Auto detecting deliveries in elite cricket fast bowlers using microsensors and machine learning     

Hannah K Jowitt  Jérôme Durussel  Raphael Brandon  Mark King 《Journal of sports sciences》2020,38(7):767-772

ABSTRACT

Cricket fast bowlers are at a high risk of injury occurrence, which has previously been shown to be correlated to bowling workloads. This study aimed to develop and test an algorithm that can automatically, reliably and accurately detect bowling deliveries. Inertial sensor data from a Catapult OptimEye S5 wearable device was collected from both national and international level fast bowlers (n = 35) in both training and matches, at various intensities. A machine-learning based approach was used to develop the algorithm. Outputs were compared with over 20,000 manually recorded events. A high Matthews correlation coefficient (r = 0.945) showed very good agreement between the automatically detected bowling deliveries and manually recorded ones. The algorithm was found to be both sensitive and specific in training (96.3%, 98.3%) and matches (99.6%, 96.9%), respectively. Rare falsely classified events were typically warm-up deliveries or throws preceded by a run. Inertial sensors data processed by a machine-learning based algorithm provide a valid tool to automatically detect bowling events, whilst also providing the opportunity to look at performance metrics associated with fast bowling. This offers the possibility to better monitor bowling workloads across a range of intensities to mitigate injury risk potential and maximise performance.  相似文献   

Editorial     

Jérôme Rossier 《International Journal for Educational and Vocational Guidance》2015,15(1):1-3

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Editorial     

J��r?me Rossier 《International Journal for Educational and Vocational Guidance》2011,11(1):1-2

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The impact of uphill cycling and bicycle suspension on downhill performance during cross-country mountain biking     

Paul W Macdermid  Philip W Fink  Matthew C Miller  Stephen Stannard 《Journal of sports sciences》2017,35(14):1355-1363

ABSTRACT

Non-propulsive work demand has been linked to reduced energetic economy of cross-country mountain biking. The purpose of this study was to determine mechanical, physiological and performance differences and observe economy while riding a downhill section of a cross-country course prior to and following the metabolic “load” of a climb at race pace under two conditions (hardtail and full suspension) expected to alter vibration damping mechanics. Participants completed 1 lap of the track incorporating the same downhill section twice, under two conditions (hardtail and full suspension). Performance was determined by time to complete overall lap and specific terrain sections. Power, cadence, heart rate and oxygen consumption were sampled and logged every second while triaxial accelerometers recorded accelerations (128 Hz) to quantify vibration. No differences between performance times (P = 0.65) or power outputs (P = 0.61) were observed while physiological demand of loaded downhill riding was significantly greater (P < 0.0001) than unloaded. Full suspension decreased total vibrations experienced (P < 0.01) but had no effect on performance (P = 0.97) or physiological (P > 0.05) measures. This study showed minimal advantage of a full suspension bike in our trial, with further investigations over a full race distance warranted.  相似文献   

Just for the fun of it: coaches’ perceptions of an exemplary community youth sport program     

Matthew Vierimaa  Jennifer Turnnidge  Mark Bruner  Jean Côté 《Physical Education & Sport Pedagogy》2017,22(6):603-617

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The effectiveness of front fork systems at damping accelerations during isolated aspects specific to cross-country mountain biking     

Paul W. Macdermid  Matthew C. Miller  Philip W. Fink  Stephen R. Stannard 《Sports biomechanics / International Society of Biomechanics in Sports》2017,16(4):527-539

Cross-country mountain bike suspension reportedly enhances comfort and performance through reduced vibration and impact exposure. This study analysed the effectiveness of three different front fork systems at damping accelerations during the crossing of three isolated obstacles (stairs, drop, and root). One participant completed three trials on six separate occasions in a randomised order using rigid, air-sprung, and carbon leaf-sprung forks. Performance was determined by time to cross obstacles, while triaxial accelerometers quantified impact exposure and damping response. Results identified significant main effect of fork type for performance time (p < 0.05). The air-sprung and leaf-sprung forks were significantly slower than the rigid forks for the stairs (p < 0.05), while air-sprung suspension was slower than the rigid for the root protocol (p < 0.05). There were no differences for the drop protocol (p < 0.05). Rigid forks reduced overall exposure (p < 0.05), specifically at the handlebars for the stairs and drop trials. More detailed analysis presented smaller vertical accelerations at the handlebar for air-sprung and leaf-sprung forks on the stairs (p < 0.05), and drop (p < 0.05) but not the root. As such, it appears that the suspension systems tested were ineffective at reducing overall impact exposure at the handlebar during isolated aspects of cross-country terrain features which may be influenced to a larger extent by rider technique.  相似文献   

