Stress in elite sport performers: A comparative study of competitive and organizational stressors

The purpose of this study was to compare the content and quantity of competitive and organizational stressors in elite athletes. Ten international performers were interviewed about sources of stress. Content analysis of the data involved categorizing the demands associated primarily and directly with competitive performance (#CS = 21) under the post hoc dimension “performance issues”, and the demands associated primarily and directly with the sport organization (#OS = 72) under one of the following four post hoc dimensions: “environmental issues”, “personal issues”, “leadership issues” and “team issues”. Frequency analysis revealed that the participants mentioned the competitive stressors (Σ = 95) less than the organizational stressors (Σ = 215). Further analysis within these categories showed that the mean number of participants citing individual competitive stressors (M = 4.52) was greater than the mean number of participants citing individual organizational stressors (M = 2.99). The findings indicate that elite athletes experience and recall more demands associated primarily and directly with the sport organization than with competitive performance. Furthermore, this population appears more likely to mention similar competitive stressors but varied organizational stressors, probably because the former are inherent and endemic to elite sport, whereas the latter are essentially extraneous and widely distributed.     

Stress in elite sport performers: a comparative study of competitive and organizational stressors

The purpose of this study was to compare the content and quantity of competitive and organizational stressors in elite athletes. Ten international performers were interviewed about sources of stress. Content analysis of the data involved categorizing the demands associated primarily and directly with competitive performance (#CS = 21) under the post hoc dimension "performance issues", and the demands associated primarily and directly with the sport organization (#OS = 72) under one of the following four post hoc dimensions: "environmental issues", "personal issues", "leadership issues" and "team issues". Frequency analysis revealed that the participants mentioned the competitive stressors (sigma = 95) less than the organizational stressors (sigma = 215). Further analysis within these categories showed that the mean number of participants citing individual competitive stressors (M = 4.52) was greater than the mean number of participants citing individual organizational stressors (M = 2.99). The findings indicate that elite athletes experience and recall more demands associated primarily and directly with the sport organization than with competitive performance. Furthermore, this population appears more likely to mention similar competitive stressors but varied organizational stressors, probably because the former are inherent and endemic to elite sport, whereas the latter are essentially extraneous and widely distributed.     

我国部分球类甲级运动队凝聚力及其对队员动机的影响

通过对我国足球、篮球、排球等10个甲级运动队的82名男运动员进行测试，确立了影响我国球类甲级运动队凝聚力的12个主要因素和预测凝聚力的回归方程，同时对运动队凝聚力水平的高低与运动员动机的关系进行了初步探讨，为我国进一步加强运动队凝聚力建设提供依据和启示。     

Exercise cardiac power and the risk of heart failure in men: A population-based follow-up study

Background:Little is known about exercise cardiac power(ECP),defined as the ratio of directly measured maximal oxygen uptake with peak systolic blood pressure during exercise,on heart failure(HF)risk.We examined the association of ECP and the risk of HF.Methods:This was a population-based cohort study of 2351 men from eastern Finland.The average time to follow-up was 25 years.Participants participated at baseline in an exercise stress test.A total of 313 cases of HF occurred.Results:Men with low ECP(<9.84 mL/mmHg,the lowest quartile)had a 2.37-fold(95%confidence interval(95%CI):1.68-3.35,p<0.0001)hazards ratio of HF as compared with men with high ECP(>13.92 mL/mmHg,the highest quartile),after adjusting for age.Low ECP was associated with a 1.96-fold risk(95%CI:1.38-2.78,p<0.001)of HF after additional adjustment for conventional risk factors.After further adjustment for left ventricular hypertrophy,the results hardly changed(hazards ratio=1.87,95%CI:1.31-2.66,p<0.001).One SD increase in ECP(3.16 mL/mmHg)was associated with a decreased risk of HF by 28%(95%CI:17%-37%).Conclusion:ECP provides a noninvasive and easily available measure from cardiopulmonary exercise tests in predicting HF.However,ECP did not provide additional value over maximal oxygen uptake.     

