Dynamometric Strength Profile of Hip Muscles in Youth Soccer Players.

BACKGROUND: Soccer is the most widely practiced sport in the world, demanding high-speed activities such as jumps, sprints and changes of direction. Therefore, having optimal levels of muscle strength improves performance and reduces the injury rate. OBJECTIVES: The objectives of our study were (i) to determine the dynamometric profile of hip muscle strength in young soccer players by position, evaluated at different isokinetic speeds, (ii) to describe the conventional and functional unilateral muscle strength ratios, (iii) to analyze the bilateral balance. METHODS: Thirty-seven male soccer players (age 17.02 ± 0.92 years) participated in the study. Strength assessment was performed with a functional electromechanical dynamometer, and concentric and eccentric strength of abductors, adductors, extensors and hip flexors were measured bilaterally at 0.5 m/s and 1 m/s. RESULTS: For eccentric right hip abduction at 0.5 m/s, defenders are significantly stronger than midfielders (p = 0.013) and stronger than forwards (p = 0.140). For eccentric right hip adduction at 0.5 m/s, defenders are significantly stronger than midfielders (p = 0.005) and stronger than forwards (p = 0.253), as for eccentric right hip adduction at 1 m/s, defenders are significantly stronger than midfielders (p = 0.014) and stronger than forwards (p = 0.084). There is a significant effect for the conventional strength ratio of left abduction/adduction at 1 m/s. The conventional strength ratio of forwards is significantly higher than that of defenders (p = 0.045) and higher than that of midfielders (p = 0.152). CONCLUSIONS: Concentric and eccentric hip strength values differ according to playing position.

Características antropométricas de personal militar masculino chileno / Anthropometric characteristics of Chilean male military personnel

Introducción: La preparación militar en sus distintas aristas es uno de los procesos más duros que viven los sujetos que desarrollan labores en pro de la defensa y mantenimiento de la paz de las naciones. Se espera que esta preparación impacte de manera progresiva en la condición física y composición corporal de los soldados con la finalidad de aportar a un mejor desenvolvimiento en sus labores diarias. Objetivo: Comparar el perfil antropométrico de varones militares chilenos en situación de soldados conscriptos y personal cuadro permanente. Métodos: Se valoraron 83 sujetos militares varones con edades entre los 18,91 ± 1,76 y 51,19 ± 7,96 años, se estimó el índice de masa corporal, la composición corporal y el somatotipo. Resultados: Se encontraron valores más elevados de índice de masa corporal (28,64 ± 3,56), tejido muscular (37,57 ± 5,02 kg) y tejido adiposo (24,95 ± 7,88 kg) en el personal cuadro permanente y menores valores en soldados conscriptos (22,53 ± 2,39) p < 0,000, tejido muscular (33,85 ± 4,11 kg), tejido adiposo (18,12 ± 5,01 kg), p < 0,024. En los componentes del somatotipo, de igual forma, hubo diferencias significativas (p < 0,000) en endomorfía, mesomorfía y ectomorfia. Conclusiones: Los sujetos militares presentan diferencias significativas en cuanto a la composición corporal, el somatotipo y el estado ponderal según su situación contractual. El uso del índice de masa corporal sería complejo de utilizar en sujetos militares, ya que pueden ser erróneamente clasificados en las categorías establecidas para este índice(AU)

Introduction: The military preparation in its different edges is one of the hardest processes that live the subjects that develop work in favor of the defense and maintenance of the peace of the nations. It is expected that this preparation will progressively impact the physical condition and body composition of the soldiers in order to contribute to a better performance in their daily tasks. Objective: To compare the anthropometric profile of Chilean military men in a situation of conscripted soldiers and permanent staff. Methods: 83 male military subjects aged between 18.91 ± 1.76 and 51.19 ± 7.96 years were evaluated, body mass index, body composition and somatotype were estimated. Results: Higher values ​​of body mass index (28.64 ± 3.56), muscle tissue 37.57 ± 5.02 kg and adipose tissue (24.95 ± 7.88 kg) were found in permanent staff and lower values ​​in conscripted soldiers (22.53 ± 2.39) p < 0.000 muscle tissue (33.85 ± 4.11 kg), adipose tissue (18.12 ± 5.01) p < 0.024. In the somatotype components, similarly, there were significant differences (p <0.000) in endomorphy, mesomorphy and ectomorphy. Conclusion: The military subjects present significant differences in terms of body composition, somatotype and weight status according to their contractual situation. The use of the body mass index would be complex to use in military subjects, since these can be erroneously classified in the categories established for the body mass index(AU)