Orlando Jesus Fernandes

Universidade de Évora | uevora · Department of Sport and Health

Few studies have evaluated the effect of a secondary motor task on the standing posture based on nonlinear analysis. However, it is helpful to extract information related to the complexity, stability, and adaptability to the environment of the human postural system. This study aimed to analyze the effect of two motor tasks with different difficulty...

Previous studies have reported that people with fibromyalgia (FM) could suffer from mitochondrial dysfunction. However, the consumption of muscle oxygen during physical exercise has been poorly studied. Therefore, this study aimed to explore the response of muscle oxygen during a fatigue protocol in people with FM and healthy controls (HC). In addi...

Research shows that exercise training programmes lead to several improvements in older adults’ health-related quality of life (HRQoL) and well-being. This study will examine the effects of an active retirement programme on Portuguese older adults, investigating its effects on body composition, physical fitness, HRQoL, and physical activity level (P...

One of the most discussed issues in handwriting is the question of when young children are (or not) ready to begin handwriting instruction. Several studies highlight the importance of early detection of graphomotor difficulties to better assist and remediate them in the first years of formal school. Also, it is necessary to understand how children...

Padel is an intermittent sport that has significantly increased its practice in the past years. Previous studies showed that physical demands significantly differed depending on the results of the match (win or lose). However, no previous studies have investigated the effects on the heart rate variability (HRV) of padel players. The present study e...

The present study aimed to analyse and compare the muscle activity of twelve participants (seven men and five women) (age 20.1 ± 0.9 years; height 170.5 ± 10 cm; body mass: 64.86 ± 8.3 kg) in two exercises, each with two variants: squat (dynamic and static) and plank (hands and elbows) in a stable environment on land and an unstable environment on...

With age, humans tend to lose sensitivity between neural and muscular actions in coordination with skeletal function (Suzuki et al., 2019). Loss of mobility, decreased muscle strength and balance deficit are factors that contribute to dependence and loss of autonomy (Bacha et al., 2016; Rosa, 2012). The central nervous system regulates sensory info...

Portuguese Airforce Pilots are healthy adults with a specific profession which requires efficiency of the vestibular system to maintain balance in the aircraft cockpit (1), as well as the capacity to have a fast response in stressful situations (2,3). Currently the Portuguese Airforce team does not have a mandatory exercise training protocol. The...

Introdução: O Padel é uma modalidade desportiva muito semelhante ao ténis. A sua prática tem aumentado de forma exponencial na última década, principalmente a prática amadora. À semelhança de outras modalidades desportivas, o Padel distingue-se por uma elevada exigência física, principalmente a nível cardiovascular, provocando alterações substancia...

In this study, we aimed to assess the countermovement jump (CMJ) using a developed instrument encompassing an off-the-shelf Inertial Measurement Unit (IMU) in order to analyze performance during the contraction phase, as well as to determine the jump height and the modified reactive strength index (RSImod), using force plate (FP) data as reference....

Analysis of the center of pressure (CoP) during cognitive or motor dual-tasking is widely used to characterize postural control. Most studies use traditional measures of CoP to quantify postural control, but given its complexity, nonlinear analysis of CoP is of growing interest in the area. This study aims to analyze CoP behavior in healthy young a...

The purpose of this study was to calculate the effects of exercise programs on phase angle (PhA) in older people. A systematic review was undertaken in multiple electronic databases in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-analyses statement guidelines for the purposes of selecting randomized controlled trial...

Heart rate variability (HRV) and performance response during emergency flight maneuvers were analyzed. Two expert pilots (ages 35 and 33) and two rookie pilots (ages 25) from the Portuguese Air Force participated in this case–control report study. Participants had to complete the following emergency protocols in a flight simulator: (1) take-off eng...

The trot-up classification agreement among FEI-EOVs using the ABC endurance scale was only moderate, however it improved to good with the LWP trotting style • FEI-EOVs considered a grade 2 unacceptable to compete. • The mismatch between subjective and objective evaluations warrants further investigation. • Thirty-two endurance horses in training ha...

This study aims to verify the validity of the Push Band 2.0 (PB2.0) device on the reactive strength index (RSI) measurement, using a force plate (FP) and an optical sensor device, OptoJump (OPT), as a reference. Twenty trained athletes performed 60 drop jump trials with a height box of 30 cm. A randomized repeated measures study was conducted durin...

