Letter from America (Pipe Dreams)     

B Cronin  H Crawford 《International Journal of Information Management》1998,18(6):461-464

  相似文献   

Uniform separable differential operators with parameters     

Ravi P. Agarwal  Donal O’Regan 《Journal of The Franklin Institute》2010,347(1):2-16

In this paper we study boundary value problems for anisotropic partial differential-operator equations with parameters. The principal part of the appropriate differential operators are not self-adjoint. Several conditions for the uniform separability in weighted Banach-valued L_p-spaces are given. Sharp estimates for the resolvent of the corresponding differential operator are obtained. In particular the positivity and R-positivity of these operators are established. As an application we study the separability of degenerate DOEs, maximal regularity for degenerate abstract parabolic problem with parameters, the uniform separability of finite and infinite systems for degenerate anisotropic partial differential equations with parameters.  相似文献   

‘Being’ in the coaching world: new insights on youth performance coaching from an interpretative phenomenological approach     

Colum Cronin  Kathleen M. Armour 《Sport, Education and Society》2017,22(8):919-931

Since Heidegger's influential text; Being and time (1927/2005), the phenomenological question of what it means to ‘be’ has generated a vast body of work. This paper reports data from a phenomenological study that investigated what it means to ‘be’ a youth performance coach. An overview of the interpretive phenomenological methods used is followed by presentation of coaches and data. Data analysis resulted in the identification of three constituent ‘essences’ of youth performance coaching: (i) care; (ii) a commitment to educate athletes authentically for corporeal challenges to come; and (iii) working with others to achieve a specialised corporeal excellence. The three identified essences manifest themselves in a broad lifeworld that includes settings on and off the field of play (FOP). Given the very different insights into the practice of coaching that emerge from this study, we argue it would be useful for future studies of coaching practice and coach education to extend their focus to take into account coaches' wider lives both on and off the FOP. We also argue for further exploration of coaching by drawing on phenomenological concepts such as care and relationality.  相似文献   

Digital entrepreneurship: doing business on the information superhighway     

Howard Rosenbaum  Blaise Cronin 《International Journal of Information Management》1993,13(6)

  相似文献   

The utility of cadaver‐based approaches for the teaching of human anatomy: A survey of British and Irish anatomy teachers          下载免费PDF全文

Joy Y. Balta  Michael Cronin  John F. Cryan  Siobhain M. O'Mahony 《Anatomical sciences education》2017,10(2):137-143

Utilizing reality anatomy such as dissection and demonstrating using cadavers has been described as a superior way to create meaning. The chemicals used to embalm cadavers differentially alter the tissue of the human body, which has led to the usage of different processes along the hard to soft‐fixed spectrum of preserved cadavers. A questionnaire based approach was used to gain a better insight into the opinion of anatomists on the use of preserved cadavers for the teaching of human anatomy. This study focused on anatomy teachers in the United Kingdom and Ireland. From the 125 participating anatomists, 34.4% were medically qualified, 30.4% had a PhD in a non‐anatomical science and 22.4% had a PhD in an anatomical science, these figures include ten anatomists who had combinations of MD with the two other PhD qualifications. The main findings from the questionnaire were that 61.6% of participants agreed that hard‐fixed formalin cadavers accurately resemble features of a human body whereas 21.6% disagreed. Moreover, anatomists rated the teaching aids on how accurately they resemble features of the human body as follows: plastic models the least accurate followed by plastinated specimens, hard fixed cadavers; soft preserved cadavers were considered to be the most accurate when it comes to resembling features of the human body. Though anatomists considered soft preserved cadavers as the most accurate tool, further research is required in order to investigate which techniques or methods provide better teaching tool for a range of anatomical teaching levels and for surgical training. Anat Sci Educ 10: 137–143. © 2016 American Association of Anatomists.  相似文献   

Life skills development and enjoyment in youth soccer: The importance of parental behaviours     

Gareth J. Mossman  Lorcan D. Cronin 《Journal of sports sciences》2019,37(8):850-856

This study investigated the relationships between parental behaviours and players’ life skills development and enjoyment within youth soccer. In total, 317 players (Mage = 12.83, SD = 1.70, age range = 10–16 years) completed a survey assessing parental behaviours (praise and understanding, directive behaviour, and pressure), perceived life skills development (teamwork, goal setting, time management, emotional skills, interpersonal communication, social skills, leadership, and problem solving and decision making), and enjoyment of soccer. Multiple regression analyses found that praise and understanding was the key contributor to the outcome variables, making the largest unique contribution to teamwork, goal setting, leadership, and total life skills. Directive behaviour made the largest unique contribution to emotional skills, and problem solving and decision making; whereas pressure made the largest unique contribution to participants’ time management and social skills. In practice, the results suggest that parents should display praise and understanding behaviours, which were the main contributor to players’ development of life skills within soccer.  相似文献   

Kinematic and kinetic variability associated with the cable put and seated rotation assessments     

Mike Schofield  Jono Neville  Kim Hébert-Losier  John B. Cronin 《Journal of sports sciences》2020,38(6):597-606

