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51.
Christophe Cornu Maria-Izabel Almeida Silveira F. Goubel 《European journal of applied physiology》1997,76(3):282-288
The objective of this work was to study the effects of plyometric training on the mechanical properties of the ankle joint
in humans. Changes in the mechanical parameters of this musculo-articular structure were quantified with the aid of a sinusoidal
perturbation technique. This technique allowed the expression of the mechanical impedance of the musculo-articular system
in terms of stiffness, viscosity and inertia. Measurements were performed under passive conditions and when the subject performed
plantar flexion. A 7-week period of training induced a decrease in the slope of the relationship between stiffness and plantar
flexion torque, whereas passive stiffness was increased. A slight decrease in viscosity and an invariability in inertia were
also found. These results are interpreted in terms of the possible adaptations of the musculo-articular structure and ultrastructure
involved in the performance of plantar flexion.
Accepted: 11 April 1997 相似文献
52.
Mansuy JM Peron JM Bureau C Alric L Vinel JP Izopet J 《Journal of clinical microbiology》2004,42(2):912-913
Hepatitis E is an acute and self-limiting hepatitis, and the causative agent, hepatitis E virus, is excreted in feces and orally transmitted. The disease is common in Asia and Africa, causing outbreaks or sporadic cases. In Europe, the infection is generally observed after a history of travel in an area of endemicity. We report on an autochthonous case in southwestern France in which the diagnosis was based on molecular tools rather than serological testing. 相似文献
53.
Maes M De Vos N Pioli R Demedts P Wauters A Neels H Christophe A 《Journal of affective disorders》2000,58(3):241-246
OBJECTIVE: Major depression is associated with defective antioxidant defenses. Vitamin E is the major fat soluble antioxidant in the body. The aim of the present study is to examine serum vitamin E concentrations in major depressed patients versus normal volunteers. METHOD: Serum vitamin E concentrations were measured in 26 healthy volunteers and 42 major depressed patients by means of HPLC. Since vitamin E is a fat soluble vitamin, and serum vitamin E concentrations are strongly related to these of low-density-lipoprotein cholesterol (LDL-C) and triglycerides, we have adjusted the results for possible differences in these lipids. The numbers of peripheral blood leukocytes were measured. RESULTS: Patients with major depression had significantly lower serum vitamin E concentrations than healthy controls. The area under the ROC (receiver operating characteristics) curve was 83%. There were significant and negative correlations between serum vitamin E and number of total leukocytes and neutrophils. CONCLUSIONS: Major depression is accompanied by significantly lower serum vitamin E concentrations, suggesting lower antioxidant defenses against lipid peroxidation. The results could, in part, explain previous findings, which suggest increased lipid peroxidation in major depression. 相似文献
54.
55.
Monosomy 9q and trisomy 16q in a case of congenital solitary infantile myofibromatosis 总被引:1,自引:0,他引:1
Sirvent N Perrin C Lacour JP Maire G Attias R Pedeutour F 《Virchows Archiv : an international journal of pathology》2004,445(5):537-540
Although infantile myofibromatosis (IM) is the most common fibrous proliferation of infancy, many aspects of this benign lesion have not been explored. IM histogenesis is still poorly understood, despite immunohistochemical staining and ultrastructural features that suggest a myofibroblastic origin. IM diagnosis is often made difficult by the predominance of small primitive spindle cells over myofibrobasts and the presence of intravascular growth. Genetic information is scarce, with only one karyotyped case. Here we describe a case of solitary IM discovered at birth in an otherwise healthy girl. The tumor was well circumscribed, arranged in nodules and made up of ovoid cells without atypia, in a myxoid background. Immunohistochemical evaluation indicated a myofibroblastic differentiation. The cytogenetic and fluorescence in situ hybridization analyses revealed an abnormal chromosome 9, derived from an unbalanced whole-arm translocation between chromosomes 9 and 16. On both chromosomes, the breakpoints were located in the pericentric heterochromatic region. This clonal abnormality has not been reported in other tumors and is different from the chromosome 6q deletion reported in the single previous reported IM karyotype. 相似文献
56.
Safety of cryopreservation straws for human gametes or embryos: a study with human immunodeficiency virus-1 under cryopreservation conditions 总被引:3,自引:0,他引:3
57.
Anne Delextrat Thierry Bernard Christophe Hausswirth Fabrice Vercruyssen Jeanick Brisswalter 《Revue canadienne de physiologie appliquée》2003,28(3):356-369
The aim of this study was to investigate the effects of swimming with a wetsuit on energy expenditure during subsequent cycling. Nine well-trained triathletes underwent three submaximal trials. The first trial (SC) consisted of a 750-m swim realised at a competition pace, followed by a 10-min cycling exercise at a power output corresponding to the ventilatory threshold . The two other trials were composed of the same cycling exercise, preceded either by a 750-m swim with a wetsuit (WSC) or by a cycling warm-up (Ctrl). The main results are that the WSC trial was characterised by significantly lower swimming cadence (-14%), heart rate (-11%), and lactate values (-47%) compared to the SC trial, p < 0.05. Moreover, cycling efficiency was significantly higher in the WSC trial compared to the SC trial (12.1% difference, p < 0.05). The lower relative intensity observed during swimming with a wetsuit suggest the relative importance of swimming condition on the total performance in a sprint triathlon. 相似文献
58.
Leucine supplementation improves muscle protein synthesis in elderly men independently of hyperaminoacidaemia 总被引:3,自引:0,他引:3
Isabelle Rieu Michèle Balage Claire Sornet Christophe Giraudet Estelle Pujos Jean Grizard Laurent Mosoni Dominique Dardevet 《The Journal of physiology》2006,575(1):305-315
The present study was designed to assess the effects of dietary leucine supplementation on muscle protein synthesis and whole body protein kinetics in elderly individuals. Twenty healthy male subjects (70 ± 1 years) were studied before and after continuous ingestion of a complete balanced diet supplemented or not with leucine. A primed (3.6 μmol kg−1 ) constant infusion (0.06 μmol kg−1 min−1 ) of l -[1-13 C]phenylalanine was used to determine whole body phenylalanine kinetics as well as fractional synthesis rate (FSR) in the myofibrillar fraction of muscle proteins from vastus lateralis biopsies. Whole body protein kinetics were not affected by leucine supplementation. In contrast, muscle FSR, measured over the 5-h period of feeding, was significantly greater in the volunteers given the leucine-supplemented meals compared with the control group (0.083 ± 0.008 versus 0.053 ± 0.009% h−1 , respectively, P < 0.05). This effect was due only to increased leucine availability because only plasma free leucine concentration significantly differed between the control and leucine-supplemented groups. We conclude that leucine supplementation during feeding improves muscle protein synthesis in the elderly independently of an overall increase of other amino acids. Whether increasing leucine intake in old people may limit muscle protein loss during ageing remains to be determined. 相似文献
59.
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