The influence of crank rate on peak oxygen consumption during arm crank ergometry     

Paul M. Smith  Michael J. Price  Mike Doherty 《Journal of sports sciences》2013,31(12):955-960

The aim of this study was to assess the influence of three imposed crank rates on the attainment of peak oxygen consumption ( V O 2peak ) and other physiological responses during incremental arm crank ergometry. Twenty physically active, although non-specifically trained, males volunteered for the study. They completed an exercise protocol using an electrically braked arm ergometer (Lode Angio, Groningen, Netherlands) at crank rates of 60, 70 and 80 rev·min -1 . The order of tests was randomized and they were separated by at least 2 days. Peak V O 2 was significantly higher ( P ? 0.05) at 70 and 80 rev·min -1 than at 60 rev·min -1 . Peak ventilation volume increased as a function of crank rate and was higher ( P ? 0.05) at 80 than at 60 rev·min -1 . Peak heart rate was higher ( P ? 0.05) at 70 and 80 rev·min -1 than at 60 rev·min -1 . Furthermore, 70 and 80 rev·min -1 resulted in an extended test time compared with 60 rev·min -1 . The greater physiological responses observed during the tests at the two faster crank rates might have been the result of a postponement of acute localized neuromuscular fatigue, allowing for more work to be completed. We recommend, therefore, that an imposed crank rate between 70 and 80 rev·min -1 should be used to elicit V O 2peak and other physiological responses in arm crank ergometry.  相似文献   

The effects of work – rest duration on intermittent exercise and subsequent performance     

Mike Price  Karl Halabi 《Journal of sports sciences》2013,31(8):835-842

This study examined the effects of different work?–?rest durations during 40?min intermittent treadmill exercise and subsequent running performance. Eight males (mean?±?s: age 24.3?±?2.0 years, body mass 79.4?±?7.0?kg, height 1.77?±?0.05?m) undertook intermittent exercise involving repeated sprints at 120% of the speed at which maximal oxygen uptake (v-[Vdot]O_2max) was attained with passive recovery between each one. The work?–?rest ratio was constant at 1:1.5 with trials involving short (6:9?s), medium (12:18?s) or long (24:36?s) work?–?rest durations. Each trial was followed by a performance run to volitional exhaustion at 150% v-[Vdot]O_2max. After 40?min, mean exercise intensity was greater during the long (68.4?±?9.3%) than the short work?–?rest trial (54.9?±?8.1% [Vdot]O_2max; P?<?0.05). Blood lactate concentration at 10?min was higher in the long and medium than in the short work?–?rest trial (6.1?±?0.8, 5.2?±?0.9, 4.5?±?1.3?mmol?·?l^?1, respectively; P?<?0.05). The respiratory exchange ratio was consistently higher during the long than during the medium and short work?–?rest trials (P <?0.05). Plasma glucose concentration was higher in the long and medium than in the short work?–?rest trial after 40?min of exercise (5.6?±?0.1, 6.6?±?0.2 and 5.3?±?0.5?mmol?·?l^?1, respectively; P?<?0.05). No differences were observed between trials for performance time (72.7?±?14.9, 63.2?±?13.2, 57.6?±?13.5?s for the short, medium and long work?–?rest trial, respectively; P = 0.17), although a relationship between performance time and 40?min plasma glucose was observed (P?<?0.05). The results show that 40?min of intermittent exercise involving long and medium work?–?rest durations elicits greater physiological strain and carbohydrate utilization than the same amount of intermittent exercise undertaken with a short work?–?rest duration.  相似文献   

The role of effort in moderating the anxiety – performance relationship: Testing the prediction of processing efficiency theory in simulated rally driving     

Mark Wilson  Nickolas C. Smith  Mark Chattington  Mike Ford  Dilwyn E. Marple-Horvat 《Journal of sports sciences》2013,31(11):1223-1233

Abstract

We tested some of the key predictions of processing efficiency theory using a simulated rally driving task. Two groups of participants were classified as either dispositionally high or low anxious based on trait anxiety scores and trained on a simulated driving task. Participants then raced individually on two similar courses under counterbalanced experimental conditions designed to manipulate the level of anxiety experienced. The effort exerted on the driving tasks was assessed though self-report (RSME), psychophysiological measures (pupil dilation) and visual gaze data. Efficiency was measured in terms of efficiency of visual processing (search rate) and driving control (variability of wheel and accelerator pedal) indices. Driving performance was measured as the time taken to complete the course. As predicted, increased anxiety had a negative effect on processing efficiency as indexed by the self-report, pupillary response and variability of gaze data. Predicted differences due to dispositional levels of anxiety were also found in the driving control and effort data. Although both groups of drivers performed worse under the threatening condition, the performance of the high trait anxious individuals was affected to a greater extent by the anxiety manipulation than the performance of the low trait anxious drivers. The findings suggest that processing efficiency theory holds promise as a theoretical framework for examining the relationship between anxiety and performance in sport.  相似文献   

