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1.
The present study investigated the nomological validity of the Amotivation Inventory–Physical Education (Shen, Wingert, Li, Sun, & Rukavina, 2010b Shen, B., Wingert, R. K., Li, W., Sun, H. and Rukavina, P. B. 2010b. An amotivation model in physical education. Journal of Teaching in Physical Education, 29: 7284. [Web of Science ®] [Google Scholar]) scores by examining the associations of ability, effort, value, and task characteristics amotivation beliefs with self-determination theory variables. Data were collected from 401 fifth- and sixth-grade students, 416 middle-school students, and 401 high-school students. After providing support for the correlated four-factor structure, the hierarchical structure, internal consistency, and composite reliability of the Amotivation Inventory–Physical Education scores, large negative correlations emerged with perceived autonomy support by the PE teacher; needs for autonomy, competence, and relatedness; identified regulation; intrinsic motivation; and students' subjective vitality. Strong positive correlations were obtained with unidimensional amotivation and external regulation, and weak correlations were obtained with introjected regulation. Also, multidimensional amotivation beliefs partially mediated the relationship between the need for autonomy and subjective vitality. The results provided support for the nomological aspect of construct validity of the Amotivation Inventory–Physical Education scores.  相似文献   

2.
ABSTRACT

Introduction: Since the 1990s, the notion of intervention has expanded with growing interest in the analysis of practices in Francophone country. French-speaking research community considers intervention sciences as a specific field of research in sport and PE. The aim of this literature review was to characterize the penetration of Francophone research in the English-language literature in physical education and sport concerned with intervention since 2010 in the category ‘Education & Educational Research’ of the Journal Citation Reports (2017). This research was in line with the analysis of the papers presented during six Francophone congresses from 2000 to 2010 of the Association for Research on Intervention in Sport (Musard and Poggi 2015 Musard, Mathilde, and Marie-Paule Poggi. 2015. “Intervention in Physical Education and Sport: Trends and Developments in a Decade of Francophone Research.” Physical Education and Sport Pedagogy 20 (3): 250267. doi:10.1080/17408989.2013.817008.[Taylor & Francis Online], [Web of Science ®] [Google Scholar]).

Methods: The selection of articles was carried out in three stages: selection of journals, selection of articles manually, the second level of selection. The selection of journals is do in this category "Education & Educational Research" (JCR, 2017) focusing primarily on sport and physical education. Six journals met these criteria: Physical Education and Sport Pedagogy, European Physical Education Review, Journal of Teaching in Physical Education, Sport Education and society, Quest, Journal of Hospitality Leisure Sport & Tourism Education. Then, the selection of articles was manually analyzing all the publications of each journal since 2010 (almost 2000 articles) according to inclusion criteria "sport or physical education", "francophone authors", and "intervention". Each 46 articles selected was classified according to its theoretical framework. The last stage of selection corresponded to an analyze and an extension of the literature review by a French-speaking specialist in each theoretical framework.

Results: The results show that French-language research on/in/for intervention is in close connection with the international tradition. Some approaches such as didactique, a technological approach, and course of action, have a Francophone specificity based on various international theoretical anchors; others such as motor learning, social psychology, ecological approach come from non-French-speaking international theoretical frameworks.

Discussion and conclusion: These findings raise the question of the Francophone specificity of intervention sciences. Beyond particular French-speaking theoretical frameworks, concepts and concerns join Anglophone traditions. As in the international fields of ‘sport pedagogy’ or ‘praxis’, the Francophone intervention sciences are composed of a diversity of theoretical approaches and are focused towards an epistemology of action. These two communities can enrich each other and deserve more interaction and exchange.  相似文献   

