Maximal and submaximal physiological responses to adaptation to deep water running

Abstract

The aim of the study was to compare physiological responses between runners adapted and not adapted to deep water running at maximal intensity and the intensity equivalent to the ventilatory threshold. Seventeen runners, either adapted (n = 10) or not adapted (n = 7) to deep water running, participated in the study. Participants in both groups undertook a maximal treadmill running and deep water running graded exercise test in which cardiorespiratory variables were measured. Interactions between adaptation (adapted vs. non-adapted) and condition (treadmill running vs. deep water running) were analysed. The main effects of adaptation and condition were also analysed in isolation. Runners adapted to deep water running experienced less of a reduction in maximum oxygen consumption ([Vdot]O_2max) in deep water running compared with treadmill running than runners not adapted to deep water running. Maximal oxygen consumption, maximal heart rate, maximal ventilation, [Vdot]O₂ at the ventilatory threshold, heart rate at the ventilatory threshold, and ventilation at the ventilatory threshold were significantly higher during treadmill than deep water running. Therefore, we conclude that adaptation to deep water running reduces the difference in [Vdot]O_2max between the two modalities, possibly due to an increase in muscle recruitment. The results of this study support previous findings of a lower maximal and submaximal physiological response on deep water running for most of the measured parameters.     

Book Reviews

A Century of Science Publishing: A Collection of Essays Edited by E.H. Fredriksson Amsterdam: IOS Press, 2001. US$49/€44/€31 A User's Guide to Copyright, 6th edn Michael Flint, Nick Fitzpatrick and Clive Thorne Tottell Publishing, 2006, ISBN 1845920686, 639 pp., paperback, £78 Publishing Law, 3rd edn Hugh Jones and Christopher Benson Taylor and Francis, 2006 ISBN 0 415 38427 3 Scientific Style and Format: The CSE Manual for Authors, Editors, and Publishers , 7th edn Style Manual Committee, Council of Science Editors Council of Science Editors in cooperation with The Rockefeller University Press, 2006, xvi + 659 pp. Hardback. ISBN 0‐9779665‐0‐X The Trouble with Medical Journals Richard Smith Royal Society of Medicine, 2006, ISBN 1 85315 673 6, 292pp., £19.95     

‘When I am being rushed it slows down my brain’: constructing self-understandings as a mathematics learner

Understanding learning disabilities (LDs) as constructed through multiple cultural practices including discourse, this paper focuses on a Latino middle school student with a LD named Elijah. This study documents both the discourses and practices used to position Elijah as a mathematics learner, as well as his use of similar discourses as he constructs a complex set of self-understandings as a mathematics learner. Elijah is positioned by discourses that prioritise speed as an indicator of mathematical ability, as well as discourses that construct students with LD as having both intelligence and differences such as processing speed. An analysis of interview and observational data suggests that Elijah constructed a unique set of self-understandings as a mathematics learner. Like his sixth-grade special education teacher, Elijah seems to differentiate between knowledge and the performance of knowledge in school. He created a unique identity as both ‘fast’ and ‘slow’ in mathematics, rejecting the binary found in many mathematics classrooms. These findings suggest that multiple discourses circulate in schools about ability and disability in mathematics.     

The dialogic space offered by curriculum-making in the process of learning to teach,and the creation of a progressive knowledge-led curriculum

There is widespread system response to the perceived needs of education for twenty-first century, where learning-to-learn is privileged and schools are organised to prepare young people for work. One casualty of such skills-led teaching is deep thinking about curriculum questions and the knowledge contents of teaching in relation to the needs, motivations and experiential knowledge of students. In this paper we argue for greater conceptual clarity between curriculum and pedagogy, and between the worlds of children’s experience and disciplinary knowledge, in order to deepen teachers’ understanding of the practice of teaching. The paper shows how using the conceptual tools of curriculum making is key to becoming, and developing as a teacher. This paper supports subject specialism in teaching in a manner that respects the social and cultural capital of young people and their role in knowledge creation together with the emancipatory significance of gaining epistemic access to disciplinary knowledge.     

