in aging adults. However, it is unclear if some specifc model can infuence the remarkable heterogeneity of responsiveness to rapid torque improvements following resistance training. Aims: Compare the efects of mixed session periodization (M...

Objective: High-intensity intermittent exercise (HIIE) may enhance the anti-inflammatory status. The juçara fruit juice (JFJ) has well-established antioxidant and anti-inflammatory properties. In this study, the effect of juçara fruit juice (JFJ) consumption on the inflammatory response to HIIE in physically active subjects was investigated. Method...

Objective: We reviewed and appraised the existing evidence of in vivo manifestations of residual force enhancement in human skeletal muscles and assessed, through a meta-analysis, the effect of an immediate history of eccentric contraction on the subsequent torque capacity of voluntary and electrically evoked muscle contractions. Methods: Our searc...

Diferentes tipos de programas de treinamento resistido resultam em diferente estresse metabólico e demandas cardiovasculares, o que poderia influenciar adaptações na modulação autonômica cardíaca. O estímulo preciso do treinamento resistido e os mecanismos responsáveis por promover a melhora na variabilidade da frequência cardíaca (VFC) não são cla...

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...

Objective To test the effects of hot-water immersion on the rapid force production and parameters of neuromuscular function in healthy adults. Design Cross-sectional study. Methods Fifteen healthy adults (24.9 ± 5.6 years; 178 ± 11.4 cm; 72.8 ± 16.2 kg) performed neuromuscular assessments before, after and ∼15 min after either 90 min of 42 °C (ho...

Manipulation of resistance training variables has been shown to have a substantial effect on muscular adaptations. A major variable in this process is exercise selection. In addition to the effectiveness of a given exercise to recruit the target muscle groups, safety considerations and individual comfort during execution of a lift should be conside...

Nervous system maladaptation is linked to the loss of muscle force production and motor control with aging. However, the mechanisms specifically underpinning these muscle functional limitations remain unclear. Motoneuron discharge rates are a critical determinant of force production and strongly impact motor control; thus, lower discharge rates cou...

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...

Prolonged (≥60 s) passive muscle stretching acutely reduces maximal force production at least partly through a suppression of efferent neural drive. The origin of this neural suppression has not been determined, however some evidence suggests that reductions in the amplitude of persistent inward currents (PICs) in the motoneurons may be important....

This study compared the differences in neural and muscular mechanisms related to explosive torque in chronically strength‐trained young and older men (>5 years). Fifty‐four participants were allocated into four groups according to age and strength training level: older untrained (n=14; 65.6±2.9 years), older trained (n=12; 63.6±3.8 years), young un...

Prolonged (≥60 s) passive muscle stretching acutely reduces maximal force production at least partly through a suppression of efferent neural drive. The origin of this neural suppression has not been determined, however some evidence suggests that reductions in the amplitude of persistent inward currents (PICs) in the motoneurons may be important....

Purpose This study compared sex-related affective responses during resistance training performed to concentric failure. Methods The study was a non-randomized trial (quasi-experimental study). Well-trained young participants were allocated into two groups according to sex (Women, n=7, 21.1±6.0 years, 57.6±5.0 kg; and Men, n=7, 28.3±5.7 years, 88.3...

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...

PurposeThis study investigated the relationship between habitual nutritional intake and the responsiveness of elderly individuals to resistance training.Methods Nineteen participants (66.0 ± 4.5 years) completed body composition (dual-energy X-ray absorptiometry), functional capacity (timed-up-and-go, stair ascent, and stair descent), and neuromusc...

Background The current literature indicates that functional capacity is associated with physical performance and body composition measurements in older adults. However, it is not clear which tests can best explain the functional capacity in this population. This study aimed to investigate the physical performance and body composition determinants o...

Introdução: O fruto juçara provém da palmeira Euterpe edulis Martius, uma espécie da Mata Atlântica brasileira. Devido à sua elevada atividade antioxidante, conferida especialmente pela presença de antocianinas, o fruto juçara pode oferecer proteção antioxidante durante o exercício. Objetivo: Avaliar o efeito do consumo agudo do suco de juçara (Eut...

Background: This study investigated the comparability between air displacement plethysmography (ADP), dual-energy X-ray absorptiometry (DXA), and bioelectrical impedance analysis (BIA) methods for body composition assessment and their correlations with physical performance in rugby players. Methods: Nineteen male elite players participated in th...

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...

This study aimed to evaluate the effects of juçara juice on oxidative stress biomarkers and fatigue in a high-intensity interval training (HIIT) session. Fifteen physically active men were assigned to drink 250 mL of juçara juice or water (control) 1 h before exercise. Blood samples were collected 1 h prior to exercise, immediately post exercise, a...

Power training has been suggested to be effective in improving strength, power, and functional capacity in older adults. However, there is still a lack of systematic investigations reporting its effectiveness for muscle hypertrophy. Thus, this study investigated the effect of power training on muscle hypertrophy and compared its magnitude with trad...

Objective: To investigate the effects of Photobiomodulation therapy (PBMT) on resistance training volume and discomfort of well-trained adults. Background: PBMT has been used to attenuate fatigue in several physical exercise topics. However, it is unclear if PBMT can increase volume and reduce discomfort in resistance training well-trained individu...