3.
The purpose of this study was to examine the underlying structure of the second edition of the Test of Gross Motor Development-2 (Ulrich, 2000 Ulrich, D. A. 2000. Test of gross motor development: Examiner's manual, 2nd, Austin, TX: Pro-.  [Google Scholar]) as applied to Chinese children. The Test of Gross Motor Development-2 was administered to 626 Hong Kong Chinese children. The outlier test with standard scoring was utilized. After data screening, a total of 614 cases (N = 614) were used for further analysis. The two-factor structure of the Test of Gross Motor Development-2 was tested using confirmatory factor analysis with maximum likelihood estimation to compute parameter estimates and to select the appropriate item for each factor. The goodness-of-fit indices supported that the model was tenable (goodness-of-fit index = .95, root mean square error of approximation = .06, standardized root mean square residual = .04, comparative-fit index = .97). The findings of this study suggested that the two-factor structure proposed by Ulrich (2000 Ulrich, D. A. 2000. Test of gross motor development: Examiner's manual, 2nd, Austin, TX: Pro-.  [Google Scholar]) fit the data of Hong Kong Chinese children.  相似文献   

4.
5.
Abstract

A scale has recently been developed to measure moral disengagement in sport (Boardley & Kavussanu, 2007 Boardley, I. D. and Kavussanu, M. 2007. Development and validation of the Moral Disengagement in Sport Scale. Journal of Sport & Exercise Psychology, 29: 608628. [PubMed], [Web of Science ®] [Google Scholar]). It consists of 32 items that measure the eight mechanisms of moral disengagement proposed by Bandura (1991 Bandura, A. 1991. “Social cognitive theory of moral thought and action”. In Handbook of moral behaviour and development: Theory, research, and applications, Edited by: Kurtines, W. M. and Gewirtz, J. L. Vol. 1, 71129. Hillsdale, NJ: Lawrence Erlbaum Associates.  [Google Scholar]). In the present study, we aimed to: (a) examine whether a subset of these items could form a short version of the scale; (b) provide evidence for the construct validity of the short version; and (c) test its measurement invariance across sex and sport type. A total of 992 football, rugby, hockey, basketball, and netball players from three different samples completed the long version of the scale. Data analyses indicated that the short version of the scale consisted of eight items and had high internal consistency. Construct validity of the scale was evidenced via correlations with sport moral disengagement and prosocial and antisocial behaviour. Multisample confirmatory factor analyses established measurement invariance across sex and partial measurement invariance across four team sports. In conclusion, the short version of the scale is a reliable and valid measure of moral disengagement in sport.  相似文献   

6.
This study assessed the performance of the original version of the Physical Self-Perception Profile (PSPP; Fox & Corbin, 1989 Fox, K. R. and Corbin, C. B. 1989. The Physical Self-Perception Profile: Development and preliminary validation. Journal of Sport and Exercise Psychology, 11: 408430. [Crossref], [Web of Science ®] [Google Scholar]) as compared to a revised version. University students (N?=?259) participated in the study, each answering and comparing the clarity of the original and a revised PSPP. While participants found the revised version to be significantly clearer, it performed similarly to the original in select analyses of internal consistency and construct validity. The original structured alternative format did not have lower levels of socially desirable responding, as compared to the Likert-type ordered response scale format of the revised PSPP. Because the revised version was deemed clearer, performed similarly to the original on select psychometric analyses, and did not have any data loss, there is merit in further examining additional validity and reliability evidence for the revised PSPP.  相似文献   

7.
Abstract

The aims of this study were twofold: (a) to determine if dispositional achievement goal orientation profiles that are reported in the literature would be observed in a sample of youth athletes, and (b) to examine potential achievement goal orientation profile differences on perceptions of the motivational climate, perceptions of peer relationships, and motivation-related responses. Male soccer players (n = 223) aged 9–12 years (mean = 10.9, s = 0.6) completed a multi-section questionnaire containing assessments of dispositional goal (task, ego) orientations, the perceived task- and ego-involving features of the motivational climate, perceived peer acceptance and friendship quality (positive friendship quality, conflict), perceived ability, soccer enjoyment, and satisfaction with one's performance and the team. Four profiles were observed that closely matched those observed by Hodge and Petlichkoff (2000 Hodge, K. and Petlichkoff, L. 2000. Goal profiles in sport motivation: A cluster analysis. Journal of Sport & Exercise Psychology, 22: 256272. [Crossref], [Web of Science ®] [Google Scholar]), though in the present study a lower proportion of participants exhibited achievement goal profiles consisting of relatively high ego orientation. Achievement goal profile differences were found for all variables except positive friendship quality, with a general trend for those reporting relatively lower task goal orientation to exhibit less adaptive responses. Overall, the findings support achievement goal frameworks (e.g. Nicholls, 1989 Nicholls, J. G. 1989. The competitive ethos and democratic education, Cambridge, MA: Harvard University Press.  [Google Scholar]) and suggest that further examination of dispositional achievement goals may afford a deeper understanding of social relationships and motivational processes in youth sport.  相似文献   