Completion of knowledge codification: an illustration through the ISO 9000 standards implementation process

This paper looks at the role played by the ISO 9000 registration process in contributing to the knowledge codification within the firms. The ISO 9000 standards concern the way a company should elaborate a quality system by providing guidelines and models. They are considered as a code, i.e. a common language, which leads to communication and industrial relationship. This paper focuses on how this code might be used within the firms to enhance knowledge codification. It explains the standards implementation process by studying the three steps needed to complete codification within the firm: (1) the starting point of the implementation; (2) the subject of the codification, that means the material and behavioural characteristics of the production process; (3) the impact of the ISO 9000 implementation on knowledge accumulation within the firm. This paper addresses the fact that the ISO implementation is related to knowledge codification through a learning process, which includes both individual and collective knowledge conversions.     

Assessing tackle performance using a novel collision sport simulator in comparison to a “live” one-on-one tackling drill

It is necessary to study the rugby tackle as it is associated with successful performance outcomes and is responsible for the majority of contact injuries. A novel collision sport simulator was developed to study tackle performance. The main aim of this validation study was to assess tackle technique performance between two different conditions: simulator versus a standardised one-on-one tackle drill previously used to assess technique. Tackling proficiency was assessed using a list of technical criteria. Mean scores, standard deviations and Cohen’s d effect sizes were calculated. Mean overall score for dynamic i.e. running simulator tackles was 7.78 (95%CI 7.58–7.99) (out of 9) or 87% (standard deviation or SD±8.94), and mean overall score for dynamic “live” tackles was 7.85 (95%CI 7.57–8.13) (out of 9) or 87% (SD±9.60) (effect size = 0.08; trivial; p > 0.05). Mean overall score for static i.e. standing simulator tackles was 7.45 (95%CI 7.20–7.69) (out of 9) or 83% (SD±10.71), and mean overall score for static “live” tackles was 8.05 (95%CI 7.83–8.27) (out of 9) or 89% (SD±7.53) (effect size = 0.72; moderate; p < 0.001). The simulator replicates dynamic tackle technique comparable to real-life tackle drills. It may be used for research analysing various aspects of the tackle in rugby and other contact sports.     

Relationships between self-concept and directly observed behaviors in kindergarten children

Twenty kindergarten children who were nominated by teachers as not being socially and academically competent (low-rated) and 36 kindergarten children who were nominated by teachers as competent (high-rated) participated in this study. Self-concept and academic achievement data were gathered on each subject. In addition, all children were observed in class, with particular attention to compliance/non-compliance with adult requests, on-task/off-task behavior, and positive/negative social behaviors with peers. The results indicate that: (a) The factor structure of the self-concept instrument (Primary Self-concept Inventory) was replicated in both groups of children. (b) There were no significant differences in self-concept scores among high- vs. low-rated children. (c) There were profound differences in academic and social behaviors that were found to covary with positive self-evaluations within the two study groups. In general, high-rated children who felt best about themselves were higher achievers and more compliant than were their study group cohorts. Low-rated children who felt best about themselves were, on the contrary, more off-task, more negative in their peer contacts, and inferior academically to their study group cohorts.     

Exercise and working memory: an individual differences investigation

In the current work we asked whether executive function, as measured by tests of working memory capacity, might benefit from an acute bout of exercise and, more specifically, whether individuals who are lower or higher in working memory to begin with would be more or less affected by an exercise manipulation. Healthy adults completed working memory measures in a nonexercise (baseline) session and immediately following a 30-min self-paced bout of exercise on a treadmill (exercise session). Sessions were conducted 1 week apart and session order was counterbalanced across participants. A significant Session x Working Memory interaction was obtained such that only those individuals lowest in working memory benefited from the exercise manipulation. This work suggests that acute bouts of exercise may be most beneficial for healthy adults whose cognitive performance is generally the lowest, and it demonstrates that the impact of exercise on cognition is not uniform across all individuals.