Supporting policy-making with social media and e-participation platforms data: A policy analytics framework     

Anthony Simonofski  Jerôme Fink  Corentin Burnay 《Government Information Quarterly》2021,38(3):101590

E-participation enables citizens to have an impact on policy-making through electronic means. Two of the most popular channels are social media and dedicated e-participation platforms. However, the ideas, comments, discussions of citizens on these two channels generate a lot of data to be processed by political representatives or public agents afterwards. Despite the existence of various techniques for social media analytics, literature is scarce regarding the analysis techniques to mine e-participation platforms as well as the possible combination of insights between the two channels.In order to address these gaps, we design a policy analytics framework to leverage insights from e-participation platforms and social media through relevant data analytics to support policy-making. In order to do so, we rely on the Design Science Research methodology. Through the analysis of four different cities in Belgium (Liège, Mons, Marche-en-Famenne, Leuven), we identify policy-makers' requirements and needs of information from platforms and social media. Then, we explore data analysis techniques to address those requirements. Finally, we design an actionable framework, present it as an interactive dashboard and iteratively test it on the case of Liège. This policy analytics framework supports each step of the traditional policy-making process with appropriate data analytics applied to the two sources.  相似文献   

Going Forth: Equal Employment Opportunity in a Deregulatory Climate     

Jennifer Turnnidge  Jean Côté  David J. Hancock 《Quest (Human Kinetics)》2013,65(2):203-217

While previous studies indicate that participation in sport has the potential to facilitate positive developmental outcomes, there is a lack of consensus regarding the possible transfer of these outcomes to other environments (i.e., school or work). An important issue within the positive development literature concerns how sport programs should approach the issue of transfer. This article outlines two distinct approaches to the transfer debate: the explicit approach and the implicit approach. Specifically, this article discusses the relative strengths and limitations of these two approaches with regards to their effectiveness, sustainability, and balance of adult- and youth-driven learning. Recommendations for future research directions are also presented.  相似文献   

Law and Ethics     

Thomas W. Cooper  Conrad C. Fink  Warren Freedman 《Communication Booknotes Quarterly》2013,44(5):92-93

TELEVISION & ETHICS: A BIBLIOGRAPHY by Thomas W. Cooper, et al. (Boston: G.K. Hall, 1988—$45.00 [$55 for export], ISBN 0-8161-9866-8)

MEDIA ETHICS IN THE NEWSROOM AND BEYOND by Conrad C. Fink (New York: McGraw-Hill, 1988—price not given, ISBN 0-07-O20976-6)

FREEDOM OF SPEECH ON PRIVATE PROPERTY by Warren Freedman (Westport, CT: Quorum Books/Greenwood, 1988—$39.95, ISBN 0-89930-323-4)  相似文献   

History     

Robert Friedel  John D. Ryder  Donald G. Fink  A. Michal McMahon  Charles J. Bashe  Thomas C. Leonard 《Communication Booknotes Quarterly》2013,44(4-5):39-40

EDISON'S ELECTRIC LIGHT: BIOGRAPHY OF AN INVENTION by Robert Friedel, et al. (New Brunswick, NJ: Rutgers University Press, 1986—$27.95 until July 1st, then $35)

ENGINEERS & ELECTRONS: A CENTURY OF ELECTRICAL PROGRESS by John D. Ryder and Donald G. Fink (IEEE Press, 345 East 47th St., New York 10017—price not given)

THE MAKING OF A PROFESSION: A CENTURY OF ELECTRICAL ENGINEERING IN AMERICA by A. Michal McMahon (New York: IEEE Press, see address to left, 1984—price not given)

IBM'S EARLY COMPUTERS by Charles J. Bashe, et al (Cambridge, MA: MIT Press, 1986—$27.50)

THE POWER OF THE PRESS: THE BIRTH OF AMERICAN POLITICAL REPORTING by Thomas C. Leonard (New York: Oxford, 1986—$22.50)  相似文献