References of "Croisier, Jean-Louis"
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See detailRelevance of adding a triangular dynamic cushion on a traditional chair: A 3D-analysis of seated schoolchildren
Fettweis, Tatiana ULiege; Onkelinx, Marie-Noëlle; Schwartz, Cédric ULiege et al

in Clinical Biomechanics (2017)

Background: Low back pain is highly prevalent in the general population and is even reported as early as at primary school. A poor sitting position has been suggested as an etiologic factor. This study ... [more ▼]

Background: Low back pain is highly prevalent in the general population and is even reported as early as at primary school. A poor sitting position has been suggested as an etiologic factor. This study analysed, in primary schoolchildren, the influence of a triangular dynamic cushion that aims to help children maintain their physiological lumbar lordosis and to induce movement to reduce the static effect of the sitting position. Methods: Thirty 8-year-old children took part in this study. A 3D analysis combined with electromyography was used to evaluate the biomechanics and the related muscle activation in two sitting positions (with and without a triangular cushion on a horizontal stool) during a 15-minute working task. In addition, the force of the feet on the ground was assessed with a force plate. Findings: The cushion improved the trunk–thighs angle, lumbar lordosis, anterior pelvis tilt, and feet support on the ground (p < 0.0001). In addition, sitting on the cushion appeared to be more dynamic (p < 0.05) and induced a decrease of the lumbar paravertebral muscle activity (p < 0.01). Interpretation: Sitting on a dynamic triangular cushion tends to favour the “ideal” siting position usually described in the literature and to decrease the level of paravertebral muscle recruitment. Seeing that sitting position is a risk factor to develop low back pain, the cushion could be a solution to prevent it. [less ▲]

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See detailPrevalence of sarcopenia in a population of nursing home residents according to their frailty status: results of the SENIOR cohort
Buckinx, Fanny ULiege; Reginster, Jean-Yves ULiege; BRUNOIS, Théo ULiege et al

in Journal of Musculoskeletal & Neuronal Interactions (2017), 17(3), 209-17

Objective: To investigate the relationship between frailty and sarcopenia, by evaluating the prevalence of sarcopenia among frail, pre-frail and robust elderly nursing home residents in Belgium. Methods ... [more ▼]

Objective: To investigate the relationship between frailty and sarcopenia, by evaluating the prevalence of sarcopenia among frail, pre-frail and robust elderly nursing home residents in Belgium. Methods: This is an analysis of baseline data collected from the SENIOR (Sample of Elderly Nursing home Individuals: an Observational Research) cohort. All subjects received a sarcopenia evaluation, based on the definition proposed by the European Working Group on Sarcopenia in Older People (EWGSOP). The frailty evaluation was primarily based on FRIED’s definition but also on 9 other operational definitions. Results: A total of 662 subjects (73.1% of women) were included in this analysis (mean age: 83.2±8.99 years). The prevalence of sarcopenia was 38.1% whereas the prevalence of frail and pre-frail persons was respectively 24.7% and 61.4%. Among frail, pre-frail and robust subjects, respectively 47%, 38.9% and 16.3% were diagnosed sarcopenic. The prevalence of sarcopenia according to ten different operational definitions of frailty ranged between 32.8 % (i.e. Frail scale Status and Frailty Index) and 47% (i.e. Fried definition). Conclusion: This research highlights that over a third of nursing home residents are sarcopenic and the percentage is almost 50% among frail subjects; those latter constitute about 1 in 4 of the population of nursing home residents studied here. [less ▲]

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See detailPrediction of the Incidence of Falls and Deaths Among Elderly Nursing Home Residents: The SENIOR Study.
Buckinx, Fanny ULiege; Croisier, Jean-Louis ULiege; Reginster, Jean-Yves ULiege et al

in Journal of the American Medical Directors Association (2017), (Online),

OBJECTIVE: The objective of this study was to evaluate, among nursing home residents, the extent to which the various operational definitions of frailty predict mortality and falls at 1 year. METHODS: We ... [more ▼]

