Stichwort: Informelles lernen

Ohne Zusammenfassung      

Interactional conditions of syntax acquisition: A review

This paper reviews how and why children's acquistion of syntactic structures is influenced by verbal communication with adults. It argues that those interactions involve cooperative problem-solving and can be interpreted within interactionist theory. It surveys several ways in which adults model a child's syntactic structure to convey the child's intended meaning. These are: expansion; extension; modelling without prior child utterance; and modelling after metalinguistic interruption of the conversation.University of BielefeldState Institute for Early Education     

Internationale Heilpädagogische Woche,Hamburg, März/April 1957

Ohne Zusammenfassung     

The potential of toe flexor muscles to enhance performance

Abstract

The metatarsal phalangeal joint (MPJ) and its crossing toe flexor muscles (TFM) represent the link between the large energy generating leg extensor muscles and the ground. The purpose of this study was to examine the functional adaptability of TFM to increased mechanical stimuli and the effects on walking, running and jumping performance.

Fifteen men performed a heavy resistance TFM strength training with 90% of the maximal voluntary isometric contraction (MVIC) for 7 weeks (560 contractions) for the left and right foot. Maximal MPJ and ankle plantar flexion moments during MVICs were measured in dynamometers before and after the intervention. Motion analyses (inverse dynamics) were performed during barefoot walking, running, and vertical and horizontal jumping. Athletic performance was determined by measuring jump height and distance.

Left (0.21 to 0.38 Nm · kg^?1; P < 0.001) and right (0.24 to 0.40 Nm · kg^?1; P < 0.001) MPJ plantar flexion moments in the dynamometer, external MPJ dorsiflexion moments (0.69 to 0.75 Nm · kg^?1; P = 0.012) and jump distance (2.25 to 2.31 m; P = 0.006) in horizontal jumping increased significantly.

TFM responded highly to increased loading within a few weeks. The increased force potential made a contribution to an athlete's performance enhancement.