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Purpose:This study examined the effects of a five-week intervention combining vigorous interval training (VIT) with diet among twenty-four obese adolescents. Fourteen girls and ten boys (aged 14–15) schooled in a pediatric rehabilitation center participated. Methods:The VIT intensity was targeted and remained above 80% of maximal heart rate (HR) and over six kilocalories per minute. Pre- and postintervention measures were body composition (BMI, weight, body fat percentage), physical self-perceptions (PSP), physical fitness (6-min walking distance and work) and its associated physiological responses (HRpeak and blood lactate concentration). A series of two-way analyses of variance or covariance controlling for weight loss were used to examine the changes. Results:Significant improvements were found in body composition, physical fitness and PSP (endurance, activity level, sport competence, global physical self-concept and appearance). In addition, boys presented higher levels of perceived strength and global physical self-concept than girls. Finally, there was a significant increase in perceived endurance, sport competence, and global physical self-concept in girls only. Conclusion:This five-week VIT program combined with diet represents an effective means for improving body composition, physical fitness, and PSP in obese adolescents, the effects on PSP being larger among girls.

Among the running field tests that measure aerobic fitness indirectly, the 20-m shuttle run test is the one most commonly used among obese youth. However, this back and forth running test induces premature cessation of exercise in this population. The present study aimed to examine the psycho-physiological responses of obese adolescents to an intermittent (15-15) progressive and maximal run test as compared with a continuous shuttle run test. Eleven obese adolescents (age: 14-15 years; BMI = 34.01 ± 5.30 kg·m-2) performed both tests. A two-way ANOVA examined the main effects of the running test, participant’s sex, and their interaction on maximal aerobic performance (net exercise duration and final velocity), physiological values (heart rate, pulmonary oxygen uptake, respiratory exchange ratio and blood lactate concentration) and psychological responses (rating of perceived exertion, and physical self-perceptions). Oxygen uptake and heart-rate values at 9 km·h-1 were also compared. Compared with a 20-m shuttle run, the 15-15 test induced lower pulmonary oxygen uptake values at 9 km/h (28.3 ± 2.7 vs. 35.4 ± 2.7 ml·min-1·kg-1) and finished with higher maximal velocity and net exercise duration (566 ± 156 vs. 346 ± 156 s, p < 0.001), with no inter-test physiological difference. The 15-15 test also resulted in higher ratings of perceived exertion (16.0 ± 1.2 vs. 12.7 ± 1.6, p < 0.001) and improved perceived physical condition compared with the 20-m shuttle run (+1.4 ± 1.4 vs. +0.2 ± 1.0, p < 0.05). Both tests induced a maximal aerobic power of obese adolescents, but the 15-15 test provided a more progressive speed increment and longer exercise duration. The 15-15 test also elicited a significant improvement of perceived physical condition. In conclusion the 15-15 test can be considered a relevant field test for assessing the aerobic fitness of obese adolescents.

International audience; This study aims to examine the repeated effects of three sessions of vigorous interval training (VIT) in basketball, running-biking, and boxing on the physical self-perceptions (PSP) of obese adolescents participating in a dietary program. A sample of 24 obese adolescents performed the consecutive VIT sessions every week for 5 weeks. PSP were measured immediately after each training session. Analyses of covariance were used to examine changes in PSP. The results showed rapid and constant increases in PSP with significant differences according to sex, time, type of VIT, and an interaction of sex by time by type of VIT, mainly for basketball.

International audience; The present study tested the effects of sensorial inputs on performance and attentional focus during physical training on a computerized ergometer. 18 students were involved in this study. The experimental procedure consisted in a 3x3x4 mixed design, with 3 practice modalities (virtual feedback, virtual feedback and music, virtual and heart rate feedback) 3 course phases (e.g., flat, uphill, downhill) and 4 sessions. The virtual feedback was a video film of the course subjects had to complete. Video display speed was proportional to the subject's pedalling speed. Results show a training effect on the subjects' overall performance and a reduction of the time spent gazing at video feedback across sessions. The results are discussed in terms of the functional status of sensorial stimulation and its interactions with exercise intensity and subject performance.

International audience; Aim: Examine the interest of progressive intermittent running test (15-15) entitled Spartacus to assess indirectly the global level of aerobic capacity of obese adolescents in comparison with the continuous Shuttle run test.Methods: Forty-three obese adolescents (33 girls and 10 boys) performed the two tests. Differences according to the “test”, “sex” and the interaction “test × sex” have been assessed for the maximum heart rate (HRmax), the final running speed, the total and net running durations and the perceived effort.Results and discussion: The results did not reveal any significant inter-test differences for FCmax and the perceived effort. As compared to the Shuttle run test, the Spartacus led to a 20% increased final running speed (11.5 vs. 9.4 km/h) and a 3.3 times longer total running duration (17.3 vs. 5.3 min) for a 1.7 times longer net exercise duration (8.7 vs. 5.3 min, P < 0.001). The results were neither significantly influenced by the “sex” nor by the “test × sex” interaction.Conclusion: The Spartacus intermittent test allowed obese adolescents to reach a similar psychophysiological state effort at the end of the run while producing an increased performance in both speed and duration.; Objectifs: Déterminer l’intérêt du test intermittent progressif de type 15-15 appelé Spartacus pour mesurer indirectement le niveau global de capacité aérobie d’adolescents obèses en le comparant au test continu Navette.Patients et méthodes: Quarante-trois adolescents obèses (33 filles et 10 garçons) ont réalisé les deux tests. L’influence du « type de test », du « sexe » et de leur interaction a été évaluée sur la fréquence cardiaque maximale (FCmax), la vitesse de fin de test, les durées totale de test et nette de course, et la difficulté perçue.Résultats: Les résultats ne montrent pas de différence significative inter-tests pour la FCmax et la difficulté perçue. Comparé au test Navette, le Spartacus permet d’obtenir une vitesse finale 20 % supérieure (11,5 vs. 9,4 km/h) et une durée totale de test 3,3 fois plus longue (17,3 vs. 5,3 min) pour une durée nette de course 1,7 fois supérieure (8,7 vs. 5,3 min) (p < 0,001). Il n’y a pas d’effets significatifs du « sexe » ni de l’interaction « type de test × sexe ».Conclusion: Le test Spartacus permet d’atteindre un même état psychophysiologique maximal en produisant une vitesse de course et une durée totale de test supérieures.