Is the occurrence of the sticking region the result of diminishing potentiation in bench press?

In this study we investigated if the occurrence of the sticking region was a result of diminishing potentiation (coinciding delayed muscle activation) or the result of a mechanically poor region in which the muscles can produce less force. A regular one-repetition maximum (1RM) free-weight bench press was compared with isometric bench presses performed at 12 different positions. A lower force at the sticking region compared to the other regions in the isometric bench presses would confirm the mechanically-poor-position hypothesis. Twelve resistance-trained males (age 21.7 ± 1.3 years, mass 78 ± 5.8 kg, height 1.81 ± 0.05 m) were tested in 1RM and in isometric contractions in bench press in 12 different positions, indicated by the vertical distance between barbell and sternum, covering the whole range of motion during the concentric phase. Barbell kinematics and muscle activity were registered. In both types of executions a region of lower force output was observed, which supports the mechanically-poor-position hypothesis. Electromyographic activity of four muscles showed the same pattern in the isometric and 1RM attempts. It was concluded that diminishing effect potentiation could not explain the existence of the sticking region.     

Teacher educators’ collaboration in subject departments: collaborative activities and social relations

Teacher educators’ collaboration plays an important role in the improvement of teacher education. Many studies in educational research focus on collaboration from 1 particular perspective. A focus on 2 perspectives, a qualitative (focusing on collaborative activities) as well as a quantitative (focusing on relations) perspective, and relating both perspectives, can add to our knowledge. Data were collected in 3 subject departments of a teacher education institute. Findings indicated that educators’ collaborative networks inside the departments could gain from more coherent and dense relations, and that key players were important to support and sustain collaboration. Both perspectives were mildly related, correlations were found for “degree” and “information” (r = .31, p < .05), “degree” and “joint work” (r = .38, p < .01), and “reciprocity” and “joint work” (r = .33, p < .05), no correlations were found for “degree” or “reciprocity” and “discussing”. At the department level, only mathematics showed significant correlations. Results indicated that, in further research, qualitative aspects as well as quantitative aspects should be included.     

Book review

Gender & Technology: Empowering Women, Engendering Development** London and New York: Zed Books Ltd. . By Everts, Saskia (1998)

Privatising Agricultural Extension in India** Policy Paper 10, National Centre for Agricultural Economics and Policy Research, P.O. Box 11305, New Delhi 110 012, India, February 2000. 95 p. 64 . By Rasheed Sulaiman V and V.V. Sadamate.     

Agricultural development; Opportunities and threats for farmers and implications for extension organisations

Abstract

In many countries agriculture is in a process of rapid change,

• - it has to meet a growing demand for food in a sustainable way,

• - the international competition is increasing,

• - the increase in labour productivity is decreasing the employment opportunities in agriculture,

• - agricultural research is offering many new opportunities to increase productivity,

• - government price support for agricultural products in industrial countries is decreasing.

These changes have many implications for agricultural extension, such as:

• - the knowledge and capabilities of farmers has become a major factor in their ability to compete in national and international markets,

• - advice is not only needed on the adoption of new technologies, but also on many other decisions farmers have to make, such as the choice of their farming system and the decision whether or not to earn an income from outside agriculture,

• - this requires a change in extension methods and in the information sources extension agents use,

• - agricultural development demands painful changes in the way of farming and of living for many farm families. It is a challenge for extension agencies to help farm families to realise this,

• - a major task for leaders of extension organisations is to manage a process of change in agricultural extension. Often the role extension has to play in agricultural development can not be performed by one extension organisation, but only by a pluralistic extension system.

Agricultural extension is often expected to contribute to a reduction of poverty among farmers and farm labourers. One has to think seriously how one can realise this objective.     

The problematic relationship between child development theory and teacher preparation

Abstract

This article addresses questions raised in the past decade regarding the role of child development knowledge for teaching and teacher preparation. Missing from the dialogue on this issue have been the voices of the students enrolled in teacher preparation programs. Accordingly, 77 preservice teachers were surveyed at the conclusion of a child development theory course. The results were examined for themes regarding how preservice teachers come to understand the changing nature of child development, the strengths and limitations of generalized theories of development, and the applicability of child development theory to their future practice.