Application clinique du Plasma riche en plaquettes (PRP) pour traiter les lésions tendineuses : revue de la littérature

in Science & Sports (2012), 27(3), 141-153

Tendinopathies are common and frequently resisting to actual conservative measures. The aim of this review was to gather the actual knowledge concerning the platelet-rich plasma (PRP) treatment in tendon ... [more ▼]

Tendinopathies are common and frequently resisting to actual conservative measures. The aim of this review was to gather the actual knowledge concerning the platelet-rich plasma (PRP) treatment in tendon lesion. The interest of this well-known technique, applied since almost 15 years in facial and dental surgery, is growing in the sports world because of its potential ability to treat refractory tendinopathies and to get back quickly a functional use. However, given the relative recent knowledge about PRP in sports medical, the studies could not yet reproduce the beneficial effects obtained in-vitro. Most studies about the subject indeed show an improvement in symptoms after PRP treatment but, because of the many biases introduced, such as the lack of population, the lack of control group or the many different kind of PRP used, the studies cannot be conferred a high level of evidence. Therefore, there is no evidence of formally advise the use of PRP in the treatment of tendinopathy. So the main research field in the close future will have to determine a standard for the manufacture of PRP and the protocols of the future studies in order to be able to compare them. [less ▲]

Les circuits en éducation motrice fondamentale : l’exemple du CEReKi

in Science & Sports (2010), 25

Les profils musculaires inertiels permettent une définition plus précise des charge d'entraînement.

in Science & Sports (2009), (24), 91-94

Aims of the study : the aim of the present study was to explore the interest of inertial load-velocity and load-power relationships for establishing resistance training zones. Materials and methods : 35 ... [more ▼]

Aims of the study : the aim of the present study was to explore the interest of inertial load-velocity and load-power relationships for establishing resistance training zones. Materials and methods : 35 subjects went twice at the laboratory. The first session was used to determine bench press one repetition maximal (1RM) while the second session was used to determine load-velocity and load-power relationships by the means of an inertial dynamometer. For each subject four major training zones (maximal velocity, power-velocity, strength-power, maximal strength), defined from the 1RM, were compared to the corresponding training zones defined from inertial load-velocity and load-power relationships. Results: training zones defined from the 1RM are significantly different (p<0,001) from the ones based on load-velocity and load-power relationships. According to load-power and load-velocity relationships results, maximal bench press velocity should be trained from 0 to 23% of the 1RM ; power-velocity should be trained from 25 to 54% of the 1RM ; strength-power should be trained from 54 to 82% of the 1RM and maximal strength should be trained with superior loads. Such muscular profiles defined with inertial dynamometers allow a more acute and individualised prescription for power-velocity resistance training. [less ▲]

Validité et reproductibilité d’un dynamomètre inertiel basé sur l’accélérométrie

in Science & Sports (2008), 23

Introduction : the purpose of this study was to investigate the validity and reliability of an inertial dynamometer using accelerometry. Methods : fourteen subjects were tested during three successive ... [more ▼]

Introduction : the purpose of this study was to investigate the validity and reliability of an inertial dynamometer using accelerometry. Methods : fourteen subjects were tested during three successive sessions at four increasing loads (30, 50, 70 and 95% of the 1RM). Maximal force, velocity and power performances were simultaneously assessed by the Myotest (Myotest S.A., Switzerland), an inertial dynamometer using accelerometry, and by another control valid dynamometer witch combine accelerometer and linear position transducer. At three first loads, only minor differences appeared between both dynamometers, correlations were excellent and coefficients of variation were good and similars. However, at 95% of the 1RM, Myotest validity and reliability became insufficient. Conclusion : Bench press inertial assessment with accelerometer appeared valid and reliable at 30, 50 and 70% of the 1RM, but not at 95% of the 1RM. [less ▲]

Optojump system efficiency in the assessment of lower limbs explosive strength

in Science & Sports (2005), 20(3), 131-135

Purpose. - The aim of this study was to examine Optojump system efficiency to analyse lower limbs explosive strength. Methods and results. - Twenty untrained subjects were randomly assigned to 2 groups ... [more ▼]

Purpose. - The aim of this study was to examine Optojump system efficiency to analyse lower limbs explosive strength. Methods and results. - Twenty untrained subjects were randomly assigned to 2 groups: either an experimental group (N = 10) or a control group (N = 10). They performed vertical jumps using different techniques and sprints. Reproducibility of jumps and sprint, evaluated by Optojump system, was appreciated after correlation analysis. The experimental group took part in a plyometric training for six weeks. Jumps and sprints showed an excellent reproducibility (mean coefficiant of variation = 3.6%). Plyometric training increased (P < 0.001) counter movement jump (+ 19.6%), counter movement jump free arms (+14%) and drop jump (+27.9%) performances. Conclusion. - This study demonstrated the accuracy and validity of the Optojump system to analyse lower limbs explosive strength. (c) 2005 Elsevier SAS. Tous droits reserves. [less ▲]

Profil isocinétique des muscles fléchisseurs et extenseurs du genou dans une population d’athlètes sauteurs

in Science & Sports (2005), 20(5-6, OCT-DEC), 304-307

Introduction. - This study explored concentric and eccentric profile of knee musculature in a jumpers population. Relationships between isokinetic assessment and field tests performances have also been ... [more ▼]

Introduction. - This study explored concentric and eccentric profile of knee musculature in a jumpers population. Relationships between isokinetic assessment and field tests performances have also been explored. Materials. - Jumpers population presented higher knee flexors performances in concentric and eccentric mode and superior knee extensors strength in eccentric. Significant correlations between isokinetics and field tests results were exclusively observed with athletes quadriceps performances. A very high correlation (r = 0.93) was found between the second bound relative performance of the ten multijumps test and eccentric quadriceps relative peak torque. Conclusion. - Jumpers training may favour a specific muscular development. The knee extensors eccentric strength may be a major factor in the athletic performance. (c) 2005 Elsevier SAS. Tous droits reserves. [less ▲]