Stephane Perrey

Université de Montpellier | UM1 · Faculté des Sciences du Sport (STAPS)

Recently, interest has been growing to understand the underlying dynamic directional relationship between simultaneously activated regions of the brain during motor task performance. Such directionality analysis (or effective connectivity analysis), based on non-invasive electrophysiological (electroencephalography-EEG) and hemodynamic (functional...

Background: Since the introduction (in 2006) of commercially available portable wireless muscle oximeters, the use of muscle near-infrared spectroscopy (NIRS) technology is gaining in popularity as an application to observe changes in muscle metabolism and muscle oxygenation during and after exercise or training interventions in both laboratory an...

Understanding the interactions between brain activity and behavior comprehensively in achieving optimal exercise performance in sports is still lacking. The existent research in this area has been limited by the constraints of sports environments and the robustness of the most suitable non-invasive functional neuroimaging methods (electroencephalog...

The movement occurring when a muscle exerts tension while lengthening is known as eccentric muscle action. Literature contains limited evidence on how our brain controls eccentric movement. However, how the cortical regions in the motor network are activated during eccentric muscle actions may be critical for understanding the underlying control me...

The emergence of the first Fitness-Fatigue impulse responses models (FFMs) have allowed the sport science community to investigate relationships between the effects of training and performance. In the models, athletic performance is described by first order transfer functions which represent Fitness and Fatigue antagonistic responses to training. O...

Background Following a stroke, brain activation reorganisation, movement compensatory strategies, motor performance and their evolution through rehabilitation are matters of importance for clinicians. Two non-invasive neuroimaging methods allow for recording task-related brain activation: functional near-infrared spectroscopy (fNIRS) and electroenc...

This symposium addresses the contributions and impacts of digital tools in high-level sport via combined perspectives in physiology, biomechanics, communication systems/electronics and computer science/data sciences.

Notio is a device based on a wind sensor which offers estimates of the CdA (drag coefficient multiplied by the area) of the pair cyclist and bike. Notio is used with a specific analysis software, which computes CdA estimates after a ride. The Aeroscale Company proposes a half-day service with their own wind sensor and experimental protocol, to also...

Dementia is a neurological disorder associated with aging that can cause a loss of cognitive functions, impacting daily life. Alzheimer's disease (AD) is the most common cause of dementia, accounting for 50–70% of cases, while frontotemporal dementia (FTD) affects social skills and personality. Electroencephalography (EEG) provides an effective too...

Eccentric, compared to concentric exercise, is proposed to involve different neuro‐motor processing strategies and a higher level of mental demand. This study compared eccentric and concentric cycling at matched perceived effort and torque for the mental demand and related‐cortical activation patterns. Nineteen men (30 ± 6 years) performed four dif...

The emergence of consciousness is one of biology's biggest mysteries. During the last two decades, a major effort has been made to identify the neural correlates of consciousness, but in comparison, little is known about the physiological mechanisms underlying first-person subjective experience. Attention is considered the gateway of information to...

Douches et bains glacés n'ont pas que des avantages après l'effort

Frankfurt 2023 - Expand the horizon of Near Infrared Spectroscopy KeyNote: Evaluating brain functioning with f/NIRS in sports: opportunities and challenges

Objectives Evaluate the ability of predicting the ratings of perceived exertion (RPE) from the external load variables in professional soccer players through a chronological perspective (i.e., past features values are considered additional features) through machine learning models by considering the playing position. Design Prospective cohort stud...

This Frontiers in Human Neuroscience: Brain Imaging and Stimulation Research Topic includes six contributions (four original and two case reports) from a total of 28 co-authors. Efforts were centered around the effects of tCS when applied to M1 or cerebellum to improve upper- or lower-extremity locomotor or musculoskeletal functions in healthy indi...

L'analyse des données est de plus en plus présente dans le football https://theconversation.com/football-quand-les-donnees-se-mettent-au-service-de-la-performance-199318

Physical neuroergonomics can sketch some potentially fruitful new directions for crossing researches in biomechanics, neurophysiology, physiology, sport sciences, data science, neuroimaging and neurosciences reflecting physical processes. The first grand challenge is focused on the use of small, ubiquitous sensors and/or innovative methods for perf...

While the importance of physical abilities is noncontested to perform in elite sport, more focus has recently been turned toward cognitive processes involved in sport performance. Practicing any sport requires a high demand of cognitive functioning including, but not limited to, decision-making, processing speed, working memory, perceptual processi...