不同高度的手臂运动与心率变化的研究

目的：通过小样本实验研究,对运动中手臂高度与心率变化的机制进行探析。方法：监测15名受试者在运动中两臂直臂侧上摆和侧下摆的心率变化;两臂侧上屈伸和侧下屈伸的心率变化。结果：运动中手臂高度超过心脏能够促使心跳加速。结论：运动中手臂高度超过心脏能够促使心跳加速主要与重力势能、动力肌肉群做功、运动强度和心脏供血量等参数的变化有关。     

利用团队心率对优秀中长跑运动员高强度间歇跑的监控研究

通过团队心率追踪运动员在间歇训练中的心率变化,并对其进行对比分析,找出运动员在训练中的心率特点,旨在为今后的训练提供参考。     

Validity of Wrist-Worn photoplethysmography devices to measure heart rate: A systematic review and meta-analysis

ABSTRACT

Heart rate (HR), when combined with accelerometry, can dramatically improve estimates of energy expenditure and sleep. Advancements in technology, via the development and introduction of small, low-cost photoplethysmography devices embedded within wrist-worn consumer wearables, have made the collection of heart rate (HR) under free-living conditions more feasible. This systematic review and meta-analysis compared the validity of wrist-worn HR estimates to a criterion measure of HR (electrocardiography ECG or chest strap). Searches of PubMed/Medline, Web of Science, EBSCOhost, PsycINFO, and EMBASE resulted in a total of 44 articles representing 738 effect sizes across 15 different brands. Multi-level random effects meta-analyses resulted in a small mean difference (beats per min, bpm) of ?0.40 bpm (95 confidence interval (CI) ?1.64 to 0.83) during sleep, ?0.01 bpm (?0.02 to 0.00) during rest, ?0.51 bpm (?1.60 to 0.58) during treadmill activities (walking to running), while the mean difference was larger during resistance training (?7.26 bpm, ?10.46 to ?4.07) and cycling (?4.55 bpm, ?7.24 to ?1.87). Mean difference increased by 3 bpm (2.5 to 3.5) per 10 bpm increase of HR for resistance training. Wrist-worn devices that measure HR demonstrate acceptable validity compared to a criterion measure of HR for most common activities.     

加深国人对冬季奥林匹克文化认识和参与程度的思考

奥林匹克运动产生于西方 ,现以发展成全球性的运动。奥林匹克运动不仅仅是体育竞技比赛和运动会 ,而且是一个特定的世界性的社会文化运动。当前 ,国人更多地是了解夏季奥林匹克运动 ,而对冬季奥林匹克运动的了解不是很多。如何使国人更深入了解冬季奥林匹克运动及其文化 ,首先应对奥林匹克与中国联系的历史有所了解 ,对指导这一运动的哲学思想和价值观有所认识 ,以便更多的人们参与 ,进而使国人在实践中 ,体验到奥林匹克是全人类的文化 ,中国应当作出自己的贡献。     

Does modality matter? A latent profile and transition analysis of sedentary behaviours among school-aged youth: The UP&DOWN study

ABSTRACT

The aims of this study were to identify profiles of sedentary behaviour (SB) patterns, based on leisure-time self-reported SB modalities (screen, educative, social, and relaxing) and to evaluate changes in these profiles over 2 years among Spanish youth aged 8–18 years. Latent profile analysis (LPA), a data-driven analytic approach, was used to identify groups of boys and girls (n = 1553; 48% girls; mean±SD age: 12.56 ± 2.49 y) with distinct SB profiles using the SB modalities (time/d) as input variables. Latent transition analysis, an extension of LPA that uses longitudinal data, was used to analyse 2-year changes in these profiles. At baseline, four and three SB profiles were found among boys (labelled: screen, educative, social, and relaxing) and girls (labelled: screen/social, educative, and relaxing), respectively. Overall, more girls (range: 48%-67%) had the same profile over time, than boys (40%-52%). Participants with a screen or relaxing SB profile at baseline were more likely to have an educative profile after 2 years. Youth with a social and an educative SB profile at baseline were more likely to transition to profiles characterized by higher screen and social SB, respectively. Using a novel and person-centered approach, this study identified gender-specific SB profiles that were moderately stable over time.     

