Comparison of physiological responses to graded exercise test performance in outrigger canoeing

Abstract

The aim of this study was to establish a graded exercise test protocol for determining the peak physiological responses of female outrigger canoeists. Seventeen trained female outrigger canoeists completed two outrigger ergometer graded exercise test protocols in random order: (1) 25 W power output for 2 min increasing by 7.5 W every minute until exhaustion; and (2) 25 W power output for 2 min increasing by 15 W every 2 min to exhaustion. Heart rate and power output were recorded every 15 s. Expired air was collected continuously and sampled for analysis at 15-s intervals, while blood lactate concentration was measured immediately after and 3, 5, and 7 min after exercise. The peak physiological and performance variables examined included peak oxygen uptake ([Vdot]O_2peak), minute ventilation, tidal volume, ventilatory thresholds 1 and 2, respiratory rate, respiratory exchange ratio, heart rate, blood lactate concentration, power output, performance time, and time to [Vdot]O_2peak. There were no significant differences in peak physiological responses, ventilatory thresholds or performance variables between the two graded exercise test protocols. Despite no significant differences between protocols, due to the large limits of agreement evident between protocols for the peak physiological responses, it is recommended that the same protocol be used for all comparison testing to minimize intra-individual variability of results.     

The extent and causes of home advantage: Some recent insights

The effect of strategy instruction on response time in a sequential keypressing task was compared during acquisition and retention. Specifically, this study determined the influence of: (1) an awareness strategy, (2) a non‐awareness strategy, (3) a Five‐Step Approach strategy and (4) a control condition. Sixty‐four subjects completed 250 trials of nine sequential keypresses, and 50 trials of a dual task (keypresses and verbal report). Faster response times were found for the Five‐Step Approach and non‐awareness strategies during both acquisition and retention. Introducing beginners to strategies that are used by highly skilled performers facilitated response times.     

Sports nutritionists’ perspectives on enablers and barriers to nutritional adherence in high performance sport: A qualitative analysis informed by the COM-B model and theoretical domains framework

ABSTRACT

Athlete adherence to nutritional guidance is critical for optimal health and performance, yet little is known about the barriers and enablers to athletes’ dietary behaviours within high-performance sport. To advance understanding, we applied a theoretical lens derived from the Capability, Opportunity, Motivation – Behaviour (COM-B) model and the Theoretical Domains Framework (TDF) to explore the qualitative accounts of sports nutritionists. Five focus groups comprising sports nutritionists working in Olympic and Paralympic sport (n = 14), professional sport (n = 6), or both (n = 6) were undertaken. Thematic analysis was conducted and the interpretations of the findings were guided by COM-B and the TDF. To achieve nutritional adherence, the behavioural analysis identified the need to intervene across all three COM-B components and at least five associated TDF domains (e.g., decision-making processes, reinforcement, social influences, behavioural regulation and environmental context and resource). For the first time, the findings illustrate the complex interplay of the training setting with the capabilities, opportunities, and motivation of the practitioners, athletes and coaches. By applying established behavioural science theories to sports nutrition, the foundations for the development of targeted and multifaceted behavioural interventions addressing athlete dietary adherence in high-performance sport have been laid.     

Effect of shoulder angle on physiological responses during incremental peak arm crank ergometry

Abstract

This study examined the effect of shoulder angle and gender on physiological and perceptual responses during incremental peak arm ergometry. Healthy adults (nine males, seven females) volunteered for the study and completed an incremental arm ergometry test on two separate occasions at two different shoulder angles (90° and 45°). Initial work rate was set at 16 W · min^?1 and was increased progressively until exhaustion. Cardiorespiratory and perceptual responses were recorded at the end of each minute and compared using separate three-way (position × work rate × gender) repeated-measures analyses of variance. The systematic bias of peak responses was examined using separate two-way (position × gender) analyses of variance, while reproducibility of these parameters was explored using intraclass correlation coefficients, measurement bias/ratio, and 95% ratio limits of agreement. Despite a significantly greater peak heart rate for the 45° position, cardiorespiratory and perceptual responses were similar at peak exercise for both positions. Peak values for all variables, although similar, demonstrated similar and large inter-test variability for men and women. Reduction of the shoulder joint angle to 45° did not enhance peak work rate and peak oxygen consumption during seated upper body exercise. Due to the large inter-test variability, arm ergometry should be conducted using the same seated position.     

The layering of mathematical interpretations through digital media

How might understanding emerge when learners engage mathematical phenomena through digital technologies? This paper considers the ways children’s mathematical thinking was influenced by their interpretations through various pedagogical discourses and how understanding emerged through those various filters. Current research into using digital technologies in mathematics education is predominantly positioned within two theoretical perspectives, semiotic mediation and the instrumental approach. Meanwhile, within a contemporary hermeneutic position, mathematical learning comprises a process of interpretation, where understanding is seen as a formative process as the learner views events from fresh, ever-evolving perspectives. Concepts are then seen in ongoing formation. This paper examines learning through a contemporary hermeneutic frame and the contention is that this opens opportunity for learning to be perceived in alternative ways.     

Medicalised pupils: the case of ADD/ADHD

Changing financial arrangements for undergraduates have led to a growth in widening participation research. However, hardly any studies explore gender differences in the impact of differential funding on students' sense of well‐being, their financial coping strategies and their educational attainment. Our research shows that there are few gender differences in students' actual financial situation, reflecting the similarity of their social class backgrounds, but women perceive themselves to be under greater pressure. Women worry more about their finances and express lower levels of well‐being, but this has no overall effect on their attainment, since the strategies they use to ameliorate worry align with sound educational practice. Men express a more complacent financial attitude, which does not usually affect their attainment. There is, however, evidence of a gender‐related ‘threshold effect’ among students who express low levels of well‐being. Extreme worriers perceive themselves to be, and genuinely are, worse off than other students, despite the apparent homology of their social class backgrounds. In this extreme group, the strategies women devise to cope with worry, such as curtailing their student life and building supportive friendship groups, appear to consolidate their attainment, but men's complacency sometimes pushes them down into the lowest class of degree.     

A case example of assessment and evaluation: Building capability in a corporate university

One corporate university makes measurement a priority by dedicating resources and assigning responsibilities to a centralized analytics function: the assessment, measurement, and evaluation team. As more measurement became a focus for learning and business leaders alike, the more the team became motivated to take a critical look at how it was approaching assessment, measurement, and evaluation activities and how it could leverage its capabilities, technology, and processes to have a greater reach across the organization.     

Ebbs and Flows: A Longitudinal Study of an English Language Instructor’s Motivation to Learn Korean

Native English speaking language teachers who live and work in various parts of the world often express a desire to learn the language of their host country. Without sustained levels of motivation, however, their desires are unlikely to be realized. This article reports the findings of a longitudinal case study of an American English language instructor working at a South Korean university. It examines the factors that impacted her motivation to learn Korean, and explores the ebbs and flows that characterized her motivation over a one-year period. Findings revealed that while the participant did express a desire to learn Korean and formulated learning goals, the action necessary to achieve these goals did not occur. This article draws on the L2 Motivational Self System and the Process Model of L2 Motivation to provide a dual theoretical perspective on the findings.