Healthy aging leads to poorer performance in upper limb (UL) daily living movements. Understanding the neural correlates linked with UL functional movements may help to better understand how healthy aging affects motor control. Two non-invasive neuroimaging methods allow for monitoring the movement-related brain activity: functional near-infrared s...

Unexpected external perturbation influences team performance through its coordination ability. Given the existence of brain rhythms synchronization in two individuals cooperating together, this study aimed at testing the effect of a perturbation on the neurophysiological coordination. Forty-two participants (21 dyads) divided in two groups (Control...

NIRS method presents a unique opportunity to measure brain functioning in a continuous, real-time, and nonintrusive manner for multiple neuroergonomics scenario, as encountered in sports. Sport is currently a suitable but not underlined and undefined applied domain for neuroergonomics. Current wearable NIRS monitors growing in availability and popu...

Eccentric, compared to concentric muscle contraction, is thought to be attributed to different strategies of neuro-motor processing and a higher level of mental demand. This study aimed to evaluate the mental demand and related-cortical activation patterns to eccentric and concentric cycling at matched perceived effort and torque. Nineteen healthy...

Background: Transcranial direct current stimulation (tDCS) has emerged as a promising and feasible method to improve motor performance in healthy and clinical populations. However, the potential of tDCS to enhance sport-specific motor performance in athletes remains elusive. Objective: We aimed at analyzing the acute effects of a single anodal t...

The object of this study is to put forward uncertainty modeling associated with missing time series data imputation in a predictive context. We propose three imputation methods associated with uncertainty modeling. These methods are evaluated on a COVID-19 dataset out of which some values have been randomly removed. The dataset contains the numbers...

Purpose: Repeated-sprint training in hypoxia (RSH) leads to great improvements in anaerobic performance. However, there is no consensus about the optimal level of hypoxia that should be used during training to maximize subsequent performances. This study aimed to establish whether such an optimal altitude can be determined and whether pulse oxygen...

Personne, malheureusement, n'échappe à la fatigue. En bonne santé ou touchés par une pathologie chronique, simple quidam ou athlète de haut niveau, après une journée de travail intense, nous sommes tous confrontés à cette sensation de ne plus avoir les ressources suffisantes pour continuer à travailler, réfléchir, faire du sport…

In recent years, neuroscientists have been interested to the development of brain-computer interface (BCI) devices. Patients with motor disorders may benefit from BCIs as a means of communication and for the restoration of motor functions. Electroencephalography (EEG) is one of most used for evaluating the neuronal activity. In many computer vision...

Contribution to the field We hosted a special research topic issue for Frontiers in Neuroergonomics that focused on brain mechanisms underpinning physical movement and exercise. In total, 8 papers were accepted totalling 31 authors that covered three main domains: 1) Methods to elucidate fine motor control, 2) Exercise-related brain adaptations, an...

This study aims to predict individual Acceleration-Velocity profiles (A-V) from Global Navigation Satellite System (GNSS) measurements in real-world situations. Data were collected from professional players in the Superleague division during a 1.5 season period (2019–2021). A baseline modeling performance was provided by time-series forecasting met...

Synopsis: Unexpected external perturbation influences team performance through its coordination ability. Given the existence of brain rhythms synchronization in two individuals cooperating together, this study aimed at testing the effect of a perturbation on the neurophysiological coordination. Forty-two participants (21 dyads) divided in two grou...

In recent years, neuroscientists have been interested to the development of brain-computer interface (BCI) devices. Patients with motor disorders may benefit from BCIs as a means of communication and for the restoration of motor functions. Electroencephalography (EEG) is one of most used for evaluating the neuronal activity. In many computer vision...

In post-stroke rehabilitation unit, upper limb (UL) function recovery is a subject of major interest to facilitate patient’s autonomy in everyday life. This recovery is deeply linked to plastic brain reorganisation. A better understanding of the brain-movement characteristics could help for guiding therapeutic interventions. Two neuro-imagery metho...

Background: Transcranial direct current stimulation (tDCS) has emerged as a promising and feasible method to improve motor performance in healthy and clinical populations. However, the potential of tDCS to enhance sport-specific motor performance in athletes remains elusive. Objective: We aimed at analyzing the acute effects of a single anodal tDC...

