Detecting bouts of physical activity in a field setting.     

L C Masse  J E Fulton  K L Watson  K C Heesch  H W Kohl  S N Blair  S R Tortolero 《Research quarterly for exercise and sport》1999,70(3):212-219

The purposes of this study were to assess the TRITRAC and CSA for: (a) interaccelerometer agreement; (b) agreement in detecting patterns of moderate-intensity physical activity; and (c) agreement in detecting walking patterns recorded in a diary. Thirty-one women wore both the TRITRAC and CSA accelerometers for three consecutive days. Interaccelerometer agreement (measured with generalizability coefficients) ranged from .88 to .99. In total, 71.3% of the accelerometers' patterns agreed in length, with CSA patterns being on average significantly longer. Interaccelerometer agreement in detecting patterns of brisk walking, as recorded in a diary, was comparable (69.4%). Interaccelerometer discrepancies may be related in part to the threshold employed by each instrument for classifying moderate intensity patterns.  相似文献   

体育运动领域流畅状态的研究进展   总被引：1，自引：0，他引：1  

刘微娜  季浏  Watson Ⅱ Jack C 《体育科学》2009,29(11)

流畅状态是一种理想的内部体验状态,在体育运动领域也被称之为个体从事活动的最佳体验.由于其可以为个体提供良好的心境状态,有助于促进个体对活动的内部动机,提高个体的活动效率,所以,流畅状态作为一个重要的研究领域在运动心理学的发展过程中发挥着重要的作用.拟对体育运动情境中流畅状态的心理特征、模型构建及研究方法进行详细的阐述;并对相关的研究成果加以评述,如流畅状态的跨文化普遍性,体育运动中流畅体验的倾向性差异,流畅一运动技能表现间的关系,影响流畅状态的因素及其相应的调控措施.在此基础上提出,本领域的未来发展应拓展对流畅状态心理特征的研究,即以那些处于非西方文化和西方文化中少数民族文化背景下的群体作为研究对象,进行不同背景的跨文化对比研究;同时,对流畅模型的进一步改进,以充实流畅状态的理论架构,也应成为未来研究的一个焦点;此外,通过目标设置等心理干预手段以促进运动员流畅状态的发生,以及为流畅状态与运动技能建立明确的中介模型,从而应用于运动技能提升的实践情境中也将是未来研究的新主题.  相似文献   

A Content Analysis of Physical Activity in TV Shows Popular Among Adolescents     

Megan S. Gietzen  Sarah E. Gollust  Jennifer A. Linde  Dianne Neumark-Sztainer 《Research quarterly for exercise and sport》2017,88(1):72-82

Purpose: Previous research has demonstrated that television has the potential to influence youth behaviors, but little evidence exists on how television depicts physical activity (PA), an important public health priority for youth. This mixed-methods study investigated depictions of television characters' participation in PA in the top 25 favorite shows ranked by a diverse sample of 2,793 adolescents. Method: Randomly selected episodes from each show were content-analyzed for PA incidents, reasons, and context and in relation to the gender and weight status of participating characters. Results: A total of 374 incidents of PA were coded across 75 episodes, with an average of 5.0 incidents per episode. Although male and female characters were equally likely to engage in at least 1 incident of PA, male characters were involved in a statistically significantly larger proportion of PA incidents than were female characters, and they were more likely to engage in PA for competitive sport. There was no statistically significant difference in engagement in PA or the proportion of PA incidents for characters coded as overweight compared with nonoverweight characters. Conclusions: Although female characters tended to be underrepresented in PA, this study reveals positive messages for how gender and weight are portrayed in relation to PA on TV.  相似文献   

Decision boundaries and receiver operating characteristic curves: new methods for determining accelerometer cutpoints   总被引：2，自引：1，他引：1  

Jago R  Zakeri I  Baranowski T  Watson K 《Journal of sports sciences》2007,25(8):937-944

We propose and evaluate the utility of an alternative method (decision boundaries) for establishing physical activity intensity-related accelerometer cutpoints. Accelerometer data collected from seventy-six 11- to 14-year-old boys during controlled bouts of moderate- and vigorous-intensity field physical activities were assessed. Mean values and standard deviations for moderate- and vigorous-intensity activities were obtained and normal equivalents generated. The decision boundary (the point of intersection of overlapping distributions) was used to create a lower-bound vigorous-intensity cutpoint. Receiver operating characteristic (ROC) curves compared the sensitivity and specificity of the new cutpoint and mean values with the actual activity. There was a 96.5% probability that participants performing vigorous-intensity physical activity were accurately classified when using the decision boundary of 6700 counts per minute, in contrast to the 50% accurately classified when the mean value was used. Inspection of the empirical ROC curve indicated that the decision boundary provided the optimal threshold to distinguish between moderate and vigorous physical activity for this dataset. In conclusion, decision boundaries reduced the error associated with determining accelerometer threshold values. Applying these methods to accelerometer data collected in specific populations will improve the precision with which accelerometer thresholds can be identified.  相似文献   

The brain and fatigue: new opportunities for nutritional interventions?     

