Effects of dynamic resistance training on fascicle length and isometric strength

The aims of this study were to assess changes in muscle architecture, isometric and dynamic strength of the leg extensor muscles, resulting from dynamic resistance training, and the relationships between strength and muscle architecture variables. The participants (n = 30) were randomly assigned to one of two groups. The training group (n = 16; age 21.8 +/- 2.3 years, body mass 74.8 +/- 9.2 kg, height 1.75 +/- 0.08 m) performed dynamic resistance training for 13 weeks. The control group (n = 14; age 19.9 +/- 1.5 years, body mass 74.0 +/- 8.5 kg, height 1.76 +/- 0.05 m) did not perform any resistance training. Maximal dynamic and isometric strength were tested in both groups, before and after the training period. The members of the training group used the free-weight squat lift (90 degrees ) as their training exercise. The concentric phase of the squat was performed explosively. Skeletal muscle architecture of the vastus lateralis was visualized using ultrasonography. At the end of the study, significant increases in vastus lateralis muscle thickness (+6.9%, P < 0.001), fascicle length (+10.3%, P < 0.05), one-repetition maximum (+8.2%, P < 0.05), rate of force development (+23.8%, P < 0.05) and average force produced in the first 500 ms (+11.7%, P < 0.05) were seen only in the training group. Adaptations to the muscle architecture in the training group limited the loss of fibre force, and improved the capacity for developing higher velocities of contraction. The architectural changes in the training group were similar to those seen in studies where high-speed training was performed. In conclusion, dynamic resistance training with light loads leads to increases in muscle thickness and fascicle length, which might be related to a more efficient transmission of fibre force to the tendon.     

‘The best school for my child?’ Positions,dispositions and inequalities in school choice in the city of Barcelona

This article deals with the discourses and practices employed by families involved in school choice processes in the city of Barcelona (Spain). It draws upon a study conducted by the authors in 2008/09, and it is based on surveys completed by a representative sample made up of 3245 families, as well as 60 in-depth interviews with families with children at the age of commencing universal pre-primary education (three years old). Firstly, the article focuses on the types of concerns and pressures that families experience when choosing a school for their child. Secondly, we analyse the level and type of knowledge that parents have at their disposal about the field of school choice, as well as how they use and benefit from available information channels. Finally, we identify three unequal positions in which families find themselves when negotiating the field of school choice: ‘maximising’, ‘guaranteeing’ and ‘displaced’. These positions are, in turn, directly related to families’ locations in the social structure, which are also unequal.