Notre espèce est acclimatée à un monde placé sous le joug d'une gravité constante-en l'occurrence, une force d'accélération omniprésente née de l'attraction terrestre (l'unité de pesanteur terrestre, notée g, valant 9,81 m/s 2). Il existe toutefois des circonstances où notre corps est soumis à plus fort que la gravité terrestre classique… C'est là...

This study aims to predict individual Acceleration-Velocity profiles (A-V) from Global Navigation Satellite System (GNSS) measurements in real-world situations. Data were collected from professional players in the Superleague division during a 1.5 season period (2019-2021). A baseline modeling performance was provided by time-series forecasting met...

Appropriate training burden monitoring is still a challenge for the support staff, athletes, and coaches. Extensive research has been done in recent years that proposes several external and internal indicators. Among all measurements, the importance of cognitive factors has been indicated but has never been really considered in the training monitor...

Interest for neuromodulation, and transcranial random noise stimulation (tRNS) in particular, is growing. It concerns patients rehabilitation, but also healthy people who want or need to improve their cognitive and learning abilities. However, there is no consensus yet regarding the efficacy of tRNS on learning and performing a complex task. In par...

[This corrects the article DOI: 10.1371/journal.pcbi.1009386.].

Executive functions are important for successful accomplishment of walking tasks, particularly during a dual task. Over the past few years, several studies investigated prefrontal cortex activity under different walking conditions in older adults with functional near infrared spectroscopy (fNIRS). However, little is known about changes in dorsolate...

This study aims to provide a transferable methodology in the context of sport performance modelling, with a special focus to the generalisation of models. Data were collected from seven elite Short track speed skaters over a three months training period. In order to account for training load accumulation over sessions, cumulative responses to train...

Numerous studies have shown that working memory modulates every frequency band’s power in the human brain. Yet, the question of how the highly distributed working memory adapts to external demands remains unresolved. Here, we explored frequency band modulations underlying working memory load, taking executive control under account. We hypothesized...

Introduction Parkinson’s disease (PD) leads to a progressive loss of locomotor automaticity. Consequently, PD patients rely more on executive resources for the control of gait, resulting in increased prefrontal activity while walking. Exercise-based training programs may improve automaticity of walking and reduce prefrontal activity in this populat...

Outline of my talk is focused on results based on the brain responses in the context of sport performances. Two sport categories are distinguished, namely, closed skill sports (CSS) and open skills sports (OSS); OSS (e.g., basketball, table tennis) require players to react in an unpredictable and changing externally paced environment while CSS are...

Background After a stroke, 80% of the chronic patients have difficulties to use their paretic upper limb (UL) in activities of daily life (ADL) even after rehabilitation. Virtual reality therapy (VRT) and anodal transcranial direct current stimulation (tDCS) are two innovative methods that have shown independently to positively impact functional re...

Transcranial direct current stimulation (tDCS) has been shown to evoke hemodynamics response; however, the mechanisms have not been investigated systematically using systems biology approaches. Our study presents a grey-box linear model that was developed from a physiologically detailed multi-compartmental neurovascular unit model consisting of the...

BACKGROUND: Aerobatic pilots must withstand high and sudden acceleration forces (Gz) up to 10 Gz. The physiological consequences of such a succession of high and abrupt positive and negative Gz on the human body over time remain mostly unknown. This case report emphasizes changes in physiological factors such as cerebral oxygenation and heart rate...

In this study, we examined how changes in task difficulty was modulating functional brain activation and effective connectivity in some important brain areas involved in working memory (i.e., the medial and dorsolateral prefrontal cortex, mPFC and dlPFC).

Despite a growing number of functional MRI studies reporting exercise-induced changes during cognitive processing, a systematic determination of the underlying neurobiological pathways is currently lacking. To this end, our neuroimaging meta-analysis included 20 studies and investigated the influence of physical exercise on cognition-related functi...

The improvement of exercise performance in sports not only involves the enhancement of physical strength, but also includes the development of psychological and cognitive functions. There is an increasing body of evidence to show that physical exercise is a powerful way to improve a number of aspects of cognition and brain function at the systemic...

Background After a stroke, 80% of the chronic patients have difficulties to use their paretic upper limb (UL) in activities of daily life (ADL) even after rehabilitation. Virtual reality therapy (VRT) and anodal transcranial direct current stimulation (tDCS) are two innovative methods that have shown independently to positively impact functional re...

