[Influence of soccer training on parameters of oxidative stress in erythrocytes].

Introduction: the situations of stress among which physical exercise is included imply the possibility of an excessive production of free radicals and, by their action, an oxidative stress in the cells. To combat these effects, cells have defense mechanisms called antioxidant systems. Objectives: the objective of this study is to analyze the possible physiological changes in relation to parameters related to oxidative stress (MDA) and antioxidant activity (vitamin A, vitamin C and vitamin E) in the erythrocytes of professional soccer players, in comparison with untrained subjects.

[Comparative study of the variables of physical fitness and health among young athletes and sedentary males].

Introduction: today, the practice of physical activity during adolescence brings important physical-health benefits that help develop a future well-being in later life.

Objectives: the objective of this comparative study was to evaluate the physical condition, body composition and cardiorespiratory capacity among young athletes and sedentary people of the Autonomous Community of Extremadura (Spain).

Methods: two hundred and twenty-five male subjects, aged between 12 and 18 years, were divided into two groups: 175 athletes, divided into aerobic group (AEG), anaerobic group (ANAEG) and mixed sports group (MG); and 50 sedentary (SG) or control group.

[Not Available].

Objetivo: el objetivo de este estudio fue analizar la ingesta nutricional de atletas de alto nivel de las especialidades de fondo y medio fondo, durante una temporada atlética, para detectar posibles deficiencias.Métodos: para llevar a cabo el estudio, se procedió a evaluar la dieta y las diferentes concentraciones de los macronutrientes (glúcidos, lípidos y proteínas) y los diferentes tipos de ácidos grasos, en cuatro momentos diferentes de la temporada: al inicio y a los 3, 6 y 9 meses de entrenamiento. La muestra estuvo constituida por un grupo formado por 23 atletas de fondo y medio fondo con un mínimo de 5 años de ntrenamiento, una carga semanal de entre 14-20 horas y un volumen de 100-120 km semanales.