Changes in respiratory muscle and lung function following marathon running in man

Abstract

Respiratory muscle fatigue has been reported following short bouts of high-intensity exercise, and prolonged, moderate-intensity exercise, as evidenced by decrements in inspiratory and expiratory mouth pressures. However, links to functionally relevant outcomes such as breathing effort have been lacking. The present study examined dyspnoea and leg fatigue during a treadmill marathon in nine experienced runners. Maximal inspiratory and expiratory pressure, peak inspiratory and expiratory flow, forced vital capacity, and forced expiratory volume in one second were assessed before, immediately after, and four and 24 hours after a marathon. During the run, leg effort was rated higher than respiratory effort from 18 through 42 km (P < 0.05). Immediately after the marathon, there were significant decreases in maximal inspiratory pressure and peak inspiratory flow (from 118 ± 20 cm H₂O and 6.3 ± 1.4 litres · s^?1 to 100 ± 22 cm H₂O and 4.9 ± 1.5 litres · s^?1 respectively; P < 0.01), while expiratory function remained unchanged. Leg maximum voluntary contraction force was significantly lower post-marathon. Breathing effort correlated significantly with leg fatigue (r = 0.69), but not inspiratory muscle fatigue. Our results confirm that prolonged moderate-intensity exercise induces inspiratory muscle fatigue. Furthermore, they suggest that the relative intensity of inspiratory muscle work during exercise makes some contribution to leg fatigue.     

Understanding teachers’ ‘levels of use’ of learnscapes

All eight teachers and their principal, at an Australian regional primary school in New South Wales (NSW) accredited for its ongoing ‘learnscape’ developments, were interviewed. This was to ascertain their perceptions about the role of learnscapes and their self‐reported use of such outdoor areas to assist in the achievement of their State’s syllabus and environmental education learning outcomes. Teachers at the school (6) and their principal were (re)interviewed a year later to determine if changes in perceptions and practice had occurred and why. This paper interprets narratives derived from the combined interviews of these latter teachers and their principal from an educational change perspective in order to gain insight into their level of use of learnscapes. Teachers’ learnscape and environmental education content and pedagogical knowledge, their focus on the consequences of learnscape use for student learning, and awareness of multiple learning outcomes, including social learning, when using learnscapes, were among interdependent change factors identified which may assist in understanding why teachers embraced learnscapes to different degrees. Consequent avenues for increasing the future use of learnscapes for syllabus and environmental purposes are suggested.     

Development and validation of a method to directly measure the cable force during the hammer throw

The development of cable force during hammer-throw turns is crucial to the throw distance. In this paper, we present a method that is capable of measuring cable force in real time and, as it does not interfere with technique, it is capable of providing immediate feedback to coaches and athletes during training. A strain gauge was mounted on the wires of three hammers to measure the tension in the wire and an elite male hammer thrower executed three throws with each hammer. The output from the gauges was recorded by a data logger positioned on the lower back of the thrower. The throws were captured by three high-speed video cameras and the three-dimensional position of the hammer's head was determined by digitizing the images manually. The five best throws were analysed. The force acting on the hammer's head was calculated from Newton's second law of motion and this was compared with the force measured via the strain gauge. Qualitatively the time dependence of the two forces was essentially the same, although the measured force showed more detail in the troughs of the force-time curves. Quantitatively the average difference between the measured and calculated forces over the five throws was 76 N, which corresponds to a difference of 3.8% for a cable force of 2000 N.     

Lessons from exemplary colleges of education: Factors affecting technology integration in preservice programs

This study focused on efforts in four colleges of education deemed exemplary in their approaches to prepare preservice teachers to use technology. The study addressed one over-arching question: What are the important pieces of the puzzle that make up the current technology integration efforts at these exemplary sites? Data were gathered during the 1997–98 academic year. Findings suggest that there is a web of enabling factors that supports student learning opportunities and desired technology-related outcomes for preservice teachers. The informed leadership of deans and other administrative and faculty leaders appears to be especially critical to sustain and expand technology-integration efforts. Leadership issues, along with a wide range of other factors, are systematically examined across the four case studies. The authors conclude that while each of the four cases is unique, many of the recommended practices explored in this study would likely prove beneficial if employed in other settings.     

