The purpose of this study was to test the relationships between training workload (WL) parameters with variations in anaerobic power and change of direction (COD) in under-16 soccer players. Twenty-three elite players under 16 years were daily monitored for their WL across 20 weeks during the competition soccer season. Additionally, players were assessed three times for anthropometric, body composition, COD, and anaerobic power. A correlational analysis between the mean differences between assessments and accumulated WL parameters were conducted. Moreover, a regression analysis was executed to explain the variations in the percentage of change in fitness levels considering the accumulated WL parameters and peak height velocity. The accumulated daily loads during one week showed a large and a moderate correlation with peak power and COD at different periods of the season. Regression analysis showed no significant predictions for COD (F(12, 10) = 1.2, p = 0.41) prediction, acute load (F(12, 10) = 0.63, p = 0.78), or chronic load (F(12, 10) = 0.59, p = 0.81). In conclusion, it may be assumed that the values of the chronic workload and the accumulated training monotony can be used to better explain the physical capacities of young soccer players, suggesting the importance of psychophysiological instruments to identify the effects of the training process in this population.

INTRODUÇÃO: dados epidemiológicos indicam que a obesidade infantil está aumentando na população brasileira e é apontada como um fator de risco para o desenvolvimento precoce de doenças crônicas. A obesidade tem sido caracterizada pelo aumento do tecido adiposo e do peso corporal.OBJETIVO: diagnosticar e comparar a prevalência de sobrepeso e obesidade em escolares da rede pública EPU e privada EPR. Além disso, foi feita uma correlação entre o IMC e o percentual de gordura corporal em crianças de ambos os sexos.MÉTODOS: foram avaliadas variáveis antropométricas IMC e DOC de meninos n = 91 e meninas n = 109 entre 8 e 10 anos de idade. Foi observada maior prevalência de sobrepeso em meninos 19,6% e meninas 25,5% da EPR em comparação com meninos 6,7% e meninas 8,1% da EPU. O nível de obesidade também foi maior em meninos 34,8% e meninas 31,9% da EPR quando comparado com meninos 6,7% e meninas 6,5% da EPU. Obteve-se correlação positiva entre as variáveis de IMC e percentual de gordura corporal de meninos r = 0,82 e meninas r = 0,85.RESULTADOS: os resultados sugerem que, apesar do aumento em todas as classes sociais, o sobrepeso e a obesidade mostram-se mais presentes naqueles com poder econômico maior, verificando-se, portanto, uma relação socioeconômica. Essa constatação pode levar a um estado de saúde mais próximo do polo negativo.CONCLUSÃO: a análise do IMC demonstrou ser um índice para determinação eficiente de sobrepeso e obesidade em crianças.

Purpose. resistance exercise (rE) with variable resistance (Vr) may be an interesting strategy to increase strength and power in several sports activities. the present study aimed to compare the effect of rE vs. Vr exercise in the back squat on subsequent jump performance at different time points. Methods. Nine male elite handball athletes (age: 21.4 ± 2.1 years; body fat percentage: 10.5 ± 4.2%) undergoing in-season training participated in the study. they randomly completed 3 sets of 5 back squat repetitions at 85% of predicted one-repetition maximum (1rM) with 3-minute rests between sets. they performed rE back squat alone or Vr back squat by combining 55% of 1rM using standard weight plates and 29.7 ± 2.0% of the athlete's 1rM in fully erect position (starting position) with elastic band resistance. Countermovement jump (CMJ) test was applied at baseline, immediately after the conditioning activity (within 15 seconds), and every 2 minutes after the protocols (2, 4, 6, and 8 minutes). Results. there was a very large (5.8%, p = 0.02, ES = 1.53) increase in CMJ performance 2 minutes after Vr back squat, while no significant changes were observed after the completion of rE back squat. Moreover, there was a large (p = 0.04, ES = 1.27) increase in peak power after Vr exercise. Conclusions. CMJ performance and peak power output can be potentiated after 2 minutes of recovery following the completion of back squat exercise combining rE plus elastic bands, reinforcing the practical applicability of Vr exercise.

The present study investigated the motivational factors, behavioral regulations based on self-determination theory framework, and the relationships between basic psychological need satisfaction and actual exercise behaviors of CrossFit and resistance training (RT) participants. A total of 493 subjects (males = 351, females = 148), RT (n = 365, 279 males, 86 females) and Cross-Fit (n = 128, 69 males, 59 females) completed an online questionnaire. Results indicated that CrossFit participants presented higher levels of enjoyment, stress management, social recognition, affiliation, competition, and weight management. Conversely, RT participants reported higher motive for appearance. Intrinsic motivation to exercise was significantly higher in CrossFit, whereas RT participants scored higher controlled motivation. There was no significant difference between weekly exercise volume between groups; therefore, correlation and mediation analysis were conducted with pooled data. Autonomy and competence were significantly associated with more autonomous forms of motivation. Exercise frequency and weekly exercise volume were positively related to intrinsic motivation. When examining the mediating model, competence and intrinsic motivation were found to mediate the relationship between enjoyment and weekly exercise volume. Our results support the relationship among psychological needs satisfaction, intrinsic motivation, and exercise behavior in CrossFit and RT participants. Exercise professionals can encourage individuals to seek self-determined and personally meaningful exercise benefits to promote long-term exercise adherence in fitness centers.

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