8.
Abstract

Coping strategies are important for performance in sport and individual differences may contribute to the coping strategies adopted by athletes. In this study, we explored the main and interactive effects of the big five personality dimensions on sport-related coping and compared personality profiles of discrete groups of athletes. Altogether, 253 athletes (mean age 21.1 years, s = 3.7) completed the NEO-FFI (Costa & McCrae, 1992 Costa, P. T. and McCrae, R. R. 1992. Revised NEO personality inventory and NEO five-factor inventory: Professional manual, Odessa, FL: Psychological Assessment Resources.  [Google Scholar]), and the Coping Function Questionnaire for Sport (Kowalski & Crocker, 2001 Kowalski, K. C. and Crocker, P. R. E. 2001. Development and validation of the Coping Function Questionnaire for adolescents in sport. Journal of Sport and Exercise Psychology, 23: 136155. [Web of Science ®] [Google Scholar]). Results showed that extraverted athletes, who were also emotionally stable and open to new experiences (a three-way interaction effect), reported a greater use of problem-focused coping strategies. Conscientious athletes (main effect), and athletes displaying high levels of extraversion, openness, and agreeableness (a three-way interaction effect), reported a greater use of emotion-focused coping strategies, and athletes with low levels of openness, or high levels of neuroticism (main effects), reported a greater use of avoidance coping strategies. Different personality characteristics were observed between higher-level and lower-level athletes, between men and women athletes, and between individual and team sport athletes. These findings suggest that the five-factor model of personality can help distinguish various levels of athletic involvement and can help identify the coping strategies athletes are likely to adopt during participation.  相似文献   

9.
Initial teacher education (ITE) students participate in various workplaces within schools and in doing so, form understandings about the numerous, and at times competing, expectations of teachers’ work. Through these experiences they form understandings about themselves as health and physical education (HPE) teachers.

This paper examines the ways communities of practice within HPE subject department offices function as sites of workplace learning for student teachers. In particular this research focused on how ITE students negotiate tacit and contradictory expectations as well as social tasks during the practicum and the ways in which their understandings are mediated through participation in the workspace.

Qualitative methods of survey and semi-structured interview were used to collect data on a cohort of student teachers during and following their major (10 week) practicum experience. Analysis was informed by theories of communities of practice (Wenger, 1998 Wenger, E. 1998. Communities of practice: learning, meaning, and identity, Cambridge: Cambridge University Press. [Crossref] [Google Scholar]), workplace learning (Billett, 2001 Billett, S. 2001. Learning in the workplace: strategies for effective practice, Crows Nest, NSW: Allen & Unwin.  [Google Scholar]), and social task systems (Doyle, 1977 Doyle, W. 1977. Learning in the classroom environment: an ecological analysis. Journal of Teacher Education, 28(6): 5155. [Crossref], [Web of Science ®] [Google Scholar]).

