Catherine Mercier

Catherine Mercier
Laval University | ULAVAL · Department of Rehabilitation

Ph.D.

About

149
Publications
18,687
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2,692
Citations
Additional affiliations
June 2005 - present
Laval University
June 2005 - present
Centre interdisciplinaire de recherche en readaptation et en integration sociale
Position
  • Institut de réadaptation en déficience physique de Québec
June 2005 - present

Publications

Publications (149)
Article
Introduction: Low back pain (LBP) often modifies spine motor control, but the neural origin of these motor control changes remains largely unexplored. This study aimed to determine the impact of experimental low back pain on the excitability of cortical, subcortical, and spinal networks involved in the control of back muscles. Method: Thirty hea...
Article
Introduction: The COVID-19 pandemic and associated restrictive measures have caused important disruptions in economies and labour markets, changed the way we work and socialise, forced schools to close and healthcare and social services to reorganise. This unprecedented crisis forces individuals to make considerable efforts to adapt and will have...
Article
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Background Altered movement patterns have been proposed as an etiological factor for the development of musculoskeletal pain. Fatigue influences upper limb kinematics and movement performance which could extend to the contralateral limb and potentially increasing risk of injury. The aim of this study was to investigate the impact of fatigue at the...
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Background Experimental pain during gait has been shown to interfere with learning a new locomotor task. However, very few studies have investigated the impact of clinical pain on motor learning due to the challenges associated with clinical populations. Objective The first objective of this proof-of-concept study was to determine the feasibility...
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Adults living with cerebral palsy (CP) report bimanual and unimanual difficulties that interfere with their participation in activities of daily living (ADL). There is a lack of quantitative methods to assess the impact of these motor dysfunctions on the relative use of each arm. The objective of this study was to evaluate the concurrent and discri...
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Background The 3D printing technology allows to produce custom shapes and add functionalities to foot orthoses which offers better options for the treatment of flatfeet. This study aimed to assess the effect of 3D printed foot orthoses stiffness and/or a newly design posting on muscle activity, plantar pressures, and center of pressure displacement...
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The purpose of this scoping review was to examine the literature on the use of anti-gravity treadmills and its effects on lower-limb motor functions in children and adolescents with locomotor impairments. Method: Four databases (MEDLINE, CINAHL, Embase, Web of Science) were searched for articles from inception to August 2021. Inclusion criteria wer...
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Fibromyalgia is a chronic pain syndrome characterized by sensorimotor deficits and distortions of body representation, that could both be caused by alterations in sensory processing. Several studies suggest a hypersensitivity to various sensory stimulations in fibromyalgia but results on detection of both noxious and non-noxious tactile stimulation...
Preprint
Full-text available
The purpose of this scoping review was to examine the literature on the use of anti-gravity treadmill and its effects on lower limb motor functions in children and adolescents with locomotor impairments. Four databases (MEDLINE, CINAHL, Embase, Web of Science) were searched for articles from inception to August 2021. Inclusion criteria were: (1) ex...
Article
Different directions of transcranial magnetic stimulation (TMS) can activate different neuronal circuits. While posteroanterior current (PA-TMS) depolarizes mainly interneurons in primary motor cortex (M1), an anteroposterior current (AP-TMS) has been suggested to activate different M1 circuits and perhaps axons from the premotor regions. Although...
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Background: People with chronic shoulder pain have been shown to present with motor adaptations during arm movements. These adaptations may create abnormal physical stress on shoulder tendons and muscles. However, how and why these adaptations develop from the acute stage of pain is still not well-understood. Objective: To investigate motor adap...
Article
Pain inf luences both motor behavior and neuroplastic adaptations induced by physical training. Motor imagery (MI) is a promising method to recover motor functions, for instance in clinical populations with limited endurance or concomitant pain. However, the inf luence of pain on the MI processes is not well established. This study investigated whe...
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Individuals with cerebral palsy have difficulties performing activities of daily living. Beyond motor execution impairments, they exhibit motor planning deficits contributing to their difficulties. The objective of this review is to synthesize the behavioral evidence of motor planning deficits during an upper limb motor task in children, adolescent...
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Motor imagery (MI) is usually facilitated when performed in a congruent body position to the imagined movement, as well as after actual execution (AE). A lower-limb amputation (LLA) results in important structural and functional changes in the sensorimotor system, which can alter MI. In this study, we investigated the effects of body position and A...
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Aim To synthetize studies assessing somatosensory deficits and alterations in cerebral responses evoked by somatosensory stimulation in individuals with cerebral palsy (CP) compared to typically developing individuals. Method A scoping review of the literature was performed in the MEDLINE, Embase, PsycInfo, CINAHL, Evidence-Based Medicine Reviews,...