Training in the older adult led to improvements in body composition, muscle strength, agility, flexibility, or even improvements in the participants' health. However, no study has evaluated how sensorimotor training affects all the abilities, as well as gait variability and postural control. This study will try to explore the effect of a program ba...

Introduction Chronic ankle instability (CAI) is characterized by the occurrence of repetitive inversion mechanism of the ankle, resulting in numerous ankle sprains. CAI occurs in approximately 70% of patients with a history of a lateral ankle sprain. Many causes of functional ankle instability have been postulated and include deficits in propriocep...

Handwriting is a movement, with variability. Despite being in an increasingly digital era, handwriting has not lost its importance as it continues to be used in some daily tasks as well as in some moments of academic evaluation. We used the nonlinear dynamic parameter approximate entropy (ApEn) to assessing pattern of regularity of respective kinem...

One of the most discussed issues in handwriting is the question of when young children are (or not) ready to begin handwriting instruction. Several studies highlight the importance of early detection of grapho�motor difficulties to better assist and remediate them in the first years of formal school. Also, it is necessary to understand how children...

This systematic review aimed to provide information on the effects of exercise programs on sensorimotor skills during the aging process, with relevance after the occurrence of COVID-19.

Human ageing involves several physiological impairments—in particular, a decrease in sensorimotor function and changes in the nervous system reduce muscle strength, power, balance, and functional capacity performance. Preventive strategies are essential to ensure the quality of life of the elderly. High-speed resistance training (HSRT) may be an ef...

Padel, an increasingly popular sport, presents some associated cardiovascular risks, which can be prevented by heart rate variability (HRV) monitoring. However, there is no study worldwide that characterizes HRV during padel games. Therefore, this study aims to monitor HRV responses and characterize them using linear and non-linear metrics at three...

Introduction. This study aimed to propose a categorization of body postures and to provide indexes/scores for the postural patterns. Methods. The body posture of the 3 spinal regions in 180 asymptomatic young people, mean age: 16.1 (0.77) years, was evaluated quantitatively in the sagittal plane (cinemetry and the curvature index). The same images...

Background Many causes of chronic ankle instability (CAI) have been postulated and include deficits in proprioception, impaired neuromuscular firing patterns, reduced balance and postural control. Balance control can be studied with the traditional analysis of centre of pressure (CoP) displacement and nonlinear analysis of its variability. Objecti...

This study aimed to correlate the vertical acceleration obtained by an Inertial Measurement Unit (IMU) and the biomechanical parameters obtained by a force plate (FP). Eight ath-letes (six males and two females; Aged 26±3.61; body mass: 73.19±8.96Kg; and height: 1.77±0.08m) with international representation by their countries were included in the s...

This study aimed to determine the temporal parameters in the rotational shot-put phases and the shot-put release conditions in elite athletes. To analyze your correlation with the result and to analyze the differences between the male and female athletes. Eight elite ath-letes were analyzed. The 3D kinematic analysis was applied, through two high-s...

Background: Foot postural alignment has been associated with altered gait pattern. This study aims to investigate gait kinematic differences in flatfoot subjects’ regarding all lower limb segments compared to neutral foot subjects. Methods: A total of 31 participants were recruited (age: 23.26 yo ± 4.43; height: 1.70 m ± 0.98; weight: 75.14 kg ± 14...

The inherent complexity of sport praxis requires the mutual integration of the different, but complementary, paradigms to satisfy the daily challenges faced by the practitioners. Monitoring such praxis is also needed so that we can intentionally and continuously adapt it according to the team's needs. Using an insider action-research (AR) design im...

Scientific researchers have sought to comprehend how players synchronize actions during successful competitive sport performance. A deeply, and contextualized interpretation of this process could be reached, and enriched, by integrating Constraint-led (ecological) and Step-Game (constructivist) approaches. Adopting an action-research (AR) design ov...

Although sleep quality disorders can have a negative effect on postural control, studies about this subject are scarce. The aim of this study is to assess the differences in standing posture performance during dual tasking between healthy young adults with a good and poor sleep quality. Thirty-five healthy participants (23.09 ± 3.97 years) performe...

Cerebral palsy (CP) treatment includes physical therapy and various complementary therapies to the standard clinical treatment. However, there are not many reviews that focus on the methods used and evaluation procedures. This study aims to analyze which tools are most suitable for the evaluation and methodology of patients with CP treated with phy...