Meeusen R  Watson P  Dvorak J 《Journal of sports sciences》2006,24(7):773-782

It is clear that the cause of fatigue is complex, influenced by events occurring in both the periphery and the central nervous system. Work conducted over the last 20 years has focused on the role of brain serotonin and catecholamines in the development of fatigue, and the possibility that manipulation of neurotransmitter precursors may delay the onset of fatigue. While there is some evidence that branched-chain amino acid and tyrosine ingestion can influence perceived exertion and some measures of mental performance, the results of several apparently well-controlled laboratory studies have not demonstrated a positive effect on exercise capacity or performance under temperate conditions. As football is highly reliant upon the successful execution of motor skills and tactics, the possibility that amino acid ingestion may help to attenuate a loss in cognitive function during the later stages of a game would be desirable, even in the absence of no apparent benefit to physical performance. There are several reports of enhanced performance of high-intensity intermittent exercise with carbohydrate ingestion, but at present it is difficult to separate the peripheral effects from any potential impact on the central nervous system. The possibility that changes in central neurotransmission play a role in the aetiology of fatigue when exercise is performed in high ambient temperatures has recently been examined, although the significance of this in relation to the pattern of activity associated with football has yet to be determined.  相似文献   

Supporting the Spectrum Scholarship Program: perspectives from the Northern California and Nevada Medical Library Group     

Sarah McClung  Rachel Keiko Stark  Megan De Armond 《Journal of the Medical Library Association》2022,110(2):243

The immediate past presidents and current president of the Northern California and Nevada Medical Library Group write to raise awareness of the American Library Association Spectrum Scholarship Program, share their approach to supporting Scholars in their region, and encourage Medical Library Association (MLA) chapters and MLA at large to build stronger infrastructures to support Black, Indigenous, and People of Color librarians who are in school and recently graduated.  相似文献   

The Effect of Mobile Support Devices on the Anxiety and Self‐Efficacy of Hospital Float Staff     

Megan Riley McKee  Jeff M. Allen  Robin Tamez 《Performance Improvement Quarterly》2014,27(2):59-81

Floating is the act of staff moving from one unit to another based on the needs of the patients in a hospital. Many staff who float to different units express negative feelings, including anxiety and lack of self‐efficacy. However, floating is an economical and efficient method to use staff across the hospital, especially with current staffing shortages in the United States. This study investigated how the use of mobile performance support devices may help reduce anxiety and increase self‐efficacy for staff who float to different units. With access to multiple resources available on mobile devices, Bandura's social learning theory and self‐efficacy concept set the framework through modeling, observing, and imitating others in order to reproduce certain behaviors and tasks and believe in one's capability to perform. A quantitative study incorporating the retrospective pretest‐posttest design was conducted using the population of float staff, both nurses and respiratory therapists, from Children's Medical Center of Dallas. Both the State‐Trait Anxiety Inventory and General Self‐Efficacy Scale, along with a basic demographic tool, were used to explore anxiety and self‐efficacy in relation to the use of mobile performance support devices. Findings can be used to alleviate the negative feelings of staff toward the idea of floating.  相似文献   

Judgment and Instructional Design: How ID Practitioners Work In Practice     

Colin M. Gray  Cesur Dagli  Muruvvet Demiral‐Uzan  Funda Ergulec  Verily Tan  Abdullah A. Altuwaijri  Khendum Gyabak  Megan Hilligoss  Remzi Kizilboga  Kei Tomita  Elizabeth Boling 《Performance Improvement Quarterly》2015,28(3):25-49

  相似文献   

An exploratory investigation into the factors related to EdTech use among Kenyan girls     

Joe Watson  Jasmin Baier  Winnie Mughogho  Mark Millrine 《British journal of educational technology : journal of the Council for Educational Technology》2023,54(4):1006-1024

This paper contributes to the scarce literature on factors affecting EdTech use in households. These factors were considered through exploratory mixed-methods analyses of cross-sectional data on Kenyan girls and caregivers, captured during the COVID-19 pandemic. Quantitative analysis of the child dataset (n = 544) suggested the importance of both structural factors—such as technology hardware availability—and non-structural factors—including caregiver permission. Findings were supported by a thematic analysis of interview data from girls' caregivers (n = 58), which emphasised the role they play in girls' use of EdTech. Interviews also highlighted numerous caregiver concerns with EdTech, related to the relevance and rigour of educational content, the possibility of children accessing age-inappropriate material and child health (especially eyesight). Policy makers could alleviate these concerns by providing guidance on EdTech use and clearly signalling their approval of verified initiatives.

Practitioner notes

What is already known about this topic

• EdTech can benefit girls' education, yet there are various barriers to it being used.
• Existing research shows clearly that EdTech use can be impeded by structural factors (eg, hardware ownership).
• However, we find insufficient empirical evidence on the role of non-structural or behavioural factors.

What this paper adds

• This paper addresses this gap, using a mixed-methods approach to explore the influence of 33 different measures (including non-structural factors) that could affect the number of hours girls spend using EdTech at home.
• Findings from a quantitative sample of girls (n = 544) and a qualitative sample of girls' caregivers (n = 58) highlighted the importance of non-structural factors, especially caregiver permission.
• The variable most strongly associated with girls' EdTech usage in our selected quantitative model concerned whether this was sanctioned by their caregivers.
• Our qualitative data suggested why caregiver permission to use EdTech might be withheld: caregivers emphasised perceived concerns about the risks and rigour of EdTech.

Implications for practice and/or policy

• Our findings suggest the viability of policy interventions that provide EdTech guidance to caregivers.
• Caregivers uncertain about EdTech could be reassured of the appropriateness of verified initiatives, while those already convinced might be aided in their attempts to support EdTech learning.
• Such guidance could provide a low-cost means of further exploiting the benefits that household EdTech learning can provide.

  相似文献   

Supervision experiences of trans/gender expansive counselors-in-training: An interpretative phenomenological analysis     

Megan Degenstein  Jodi Tangen  Jessica Danielson 《Counselor Education & Supervision》2023,62(4):410-422

Clinical supervisors should be culturally competent working with transgender or gender expansive (TGE) counselors-in-training; however, minimal research exists regarding TGE counselors’ experiences in supervision. This interpretative phenomenological analysis study explored the supervision experiences of five TGE counselors-in-training. Findings revealed four super-ordinate themes and two sub-themes, and implications are discussed.  相似文献