It was evident that considerable effort, attention, and energy was expended on various interrelated social tasks aimed at building positive relationships with their supervisor and other HPE teachers at the school. The social dynamics were highly nuanced and required a game-like approach. In our view the complexity that student teachers must negotiate in striving for an excellent evaluation warrants specific attention in physical education teacher education (PETE) programs. This study raises questions regarding our responsibilities in sending student teachers into contexts that might even be described as toxic. We offer some suggestions for how PETE might better support students going into practicum contexts that might be regarded as problematic workplaces.  相似文献   

10.
The aim of this research was to develop an exercise-related goal orientation measure in an attempt to further researchers' and practitioners' current understanding of individuals' motivation to exercise for health and recreational purposes. The Goal Orientation in Exercise Measure (GOEM) was developed to assess individuals' proneness to endorse task or ego goals. Participants included 372 males and females from 16 recreational physical activity clubs in Southeast England. Confirmatory factor analysis (CFA) supported the two-factor model and demonstrated invariance between sexes. Internal consistency for task and ego subscales was .78 and .88, respectively, while correlations between the goal orientations and behavioral regulations (Markland & Tobin, 2004 Markland, D. and Tobin, V. 2004. A modification to the Behavioural Regulation in Exercise Questionnaire to include an assessment of amotivation. Journal of Sport & Exercise Psychology, 26: 191196. [Crossref], [Web of Science ®] [Google Scholar]) served to provide initial evidence for the construct validity of the measure. The development of the GOEM may allow for a broader understanding of the motivational processes implicated in exercise-related domains.  相似文献   

11.
The Trichotomous Achievement Goal Scale was developed by Agbuga and Xiang (2008 Agbuga, B. and Xiang, P. 2008. Achievement goals and their relations to self-reported persistence/effort in secondary physical education: A trichotomous achievement goal framework. Journal of Teaching in Physical Education, 27: 179191. [Web of Science ®] [Google Scholar]) by including selected items from the scales of Duda and Nicholls (1992 Duda, J. L. and Nicholls, J. 1992. Dimensions of achievement motivation in schoolwork and sport. Journal of Educational Psychology, 84: 290299. [Crossref], [Web of Science ®] [Google Scholar]), Elliot (1999 Elliot, A. J. 1999. Approach and avoidance motivation and achievement goals. Educational Psychologist, 34: 169189. [Taylor & Francis Online], [Web of Science ®] [Google Scholar]), and Elliot and Church (1997 Elliot, A. J. and Church, M. A. 1997. A hierarchical model of approach and avoidance achievement motivation. Journal of Personality and Social Psychology, 72: 218232. [Crossref], [Web of Science ®] [Google Scholar]) and adapting them into Turkish. The scale consists of 18 items, and students rated each item on a 7-point Likert scale. To ascertain the validity and reliability of the Trichotomous Achievement Goal Scale, it was administered to 845 female and 861 male Turkish high school students attending three public schools in the 2008–2009 spring semester. Exploratory and confirmatory factor analyses were conducted, and Cronbach's alpha and Fornell and Larcker's (1981 Fornell, C. and Larcker, D. F. 1981. Evaluating structural equation models with unobservable variables and measurement error. Journal of Marketing Research, 18: 3950. [Crossref], [Web of Science ®] [Google Scholar]) criteria were tested on the items that measured the students' achievements, screening for the three distinct types of achievement goals proposed by the trichotomous framework. Based on the results of the study, the 16-item Trichotomous Achievement Goal Scale can be claimed as a valid a reliable scale.  相似文献   

12.
13.
The goal of the current study was to establish the factor validity of the Questionnaire Assessing School Physical Activity Environment (Robertson-Wilson, Lévesque, & Holden, 2007 Robertson-Wilson, J., Lévesque, L. and Holden, R. R. 2007. Development of a questionnaire assessing school physical activity environment. Measurement in Physical Education and Exercise Science, 11: 93107. [Taylor & Francis Online] [Google Scholar]) using confirmatory factor analysis procedures. Another goal was to establish internal reliability and test–retest reliability. The confirmatory factor analysis results of this study supported a slightly altered version of the Questionnaire Assessing School Physical Activity Environment's school physical activity environment subscale. Internal reliability was adequate, while test–retest reliability was questionable. In brief, the pattern of findings indicated that while the original Questionnaire Assessing School Physical Activity Environment is likely adequate for some research purposes, a slightly modified version (Questionnaire Assessing School Physical Activity Environment-R) was psychometrically stronger. However, given the distinct differences in samples used in the original validation study and the current study, more research on the psychometric properties of the Questionnaire Assessing School Physical Activity Environment is needed to determine if the current results and Robertson-Wilson et al.'s (2007 Robertson-Wilson, J., Lévesque, L. and Holden, R. R. 2007. Development of a questionnaire assessing school physical activity environment. Measurement in Physical Education and Exercise Science, 11: 93107. [Taylor & Francis Online] [Google Scholar]) results are sample specific.  相似文献   