‘Trinity Mysteries’: responding to a chaotic reading of Irish history     

Mike Cronin 《国际体育史杂志》2013,30(18):2753-2760

  相似文献   

In the Shadow of Myron: The Impact of the Discobolus on Representations of Olympic Sport from Victorian Britain to Contemporary China     

Mike O'Mahony 《国际体育史杂志》2013,30(7):693-718

Without doubt, the most famous and instantly recognisable work of art associated with the Olympic Games is Myron's Discobolus. Originally produced in bronze in the fifth century BC, the work is now known primarily through later Roman copies in marble, discovered in Italy during the eighteenth century. Whilst much has been written about the Discobolus as an exemplar of antique art, less attention has been paid to the reception of the work in the modern era. Accordingly, this article shifts attention to the impact made by Myron's work in visual culture produced during the period of the modern Olympic Games; that is from the late nineteenth century to the present day. From Victorian public sculptures, to official Olympic films and posters, and even contemporary art produced for the Beijing Games of 2008, Myron's work has continued to cast an influential shadow over art practices related to the Games themselves, as it has been adopted, adapted and transformed to signify a host of new and frequently diverse meanings. The prominent display of the work at the British Museum in London during the Games of 2012 offers testimony to the work's enduring legacy and its relevance for spectators of the present day.  相似文献   

The effects of work:rest duration on physiological and perceptual responses during intermittent exercise and performance     

Mike Price  Paul Moss 《Journal of sports sciences》2013,31(14):1613-1621

Abstract

In this study, we examined the effects of different work:rest durations during 20 min intermittent treadmill running and subsequent performance. Nine males (mean age 25.8 years, s = 6.8; body mass 73.9 kg, s = 8.8; stature 1.75 m, s = 0.05; [Vdot]O_2max 55.5 ml · kg^?1 · min^?1, s = 5.8) undertook repeated sprints at 120% of the speed at which [Vdot]O_2max was attained interspersed with passive recovery. The work:rest ratio was constant (1:1.5) with trials involving either short (6:9 s) or long (24:36 s) work:rest exercise protocols (total exercise time 8 min). Each trial was followed by a performance run to volitional exhaustion at the same running speed. Testing order was randomized and counterbalanced. Heart rate, oxygen consumption, respiratory exchange ratio, and blood glucose were similar between trials (P > 0.05). Blood lactate concentration was greater during the long than the short exercise protocol (P < 0.05), whereas blood pH was lower during the long than the short exercise protocol (7.28, s = 0.11 and 7.30, s = 0.03 at 20 min, respectively; P < 0.05). Perceptions of effort were greater throughout exercise for the long than the short exercise protocol (16.6, s = 1.4 and 15.1, s = 1.6 at 20 min, respectively; P < 0.05) and correlated with blood lactate (r = 0.43) and bicarbonate concentrations (r = ?0.59; P < 0.05). Although blood lactate concentration at 20 min was related to performance time (r = ?0.56; P < 0.05), no differences were observed between trials for time to exhaustion (short exercise protocol: 95.8 s, s = 30.0; long exercise protocol: 92.0 s, s = 37.1) or physiological responses at exhaustion (P > 0.05). Our results demonstrate that 20 min of intermittent exercise involving a long work:rest duration elicits greater metabolic and perceptual strain than intermittent exercise undertaken with a short work:rest duration but does not affect subsequent run time to exhaustion.  相似文献   

Book Reviews     

Steven Wright  Mike McNeill  Joan M. Fry 《Sport, Education and Society》2013,18(2):223-233