OBJECTIVE: The objective of this study was to evaluate, among nursing home residents, the extent to which the various operational definitions of frailty predict mortality and falls at 1 year. METHODS: We studied 662 participants from the Sample of Elderly Nursing home Individuals: An Observational Research (SENIOR) cohort aged 83.2 ± 8.99 years, including 484 (72.5%) women and living in nursing homes. Among this cohort, 584 and 565 participants, respectively, were monitored over 12 months for mortality assessment and for occurrence of falls (ie, by mean of their medical records). Each patient was subjected to a clinical examination at baseline, during which many original clinical characteristics were collected. Stepwise regression analyses were carried out to predict mortality and falls. RESULTS: Among the participants included in the study, 93 (15.9%) died and 211 (37.3%) experienced a fall during the 1-year of follow-up. After adjustment, none of the definitions of frailty assessed predicted the 1-year occurrence of negative health outcomes. When comparing the clinical characteristics of deceased participants and those still alive, being a man (OR = 1.89; 95% CI: 1.19-3.01; P = .002) and being diagnosed with sarcopenia (OR = 1.7; 95% CI: 1.1-2.92; P = .03) were independent factors associated with 1-year mortality. Other independent factors that were significantly associated with the 1-year occurrence of falls were the results obtained with the Tinetti test (OR = 0.93; 95% CI: 0.87-0.98; P = .04), with the grip strength test (OR = 0.95; 95% CI: 0.90-0.98, P = .03), and with the isometric strength test of elbow extensors (OR = 0.93; 95%CI: 0.87-0.97; P = .04). CONCLUSIONS: Within the operational definitions of frailty assessed, none is sufficiently sensitive to predict the occurrence of falls and deaths at 1 year among nursing home residents. Globally, the frequency of undesirable health outcomes seems to be higher among participants with lower muscle strength and mobility. Medical strategy or adapted physical activity, with the aim of improving specific isometric muscle strength and mobility could potentially, but significantly, reduce the occurrence of falls and even deaths. [less ▲]

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See detailDeficits of ankle muscle strength not found in children, adolescents and young adults with haemophilic ankle arthropathy
Lobet, Sébastien; Croisier, Jean-Louis ULiege; Lantin, A.C. et al

in Haemophilia : The Official Journal of the World Federation of Hemophilia (2017)

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See detailReliability of muscle strength measures obtained with a hand-held dynamometer in an elderly population.
Buckinx, Fanny ULiege; Croisier, Jean-Louis ULiege; Reginster, Jean-Yves ULiege et al

in Clinical Physiology & Functional Imaging (2017), 37(3), 332-40

BACKGROUND: The objective of this study was to assess the reliability of a hand-held dynamometer for isometric strength measurements among nursing home residents. METHODS: The isometric muscle strength of ... [more ▼]

BACKGROUND: The objective of this study was to assess the reliability of a hand-held dynamometer for isometric strength measurements among nursing home residents. METHODS: The isometric muscle strength of nursing home residents was assessed for eight different muscle groups, using a hand-held dynamometer, the MicroFET2 device. Strength measurements were performed at baseline and after 4 days by the same operator and after 8 days by a second operator. Intraclass coefficients (ICC) were computed to assess the relative reliability, whereas the minimal detectable change (MDC%) was calculated to assess the absolute reliability of the test-retest of the MicroFET2 used by one single operator or by two different ones. RESULTS: Thirty nursing home residents (75.0 +/- 11.2 years, 50% of women) were enrolled in this study. ICC of the test-retest with one single operator ranged from 0.60 (0.37-0.83) for the ankle extensors to 0.85 (0.74-0.95) for the elbow flexors. When considering the test-retest with two different operators, the ICC values ranged from 0.62 (0.41-0.84) for the ankle extensors to 0.87 (0.79-0.96) for the elbow extensors. For the absolute reliability, MDC% varies from 27.64 (elbow flexors) to 81.97 (ankle extensors) when performed in intra-observer. In interobserver condition, MDC%, respectively, varies from 24.38 (elbow extensors) 67.59 (ankle extensors). CONCLUSION: Using standardized protocol and standardized instructions to patients, a high relative and moderate absolute reliability was observed for all but ankle muscle groups, making this hand-held dynamometer a potential tool for research in the elderly population. [less ▲]

