Effects of intra-set rest on the ability to repeat work at maximal isometric strength.

BACKGROUND: The aim of this paper was to analyze how the rest between interval repetitions in intra-set training (at maximal isometric loads) could affect the ability to repeat maximal contractions in subjects with different levels of performance and different experience in strength development work. METHODS: Twenty subjects were divided randomly into two different groups depending on their sport characteristics: ten subjects were trained in strength development work (Group Strenght--23.1±4.6 years; 172.0±5.3 cm; 79.9±12.1 kg; 2175.6±490.8 N; 46.9±4.9 mL/kg.min), and ten subjects were trained in endurance work (Group Endurance--21.3±4.5 years; 172.4±4.1 cm; 60.0±4.6 kg; 815.5±206.5 N; 67.4±4.9 mL/kg.min). To assess the ability to repeat maximal efforts, 20 repetitions of 5 seconds were performed in a half-squat position, with 1 minute of rest between repetitions. RESULTS: For both groups, four different phases were observed in the Interval Maximal Force test during the 20-repetition assessment: potentiation, maintenance, moderate loss, and significant loss. For the GE, the loss in maximum strength capacity began in the fourth repetition (GS4th: 3.4%, ns, Effect Size: 0.09 vs. GE3th: 1.6%; ns; ES: 0.06) and reached a statistically significant value in the twelfth repetition (GS12th: 12.7%, P=0.03, ES: 0.35 vs. GE7th: 12.5%; P=0.01; ES: 0.49). The number of repetitions at which the strength began to decrease depended on the subject's sport characteristic and performance level. CONCLUSIONS: This study shows how an appropriate intra-set rest inclusion can significantly increase the work performed in every set without changing the muscle contraction characteristics, thus delaying muscle fatigue and maintaining the desired training objective.

Adecuación a la dieta mediterránea y actividad física en adolescentes de Canarias / Adequacy to mediterranean diet and physical activity in canarian teenagers

El objetivo de este estudio es describir el nivel de adecuación a la dieta mediterránea y su asociación con los niveles de práctica de actividad física en la población adolescente de la Comunidad de Canarias. Se seleccionó una muestra representativa de los estudiantes de ESO (Educación Secundaria Obligatoria) de las escuelas públicas de la Comunidad de Canarias (413 chicos y 387 chicas). La adecuación a la dieta mediterránea se midió con el cuestionario KIDMED y los niveles de práctica de actividad física se obtuvieron mediante el empleo del cuestionario “PACE Adolescent Physical Activity Measure”, recodificando la variable práctica de actividad física en dos grupos, los que cumplían y no cumplían las recomendaciones de práctica de actividad física tanto de intensidad moderada como vigorosa. Un 22,3% de los sujetos estudiados presentaron una dieta de muy baja calidad, un 52,9% un patrón que puede mejorar y un 24,9% una dieta mediterránea óptima. Así como la existencia de una asociación positiva con los niveles de práctica de actividad física. En conclusión, los sujetos estudiados presentaron unos datos nutricionales peores que los de hace diez años para población adolescente nacional y de las comunidades del centro y norte del territorio español. Con un elevado porcentaje de adolescentes (18,8%) que no desayunan. Los adolescentes que realizaban mayores niveles de práctica de actividad física tanto de intensidad moderada como vigorosa, mostraron una mayor adherencia al patrón alimentario que se asocia a la recomendación de dieta mediterránea óptima (AU)

The aim of the study was to describe the adequacy to Mediterranean diet and his association with the levels of practice of physical activity of the adolescent population of Canary Island Community. A representative sample of Canary Island Community secondary public school students (ESO), (413 boys and 387 girls) participated in the study. The adequacy to Mediterranean diet was measured with the KIDMED questionnaire and the levels of practice of physical activity was measured with the “PACE Adolescent Physical Activity Measure”, re-codifying the practical variable of physical activity in two groups, which were fulfilling and fulfilling the recommendations of practice of physical activity so much of intensity moderated like vigorous. A 22.3% of the subjects presented a very low quality diet, a 52.9% a diet that should improve and a 24.9% presented an optimal Mediterranean diet. As well as the existence of a positive association with the levels of practice of physical activity. In conclusion, the studied subjects presented a few nutritional information make a speech that those of ten years ago for teen national population and of the communities of the center and north of the Spanish territory. With a high percentage of teenagers (18,8%) they have not breakfast. And that the teenagers who realized major levels of practice of physical activity so much of intensity moderated like vigorous, showed a major adherence to the food boss who associates to the recommendation of Mediterranean ideal Diet (AU)