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People living with cerebral palsy (CP) exhibit motor and sensory impairments that affect unimanual and bimanual functions. The importance of sensory functions for motor control is well known, but the association between motor and sensory functions remains unclear in people living with CP. The objective of this systematic review was to characterize...
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The origin of sensory disturbances in complex regional pain syndrome (CRPS) remains unclear. It has been hypothesized that such disturbances are due to attentional effects and/or sensorimotor integration deficits. If sensory disturbances are explained by sensorimotor integration deficits, they would be expected to be specific in terms of the catego...
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People with fibromyalgia (FM) have movement-related fear impacting on daily activities. While virtual reality has been used as a distractor to promote exercise, it can be used to manipulate visual feedback (VF) about movement, potentially influencing pain and movement. Objectives: A. To determine whether altered VF modulates pain during movement; B...
Article
Background and Objective Pain influences motor control. Previous reviews observed that pain reduces the excitability of corticospinal projections to muscles tested with transcranial magnetic stimulation. However, the independent effect of the type of pain models (tonic, phasic), pain location and tissues targeted (e.g. muscle, skin) remains unexplo...
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Background Low back pain (LBP) is the first cause of years lived with disability worldwide. This is due to the development of chronic pain. Thus, it is necessary to identify the best therapeutic approaches in the acute phase of LBP to limit the transition to chronic pain. Superficial heat presents the highest level of evidence for short-term reduct...
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Background: A popular outcome in rehabilitation studies is the activity intensity count, which is typically measured from commercially available accelerometers. However, the algorithms are not openly available, which impairs long-term follow-ups and restricts the potential to adapt the algorithms for pathological populations. The objectives of thi...
Preprint
Full-text available
Background The COVID-19 pandemic and the isolation measures taken to control it has caused important disruptions in economies and labour markets, changed the way we work and socialize, forced schools to close and healthcare and social services to reorganize in order to redirect resources on the pandemic response. This unprecedented crisis forces in...
Article
Background: The COVID-19 pandemic caused drastic changes in the lives of the general population. People with physical disabilities, who commonly encounter daily challenges such as barriers to community mobility, reduced access to healthcare services and higher risk of suffering from depression, may face additional challenges in the context of the p...
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Background: Neuropathic pain is a major problem following spinal cord injury (SCI). Central mechanisms involved in the modulation of nociceptive signals have been shown to be altered at the chronic stage, and it has been hypothesized that they might play a role in the development of chronic pain. Objective: This prospective longitudinal study ai...
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Physical interactions within virtual environments are often limited to visual information within a restricted workspace. A new system exploiting a cable-driven parallel robot to combine visual and haptic information related to environmental physical constraints (e.g. shelving, object weight) was developed. The aim of this study was to evaluate the...
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Movement is altered by pain, but the underlying mechanisms remain unclear. Assessing corrective muscle responses following mechanical perturbations can help clarify these underlying mechanisms, as these responses involve spinal (short-latency response, 20-50 ms), transcortical (long-latency response, 50-100 ms), and cortical (early voluntary respon...
Preprint
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Movement is altered by pain, but the underlying mechanisms remain unclear. Assessing corrective muscle responses following mechanical perturbations can help clarify these underlying mechanisms, as these responses involve spinal (short latency response), transcortical (long latency response) and cortical (early voluntary response) mechanisms. Pairin...
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Temporal predictability and intensity of an impending nociceptive input both shape pain experience and modulate laser-evoked potentials (LEPs) amplitude. However, it remains unclear whether and how these two factors could influence pain-induced corticospinal excitability modulation. The current study investigated the influence of nociceptive stimul...
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Individuals with pain report higher sensory disturbances during sensorimotor conflicts compared to pain-free individuals. In the pain field, it is frequently assumed that disturbances arise from a discordance between sensory and efference copies (defined as sensory-motor conflict), while in the sensorimotor control field they are considered to resu...
Article
Introduction À la suite d’une lésion médullaire incomplète (LMi), le contrôle de la marche est souvent affecté. Actuellement, les approches d’entraînements locomoteurs fréquemment utilisées sollicitent davantage les circuits automatiques (via des répétitions) et peu les circuits du contrôle volontaire de la marche (via des tâches de précision). Cep...
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Introduction: Proprioception is known to be affected after a spinal cord injury (SCI). However, it is currently assessed during simple tasks that do not reflect activities of daily living. To better understand how proprioception affects movement, assessing it during a functional sensorimotor task such as walking is therefore of primary importance....
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Motor learning and pain are important factors influencing rehabilitation. Despite being mostly studied independently from each other, important interactions exist between them in the context of spinal cord injury, whether to the spinal cord or the body. Ongoing or recent past episodes of nociceptive activity can prevent motor learning in spinalized...