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See detailAlgorithm for Temporal Gait Analysis Using Wireless Foot-Mounted Accelerometers
Boutaayamou, Mohamed ULiege; Denoël, Vincent ULiege; Bruls, Olivier ULiege et al

Book published by Springer (2017)

We present a new signal processing algorithm that extracts five gait events: heel strike, toe strike, heel-off, toe-off, and heel clearance from only two accelerometers attached on the heels of the ... [more ▼]

We present a new signal processing algorithm that extracts five gait events: heel strike, toe strike, heel-off, toe-off, and heel clearance from only two accelerometers attached on the heels of the subjects usual shoes. This algorithm first uses a continuous wavelet-based segmentation that parses the signal of consecutive strides into motionless periods defining relevant local acceleration signals. Then, the algorithm uses versatile techniques to accurately extract the five gait events from these local acceleration signals. We validated, on a stride-by-stride basis, the extraction of these gait events by comparing the results with reference data provided by a kinematic 3D analysis system and a video camera. The accuracy and precision achieved by the extraction algorithm for healthy subjects, the reduced number of accelerometer units required, and the validation results obtained, encourage us to further study this system in pathological conditions. [less ▲]

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See detailAvulsion fracture of the ischial tuberosity in a young sprinter: conservative or surgical treatment?
Tyberghein, Maëlle; Kaux, Jean-François ULiege; GODON, Bernard ULiege et al

in Abstract Book of Annual Congress of Physical & Rehabilitation Medicine 2016 (2016, December 09)

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See detailCross-cultural adaptation and validation of the Patient-Rated Tennis Elbow Evaluation (PRTEE) questionnaire on lateral elbow tendinopathy for French-speaking patients
Kaux, Jean-François ULiege; DELVAUX, François ULiege; SCHAUS, Jean ULiege et al

in Journal of Hand Therapy (2016), 29(4), 496-504

Background: The lateral elbow tendinopathy is a common injury in tennis players and physical workers. The Patient-Rated Tennis Elbow Evaluation (PRTEE) questionnaire was specifically designed to measure ... [more ▼]

Background: The lateral elbow tendinopathy is a common injury in tennis players and physical workers. The Patient-Rated Tennis Elbow Evaluation (PRTEE) questionnaire was specifically designed to measure pain and functional limitations in patients with lateral epicondylitis (tennis elbow). First developed in English, this questionnaire has since been translated into several languages. Objectives: The aims of the study were to translate and cross-culturally adapt the PRTEE questionnaire into French and to evaluate the reliability and validity of this translated version of the questionnaire (PRTEE-F). Methods: The PRTEE was translated and cross-culturally adapted into French according to international guidelines. To assess the reliability and validity of the PRTEE-F, 115 participants were asked twice to fill in the PRTEE-F, and once the Disabilities of Arm, Shoulder and Hand questionnaire (DASH) and the Short Form Health Survey (SF-36). Internal consistency (using Cronbach’s alpha), test-retest reliability (using intra-class correlation coefficient (ICC), Standard Error of Measurement (SEM) and Minimal Detectable Change (MDC)), and convergent and divergent validity (using the Spearman’s correlation coefficients respectively with the DASH and with some sub scales of the SF-36) were assessed. Results: The PRTEE was translated into French without any problems. PRTEE-F showed a good test-retest reliability for the overall score (ICC 0.86) and for each item (ICC 0.8-0.96) and a high internal consistency (Cronbach’s alpha = 0.98). The correlation analyses revealed high correlation coefficients between PRTEE-F and DASH (convergent validity) and, as expected, a low or moderate correlation with the divergent subscales of the SF-36 (discriminant validity). There was no floor or ceiling effect. Conclusions: The PRTEE questionnaire was successfully cross-culturally adapted into French. The PRTEE-F is reliable and valid for evaluating French-speaking patients with lateral elbow tendinopathy. [less ▲]