This study examined the teaching of games via a tactical approach (also known as teaching games for understanding) from the theoretical perspective of social constructivism. A pilot study (of student teachers (STs) and pupils) informed the ‘main’ study which included collecting data on 49 STs, 58 cooperating teachers (CTs) and 1177 pupils. ST data were collected through videotaping (lessons), interviews and questionnaires; CT data through interviews and questionnaires; and pupil data through questionnaires. Data analysis techniques included systematic coding of teaching behaviours through computer software, using constant comparison to code open-ended question responses, and computing frequencies of Likert-scale question responses. T-tests were used to compare pre- and post-CT workshop data. Findings suggest that STs’ teaching of the tactical approach was in line with a social constructivist perspective, in part because lessons were student-centred. Overall student activity was 53% of all lessons taught, and STs facilitated pupil learning through several question and answer scenarios. Pupils wrote that they enjoyed playing games in what amounted to ‘authentic’ settings. Their responses also suggest that learning took place through ‘legitimate peripheral participation in communities of practice’ and this facilitated pupil movement through the ‘zone of proximal development’. There were indications that pupil experiences were mediated by ST competence. CTs reported that an in-service workshop on the tactical approach and mentoring was beneficial and subsequent pairings with STs elicited positive feelings from both parties.  相似文献   

Understanding the rationale for preschool physical education: implications for practitioners' and children's embodied practices and subjectivity formation     

Nollaig McEvilly  Matthew Atencio  Martine Verheul  Mike Jess 《Sport, Education and Society》2013,18(6):731-748

This paper provides an overview of selected academic research literature that underpins contemporary preschool physical education. We highlight and interrogate diverse rationales and beliefs that serve to influence and structure preschool physical education in various forms. We speculate as to how preschool practitioners and children might engage in specific practices relative to these discourses. Our consideration of preschool physical education discourses relies upon a Foucaultian analysis of the major techniques of power and also raises possibilities of conceptualising subjectivity formation through his concept of the ‘technologies of the self’. Discourses related to motor skill development, play and physical activity, in particular, appear to be prevalent in the selected literature, along with a related pedagogical discourse concerning ‘structure and freedom’. These sometimes competing discourses arguably underpin competing agendas reflecting those who advocate supporting children's free play and those who propose more structured and interventionist practices in relation to young children's physical activity. We conclude that these diverse approaches lend themselves to interpretation and negotiation in the context of preschool physical education, with specific consequences for the embodied experiences and subjectivities of preschool practitioners and children.  相似文献   

White Paper: functionality and efficacy of wrist protectors in snowboarding—towards a harmonized international standard     

Frank I. Michel  Kai-Uwe Schmitt  Richard M. Greenwald  Kelly Russell  Frank I. Simpson  David Schulz  Mike Langran 《Sports Engineering》2013,16(4):197-210

The wrist is the most frequently injured body region among snowboarders. Studies have shown that the risk of sustaining a wrist injury can be reduced by wearing wrist protection. Currently, there are a wide variety of wrist protection products for snowboarding on the market that offer a range of protective features. However, there are no minimum performance standards for snowboarding wrist protectors worldwide. The International Society for Skiing Safety convened a task force to develop a White Paper to evaluate the importance and necessity of a minimum performance for all wrist protectors used in snowboarding. The White Paper outlines the need for a general framework for a harmonized international standard and reviews the existing evidence. Therefore, this White Paper may serve as a common base for future discussions. The broader goal of developing and implementing such a standard is to reduce the incidence and the severity of wrist injuries in snowboarding without increasing the risk of adverse events, such as upper arm or shoulder injury. The European standard for inline skating wrist protectors (EN 14120) can serve as a starting point for efforts related to a standard for snowboard wrist protectors, but certain modifications to the standard would be required. It is hypothesized that implementation of a snowboarding wrist protector standard would result in fewer and less severe wrist injuries in the sport and could translate into more riding days for healthy snowboarders and significant health-care costs savings.  相似文献   

Examining proximal and distal influences on the part-time student experience through an ecological systems theory     

Mike McLinden 《Teaching in Higher Education》2017,22(3):373-388

This conceptual paper contributes to the literature base on promoting equality of opportunity for students in higher education through seeking to broaden understanding of the influences on part-time study in the United Kingdom (UK). These students constitute a significant proportion of the total student population in the UK with research highlighting particular issues they encounter in their learning experience. An analysis of these issues suggests multiple sources of influence within a complex higher education landscape. Bronfenbrenner’s ecological systems theory is drawn upon as a lens through which to examine proximal and distal influences on part-time students and their study experiences in higher education and to propose a research design to facilitate future participation. The paper has significance for educators and researchers concerned with developing understanding of the multilayered influences on participation in higher education in a rapidly changing educational landscape in order to ensure equality of opportunity for all students.  相似文献