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See detailMuscle energetics in fibromyalgia patients explored by magnetic resonance imaging and 31P-spectroscopy
Maquet, Didier ULg; Vanderthommen, Marc ULg; Demoulin, Christophe ULg et al

in Pederson, John-A. (Ed.) New Research in Fibromyalgia (2006)

Objectives: The aim of this study was to use magnetic resonance imaging and 31P spectroscopy in order to explore muscle metabolism during exercise in fibromyalgia patients. Methods: Eight women with ... [more ▼]

Objectives: The aim of this study was to use magnetic resonance imaging and 31P spectroscopy in order to explore muscle metabolism during exercise in fibromyalgia patients. Methods: Eight women with fibromyalgia (FM) and 30 healthy volunteers were included in this study. Magnetic resonance imaging of the dominant leg was acquired in order to determine the maximal transverse section (MTS) of calf muscles and thus to calculate the different loads of exercise (dynamic plantar flexions). Subjects performed 3-6 bouts of 2 minutes with workload increments until exhaustion. Spectra were acquired continuously at rest, during the exercise and recovery periods. The analysis concerned the -, - and - ATP, Pi, PCr peaks, and intracellular pH. At the end of the exercise, a muscular efficacy index and the PCr re-phosphorylation time constant were calculated. Results: The MTS of the ankle plantar flexors reached respectively 43  7 cm² and 36.7  5 cm² in control and FM groups (p > 0.05). No significant difference (p > 0.05) was observed between both groups in spectroscopic data registered at rest [10.7 (control) vs 9.1 (FM) for PCr/Pirest ; 7.01 (control) vs 6.99 (FM) for pHrest] and at the end of exercise [1.18 (control) vs 0.68 (FM) for PCr/Piend ; 6.89 (control) vs 6.81 (FM) for pHend]. The muscular efficacy index was significantly reduced in FM patients (1.25) in comparison with control group (2.46) (p < 0.05). The PCr time constant was not different between control subjects (27.7 s) and FM patients (25.6 s) (p > 0.05). Conclusions: This study did not indicate any abnormalities in glycolytic and oxydative pathways in FM patients. We demonstrated a low efficiency of chemical to mechanical energy shift in FM patients. These results suggested a deconditioning syndrome without primitive muscular abnormalities in FM patients and displayed the importance of aerobic muscular rehabilitation. [less ▲]

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See detailMuscle fatigue experienced during maximal eccentric exercise is predictive of the plasma creatine kinase (CK) response
Hody, Stéphanie ULg; Rogister, Bernard ULg; Leprince, Pierre ULg et al

in Scandinavian Journal of Medicine & Science in Sports (2013), 23(4), 501-7

Unaccustomed eccentric exercise may cause skeletal muscle damage with an increase in plasma creatine kinase (CK) activity. Although the wide variability among individuals in CK response to standardized ... [more ▼]

Unaccustomed eccentric exercise may cause skeletal muscle damage with an increase in plasma creatine kinase (CK) activity. Although the wide variability among individuals in CK response to standardized lengthening contractions has been well described, the reasons underlying this phenomenon have not yet been understood. Therefore, this study investigated a possible correlation of the changes in muscle damage indirect markers after an eccentric exercise with the decline in muscle performance during the exercise. Twenty-seven healthy untrained male subjects performed three sets of 30 maximal isokinetic eccentric contractions of the knee extensors. The muscular work was recorded using an isokinetic dynamometer to assess muscle fatigue by means of various fatigue indices. Plasma CK activity, muscle soreness, and stiffness were measured before (pre) and one day after (post) exercise. The eccentric exercise bout induced significant changes of the three muscle damage indirect markers. Large intersubject variability was observed for all criteria measured. More interestingly, the log (CKpost/CKpre) and muscle stiffness appeared to be closely correlated with the relative work decrease (r = 0.84, r2 = 0.70 and r = 0.75, r2 = 0.56, respectively). This is the first study to propose that the muscle fatigue profile during maximal eccentric protocol could predict the magnitude of the symptoms associated with muscle damage in humans. [less ▲]