14.
Abstract

Numerous variables influence burnout, one of which is leader–member exchange. The present study was conducted to determine whether leader–member exchange quality affects burnout in professional footballers. The study used the Leader-Member Exchange-7 scale developed by Scandura and Graen (1984 Scandura, T. A. and Graen, G. B. 1984. Moderating effects of initial leader–member exchange status on the effects of a leadership intervention. Journal of Applied Psychology, 69: 428436. [Crossref], [Web of Science ®] [Google Scholar]) to measure leader (coach)–member (player) exchange and Pines's (2005 Pines, A. M. 2005. The burnout measure, short version. International Journal of Stress Management, 12: 7888. [Crossref] [Google Scholar]) abbreviated version of the burnout scale developed by Pines and Aronson (1988 Pines, A. M. and Aronson, E. 1988. Career bumout: Causes and cures, New York: Free Press.  [Google Scholar]) to measure burnout. The data were obtained from the professional players (N = 107) of six football clubs in the Turkish Secondary Football League in western Turkey. The results demonstrated that quality of leader–member exchange significantly and inversely influenced burnout of professional footballers. The study also evaluated quality of leader–member exchange in terms of three strengths of relationship (low, fair, and high) between the coach and players. Contrary to expectations, the results revealed significant differences in burnout when comparing low versus fair quality and low versus high quality, while no significant difference in burnout was observed between fair and high quality.  相似文献   

15.
Abstract

Confidence has been one of the most consistent factors in distinguishing the successful from the unsuccessful athletes (Gould, Weiss, & Weinberg, 1981 Gould, D., Weiss, M. and Weinberg, R. 1981. Psychological characteristics of successful and non-successful Big Ten wrestlers. Journal of Sport Psychology, 3: 6981.  [Google Scholar]) and Bandura (1997 Bandura, A. 1997. Self-efficacy. The exercise of control, New York: W. H. Freeman.  [Google Scholar]) proposed that imagery is one way to enhance confidence. Therefore, the purpose of the present study was to examine the relationship between imagery use and confidence in soccer (football) players. The participants included 122 male and female soccer athletes ages 11–14 years participating in both house/recreation (n = 72) and travel/competitive (n = 50) levels. Athletes completed three questionnaires; one measuring the frequency of imagery use, one assessing generalised self-confidence, and one assessing self-efficacy in soccer. A series of regression analyses found that Motivational General-Mastery (MG-M) imagery was a signifant predictor of self-confidence and self-efficacy in both recreational and competitive youth soccer players. More specifically, MG-M imagery accounted for between 40 and 57% of the variance for both self-confidence and self-efficacy with two other functions (MG-A and MS) contributing marginally in the self-confidence regression for recreational athletes. These findings suggest that if a youth athlete, regardless of competitive level, wants to increase his/her self-confidence or self-efficacy through the use of imagery, the MG-M function should be emphasised.  相似文献   