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See detailValidity and reliability of the French translation of the VISA-A questionnaire for Achilles tendinopathy
Kaux, Jean-François ULiege; Delvaux, François ULiege; Oppong-Kyei, Julian et al

in Disability & Rehabilitation (2016), 38(26), 2593-2599

Purpose The Victorian Institute of Sport Assessment – Achilles tendinopathy questionnaire (VISA-A) evaluates the clinical severity of Achilles tendinopathy. The aim of this study was to translate the VISA ... [more ▼]

Purpose The Victorian Institute of Sport Assessment – Achilles tendinopathy questionnaire (VISA-A) evaluates the clinical severity of Achilles tendinopathy. The aim of this study was to translate the VISA-A into French and to study the reliability and validity of this French version, the VISA-AF. Method The VISA-A was translated into French to produce the VISA-AF using a validated methodology in six steps. Thereafter, several psychometric properties of this French version such as test–retest reliability, internal consistency, construct validity and floor and ceiling effects were evaluated. Therefore, we recruited 116 subjects, distributed into 3 groups: pathological patients (n¼31), at-risk athletes (n¼63) and healthy people (n¼22). Results The final version of the VISAAF was approved by an expert committee. On a scale ranging from 0 to 100, the average scores of the VISA-AF obtained were 59 (± 18) for the pathological group, 99 (± 1) for the healthy group and 94 (± 7) for the at-risk group. The VISA-AF shows excellent reliability, low correlations with the discriminant subscales of the SF-36 and moderate correlations with the convergent subscales of the SF-36. Conclusions The French version of the VISA-A is equivalent to its original version and is a reliable and valid questionnaire for French-speaking patients with Achilles tendinopathy. [less ▲]

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See detailCaractéristiques et évolution de la force après rééducation de la rupture de coiffe des rotateurs
Forthomme, Bénédicte ULiege; Schwartz, Cédric ULiege; MAHIEU, Xavier ULiege et al

in Abstract Book des XVIIIèmes RENCONTRES ISOCINETIQUES MEDIMEX / ROTSCHILD (2016, November)

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See detailRécupération musculaire après plastie LCA : conséquences sur le retour au sport
Croisier, Jean-Louis ULiege; Delvaux, François ULiege; Kaux, Jean-François ULiege et al

in Abstract Book des XVIIIèmes RENCONTRES ISOCINETIQUES MEDIMEX / ROTSCHILD (2016, November)

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See detailLa pubalgie - Rééducation post-chirurgicale
Delvaux, François ULiege; DANIEL, Christophe ULiege; NAMUROIS, Marie-Hélène ULiege et al

Conference (2016, October 22)

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See detailAdaptation interculturelles du questionnaire "Patient-Rated Tennis Elbow Evaluation" pour les patients francophones
Kaux, Jean-François ULiege; DELVAUX, François ULiege; SCHAUS, Jean ULiege et al

in 9ème Congrès commun SFMES - SFTS (2016, September)

Contexte: L’épicondylite latérale est une blessure commune chez les joueurs de tennis et les travailleurs physiques pour qui il existe un questionnaire en anglais qui en évalue la sévérité. Le ... [more ▼]