The aims were: (1) to determine the accuracy and time-consuming of the automatic digitalization feature of 3D motion analysis systems; and (2) to determine the reliability of the 3D position when a football player performed a hard kick with spin. Four high-speed cameras (Casio ZR200 (512x384)) with a 240 Hz field rate were used. Automatic scanning...

Running is one of the most popular types of physical activity and can be optimised by increasing the movement patterns efficiency. Running biomechanics involves synchronous movements of the entire kinetic chain with a considerable inter-individual variability in lower limb kinematics and the influence of individuals characteristics. This chapter wi...

Combining Constraint-led (ecological) and Step-Game (constructivist) approaches through an Action-Research (AR) design conducted throughout a competitive volleyball season, this study aimed to: (i) analyse the impact of increased tactical complexity on lateral and longitudinal collective synchronisation tendencies during defensive and offensive cou...

An Action-Research (AR) design was implemented throughout a competitive season in which Constraint-led and Step-Game approaches were combined. This intervention study investigated the impact of increased performance complexity on emergence of counterattacking synchronisation tendencies in team players (laterally and longitudinally on court) at diff...

When executing a sport-specific movement, athletes cannot use all perceptual resources to control their actions. The complexity of a basketball match, demands that individuals command their attention towards the context to make decisions. The dependency on the perceptual sources to control a movement should be kept to a minimum. During a match due...

Objective: To quantify and compare the electromyographic activity of 10 muscles in three pullover exercises. Methods: 15 healthy men, with at least two years of experience in resistance training, executed in random order six repetitions with 60% of 1 Maximum Repetition for three different pullover exercises: lying on a step with a barbell, grip 100...

The developmental coordination disorder (DCD) is a motor disorder without neural compromising that affects 5-6% of children in school-age (Zwicker, Missiuna, Har-ris, & Boyd, 2012). The study aims to identify and describe the prevalence of probable DCD in Rio Maior and São João da Ribeira in children with 3 and 4 years old. It was applied MABC-2 (H...

There is an imperative need to alleviate the actual and predictably harder burden of spine disorders and particularly the share due to chronic nonspecific low back pain, both at the individual and community-based viewpoint. Studies on global health trends charge a relevant part of the onus to the proposed invasive procedures, raising concern over i...

HOW IMPORTANT IS KNEE POSITION ON LANDING FOR ANKLE SPRAIN? Authors Maria António CastroInstituto Politécnico de Coimbra - Coimbra Health School, Coimbra, PortugalUniversidade de Coimbra, Coimbra, PortugalPubMed articlesGoogle scholar articles Orlando FernandesUniversidade de Évora, Évora, PortugalPubMed articlesGoogle scholar articles Manuel Antón...

Background In sports ankle sprains are responsible for most of the time lost in practice. In basketball, ankle sprains are not only a main injury but they also have a high tendency of re-injury. There is a special interest in finding risk factors that can be used to predict the ankle sprain occurrence and so prevent it. Joint position when contacti...

1. Introduction A traditional Chinese form of physical activity is Tai Chi Chuan (TCC). The basic TCC exercise is a series of graceful movements linked together in a continuous sequence so that the body is constantly shifting from foot to foot, with a lower center of gravity. Deep breathing and mental concentration are required to achieve harmon...

The aim of the current study was to analyse the effect of 10-week eccentric overload training on kinetic parameters during change of direction (COD) in U-19 football players. The outcome measured included relative peak braking (rPB) and propulsive force (rPF), contact time (CT), time spent during braking (BT) and propulsive phase (PT), relative tot...

Introduction: Over the past years, a few review papers about possibilities of using motion analysis systems in sport were published, but there are no articles that discuss this problem in the field of combat sports and martial arts. Aim: This study presents the diversity of contemporary motion analysis systems both, those that are used in scientifi...

The aims of this study were to analyse the effects of eccentric overload training (EOT) on kinetic parameters during change of direction (COD) and performance related to sprinting and jumping abilities. 20 male soccer players performed 2 different protocols: 1) 5-min cycling warm-up and 2) 5-min cycling warm-up+YoYo half-squat exercise. The outcome...

In tennis, the relative positioning of players on court constrains their opportunities to perform successful actions. In this study we proposed and validated an empirical function that captures the spatial-temporal relationship between tennis players during competitive performance. This parameter, termed goal-directed displacement index (GDD Index)...