16.
Abstract

Oudejans, Bakker, and Beek (2007 Oudejans, R. R. D., Bakker, F. C. and Beek, P. J. 2007. Helsen, Gillis and Weston (2006) err in testing the optical error hypothesis. Journal of Sports Sciences, [Web of Science ®] [Google Scholar]) recognize several relevant aspects of offside judgements in association football in the paper by Helsen, Gilis, and Weston (2006 Helsen, W. F., Gilis, B. and Weston, M. 2006. Errors in judging “offside” in football: Test of the optical error versus the perceptual flash-lag hypothesis. Journal of Sports Sciences, 24: 521528. [Taylor & Francis Online], [Web of Science ®] [Google Scholar]). We agree that the existing knowledge base on offside assessment needs to be expanded for two reasons. First, from a theoretical point of view it is important to examine how assistant referees can learn to deal with the limitations of the human visual information processing system. Second, from a practical point of view it is relevant to understand better refereeing performances and to identify potential explanations for incorrect offside decisions that could impact on the final outcome of the game. Oudejans et al. (2007 Oudejans, R. R. D., Bakker, F. C. and Beek, P. J. 2007. Helsen, Gillis and Weston (2006) err in testing the optical error hypothesis. Journal of Sports Sciences, [Web of Science ®] [Google Scholar]) believe we both misinterpreted the optical error hypothesis and that our data set was unsuited to test it. Below, we react to these comments.  相似文献   

17.
Abstract

The aim of this study was to examine stressors, coping, and coping effectiveness as a function of gender, type of sport, and skill. The sample consisted of 749 undergraduate athletes (455 males, 294 females) aged 18 – 38 years (mean = 19.8 years). Skill was classified as international/national, county, university, and club standard. Participants completed a stressor and coping concept map (Novak & Gowin, 1984 Novak, J. D. and Gowin, D. B. 1984. Learning how to learn, Cambridge: Cambridge University Press. [Crossref] [Google Scholar]). The results revealed gender, type of sport, and skill differences in relation to stressor frequencies, coping strategy deployment, and coping effectiveness. In contrast to previous research, females used a variety of problem-focused (e.g. planning, communication, technique-orientated coping) strategies more frequently than males. Team sport athletes reported a variety of sport-specific stressors relating to the demands of playing in a team environment. The group of national/international athletes reported using more planning, blocking, and visualization, and also reported that their coping was more effective than that of less-skilled athletes.  相似文献   

18.
Abstract

This study documents the effect of players' dismissals on team performance in professional soccer. Our aim was to determine whether the punishment meted out for unacceptable player behaviour results in reduced team performance. The official web site of the German Soccer Association was used for coding data from games played in the first Bundesliga between the 1963 – 64 and 2003 – 04 (n = 41) seasons. A sample of 743 games where at least one red card was issued was used to test hypotheses derived from crisis theory (Bar-Eli & Tenenbaum, 1989a Bar-Eli, M. and Tenenbaum, G. 1989a. A theory of individual psychological crisis in competitive sport. Applied Psychology, 38: 107120. [Crossref], [Web of Science ®] [Google Scholar]). Players' dismissals weaken a sanctioned team in terms of the goals and final score following the punishment. The chances of a sanctioned team scoring or winning were substantially reduced following the sanction. Most cards were issued in the later stages of matches. The statistics pertaining to outcome results as a function of game standing, game location, and time phases – all strongly support the view that teams can be considered conceptually similar to individuals regarding the link between stress and performance. To further develop the concept of team and individual psychological performance crisis in competition, it is recommended that reversal theory (Apter, 1982 Apter, M. J. 1982. The experience of motivation: The theory of psychological reversals, London: Academic Press.  [Google Scholar]) and self-monitoring and distraction theories (Baumeister, 1984 Baumeister, R. F. and Steinhilber, A. 1984. Paradoxical effects of supportive audiences on performance under pressure: The home field disadvantage in sports championships. Journal of Personality and Social Psychology, 47: 8593. [Crossref], [Web of Science ®] [Google Scholar]) be included in the design of future investigations pertaining to choking under pressure.  相似文献   

19.
This study explores the longitudinal and subgroup measurement properties of a 10-item, physical activity decisional balance scale, previously published by Plotnikoff, Blanchard, Hotz, and Rhodes (2001 Plotnikoff, R. C., Blanchard, C., Hotz, S. B. and Rhodes, R. 2001. Validation of the decisional balance scales in the exercise domain from the Transtheoretical Model: A longitudinal test. Measurement in Physical Education and Exercise Science, 5: 191206. [Taylor & Francis Online] [Google Scholar]), within a diabetic sample of Canadian adults. Results indicated that a three-factor measurement model consistently improved model fit compared to the previously published two-factor model. Evidence of configural, metric, and scalar measurement invariance across time and among subgroups suggests that the 10-item decisional balance scale is appropriate for investigating associative relationships with other constructs and for comparing group means of the pros and cons subscales among a variety of diabetic population subgroups.  相似文献   