Special Issue Information The main goal of systems neuroscience is to understand how the brain controls behavior. With the advent of neuroimaging technologies and transcranial stimulation protocols, it has become possible to study the functional brain correlates of behavior and underlying cognitive and sensorimotor functions’ performance. Acute an...

Although endurance running (ER) seems to be a simple repetitive exercise, good ER performance also requires and relies on multiple cognitive and motor control processes. Most of previous neuroimaging studies on ER were conducted by using a single MRI modality, yet no multimodal study to our knowledge has been performed in this regard. In this study...

This study aims to provide a transferable methodology in the context of sport performance modelling, with a special focus to the generalisation of models. Data were collected from seven elite Short track speed skaters over a three months training period. In order to account for training load accumulation over sessions, cumulative responses to train...

Editorial manuscript of the Special Issue "Studying Brain Activity in Sports Performance"

Background: Walking becomes more and more degraded as Parkinson's Disease (PD) progresses. Previous research examined factors contributing to this deterioration. Among them, changes in brain cortical activity during walking have been less studied in this clinical population. Objectives: This study aimed to: (1) investigate changes in dorsolateral p...

A single session of priming cathodal transcranial direct current stimulation (tDCS) prior to anodal tDCS (c-a-tDCS) allows cumulative effects on motor learning and retention. However, the impact of multiple sessions of c-a-tDCS priming on learning and retention remains unclear. Here, we tested whether multiple sessions of c-a-tDCS (over 3 consecuti...

Objective: The current study aimed at comparing the effects of Tai Chi (a motor-cognitive exercise) with walking (an exercise without cognitive demands) on cognitive performance, brain structure, and brain function in the elderly. Methods: This cross-sectional study included 42 healthy elderly women within two groups: Tai Chi (n = 20; mean age =...

Background The beneficial effects of acute exercise on executive function have been well-documented, but the influence of cardiorespiratory fitness on this effect requires further investigations, especially using imaging technique. This study aimed to examine the effects of cardiorespiratory fitness on acute exercise-induced changes on behavioral p...

Transcranial direct current stimulation (tDCS) has been shown to evoke hemodynamics response; however, the mechanisms have not been investigated systematically using systems biology approaches. We postulate that such a mechanistic understanding of the hemodynamics response, called cerebrovascular reactivity (CVR) to tDCS, can facilitate adequate de...

Transcranial direct current stimulation (tDCS) has been shown to evoke hemodynamics response; however, the mechanisms have not been investigated systematically using systems biology approaches. We postulate that such a mechanistic understanding of the hemodynamics response, called cerebrovascular reactivity (CVR) to tDCS, can facilitate adequate de...

The mechanism of action for the cerebral vasculature hemodynamic response to the electric field effects during transcranial direct current stimulation (tDCS) has been less explored. We postulate that such a mechanistic understanding of the cerebrovascular reactivity (CVR) to tDCS can facilitate adequate tDCS dosing to facilitate cognitive rehabilit...

The objective of this article is to compare three approaches of missing data management in a classification context with sequential labels at variable time steps. The data concern the longitudinal monitoring of twenty-seven professional soccer players in terms of training schedules and perceived internal load. One approach without imputation uses t...

The large amount of features recorded from GPS and inertial sensors (external load) and well-being questionnaires (internal load) can be used together in a multi-dimensional non-linear machine learning based model for a better prediction of non-contact injuries. In this study we put forward the main hypothesis that the use of such models would be a...

Objective The current study aimed at determining effects of Tai Chi as an example of a combined motor-cognitive exercise relative to regular walking as an example of an exercise without cognitive demands on cognitive functioning and the functional and structural integrity of the brain in the elderly. Methods Healthy elderly women with at least 6 y...

This study assessed the Stryd running power meter validity at sub-maximal speeds (8 to 19 km/h). Six recreational runners performed an incremental indoor running test. Power output (PO), ground contact time (GCT) and leg spring stiffness (LSS) were compared to reference measures recorded by portable metabolic analyser, force platforms and motion ca...

Despite a growing number of functional MRI studies reporting exercise-induced changes during cognitive processing, a systematic determination of the underlying neurobiological pathways is currently lacking. To this end, our neuroimaging meta-analysis included 20 studies and investigated the influence of exercise on cognition-related functional brai...