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See detailMuscle fatigue experienced during maximal eccentric exercise is predictive of the plasma creatine kinase (CK) response
Hody, Stéphanie ULg; Rogister, Bernard ULg; Leprince, Pierre ULg et al

in Meeusen, R.; Duchateau, J.; Roelands, B. (Eds.) et al Book of Abstracts of the 17th annual Congress of the ECSS (2012, July)

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See detailMuscle Fibre Type and Size, and Muscle Capillary Density in Young Double-Muscled Blue Belgian Cattle
Stavaux, D.; Art, Tatiana ULg; Mc Entee, Kathleen ULg et al

in Zentralblatt für Veterinarmedizin. Reihe A (1994), 41(3), 229-236

Bovine muscle biopsies were analysed for fiber type and capillary density by the acid ATP-ase and amylase-PAS methods respectively. Samples obtained from Belgian blue double muscled (DM) calves were ... [more ▼]

Bovine muscle biopsies were analysed for fiber type and capillary density by the acid ATP-ase and amylase-PAS methods respectively. Samples obtained from Belgian blue double muscled (DM) calves were compared for their fibre type, size and vascularization with samples from Friesian (F) calves. The animals were sampled both at 2 and 7 months of age. Changes in histochemical composition occurring with ageing, independently of the breed, and differences related to the muscle sampled by comparing biopsies obtained from the longissimus dorsi (LD) and gluteobiceps (GB) muscles in animals of both breed were also investigated. Independently of age and muscle, fibre type I percentage and area were significantly higher in F than in DM muscles. Type IIa area was significantly larger in F than in DM, while fibre type IIb percentage and area were higher in DM. The number of capillaries/mm2 was significantly higher in F than in DM. Fibre type IIa and IIb percentage as well as the diameter of the three fibre types was significantly higher in the oldest animals. Finally, independently of age and breed, fibre type I and IIb percentages were significantly higher in LD but lower in GB. The results mainly demonstrated that Belgian blue DM muscles present a higher proportion of IIb fibres and a lower capillary supply than F muscles. [less ▲]

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See detailMuscle mitochondrial respiratory function in healthy and myopathic horses
Votion, Dominique ULg; Serteyn, Didier ULg

in In Proceedings (CD-ROM): Mitochondrial Medicine 2009: Capitol Hill Symposium (2009, June)

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See detailMuscle performance in patients with fibromyalgia
Maquet, Didier ULg; Croisier, Jean-Louis ULg; Renard, Cindy ULg et al

in Joint Bone Spine (2002), 69(3), 293-299

Objectives. To compare muscle performance in women with fibromyalgia and in healthy women. Patients and methods. Sixteen women with fibromyalgia syndrome (FMS) and 85 healthy women who were physically ... [more ▼]

Objectives. To compare muscle performance in women with fibromyalgia and in healthy women. Patients and methods. Sixteen women with fibromyalgia syndrome (FMS) and 85 healthy women who were physically inactive or engaged in recreational sports underwent measurements of four parameters: maximal concentric isokinetic muscle strength of the knee extensors and flexors in the dominant limb, isometric grip strength on a Colin dynamometer, muscle fatigue resistance during 30 maximal concentric isokinetic contractions of the dominant knee flexors and extensors at 180° angular velocity, and static endurance during posture maintenance. Results. All muscle variables were decreased in the FMS patients as compared to the controls.The decreases were more marked during aerobic than during anaerobic exercise.Mean decreases were 39% (P<0.001) for muscle strength, 40% (P<0.0001) for fatigue resistance, and 81% (P<0.0001) for static endurance. Pain during exercise as evaluated using a visual analog scale was more marked in the FMS patients. Conclusion. This study of the three pathways supplying energy to muscle confirms that muscle function is globally impaired in FMS patients.The results suggest that the impairment predominates on aerobic processes. [less ▲]

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See detailMuscle protein metabolism in relation to growth rate in double muscled Belgian Blue bulls: an integrated approach
Van Eenaeme, Christian ULg; Hornick, Jean-Luc ULg; Baldwin, Paule et al

in Mededelingen van de Faculteit van Landbouwwetenschappen, Rijksuniversiteit, Gent (1996), 61/4a