A Content Analysis of Peer Feedback in Triadic Supervision

There is limited research on the types of peer feedback exchanged during triadic supervision. Through a content analysis, the authors found that students provided feedback about counseling performance and cognitive counseling skills most often in supervision sessions. However, there were differences in the types of feedback exchanged across three experience levels.     

THE FEASIBILITY AND EFFECTS OF A PARENT‐FACILITATED SOCIAL SKILLS TRAINING PROGRAM ON SOCIAL ENGAGEMENT OF CHILDREN WITH AUTISM SPECTRUM DISORDERS

Due to impairments in social interactions and communication, children with autism spectrum disorders (ASD) have a need for effective social skills training programs. However, many programs fail due to a lack of acquisition, maintenance, and generalization of target skills. The primary purpose of this study was to evaluate the feasibility and outcomes of a parent‐facilitated social skills training program, designed to overcome the shortcomings of acquisition, generalization, and maintenance of other programs for children with ASD. Participants in the current study included 5 children with ASD and their parents, recruited from a western state. This study expands previous research by training parents in implementation of a social skills training program comprising several evidence‐based practices. The results of the parent‐facilitated intervention are provided, and implications for practice and future research are discussed.     

When the governmental tail wags the disciplinary dog: some consequences of national funding policy on doctoral research in New Zealand

This paper explores disciplinary approaches to knowledge production and the supervision of doctoral students in the context of New Zealand’s current Performance Based Research Fund (PBRF). In the last decade New Zealand has experienced significant changes to the way doctoral students are funded by central government. Funding has moved away from a ‘head count’ model to one that rewards specific performance criteria of staff and timely completion of students. In the new regime, research outputs by way of peer reviewed publications, conference presentations, grant awards, postgraduate completions and so forth constitute the significant markers of such performance. Yet in general terms, the production of knowledge varies considerably by academic discipline. This paper uses qualitative methods to explore the potential for the PBRF to privilege some approaches to knowledge production (and models of doctoral supervision) while challenging the viability of others.     

Does size of one’s community affect likelihood of being drafted into the NHL? Analysis of 25 years of data

Abstract

The consistency of community size effects in North American contexts but not elsewhere, reinforces the notion that the effect is driven by socio-cultural factors specific to the country under examination. In order to identify and understand the various forces driving the community size effect, it is important to determine whether the effect has changed over time. Stability or instability over time would assist researchers in identifying the specific socio-cultural mechanisms driving these effects. This study compared the influence of community size on the likelihood of being drafted into the National Hockey League (NHL) among Canadian ice hockey players drafted to play in the NHL between 1985 and 2009. Although there was some variability over the timespan examined, most notably in communities with between 250,000 and 499,999 inhabitants and over 1,000,000 inhabitants, trends were generally stable over time, suggesting that the socio-cultural mechanisms may have also been relatively stable, although further work is necessary to confirm this assumption.     

Comparison of Indirect Calorimetry- and Accelerometry-Based Energy Expenditure during Object Project Skill Performance

This study compared the energy expenditure (EE) levels during object projection skill performance (OPSP) as assessed by indirect calorimetry and accelerometry. Thirty-four adults (female n = 18) aged 18–30 (23.5 ± 2.5 years) performed three, 9-min sessions of kicking, over-arm throwing, and striking performed at 6-, 12-, and 30-sec intervals. EE was estimated (METS) using indirect calorimetry (COSMED K4b2) and hip-worn accelerometry (ActiGraph GT3X+). EE using indirect calorimetry demonstrated moderate-intensity physical activity (3.4 ± 0.7 METS––30-sec interval, 5.8 ± 1.2 METS––12-sec interval) to vigorous intensity physical activity (8.3 ± 1.7 METS––6-sec interval). However, accelerometry predicted EE suggested only light-intensity physical activity (1.7 ± 0.2 METS––30-sec interval, 2.2 ± 0.4 METS––12-sec interval, 2.7 ± 0.6 METS––6-sec interval). Hip-worn, ActiGraph GT3X+ accelerometers do not adequately capture physical activity intensity levels during OPSP, regardless of differences in skill performance intervals.