Contexte: L’épicondylite latérale est une blessure commune chez les joueurs de tennis et les travailleurs physiques pour qui il existe un questionnaire en anglais qui en évalue la sévérité. Le questionnaire « Patient-Rated Tennis Elbow Evaluation » (PRTEE) mesure la douleur et l’incapacité fonctionnelle du coude chez les patients souffrant d’une épicondylite latérale. Le questionnaire a déjà été traduit en suédois, en turc, en québécois, en italien, en néerlandais et en grec. Objectifs : Le but de cette étude est de traduire et de réaliser une adaptation interculturelle du questionnaire PRTEE en français et d’en évaluer sa fiabilité et sa validité. Matériel et Méthodes : Le PRTEE a été adapté interculturellement en français selon les lignes directrices internationales. Les participants (n=115) ont rempli le PRTEE-F, deux fois avec un intervalle de 30 minutes, le questionnaire Disabilities of Arm, Soulier and Hand (DASH), et le Short Form Health Survey (SF-36) pour évaluer la fiabilité et la validité du PRTEE-F. La cohérence interne (avec l’alpha de Cronbach), la fidélité test-retest (avec la corrélation intra-classe (ICC)) et la validité de construit (avec le coefficient de corrélation de Spearman). Résultats : Le PRTEE-F montre une fidélité test-retest bonne pour le score total (ICC 0,83) et pour les différents items (ICC 0,71-0,9). La traduction française possède une cohérence interne élevée (0,98). La corrélation entre le PRTEE-F et le DASH est forte pour le score total (rs=0,92, p<0.001), pour le sous-total symptomatique (rs=0,86, p<0.001) et fonctionnel (rs=0,93, p<0.001). Le PRTEE-F possède une corrélation forte avec une partie des sous-échelles convergentes du SF-36 (PF, RP et BP). Il y a une corrélation faible ou modérée avec les sous-échelles divergentes du SF-36 (REm, MH, SF et VT). Il n’y a pas d’effet plancher et plafond. Conclusion : La version française du questionnaire PRTEE a été adaptée interculturellement avec succès, et cette étude a montré que le PRTEE-F est fiable et valide pour évaluer les patients francophones souffrant d’une épicondylite latérale. [less ▲]

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See detailImpact d’une réathlétisation précoce sur les performances des sportifs opérés d’une rupture du ligament croisé antéro-externe du genou
Duval, Thomas; Kaux, Jean-François ULiege; LEHANCE, Cédric ULiege et al

in 9ème Congrès commun SFMES - SFTS (2016, September)

Introduction : La reconstruction du ligament croisé antéro-externe du genou est une chirurgie lourde qui est suivie d’une longue période de rééducation. Le retour au sport après cette opération reste ... [more ▼]

Introduction : La reconstruction du ligament croisé antéro-externe du genou est une chirurgie lourde qui est suivie d’une longue période de rééducation. Le retour au sport après cette opération reste toutefois un défi. Plus d’un tiers des athlètes est incapable de reprendre son activité au même niveau. La peur de subir un nouvel accident reste un obstacle majeur à cette reprise sportive et la persistance de déficits fonctionnels est la première cause de récidives de déchirure ligamentaire. Matériels et méthodes : Notre échantillon comprend dix sujets, cinq dans le groupe bénéficiant d’une réathlétisation précoce et cinq dans le groupe témoin. Le premier groupe réalise une séance de réathlétisation précoce hebdomadaire (à raison d’une fois par semaine et ce, durant six mois) associée à la rééducation en kinésithérapie durant une durée de six mois. Le deuxième groupe bénéficie uniquement de séances de kinésithérapie classique respectant un protocole bien défini du CHU de Liège. Nous avons choisi de réaliser, en pré-opératoire, dans les deux groupes, un test isocinétique. En post-opératoire (après six mois), les sujets des deux groupes ont réalisé dans l’ordre suivant : un test isocinétique, un questionnaire de KOOS et enfin des tests fonctionnels (Hop test). Les séances de réathlétisation et de kinésithérapie sont suivies selon un protocole spécifique respectant l’individualisation propre à chaque patient. Résultats : L’analyse des tests isocinétiques et du questionnaire de KOOS, nous a permis de constater des différences entre les deux groupes au niveau des valeurs chiffrées mais qui ne sont cependant pas significatives (P level= 0,07). Par contre, l’analyse des résultats obtenus dans les tests fonctionnels (tests de sauts en longueur évaluant la performance en distance) a montré des différences significatives (P level= 0,04 pour le single hop et le triple hop test, P level= 0,02 pour le cross over hop test) entre les deux groupes et celles-ci sont au bénéfice du groupe ayant bénéficié d’une réathlétisation précoce. Conclusion : Dans cette étude, nous constatons une amélioration globale des performances en faveur du groupe ayant bénéficié d’une réathlétisation précoce. Cependant lors de l’analyse statistique et ce surtout concernant dans le test isocinétique, peu d’éléments évoluent de manière significative voir aucun pour le questionnaire de KOOS. Le faible échantillonnage de cette étude préliminaire intervient certainement dans ce constat. [less ▲]