20.
Abstract

Swain (1997 Swain, D. P. 1997. A model for optimizing cycling performance by varying power on hills and in wind. Medicine and Science in Sports and Exercise, 29: 11041108. [Crossref], [PubMed], [Web of Science ®] [Google Scholar]) employed the mathematical model of Di Prampero et al. (1979 Di Prampero, P. E., Cortili, G., Mognoni, P. and Saibene, F. 1979. Equation of motion of a cyclist. Journal of Applied Physiology, 47: 201206. [PubMed], [Web of Science ®] [Google Scholar]) to predict that, for cycling time-trials, the optimal pacing strategy is to vary power in parallel with the changes experienced in gradient and wind speed. We used a more up-to-date mathematical model with validated coefficients (Martin et al., 1998 Martin, J. C., Milliken, D. L., Cobb, J. E., McFadden, K. L. and Coggan, A. R. 1998. Validation of a mathematical model for road cycling power. Journal of Applied Biomechanics, 14: 276291. [Crossref], [PubMed], [Web of Science ®] [Google Scholar]) to quantify the time savings that would result from such optimization of pacing strategy. A hypothetical cyclist (mass = 70 kg) and bicycle (mass = 10 kg) were studied under varying hypothetical wind velocities (?10 to 10 m · s?1), gradients (?10 to 10%), and pacing strategies. Mean rider power outputs of 164, 289, and 394 W were chosen to mirror baseline performances studied previously. The three race scenarios were: (i) a 10-km time-trial with alternating 1-km sections of 10% and ?10% gradient; (ii) a 40-km time-trial with alternating 5-km sections of 4.4 and ?4.4 m · s?1 wind (Swain, 1997 Swain, D. P. 1997. A model for optimizing cycling performance by varying power on hills and in wind. Medicine and Science in Sports and Exercise, 29: 11041108. [Crossref], [PubMed], [Web of Science ®] [Google Scholar]); and (iii) the 40-km time-trial delimited by Jeukendrup and Martin (2001 Jeukendrup, A. E. and Martin, J. 2001. Improving cycling performance: How should we spend our time and money?. Sports Medicine, 31: 559569. [Crossref], [PubMed], [Web of Science ®] [Google Scholar]). Varying a mean power of 289 W by ± 10% during Swain's (1997 Swain, D. P. 1997. A model for optimizing cycling performance by varying power on hills and in wind. Medicine and Science in Sports and Exercise, 29: 11041108. [Crossref], [PubMed], [Web of Science ®] [Google Scholar]) hilly and windy courses resulted in time savings of 126 and 51 s, respectively. Time savings for most race scenarios were greater than those suggested by Swain (1997 Swain, D. P. 1997. A model for optimizing cycling performance by varying power on hills and in wind. Medicine and Science in Sports and Exercise, 29: 11041108. [Crossref], [PubMed], [Web of Science ®] [Google Scholar]). For a mean power of 289 W over the “standard” 40-km time-trial, a time saving of 26 s was observed with a power variability of 10%. The largest time savings were found for the hypothetical riders with the lowest mean power output who could vary power to the greatest extent. Our findings confirm that time savings are possible in cycling time-trials if the rider varies power in parallel with hill gradient and wind direction. With a more recent mathematical model, we found slightly greater time savings than those reported by Swain (1997 Swain, D. P. 1997. A model for optimizing cycling performance by varying power on hills and in wind. Medicine and Science in Sports and Exercise, 29: 11041108. [Crossref], [PubMed], [Web of Science ®] [Google Scholar]). These time savings compared favourably with the predicted benefits of interventions such as altitude training or ingestion of carbohydrate-electrolyte drinks. Nevertheless, the extent to which such power output variations can be tolerated by a cyclist during a time-trial is still unclear.  相似文献   

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