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See detailMuscle protein turnover in double muscled Belgian Blue bulls during reduced and subsequent adequate energy and protein intake
Van Eenaeme, Christian ULg; Hornick, Jean-Luc ULg; Gauthier, Sabine et al

in Symposium Lavoisier. Metabolic fuel selection (1994)

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See detailMuscle relaxants in neurosurgical anaesthesia: a critical appraisal.
Hans, Pol ULg; Bonhomme, Vincent ULg

in European Journal of Anaesthesiology (2003), 20(8), 600-5

The use of muscle relaxants, considered until recently as common practice in current neurosurgical anaesthesia protocols, becomes increasingly more questionable today. The reasons rely on the evolution of ... [more ▼]

The use of muscle relaxants, considered until recently as common practice in current neurosurgical anaesthesia protocols, becomes increasingly more questionable today. The reasons rely on the evolution of neurosurgery including the advent of new surgical techniques, the evolution of anaesthesia having the benefit of new drugs and devices, and the rationale for using muscle relaxants balanced against their potential side-effects and possible pharmacodynamic alterations in neurosurgical patients. [less ▲]

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See detailMuscle strength assessment after ACL reconstruction: Influence of the isokinetic testing modalities
Croisier, Jean-Louis ULg; Forthomme, Bénédicte ULg; Crielaard, Jean-Michel ULg et al

in Journal of Rehabilitation Medicine Supplement (2008), 47

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See detailMuscle: a source of progenitor cells for bone fracture healing.
Henrotin, Yves ULg

in BMC Medicine (2011), 9

Bone repair failure is a major complication of open fracture, leading to non-union of broken bone extremities and movement at the fracture site. This results in a serious disability for patients. The role ... [more ▼]

Bone repair failure is a major complication of open fracture, leading to non-union of broken bone extremities and movement at the fracture site. This results in a serious disability for patients. The role played by the periosteum and bone marrow progenitors in bone repair is now well documented. In contrast, limited information is available on the role played by myogenic progenitor cells in bone repair. In a recent article published in BMC Musculoskeletal Disorders, Liu et al. compared the presence of myogenic progenitor (MyoD lineage cells) in closed and open fractures. They showed that myogenic progenitors are present in open, but not closed fractures, suggesting that muscle satellite cells may colonize the fracture site in the absence of intact periosteum. Interestingly, these progenitors sequentially expressed a chondrogenic and, thereafter, an osteoblastic phenotype, suggestive of a functional role in the repair process. This finding opens up new perspectives for the research of orthopedic surgical methods, which could maximize myogenic progenitor access and mobilization to augment bone repair. Please see related article: http://www.biomedcentral.com/1471-2474/12/288. [less ▲]

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See detailMuscles fléchisseurs et extenseurs de cheville en isocinétisme : méthodologie et contexte pathologique
Croisier, Jean-Louis ULg; Sutera, T.; Kaux, Jean-François ULg et al

in Abstract book des XIIIèmes Rencontres isocinétiques MEDIMEX/ROTHSCHILD (2011, November 25)

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See detailMuscles rotateurs d'épaule et isocinétisme
Croisier, Jean-Louis ULg; Mommer, R.; Crielaard, Jean-Michel ULg

in Médecine et Hygiène (1993), 51

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See detailMuscular and physical features correlated with ball velocity during the volleyball spike
Forthomme, Bénédicte ULg; Croisier, Jean-Louis ULg; Ciccarone, Guido et al

in Computer Methods in Biomechanics & Biomedical Engineering (2005, September), 8(Supp 1), 105-106

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See detailMuscular imbalance and acute lower extremity muscle injuries in sport
Croisier, Jean-Louis ULg

in International SportMed Journal (2004), 5(3), 169-176

Investigating factors associated with muscle strains highlight the multifactorial origin of the injury and the difficulty of identifying isolated or combined factors that caused the injury. Among the ... [more ▼]

