Papers by Camille Pouliquen
Scientific Reports
The ways in which locations of ischemia and ischemic pain affect spatiotemporal gait parameters a... more The ways in which locations of ischemia and ischemic pain affect spatiotemporal gait parameters and leg electromyographic activity during walking have never been investigated in patients with peripheral arterial disease presenting intermittent claudication. Two groups were classified according to unilateral location of ischemia (distal, n = 10, or proximo-distal, n = 12). Patients described pain and three gait phases—initial pain-free, onset of pain and maximum pain—were analyzed. Patients with proximo-distal ischemia walked less (230 ± 111 m vs 384 ± 220 m), with increased step length, step time (+ 5.4% and + 5.8%) and reduced cadence (− 8.2%), than patients with distal ischemia. In both, the peaks of vertical ground reaction force were reduced in maximum pain (Peak1-distal: − 11.4%, Peak1-proximo-distal: − 10.3%; Peak2-distal: − 11.8%, Peak2-proximo-distal: − 9.0%). In the proximo-distal group, tibialis anterior activation peak and time were lower than in the distal group (− 4.5% ...
Clinical Physiology and Functional Imaging
We seek to evaluate whether ischemia extent (unilateral or bilateral) impacts spatiotemporal and ... more We seek to evaluate whether ischemia extent (unilateral or bilateral) impacts spatiotemporal and neuromuscular gait parameters differently in patients with peripheral arterial disease and presenting intermittent claudication (PAD‐IC).
Le cycliste de haut niveau a comme objectif principal : gagner et optimiser sa performance. Une q... more Le cycliste de haut niveau a comme objectif principal : gagner et optimiser sa performance. Une question souvent soulevee par le sportif et son encadrement est le lien entre l’asymetrie, la performance et la sante. Dans ce contexte nous analysons dans un premier temps l’adaptation cinematique et musculaire de la jambe dominante chez le cycliste professionnel au cours du test incremental jusqu’a epuisement propose par la FFC. Les resultats ont montres que l’increment depuissance modifie la coordination musculaire avant d’impacter la cinematique articulaire. Ensuite nous proposons une nouvelle methodologie afin d’etudier l’evolution cinematique de l’asymetrie spatio-temporelle au cours de ce test. Les resultats ont permis de demontrer que le niveau d’asymetrie est plus important hors du plan sagittal, ce qui peut entrainer un risque de blessures, principalement au genou. Enfin, nous examinons l’influence de la fatigue sur le niveau d’asymetriearticulaire et musculaire par l’intermedia...
Frontiers in Sports and Active Living
This study aimed to quantify the influence of an increase in power output (PO) on joint kinematic... more This study aimed to quantify the influence of an increase in power output (PO) on joint kinematics and electromyographic (EMG) activity during an incremental test to exhaustion for a population of professional cyclists. The hip flexion/extension and internal/external rotation as well as knee abduction/adduction ranges of motion were significantly decreased at 100% of the maximal aerobic power (MAP). EMG analysis revealed a significant increase in the root mean square (RMS) for all muscles from 70% of the MAP. Gastrocnemius muscles [lateralis gastrocnemius (GasL) and medialis gastrocnemius (GasM)] were the less affected by the increase of PO. Cross-correlation method showed a significant increase in the lag angle values for VM in the last stage compared to the first stage, meaning that the onset of the activation started earlier during the pedaling cycle. Statistical Parametric Mapping (SPM) demonstrated that from 70% MAP, biceps femoris (BF), tibialis anterior (TA), gluteus maximus ...
BMC Nephrology
Background Chronic Kidney Disease (CKD) is associated with reduced muscular strength resulting in... more Background Chronic Kidney Disease (CKD) is associated with reduced muscular strength resulting in profound fatigue. The physiopathology of these changes, their prevalence and evolution are still debated. Moreover, we have little data on elderly CKD patients. The present study protocol aims to 1) quantify the prevalence of low muscle strength (dynapenia) in a cohort of elderly patients with advanced CKD and to 2) characterize their force production coupled with electromyographic features and the symptoms of fatigue compared to a matched control group. Methods This is a case-control, prospective, interventional study. Inclusion criteria: age ≥ 60 years; CKD Stage 3b-5; clinical stability (i.e. no hospitalization and ≤ 25% in creatinine increase in the previous 3 months). Controls with normal kidney function will be matched in terms of age, gender and diabetes mellitus (requisite: estimated glomerular filtration rate ≥ 60 ml/min/1.73m2 available in the last 6 months). Exclusion criteri...
