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See detailIsokinetic and iso-inertial assessments: Competion or complementarity?
Jidovtseff, Boris ULg; Crielaard, Jean-Michel ULg; Croisier, Jean-Louis ULg

in Isokinetics & Exercise Science (2007), 15(1), 52-53

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See detailInfluence of bench press exercise modality on the iso-inertial performance
Jidovtseff, Boris ULg; Croisier, Jean-Louis ULg; Crielaard, Jean-Michel ULg

in Science & Sports (2006), 21(3), 159-162

Introduction. - This study used an iso-inertial dynamometer to investigate the influence of counter-movement and barbell throwing during bench press exercise. A critical analysis of these modalities ... [more ▼]

Introduction. - This study used an iso-inertial dynamometer to investigate the influence of counter-movement and barbell throwing during bench press exercise. A critical analysis of these modalities during muscular evaluation was also performed. Methods. - The action of muscle stretch during the counter-movement induced an increase in average velocity and a shortening of the time to reach the peak power and peak velocity. The barbell throwing did not alter the initial part of the movement yet lengthened the propulsive phase and delayed the braking phase. Consequently, maximal power and maximal velocity performances were improved. However, the throwing of the barbell requires its catch when failing down, which could be potentially harmful. Conclusion. - The counter-movement and the throwing of the barbell significantly change the iso-inertial performances through a bench press exercise. The modalities of bench press assessment execution would have to be rigorously standardized. (c) 2006 Elsevier SAS. Tous droits reserves. [less ▲]

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See detailMise au point d'un dynamomètre de la puissance musculaire
Jidovtseff, Boris ULg

Doctoral thesis (2006)

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See detailThe concept of iso-inertial assessment: Reproducibility analysis and descriptive data
Jidovtseff, Boris ULg; Croisier, Jean-Louis ULg; Lhermerout, Claude ULg et al

in Isokinetics & Exercise Science (2006), 14(1), 53-62

The purpose of this study was to investigate the reproducibility of findings derived from a new iso-inertial dynamometer during bench press (BP) and squat (SQ) and to provide descriptive data for ... [more ▼]

The purpose of this study was to investigate the reproducibility of findings derived from a new iso-inertial dynamometer during bench press (BP) and squat (SQ) and to provide descriptive data for recreational athletes. A position transducer and accelerometer were combined to assess velocity and power during free weight lifting exercises. Simulated movement with a pulley system revealed the excellent technical consistency of the dynamometer. Sixteen male subjects participated in the study. Iso-inertial tests consisted of lifting as fast as possible four different relative loads (35, 50, 70, 90% 1RM in BP and 45, 60, 75, 90% 1RM in SQ). The test was repeated one week later. Analysis of variance revealed no significant variation between sessions or trials. Reproducibility was better in velocity than in power, although it remained fairly good in both exercises (coefficients of variation [CV] never exceeding 10%) except for the time to peak power parameter. Descriptive data confirmed the classical force-velocity and force-power relationships for BP and SQ. In conclusion, this study demonstrated reliable measurements in BP and SQ iso-inertial exercises. Monitoring force-velocity and force-power relationships offers an original functional approach in strength training supervision. [less ▲]

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See detailInter-session, inter-tester and inter-site reproducibility of isometric trunk muscle strength measurements
Demoulin, Christophe ULg; Grosdent, Stéphanie ULg; Debois, I. et al

in Isokinetics & Exercise Science (2006), 14(4), 317-325

The purpose of this study was to investigate the inter-session, inter-tester and inter-site reproducibility of trunk muscle strength scores in flexion, extension, lateral flexion and rotation. Ten healthy ... [more ▼]

The purpose of this study was to investigate the inter-session, inter-tester and inter-site reproducibility of trunk muscle strength scores in flexion, extension, lateral flexion and rotation. Ten healthy students were tested on four apparatus with a 7-10 day break between sessions. The first two sessions were identical while the other two differed either by the tester or by the site. Furthermore, 10 patients with chronic low back dysfunction (CLBD) were assessed with the four apparatus, once only. For all tests, CV ranged from 3.4% to 7.6% and from 3.9% to 8.1% in the inter-session and inter-tester studies, respectively (p > 0.05 except for inter-session reproducibility of trunk flexor strength). Peak torque (PT) was more variable from site to site with a CV ranging from 4.2% to 12.7%, particularly in extension and left lateral flexion (p < 0.05). No statistically significant difference in the strength ratios (flexion/extension, right/left lateral-flexion and right/left rotation) were found between sessions or testers (4.9% < CV < 9.7%). The inter-site reproducibility of ratios was lower. Comparison between the CLBD patients and the healthy subjects with regard to PT normalized to body weight indicated significantly decreased performance for the former except for flexion and rotation scores in males. We conclude that in the case of healthy subjects, inter-session and inter-tester trunk strength measurements derived from these devices are reproducible. The low inter-site reproducibility suggests that caution should be exercised when interpreting findings originating from different sites. The lower extension strength scores in CLBD patients test lends some validity to the system. However, further studies focusing on reproducibility and validity of this system in CLBD patients are critical before any conclusion regarding their clinical viability may be drawn. [less ▲]