Abstract Ecological dynamics of decision-making in the sport of sailing exemplifies emergent, conditionally coupled, co-adaptive behaviours. In this study, observation of the coupling dynamics of paired boats during competitive sailing showed that decision-making can be modelled as a self-sustained, co-adapting system of informationally coupled osc...

This study aimed to quantify the time-motion demands and intra-team movement synchronization during the pre-season matches of a professional soccer team according to the opposition level. Positional data from 20 players were captured during the first half of six pre-season matches of a Portuguese first league team. Time-motion demands were measured...

Presently, coaches and researchers need to have a better comprehension of the kinesiological parameters that should be an important tool to support teaching methodologies and to improve skills performance in sports. The aim of this study was to (i) identify the kinematic and neuromuscular control patterns of the front kick (mae-geri) to a fixed tar...

The purpose of this study was to analyze the informational constraints that influence the dynamics of 1v1 situations in football. Specifically, we analyzed the contribution of interpersonal distance and relative velocity to explain phase transitions that occurred between stable and unstable coordinative states in 1v1 in football. Participants were...

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Purpose: The instep soccer kick is a pre-programmed ballistic movement with a typical agonist-antagonist coordination pattern. The coordination pattern of the kick can provide insight into deficient neuromuscular control. The purpose of this study was to investigate knee kinematics and hamstrings/quadriceps coordination pattern during the knee bal...

Abstract This study investigated the acute effect of a low-volume static and dynamic stretching on maximal isometric peak force (MIPF), time to maximal isometric force (TMIF), rate of force production (RFP) and average amplitude of the surface EMG (AvgEMG) of the main agonist muscles acting on the bench press maximum isometric force exercise. Thirt...

Complex systems in nature are those with many interacting parts, all capable of influencing global system outcomes. There is a growing body of research that has modeled sport performance from a complexity sciences perspective, studying the behavior of individual athletes and sports teams as emergent phenomena which self-organise under interacting c...

A randomized, controlled trial was conducted to determine the effect of Pilates-based exercise on postural alignment. Seventy-four adult women (mean age ± SD, 34.9 ± 16.4 years) were randomized to a Pilates-based mat class (n = 40) or a control group (n = 34). Pilates-based exercise participants were taught the Initial Mat of Body Control Pilates f...

There is a lack of studies regarding EMG temporal analysis during dynamic and complex motor tasks, such as golf swing. The aim of this study is to analyze the EMG onset during the golf swing, by comparing two different threshold methods. Method A threshold was determined using the baseline activity recorded between two maximum voluntary contraction...

Background: The shoulder external rotator muscles and the different portions of the trapezius muscle have never been studied in exclusivity. However, the literature has provided several exercises which have been used in this study. Purpose: To quantify electromyographic activity of the shoulder external rotator muscles and the upper, middle and low...

Este trabalho teve como objectivo realizar a análise cinemática do putting em jogadores peritos e verificar se existiam diferenças estatisticamente significativas nas variáveis de processo de execução motora (e.g., amplitude, velocidade, aceleração e tempo de duração do movimento) como consequência do afastamento da bola ao buraco. A amostra foi co...

In this paper we investigated how interpersonal coordination tendencies of players in Futsal constrained performance of passing actions. To achieve this aim, we digitized 24 digital video film clips of attacking phases in competitive Futsal games. Values of interpersonal distance between players were recorded from the moment at which a teammate per...

DOI: http://dx.doi.org/10.5007/1980-0037.2012v14n5p545 Considering that some studies suggest that shoulder rotators muscle imbal­ances are related to joint pain and injury, and that there are no normative data for young swimmers, the aim of this study was: i) to describe the muscle balance, fatigue and isokinetic strength profile of the shoulder r...

The influence of different instructional constraints on movement organisation and performance outcomes of the penalty kick (PK) was investigated according to participant age. Sixty penalty takers and twelve goalkeepers from two age groups (under 15 and under 17) performed 300 PKs under five different task conditions, including: no explicit instruct...

To succeed in competitive environments, players need to continuously adjust their decisions and actions to the behaviour of relevant others. Players' interactions demand ongoing decisions that are constrained by what is previously defined (e.g., coaches' prescriptions that establish 'what' to do) and by information that is available in the context...

Considering that some studies suggest that shoulder rotators muscle imbal-ances are related to joint pain and injury, and that there are no normative data for young swimmers, the aim of this study was: i) to describe the muscle balance, fatigue and isokinetic strength prole of the shoulder rotators in young swimmers; ii) to compare the results betw...