ABSTRACT

When new protocols are developed, there is a requirement to investigate test–retest reliability of measures for valid use and interpretation of data in research and practice. Therefore, the aim of this investigation was to determine the inter-day reliability of the cable put and seated rotation assessment protocols. On three occasions, nine resistance-trained men performed cable puts and cable rotations at different loads between 6 and 42 kg on a commercially available cable cross over machine. Load stack movement was recorded using a PT5A linear position transducer from which all kinematic and kinetic variables were calculated. Reliability was excellent for peak velocity and displacement based on intraclass correlation coefficient (ICC) and coefficient of variation (CV) across the majority of loads and movements (cable put: ICC = 0.92 to 0.99, CV = 3.1% to 8.6%; cable seated rotation: ICC = 0.76 to 0.99, CV = ?1.7% to 16.1%). However, kinetic variables demonstrated inadequate reliability across the majority of days, loads and movements (ICC = 0.70, CV >10%). It was concluded that peak velocity is a reliable kinematic measure to assess muscular capability from cable put and seated rotation protocols; however, kinetic measures are too variable to provide reliable outputs across testing occasions.  相似文献   

Have we underestimated the kinematic and kinetic benefits of non-ballistic motion?     

Frost DM  Cronin JB  Newton RU 《Sports biomechanics / International Society of Biomechanics in Sports》2008,7(3):372-385

Explosive upper-body movements, with which the load is not thrown (non-ballistic), may comprise a phase during which forces are produced in opposition to the motion of the load. Thirty men completed three test sessions (free weight, ballistic, and pneumatic), each consisting of a one-repetition maximum (1-RM) and four explosive repetitions of a bench press at six loads (15, 30, 45, 60, 75, and 90% 1-RM). The end of the lifting phase for the non-ballistic conditions (free weight and pneumatic) was defined by: the point of peak barbell displacement and the point at which the vertical force became negative (positive work). When analysed by peak displacement, the ballistic condition elicited significantly greater mean velocity, force, and power at loads of 15-60% 1-RM compared with the free weight condition. When the period of negative work was removed, the mean free weight velocity, force, and power at loads below 60% 1-RM increased. Consequently, the only differences between the free weight and ballistic conditions were found at loads of 15% and 30% 1-RM. Including a period of negative work may underestimate all kinematic and kinetic variables dependent on the time to, or position of, the end of the lifting phase, for non-ballistic efforts.  相似文献   

Effects of weighted vests and sled towing on sprint kinematics     

John Cronin        Peter Mcnair 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(2):160-172

In this study, we compared sprint kinematics of sled towing and vest sprinting with the same relative loads. Twenty athletes performed 30-m sprints in three different conditions: (a) un-resisted, (b) sled towing, and (c) vest sprinting. During sled towing and vest sprinting, external loads of 15% and 20% of body mass were used. Sprint times were recorded over 10 and 30 m. Sagittal-plane high-speed video data were recorded at 5, 15, and 25 m from the start. Relative to the un-resisted condition, sprint time increased (7.5 to 19.8%) in both resisted conditions, resulting mainly from decreased step length ( ? 5.2 to ? 16.5%) with small decreases in step frequency ( ? 2.7 to ? 6.1%). Sled towing increased stance phase duration (14.7 to 26.0%), trunk angle (12.5 to 71.5%), and knee angle (10.3 to 22.7%), and decreased swing phase duration ( ? 4.8 to ? 15.2%) relative to the un-resisted condition. Vest sprinting increased stance phase duration (12.8 to 24.5%) and decreased swing phase duration ( ? 8.4 to ? 14.4%) and trunk angle ( ? 1.7 to ? 13.0%). There were significant differences between the two resisted conditions in trunk, thigh, and knee angles. We conclude that sled towing and vest sprinting have different effects on some kinematics and hence change the overload experienced by muscle groups.  相似文献   

Effects of a power-focussed resistance training intervention on backward grinding performance in America's Cup sailing     

Simon N. Pearson  John B. Cronin  Patria A. Hume  David Slyfield 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(4):334-344

This study determined whether backward grinding performance in America's Cup sailing could be improved using a training intervention to increase power capability in the upper-body pull movement. Fourteen elite male sailors (34.9 ± 5.9 years; 98.1 ± 14.4 kg; 186.6 ± 7.7 cm) were allocated into experimental (speed-focussed) and control groups. Grinding performance was assessed using a grinding ergometer and an instrumented Smith machine measured force, velocity and power during the bench pull exercise. Conventional training produced significant improvements in bench pull 1 RM (5.2 ± 4.0%; p = 0.016) and maximum force production (5.4 ± 4.0%; p = 0.014). Speed-focussed training improved maximum power (7.8 ± 4.9%; p = 0.009), power at 1RM (10.3 ± 8.9%; p = 0.019) and maximum velocity (8.4 ± 2.6%; p = 0.0002). Backward grinding performance showed greater improvements in the experimental group than the control group for moderate (+1.8%) and heavy load (+6.0%) grinding. Changes in maximum power output and power at 1 RM had large correlations (r = 0.56–0.61) with changes in both moderate and heavy load grinding performance. Time to peak force had the strongest relationship, explaining 70% of the change in heavy load grinding performance. Although the performance benefit was not entirely clear the likelihood of a detrimental effect was low ( < 5%) and therefore implementation could be recommended.  相似文献