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See detailTraduction inter-culturelle et validation du Kujala Anterior Knee Pain Scale (AKPS) en français
Kaux, Jean-François ULiege; Bornheim, Stephen ULiege; Remy, Gaël et al

in 9ème Congrès commun SFMES - SFTS (2016, September)

Introduction : Le syndrome fémoro-patellaire est l'un des problèmes de genou les plus répandus qui se caractérise par une douleur antérieure du genou dans des activités mettant en charge l'articulation ... [more ▼]

Introduction : Le syndrome fémoro-patellaire est l'un des problèmes de genou les plus répandus qui se caractérise par une douleur antérieure du genou dans des activités mettant en charge l'articulation fémoro-patellaire. Le Kuala Anterior Knee Pain Scale (Kujala AKPS) est un questionnaire utilisé pour évaluer les symptômes subjectifs, tels que les limitations fonctionnelles et la douleur antérieure du genou. Le questionnaire a déjà été traduit et validé en portugais brésilien, en persan, en chinois, en turque, et en néerlandais. Le but de cette étude est de traduire ce questionnaire en français afin d'en évaluer sa fiabilité et sa validité. Matériel et méthode : La traduction et l’adaptation interculturelle du questionnaire a été adaptée selon les recommandations internationales qui se présentent en 6 étapes : traduction initiale, synthèse des traductions, traduction de retour vers la langue d’origine, comité d'experts, test de la version pré-finale et approbation du comité experts. Une fois la version française obtenue, les participants (n=101) ont remplis 2 fois le Kujula AKPS avec un intervalle de 7 jours, et le Short Form Health Survey (SF-36) afin d'en évaluer les propriétés psychométriques (la cohérence interne, la fidélité test-retest et la validité de construit). Résultats : Le Kujula AKPS montre une fidélité test-retest élevée pour le score total (ICC 0,97). La traduction française possède une cohérence interne élevée (0,87). Le Kujula AKPS possède une corrélation forte avec une partie des sous-échelles convergentes du SF-36 (PF, RP et BP). Il y a une corrélation faible ou modérée avec les sous-échelles divergentes du SF-36 (MH, SF et VT). Il n’y a pas d’effet plancher et plafond. Conclusion : La version française du questionnaire Kujula AKPS étant compréhensible, semble avoir une bonne adaptation interculturelle. Cette étude a démontré que le Kujula AKPS-F est fiable et valide pour les patients francophones souffrant d'un syndrome rotulien. [less ▲]

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See detailThe cardiovascular impact of intense eccentric isokinetic exercise versus aerobic treadmill running
LE GOFF, Caroline ULiege; Kaux, Jean-François ULiege; LAURENT, Terry ULiege et al

in Isokinetics & Exercise Science (2016), 24(3), 201-208

BACKGROUND: Regular physical activity is an important health factor, but intense physical stress can increase the risk of heart disease. OBJECTIVE: Our aim was to determine the potential cardiac ... [more ▼]