Journal of Biomechanics
OBJECTIVE The aim of the study was to investigate the influence of age and/or obesity on postural... more OBJECTIVE The aim of the study was to investigate the influence of age and/or obesity on postural control, ankle muscle activities during balance testing and force production capacities. MATERIALS AND METHODS 4 groups; control group (CG; n = 25; age = 31.8 ± 7.5 years; BMI = 21.4 ± 2.5 kg/m2), obese group (OG; n = 25; age = 34.4 ± 9.5 years; BMI = 39.6 ± 5.4 kg/m2), elderly group (EG; n = 15; age = 77.1 ± 8.4 years; BMI = 24.4 ± 1.3 kg/m2) and obese elderly group (ObEG; n = 12; age = 78.6 ± 6.6 years; BMI = 34.5 ± 3.1 kg/m2) performed maximal voluntary contraction (MVC) before testing to calculate the maximal relative force of ankle plantar flexor (PF) and dorsal flexor (DF) muscles. Center of pressure (CoP) parameters and the electromyography (EMG) activity of PF and DF muscles were collected during MVC, quiet standing and limit of stability (LoS) testing along antero-posterior and medio-lateral axes. RESULTS Maximal relative force was higher in EG and ObEG than CG and OG, respectively (p < 0.001). CoP parameters, distance traveled along the antero-posterior axis and EMG activity of PF were higher in OG, EG and ObEG compared to CG (p < 0.001) and in EG compared to ObEG (p < 0.05).The EMG activity of PF was positively correlated with CoP parameters in OG and ObEG (r > 0.6; p < 0.05). Maximal relative force of PF (r > -0.6; p < 0.05) was negatively correlated with CoP parameters in ObEG and EG. CONCLUSION Obesity-related postural control alteration is associated with increased activity of PF. This neuromuscular adaptation may reflect deteriorations of the proprioceptive system and is likely additional to age-related muscular impairments. This may be a mechanism by which obesity increases postural control alterations in elderly.
Journal of sports sciences, Jan 30, 2018
This study investigated the influence of an incremental exercise on bilateral asymmetry through t... more This study investigated the influence of an incremental exercise on bilateral asymmetry through the spatio-temporal evolution of 3D joint angular displacement, using the Normalized Symmetry Index ([Formula: see text]) and cross-correlation methods. Twelve professional cyclists performed an incremental test to exhaustion, during which motion capture was used. Results revealed a decrease in range of motion between the first and last stages for twelve of the eighteen joint rotations, with the highest impact observed for right hip flexion/extension (61.8 ± 4.7° to 58.8 ± 4.1°, p < 0.05, ES = 0.68). For both stages, significant bilateral differences greater than 10° were observed for hip and knee flexion/extension (p < 0.05, ES>0.90) and ankle and hip internal/external rotation (p < 0.05, ES>0.25). Cross-correlation displayed the lowest pattern similarities for hip abduction/adduction and the highest similarities for knee flexion/extension, ankle plantarflexion/dorsiflexio...
The aim of this study was to use two asymmetry indexes from a kinematical point of view in profes... more The aim of this study was to use two asymmetry indexes from a kinematical point of view in professional cyclists during an incremental test to exhaustion. Twelve professional cyclists were evaluated during the French Cycling Federation’s protocol. Based on motion capture, asymmetry analysis was addressed by means of cross-correlation technique and a normalized symmetry index (NSI). Results pointed out that NSI could vary up to 18% throughout the pedaling cycle, with different behavior between upward and downward pedaling phases. Both methods exhibited low values of asymmetry especially for flexion/extension, but higher asymmetry values for other DOF. This study shows the complementarity of both NSI and cross-correlation methods. It enables to continuously evaluate changes during the crank cycle associated to skeletal movement.
Experimental Gerontology
OBJECTIVE The purposes of this study were to investigate the combined effects of age and obesity ... more OBJECTIVE The purposes of this study were to investigate the combined effects of age and obesity on gait and to analyze the relationship between age and obesity on ankle muscle activities during walking. MATERIALS AND METHODS 4 groups; the young non-obese control group (CG, n = 50, age = 31.8 ± 4.5 years; BMI = 21.4 ± 2.2 kg/m2), the young obese group (OB, n = 30, age = 35.4 ± 4.1 years; BMI = 38.6 ± 3.5 kg/m2), the non-obese older adults group (OA, n = 20, age = 76.1 ± 3.5 years; BMI = 24.4 ± 1.1 kg/m2) and the obese older adults group (OBOA, n = 20, age = 79.6 ± 5.7 years; BMI = 35.5 ± 2.7 kg/m2) walked on an instrumented gait analysis treadmill at their preferred walking speed. Spatiotemporal parameters, walking cycle phases, Vertical ground reaction force (GRFv) and center of pressure (CoP) velocity were sampled from the treadmill software. Electromyography (EMG) activity of the gastrocnemius medialis (GM), the soleus (SOL) and tibialis anterior (TA) were also collected during the walking test. A forward stepwise multiple regression analysis was performed to determine if body weight or age could predict ankle muscle activities during the different walking cycle phases. RESULTS Compared to OB, OBOA walked with higher CoP velocity, shorter stride, spending more time in support phase (p < .05). These manifestations were associated with higher TA and SOL activities during the 1st double support (1st DS) and higher TA activity during the single support (SS) (p < .05). Compared to OA, OBOA walked with lower GRFv, shorter and wider stride and spend more time in SU (p < .05). Moreover, SOL, TA and GM activities of OBOA were higher compared to OAG during 1st DS, SS and 2nd Double support (2nd DS), respectively (p < .05). During the 1ST DS, the stepwise multiple regression revealed that age accounted for 87% of the variance of TA activity. The addition of age contributed a further 16% to explain the variance TA activity. During the SS, age accounted for 64% and 46% of the variance of SOL and TA activity respectively. The addition of the body weight added further 15% and 66% of the variation of SOL and TA activity respectively. During the 2nd DS, body weight accounted for 86% of the variance and the addition of the body weight added a further 17% to explain the high level of GM. CONCLUSION Age in obese adults and obesity in older adults should be considered separately to evaluate neuromuscular responses during walking and, subsequently, optimize the modality of treatment and rehabilitation processes in obese individuals in order to reduce and/or prevent the risk of falls.
Uploads
Papers by Camille Pouliquen