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See detailLa vibrotonie corporelle totale : analyse critique et application sportive
Croisier, Jean-Louis ULg; Lehance, Cédric ULg; Jidovtseff, Boris ULg et al

in Abstract Book du Symposium « Actualités en électrothérapie » du CKULg (2006)

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See detailThe use of iso-inertial assessment in monitoring training effects
Jidovtseff, Boris ULg; Crielaard, Jean-Michel ULg; Croisier, Jean-Louis ULg

in Abstract Book “Exercise and muscle physiology” de l’Ecole Doctorale en Sciences de la Motricité (2006)

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See detailIso-inertial fatigue assessment: protocol, descriptive data and reproducibility analysis
Jidovtseff, Boris ULg; Croisier, Jean-Louis ULg; Cordonnier, Caroline ULg et al

in Abstract Book of the 5th International Conference on Strength training (2006)

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See detailProfil isocinétique des muscles fléchisseurs et extenseurs du genou dans une population d’athlètes sauteurs
Jidovtseff, Boris ULg; Croisier, Jean-Louis ULg; Mordant, B. et al

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 ▲]

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See detailInfluence of a short time specific strength training on iso-inertial performances
Jidovtseff, Boris ULg; Croisier, Jean-Louis ULg; Scimar, N. et al

in Abstract Book of the 4th International Conference on Strength Training (Serres, Greece) (2004, November)

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See detailIsokinetic strength and fatigue of the elbow flexors and extensors in sedentary women
Maquet, Didier ULg; Forthomme, Bénédicte ULg; Demoulin, Christophe ULg et al

in Isokinetics & Exercise Science (2004), 12(3), 203-208

Objective. To establish the inter-session reproducibility of isokinetic concentric strength and fatigue profile of the elbow flexors and extensors in sedentary women. Methods. Forty healthy women who were ... [more ▼]

Objective. To establish the inter-session reproducibility of isokinetic concentric strength and fatigue profile of the elbow flexors and extensors in sedentary women. Methods. Forty healthy women who were physically inactive or engaged in recreational sports were included in the study. Strength was evaluated at 60 and 180 degrees/s. The fatigue protocol consisted of 30 maximal-intensity elbow flexion and extension at 180 degrees/s. Results. The extensors were stronger than flexors while no dominance effect was apparent. In addition the work output of the extensors during the fatigue protocol was larger than the flexors', the previous being more fatigue resistant. A dominance effect was observed for the extensors in the fatiguing protocol. Reproducibility expressed by the coefficient of variation was less or equal to 11%. Conclusions. This study highlights satisfactory reproducibility of isokinetic strength and fatigue parameters. The values derived may be useful for interpretation of clinical tests or characterization of pathological states in women with similar characteristics. [less ▲]

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See detailMusculation fonctionnelle : les mouvements de projection
Jidovtseff, Boris ULg; Croisier, Jean-Louis ULg; Crielaard, Jean-Michel ULg

in Actes du Colloque sur l’intervention dans les APS : rétro/perspectives (2002, September)

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See detailSurentrainement et efforts d'endurance
Jidovtseff, Boris ULg; Crielaard, Jean-Michel ULg

in Revue Médicale de Liège (2001), 56(5), 343-52

Optimal training results in exercise-recovery harmonious balance. High frequency and volumic training, associated with insufficient recovery may induce overtraining. It depends on the kind of exercise but ... [more ▼]

Optimal training results in exercise-recovery harmonious balance. High frequency and volumic training, associated with insufficient recovery may induce overtraining. It depends on the kind of exercise but occurs mainly in endurance sports. The high frequency of upper respiratory track infection in endurance sportsmen results from a temporary immunosuppression state, possibly associated with overtraining. Many immune and haematological parameters have been associated with overtraining, but none seemed really efficient for diagnosis. Hormonal parameters, despite contradictions in studies, appear to give a good insight of athlete's staleness and are more predictive of overtraining. Actually, overtraining detection needs a combination of different parameters, and cannot sustain on isolated factors. [less ▲]

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See detailInfluence de la pratique régulière de la longueur et du triple saut sur la force et la puissance des muscles fléchisseurs et extenseurs du genou
Jidovtseff, Boris ULg; Croisier, Jean-Louis ULg; Mordant, Benoît

in Actes du Congrès de la Société Belge de la Médecine et des Sciences du Sport (2001)

Detailed reference viewed: 37 (6 ULg)