<p>This cross-sectional study intended to determine the prevalence of body image dissatisfaction and associated factors in Portuguese adolescents (N=529, 10-18 years, 53.7% male and 46.3% female). The prevalence of body dissatisfaction (estimated through Collins's silhouettes) was 58%. Multivariate logistic regression analyses showed that the variables associated were: obesity, watch TV over 2 hours/day and practice sport activities 4 or more days/week. In male, obesity and watch TV over 2 hours/day were related to body dissatisfaction and among female only obesity had statistical significance. It is necessary to considered different public health interventions for men and women in order to reduce this high body image dissatisfaction.</p>
The purpose of this study was to compare the importance given by novice, intermediate and experienced basketball coaches to training contents. To achieve this purpose, a sample composed of Portuguese basketball coaches (n = 212) described how they rate the importance of technical, tactical, physical and drill contents. According to the results, there is a wide-ranging differential from novice to experienced coaches. First, while experienced coaches tend to focus on tactical development, novice and intermediate coaches seem to privilege the improvement of technical skills. Second, whereas significant differences between novice and intermediate coaches were found, evidence confirmed that they were higher (both in number and weight) when comparing experienced coaches against novice and intermediate. The study provided strong support to justify the necessity to adjust coaches’ knowledge to players’ biological developmental, and could form the basis of focused interventions in coaching development.
The aim was to run a case study of the biomechanics of a wheelchair sprinter racing the 100 m final at the 2016 Paralympic Games. Stroke kinematics was measured by video analysis in each 20 m split. Race kinetics was estimated by employing an analytical model that encompasses the computation of the rolling friction, drag, energy output and energy input. A maximal average speed of 6.97 m s−1 was reached in the last split. It was estimated that the contributions of the rolling friction and drag force would account for 54% and 46% of the total resistance at maximal speed, respectively. Energy input and output increased over the event. However, we failed to note a steady state or any impairment of the energy input and output in the last few metres of the race. Data suggest that the 100 m is too short an event for the sprinter to be able to achieve his maximal power in such a distance.
453The aim of this study was to assess the factorial structure of the Brazilian version of CSAI-2, using several structures suggested in previous studies. Two samples consisted of Brazilian soccer players, 266 from regional level (age 22.87 ± 4.08 years; athletic experience 11.32 ± 4.15 years) and 263 from national level (age 23.16 ± 4.37 years; athletic experience 11.11 ± 4.78 years) were used. The CSAI-2 is a 27-item inventory that measures negativism, physiological activation and self-confidence in a competitive setting. The results of CFA according to the original structure showed some inadequacy of the model. The model proposed by Cox, Martens, Russell (2003), composed of three factors (17-item), demonstrated better adjustment to the regional level sample (χ2/df = 1.871, CFI = .934, GFI = .916, RMSEA = .057), while the model suggested by Coelho, Vasconcelos-Raposo, Fernandes (2007), composed of two factors (18-item), adapted better to the national level sample (χ2/df = 1.701, CFI = .924, GFI = .914, RMSEA = .052). When we analyzed the two samples together, Coelho et al. (2007) was the better model, because it displayed greater invariance. The use of this model was suggested in the assessment of intensity of negative thoughts and the subsequent confirmation of its psychometric properties is recommended.El objetivo de este estudio fue evaluar la estructura factorial de la versión brasileña del CSAI-2, utilizando las estructuras sugeridas en estudios anteriores. Participaron dos muestras de jugadores de fútbol de Brasil, 266 de nivel regional (edad media = 22,87 ± 4.08 años y experiencia deportiva media = 11,32 ± 4,15 años) y 263 del nivel nacional (edad media = 23,16 ± 4,37 años; experiencia deportiva media = 11,11 ± 4,78 años). El CSAI-2 es un cuestionario compuesto por 27 ítems que miden la negatividad, la activación fisiológica y la auto-confianza en un entorno competitivo. Los resultados del AFC de acuerdo a la estructura original mostraron algunos desajustes del modelo. El modelo propuesto por Cox, Martens y Russell (2003), compuesto de tres factores (17 ítems), demostró un mejor ajuste en la muestra de nivel regional (χ2/df = 1,871, CFI = 0,934, GFI = 0,916, RMSEA = 0,057) , mientras que el modelo propuesto por Coelho, Vasconcelos-Raposo y Fernandes (2007), compuesto por dos factores (18 ítems), se ajustó mejor en la muestra de nivel nacional (χ2/df = 1,701, CFI = 0,924, GFI = 0,914, RMSEA = 0,052). Cuando analizamos las dos muestras juntas, el modelo de Coelho et al. (2007) resultó ser mejor, ya que mostró una mayor invarianza. Se sugiere el uso de este modelo en la evaluación de la intensidad de los pensamientos negativos, a la vez que se recomienda la confirmación ulterior de sus propiedades psicométricas.Palabras clave: CSAI-2, análisis factorial confirmatorio, Brasil
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