抖空竹锻炼对肩周炎影响的研究

探讨抖空竹锻炼对慢性肩周炎患者的康复效果。对60名慢性肩周炎患者进行6个月的抖空竹运动处方锻炼,以疼痛程度评分、肩关节活动度和《中医病证诊断疗效标准》为评价参量,分析和探讨抖空竹的健身价值。结果表明：抖空竹组肩周炎患者疼痛程度较对照组呈显著性下降（P〈0．05）,关节活动度较对照组呈非常显著性提高（P〈0．01）。结论：练习抖空竹对慢性肩周炎具有明显的缓解病痛及康复作用。     

Getting in touch with our feelings: the emotional geographies of gender relations in PETE

This paper attempts to illustrate how embodied ways of knowing may enhance our theoretical understanding within the field of physical education teacher education (PETE). It seeks to illustrate how teacher educators’ viewpoints and understanding of gender relations are inevitably linked to socially constructed webs of emotions, as much as to intellectual rationales. Indeed, the paper argues for the need for PETE research to transcend the dualistic divide of reason/emotion.

It builds upon interview data from an investigation interested in illuminating the ways in which teacher educators develop their professional identities, using the lenses of gender equal opportunities and equity to examine the degree to which identities reflect ‘managerial’ or ‘democratic’ professional projects. In particular it analyses the way in which ‘gender talk’ seems to evoke strong emotional reactions, often ‘negative’ feelings, while at the same time, gender equity concerns remain on the periphery of the discipline, despite increasing research evidence which reveals damaging discriminatory learning environments. By using Hargreaves (2000) concept of ‘emotional geographies’ the paper contends that ‘negative emotions’ about gender issues are currently hegemonic on account of today's configurations of human relations in PETE, because the discipline's feeling rules construct ‘negative feelings’ as being reasonable. Acknowledging that professional identities are on-going projects, and that feeling rules can be re-configured, the paper also seeks to illustrate how competing emotions may in the future lead to gender equality assuming a new role in PETE's ‘regimes of truths’.     

How PETE comes to matter in the performance of social justice education

ABSTRACT

Background: For over four decades, there have been calls for physical education (PE) and physical education teacher education (PETE) to address social inequality and foster social justice. Yet, as numerous studies demonstrate, attempts to educate for social justice in PETE are infrequent and rarely comprehensive. This raises the question why it appears to be possible in some situations but not others, and for some students and not others.

Purpose: The purpose of this paper is to examine the multiple socio-political networks or assemblages in which PETE is embedded and explore how these shape the possibilities for students to engage with the concept of social justice and sociocultural issues (SCI) when learning to teach PE. Two research questions guided this study: How does an orientation for social justice education (SJE) within education policy affect the standards for enacting PETE programs? How is SJE encouraged within PETE programs?

Methodology: Drawing from a broader study of over 70 key personnel in more than 40 PETE programs, we examined how faculty in PETE understand their professional world, identify their subjective meanings of their experiences, and address SCI andSJE within PETE. Data sources included an initial survey, a semi-structured interview, and program artifacts. We analyze the ways that SJE/SCI was represented in three national settings (England, the United States, and New Zealand) and identified common themes.

Results: Examination of each national setting reveals ways that SJE and SCI were enabled and constrained across the national, programmatic, and individual level in each of the countries. The coherence of explicit National policy and curricula, PETE program philosophies, and the presence of multiple individual interests in social justice served to reify a sociocultural agenda. Conversely, possibilities were nullified by narrow or general National Standards, programs that failed to acknowledge sociocultural interests, and the absence of a critical mass of actors with a socio-critical orientation. These differences in assemblage culminated in variations in curriculum time that served to restrict or enable the breadth, frequency, and consistency of the messages surrounding SCI in PETE.

