Lucas B R Orssatto

Lucas B R Orssatto
Queensland University of Technology | QUT · School of Exercise & Nutrition Sciences

Doctor of Philosophy

About

97
Publications
14,814
Reads
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386
Citations
Citations since 2016
95 Research Items
386 Citations
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140
Introduction
Lucas B R Orssatto currently works at the School of Exercise and Nutrition Sciences, Queensland University of Technology. Lucas does research in neuromuscular adaptations and aging.
Additional affiliations
March 2016 - March 2018
Federal University of Santa Catarina
Position
  • Master's Student

Publications

Publications (97)
Article
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)....
Article
Full-text available
Key points: Motor neuronal persistent inward currents (PICs) are facilitated via diffuse neuromodulation and deactivated by local inhibition to ensure motor units discharge at required times and frequencies, allowing a normal motor behaviour. PIC amplitudes appear to be reduced with ageing; however, it is not known whether PIC facilitation-inhibit...
Article
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...
Conference Paper
Full-text available
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,...
Preprint
Full-text available
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...
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)...
Article
Full-text available
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...
Article
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...
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...
Preprint
Full-text available
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...
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
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...
Article
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...
Article
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...
Article
Full-text available
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...
Article
Full-text available
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...
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...
Article
Full-text available
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...
Article
Full-text available
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...
Preprint
Full-text available
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...
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
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...
Article
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....
Preprint
Full-text available
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....
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
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...
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
Full-text available
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...
Article
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...
Conference Paper
Full-text available
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...
Article
Full-text available
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...
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...
Article
Full-text available
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...
Article
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...
Article
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...
Article
Full-text available
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...
Article
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...
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
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...
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 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...
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...
Conference Paper
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...
Conference Paper
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...
Conference Paper
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...
Conference Paper
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...
Article
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...
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
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...
Conference Paper
Full-text available
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 (...
Conference Paper
Full-text available
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...