Article
Background: Transcranial direct current stimulation (tDCS) is a promising tool for stroke rehabilitation. Yet, so far, results from the available clinical trials are inconclusive. Objectives: The primary objective of the present work was to test the efficacy of multiple sessions of tDCS combined with a highly standardized and progressive resista...
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Background: Workplace adaptation is the preferred method of intervention to diminish risk factors associated with the development of work-related shoulder disorders. However, the majority of the workplace assessments performed are subjective (e.g., questionnaires). Quantitative assessments are required to support workplace adaptations. The aims of...
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Motion capture systems are recognized as the gold standard for joint angle calculation. However, studies using these systems are restricted to laboratory settings for technical reasons, which may lead to findings that are not representative of real-life context. Recently developed commercial and home-made inertial measurement sensors (M/IMU) are po...
Article
Study design: Cross-sectional and longitudinal (exploratory) studies. Introduction: Rotator cuff (RC) tendinopathy is the most prevalent shoulder diagnosis, and proprioception deficits are often observed in individuals with RC tendinopathy. Purpose of the study: This study aimed to evaluate upper limb proprioception during a multijoint task in...
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Neuropathic pain represents a primary detrimental outcome of spinal cord injury. A major challenge facing effective management is a lack of surrogate measures to examine the physiology and anatomy of neuropathic pain. To this end, we investigated the relationship between psychophysical responses to tonic heat stimulation and neuropathic pain rating...
Data
Linear model statistics for the relationship between neuropathic pain intensity and tonic heat outcomes.
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There is a large body of evidence showing substantial sensorimotor reorganizations after an amputation. These reorganizations are believed to contribute to the development of phantom limb pain, but alternatively, pain might influence the plasticity triggered by the deafferentation. The aim of this study was to test whether pain impacts on deafferen...
Data
Mean normalized amplitude of each SSEP component of interest recorded from CP3 or CP4. S1A: N20 S1B: P25 S1C: P45 S1D: P90. (PDF)
Article
Background Sensorimotor conflicts are well‐known to induce sensory disturbances. However, explanations as to why patients with chronic pain are more sensitive to sensorimotor conflicts remain elusive. The main objectives of this study were 1) to assess and compare the sensory disturbances induced by sensorimotor conflict in complex regional pain sy...
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Full-text available
Sensorimotor conflict induces both sensory and motor disturbances, but the specific factors playing a role in conflict-induced disturbances are still misunderstood. For example, we still do not know the role played by motor intention (vs. a purely visuo-proprioceptive conflict) or the influence of specific types of incongruent visual feedback. The...
Article
Chronic pain is often accompanied by patient reported distorted body perception and an altered kinesthesia (referring to the senses of limb position and limb movement), but the association between these deficits is unknown. Objectives: 1- to assess body perception, and the senses of limb position and limb movement in Complex Regional Pain Syndrom...
Chapter
This paper presents a novel architecture of cable-driven parallel mechanism that yields large orientation capability around one axis. Design decisions and justifications are presented with the aim of producing a human-scale haptic interface used for the rehabilitation of patients in a fully immersive virtual environment. The rehabilitation task to...
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Introduction/Background Motion capture systems are extensively used to measure human joint kinematics. These systems, however, lack portability and can only be used in laboratory settings. Recently, portable and wireless systems, such as inertial measurement units (IMU), have been developed and are seen as an alternative to quantify human movement...
Article
Introduction/Background Proprioceptive deficits affect around 50% of stroke survivors. Most commonly used proprioception assessments have poor psychometric properties and are not adapted for people with multiple impairments. To address these limitations, we developed an assessment protocol that enables the quantification of elbow position sense wit...
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Key points: Experimental pain or its anticipation influence motor preparation processes as well as upcoming movement execution, but the underlying physiological mechanisms remain unknown. Our results showed that movement-related pain modulates corticospinal excitability during motor preparation. In accordance with the pain adaptation theory, corti...
Article
Study Design Triple-blind parallel-group randomized control trial. Background Anodal transcranial direct current stimulation (a-tDCS) has been shown to enhance the effects of sensorimotor training in neurological populations. For treatment of rotator cuff (RC) tendinopathy, sensorimotor training leads to reduce pain and increase function. Addition...
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Previous studies have shown that pain can interfere with motor control. The neural mechanisms underlying these effects remain largely unknown. At the upper limb, mounting evidence suggests that pain-induced reduction in corticospinal excitability is involved. No equivalent data is currently available at the lower limb. The present study therefore e...
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Background Understanding factors associated with high placebo responses in clinical trials increases the likelihood of detecting a meaningful treatment effect. The aim of the present study was to identify subject-level factors that contribute to placebo variability in patients with neuropathic pain due to spinal cord injury (SCI). Methods Multiple...