BACKGROUND: Regular physical activity is an important health factor, but intense physical stress can increase the risk of heart disease. OBJECTIVE: Our aim was to determine the potential cardiac repercussions of, and the oxidative stress resulting from a maximal eccentric isokinetic exercise and a 1-hour treadmill run at 75% ˙V O2 max (maximal exercise done 6 weeks before). METHODS: Twelve young sedentary healthy subjects randomly performed two tests separated by 6 weeks: 1) 3 sets of 30 maximal eccentric isokinetic contractions of the quadriceps; 2) a 1-hour running on treadmill at 75% ˙V O2 max. We drew blood samples just before each exercise (T1), and just after (T2), 3 hours after (T3), and 24 hours after (T4) the end of each exercise to measure cardiac and oxidative stress biomarkers. RESULTS: In the running group, we observed significant differences for myoglobin (T3: 145 ± 80 μg/L), creatinine kinase (T4: 593 ± 350 mg/L), oxidized glutathione (T2: 22 ± 15.6 μmol/L), and highly sensitive cardiac troponin T, (T3: 0.051 ± 0.038 ng/mL). In the isokinetic group, we observed significant differences for myoglobin (T3:1419 ± 2533 mg/L), creatine kinase (3303 ± 7159 mg/L), and oxidized glutathione (T4:24 ± 14 μmol/L). Between isokinetic exercise and running, we observed significant differences for uric acid (p < 0.05, running > eccentric), myoglobin (p < 0.05, ditto), NT-proBNP (p < 0.05, ditto), hsTnT (p < 0.01, ditto), and oxidized glutathione (p < 0.05). CONCLUSIONS: As cardiac biomarkers appear practically unmodified after the isokinetic exercise, despite the considerable oxidative stress, we suggest that the application of intense maximal eccentric isokinetic exercise, when indicated, should be safe for most patients including those whose cardiac status is unknown. On the other hand, the increase in cardiac biomarkers observed after running, could reflect leakage of these biomarkers from the cytosolic pool of cardiac cells, linked to membrane damage, rather than the result of a major injury and hence running is supposed to be a safe practice. However, since sudden death during running has been previously described, assesment of the cardiac biomarkers and a follow-up by a sport doctor is important especially if there is a cardiac family history. [less ▲]

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See detailGait pattern of healthy old people for fast walking condition
GILLAIN, Sophie ULiege; Boutaayamou, Mohamed ULiege; Schwartz, Cédric ULiege et al

in Gerontechnology (2016, September)

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See detailGait pattern of healthy old people for dual task walking condition
GILLAIN, Sophie ULiege; Boutaayamou, Mohamed ULiege; Schwartz, Cédric ULiege et al

in Gerontechnology (2016, September)

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See detailReproducibility of a tennis serve protocol
Tubez, François ULiege; FORTHOMME, Bénédicte ULiege; Croisier, Jean-Louis ULiege et al

Conference (2016, July 08)

INTRODUCTION Serve in modern tennis game is a real offensive weapon for players. In kinematic analysis, it is the most studied stroke of this game because it is the only stroke played in a closed skill ... [more ▼]

INTRODUCTION Serve in modern tennis game is a real offensive weapon for players. In kinematic analysis, it is the most studied stroke of this game because it is the only stroke played in a closed skill. Players have a maximum of control on this stroke. It is unclear whether 3D kinematic tests are reproducible for the same player under identical conditions and if a familiarization session is necessary. In practice, with professional players, who have little time available to perform tests, familiarization sessions are difficult. The aim of our study is to measure the reproducibility of a 3D serve protocol test. METHODS Nine tennis players (righties, regional level, 20 ± 2 years) were asked to hit first flat serves in a 1 m² area placed on the "T" zone of deuce diagonal of the tennis court. Two identical tests are performed one week apart. For each test, we selected the three best serves of the 25 trials (with the highest speed and the highest accuracy). Kinetics measurements were performed using a 3D analysis system (Codamotion), a force platform (Kistler) and a radar gun. 28 markers were placed on the players’ bodies to measure kinematics of the movements: ankles, knees, hips, trunk, shoulder, elbow and wrist dominant side. We measured ball speed, leg drive, linear velocity of the racket and joints, joints range of motion and maximum angular velocities at different positions (armed, maximum external rotation and impact) (1). RESULTS All analyzed parameters (linear speeds of racket and joints, leg drive force, joint angles and angular velocities) are reproducible with exception of a small part of them. Our study shows that 5,7% (7 of 122 measurements) joint position parameters and 8,3% (4 of 48 measures) angular velocity parameters are not reproducible from a session to another. DISCUSSION Various errors sources encountered in 3D analysis can justify the presence of non-reproducible parameters (2-3). However, after this work, we can state that the established protocol provides reproducible results when analyzing the tennis serve. [less ▲]

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