Investigating factors associated with muscle strains highlight the multifactorial origin of the injury and the difficulty of identifying isolated or combined factors that caused the injury. Among the numerous causes reported in the literature, only a few have been scientifically associated with injury occurrence, while others have been empirically suggested. Contradictions in articles dealing with muscle strength and imbalance are frequent, and are probably the result of differences in methodology and criteria for patient inclusion. Imbalance in muscle strength commonly refers to abnormal bilateral asymmetry (between homologous groups) and a disruption of the agonist-antagonist ratio. Some authors who focus on a history of hamstring or adductor strains have demonstrated the frequent abnormality of muscle strength and balance by means of isokinetic assessment. Mixed ratios, combining the eccentric performance of “decelerating” muscles (such as the hamstrings) and the concentric performance of “mobiliser” muscles (such as the quadriceps) are suggested and seem relevant. An increased emphasis on eccentric strengthening exercises, particularly for the hamstrings, and ratio correction on the basis of statistically selected cut-offs, significantly reduces the recurrence rate of the injury and lingering complaints upon return-to-sport. Similarly, isokinetic interventions, as a preseason screening tool in sports where there is a high rate of muscle strain injuries, could detect imbalances early and thus promote a preventive strategy. [less ▲]

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See detailMuscular imbalances determined by isokinetic and functional tests in professional basketball players
Schiltz, Marc; Lehance, Cédric ULg; Maquet, Didier ULg et al

in Abstract book de la 6ème Journée Belge d’Isocinétisme du GIBL (2008, March)

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See detailMuscular Performance Assessment of Trunk Extensors: A Critical Appraisal of the Literature
Demoulin, Christophe ULg; GROSDENT, Stéphanie ULg; Smeets, Rob et al

in Asghar Norasteh, Ali (Ed.) Low Back Pain (2012)

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See detailMuscular strength and functional performances in elite and junior elite soccer players: what does preseason testing really teach us?
Lehance, Cédric ULg; Binet, Johnny; Bury, Thierry ULg et al

in Journal of Sports Science & Medicine (2007), 6(suppl 10), 68-69

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See detailMuscular strength, functional performances and injury risk in professional and junior elite soccer players.
Lehance, Cédric ULg; Binet, J.; Bury, Thierry ULg et al

in Scandinavian Journal of Medicine & Science in Sports (2009), 19(2), 243-51

Muscle strength and anaerobic power of the lower extremities are neuromuscular variables that influence performance in many sports activities, including soccer. Despite frequent contradictions in the ... [more ▼]

Muscle strength and anaerobic power of the lower extremities are neuromuscular variables that influence performance in many sports activities, including soccer. Despite frequent contradictions in the literature, it may be assumed that muscle strength and balance play a key role in targeted acute muscle injuries. The purpose of the present study was to provide and compare pre-season muscular strength and power profiles in professional and junior elite soccer players throughout the developmental years of 15-21. One original aspect of our study was that isokinetic data were considered alongside the past history of injury in these players. Fifty-seven elite and junior elite male soccer players were assigned to three groups: PRO, n=19; U-21, n=20 and U-17, n=18. Players benefited from knee flexor and extensor isokinetic testing consisting of concentric and eccentric exercises. A context of lingering muscle disorder was defined using statistically selected cut-offs. Functional performance was evaluated throughout a squat jump and 10 m sprint. The PRO group ran faster and jumped higher than the U-17 group (P<0.05). No significant difference in isokinetic muscle strength performance was observed between the three groups when considering normalized body mass parameters. Individual isokinetic profiles enabled the identification of 32/57 (56%) subjects presenting lower limb muscular imbalance. Thirty-six out of 57 players were identified as having sustained a previous major lower limb injury. Of these 36 players, 23 still showed significant muscular imbalance (64%). New trends in rational training could focus more on the risk of imbalance and implement antagonist strengthening aimed at injury prevention. Such an intervention would benefit not only athletes recovering from injury, but also uninjured players. An interdisciplinary approach involving trainers, a physical coach, and medical staff would be of interest to consider in implementing a prevention programme. [less ▲]

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