Objetivo: Verificar quais métodos de avaliação clínicos de força e potência muscular, e testes de desempenho físico funcionais estão correlacionados com o pico de torque isométrico e dinâmico dos extensores de joelho, e desenvolver equações preditivas que estimem o pico de torque isométrico e dinâmico em pessoas idosas. Métodos: Foram selecionados...

Objective: Investigate the acute effects of repeated combat sports matches on vertical jump and handgrip strength performance in grappling and striking modalities. Design: Systematic review. Methods: PubMed, Scopus, and Web of Science databases were searched. The following eligibility criteria for selecting studies were adopted: Population: Co...

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....

Reduced levels of functional capacity in older adults are related to lower quality of life, frailty, and sarcopenia, and can increase risks of falling, fractures and hospitalisation. Resistance training is an effective method to attenuate age-related functional declines. Based on the findings that muscle power and explosive strength are strongly as...

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...

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...

Introdução: A força rápida está relacionada com equilíbrio, funcionalidade e risco de quedas de idosos. Ela é determinada pela magnitude em que o sistema nervoso recruta unidades motoras e pela capacidade intrínseca do sistema musculotendíneo produzir força em um curto período de tempo. Entretanto, não está claro na literatura se a influência do si...

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...

Introdução: O envelhecimento acarreta redução na capacidade de recrutamento da unidade motoras rápidas, desta forma, a recuperação desta requer treinamentos específicos com característica de deslocamento de baixa carga, mas com um velocidade alta. Nos últimos anos, um tipo de treinamento que tem ganhado notoriedade, é o treinamento resistido basead...

Introduction: Periodized strength training (ST) is widely used to counteract rapid force production impairments during aging. Although the homogenous training background of this population, the effects may be highly individual. Nonetheless, there is a lack of information in regard to inter-individual neuromuscular responses among the ageing group a...

Introdução: Os testes neuromusculares e de capacidade funcional em idosos são utilizados para monitoramento do desempenho físico durante o envelhecimento em diferentes condições clínicas. Entretanto, seu resultado final pode ser influenciado por erros de medida do avaliador e/ou equipamento, e pela variabilidade de desempenho do avaliado. Entender...

Introdução: O envelhecimento acompanha perdas motoras que levam a diminuição da qualidade de vida dos idosos. Objetivos: Verificar quais métodos de avaliação de força e testes funcionais estão correlacionados com o pico de torque isométrico e dinâmico dos extensores de joelho, e desenvolver equações preditivas que estimem o pico de torque isométric...

Due to recent decade’s demographic changes with a greater proportion of elderly people in the world, physical independence among older adults is becoming increasingly more important. This mini-review summarizes and discusses neuromuscular adaptations in response to resistance training with different contraction velocities in untrained elderly. Slow...

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...

Background: Judo is a grappling sport that require a combination of powerful actions (e.g., throwing techniques) and aerobic capacity. Physical performance, body composition and somatotype influences athletes' performance. Problem and aim: Analyze the physical performance, body composition and somatotype from elite Colombian judokas and compare wit...

Background: Improvements of maximal and rapid force and muscle mass following resistance training can attenuate the deleterious effects of aging on neuromuscular function. These adaptations depend of training specificity. Maximal force improvements are optimized by greater intensities, hypertrophy by moderate, and rapid force by light to moderate (...

The aim of the present study was to investigate the effects of photobiomodulation therapy (PBMT) on resistance training volume and discomfort in well-trained subjects. Fourteen subjects (=7, 27.7±6.0 y; 57.6±5.0 kg; and =7, 28.3±5.7 y; 88.3±11.4 kg) volunteered to the present study. In the first laboratory visit, 12-repetition maximum (12-RM) test...

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...

Functional resistance training can increase strength, knee torque ratio, and functional performance in elderly women. The aim of the present study was to understand the effects of closed kinetic chain exercises with constant load on muscular strength, the knee torque conventional ratio (hamstring: quadriceps – H:Q), and functional capacity in the e...

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...

The aims of this pilot study were to verify which tests of muscle strength better explains the bone mineral content (BMC) of the femoral neck and lumbar spine and to develop predictive equations to estimate femoral neck and lumbar spine BMC. Twenty nine subjects aged 56 to 76 years (12 women and 17 men) participated in the study. The femoral neck a...

Understanding the influence of strength training intensity on subsequent recovery in elderly is important to avoid reductions in physical function during the days following training. Twenty-two elderly were randomized in two groups: G70 (65.9±4.8 years, n=11) and G95 (66.9±5.1, n=11). Baseline tests included maximum voluntary isometric contraction...

Background: Accuracy is essential to the validity of functional capacity measurements. Aim: To evaluate the error of measurement of functional capacity tests for elders and suggest the use of the technical error of measurement and credibility coefficient. Methods: Twenty elders (65.8 ± 4.5 years) completed six functional capacity tests that we...

The purpose of this study was to compare the effects of mixed session periodization (MSP) versus traditional periodization (TP) on strength, power, functional performance, and body composition in aging adults. Forty-five healthy aging adults were randomly divided into three groups: MSP, TP, and Control. Subjects were tested before the intervention...

Ageing leads to substantial force production capacity reductions, which is an indicator of frailty and disability, and a mortality predictor in elders. Understanding the age-dependent neuromuscular mechanisms underlying force reductions can optimize healthcare professionals’ exercise protocol choices for patients and allows researchers to investiga...

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...