Conclusion: These findings highlight the importance of acknowledging socio-political networks where PETE operates. The agency of PETEs to enact pedagogies that foreground sociocultural interests is contingent on congruity of the networks. The authors caution that although the ‘perfect storm’ of conditions has a profound influence of the possibility of transformational learning of SCI in PETE, this arrangement is always temporary, fluid, and subject to changes in any of the three network levels. Additionally, the success of PETE in enabling graduating PE teachers to recognize the inequities that may be reinforced through the ‘hidden curriculum’ and to problematize the subject area is contingent on the expectations of the schools in which they teach.     

From novice to no know-how: A longitudinal study of implicit motor learning

The aim of this study was to ascertain whether the performances of implicit and explicit learners would converge over an extended period of learning. Participants practised a complex motor skill - golf putting - for 3000 trials, either with a concurrent secondary, tone-counting task (implicit learning) or without such a task (explicit learning). The cognitive demands of the secondary task were predicted to prevent the accumulation of verbalizable rules about the motor task. The implicit group reported significantly fewer rules than the explicit group on subsequent verbal protocols. The performance of the implicit group remained below that of the explicit group throughout the learning phase. However, no significant differences were found between groups during a delayed retention test. Additionally, for the participants in the explicit group only, a Reinvestment Scale score correlated positively with the number of rules accrued and negatively with overall putting performance during the learning phase. We use the results to argue against the excessive use of verbal instruction during skill acquisition, which might be unnecessary and ultimately might hamper performance under stressful conditions.     

Electromyography and the study of sports movements: A review

Within electromyography (EMG), a particular speciality has been developed wherein the aim is to use EMG for the study of muscular function and co‐ordination. This area of research is usually called kinesiological EMG. The general aims of kinesiological EMG are to analyse the function and co‐ordination of muscles in different movements and postures, in healthy subjects as well as in the disabled, in skilled actions as well as during training, in humans as well as in animals, under laboratory conditions as well as during daily or vocational activities. This is often done by a combination of electromyographical and kinesiological or biomechanical measurement techniques.

Because there are over 400 skeletal muscles in the human body and both irregular and complex involvement of the muscles may occur in neuromuscular diseases and in voluntary occupational or sports movements, it is impossible to sample all of the muscles of the entire body during the performance of complex motor skills. In addition, the measurement of kinesiological EMG in sport and specific field circumstances, such as the track and/or soccer field, the alpine ski slope, the swimming pool and the ice rink, demands a specific technological and methodological approach, adaptable to both the field and the sport circumstances.

Sport movement techniques and skills, training approaches and methods, ergonomic verification of the human‐machine interaction have, amongst others, a highly specialized muscular activity in common. The knowledge of such muscular action in all its aspects, its evaluation and its feedback should allow for the optimization of movement, of sports materials, of training possibilities and, in the end, of sports performance.

Drawing conclusions from a review of the EMG research of 32 sports, covering over 100 different complex skills, including methodological approaches, is an impossible task. We have attempted to set standards concerning the EMG methodology at the beginning of this review. Electromyography and sports is a vast area and a complete review is impossible, as information will be found scattered in many different journals, including those on the sports sciences, ergonomics, biomechanics, applied physiology, in different congress proceedings, and so on. Consequently, many important aspects and possibly important publications may have been omitted from this review.     

网球观赛礼仪对城市影响的研究

采用实践总结法、文献资料法和专家访谈法,分析中国网球赛场观众观赛礼仪的现状,阐述了提高观察观赛礼仪对城市文明发展的重要性,并提出培育观众文明观赛礼仪的措施,旨在塑造辽宁良好的城市形象。