Heart rate,blood lactate concentration and estimated energy expenditure in a semi-professional rugby league team during a match: a case study     

Coutts A  Reaburn P  Abt G 《Journal of sports sciences》2003,21(2):97-103

The aim of this study was to examine heart rate, blood lactate concentration and estimated energy expenditure during a competitive rugby league match. Seventeen well-trained rugby league players (age, 23.9 +/- 4.1 years; VO2max, 57.9 +/- 3.6 ml x kg(-1) x min(-1); height, 1.82 +/- 0.06 m; body mass, 90.2 +/- 9.6 kg; mean +/- s) participated in the study. Heart rate was recorded continuously throughout the match using Polar Vantage NV recordable heart rate monitors. Blood lactate samples (n = 102) were taken before the match, after the warm-up, at random stoppages in play, at half time and immediately after the match. Estimated energy expenditure during the match was calculated from the heart rate-VO2 relationship determined in laboratory tests. The mean team heart rate (n = 15) was not significantly different between halves (167 +/- 9 vs 165 +/- 11 beats x min(-1)). Mean match intensity was 81.1 +/- 5.8% VO2max. Mean match blood lactate concentration was 7.2 +/- 2.5 mmol x l(-1), with concentrations for the first half (8.4 +/- 1.8 mmol x l(-1)) being significantly higher than those for the second half (5.9 +/- 2.5 mmol x l(-1)) (P<0.05). Energy expenditure was approximately 7.9 MJ. These results demonstrate that semi-professional rugby league is a highly aerobic game with a considerable anaerobic component requiring high lactate tolerance. Training programmes should reflect these demands placed on players during competitive match-play.  相似文献   

Does Interpretive Test Score Information Help Teachers?     

James C. Impara  Katherine P. Divine  Franklin A. Bruce  Milton R. Liverman  Aaron Gay 《Educational Measurement》1991,10(4):16-18

To what extent do teachers possess the competence to interpret state testing program results properly?  相似文献   

Alternatives to keyboarding     

J. Aaron Hoko 《TechTrends》1986,31(5-6):23-24

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Journals at bepress: new twists on an old model     

Irene PERCIALI  Aaron EDLIN 《Learned Publishing》2008,21(2):116-122

In recent years academic journal publishers have explored a variety of new business models. The Berkeley Electronic Press (bepress), founded by professors in 1999, now publishes 39 electronic‐only journals. bepress's own model rests on three principles: improve, but do not break, the traditional journal; allow non‐subscribers to read articles as guests; and offer reasonable and sustainable prices to libraries. This model has resulted in steady growth. Even in the shifting landscape of open access, there remains a place for professional journal publishers who offer innovative improvements, traditionally qualified content, and reasonable prices.  相似文献   

Cognitive Techniques as a Means for Facilitating Supervisee Development     

Aaron Kindsvatter  Darcy Haag Granello  Jill Duba 《Counselor Education & Supervision》2008,47(3):179-192

During periods of uncertainty or psychological distress, a supervisee may encounter or develop rigid or unhelpful thinking patterns that could delay development by promoting discouraging realities and experiences. Such cognitive experiences often are so subtle that they occur outside of the supervisee's immediate awareness. This article explores how the cognitive model of counseling could be used in supervision as a guide to help the supervisor and supervisee discover and modify negative thought processes.  相似文献   

Anatomical Sciences Education Vol. 4, Issue 1, 2011 Cover Image     

April Richardson  Matthew Hazzard  Sandra D. Challman  Aaron M. Morgenstein  Jennifer K. Brueckner 《Anatomical sciences education》2011,4(1)

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Organizational realignment case study: Adding value by analyzing performance     

Aaron U. Bolin 《Performance Improvement》2010,49(6):9-14

The U.S. Navy is a global organization with an annual budget in excess of $140 billion and employs roughly 330, 000 sailors. A multilevel adaptation of the human performance model was applied to look across organizations for functional areas where efficiencies could be gained by standardizing business practices and cooperating across organizational boundaries. The resulting 17‐to‐1 return on investment is attributed to the process of working through the model with a team of executive stakeholders.  相似文献   

Disclosure and secrecy in adolescent-parent relationships   总被引：3，自引：0，他引：3  

Smetana JG  Metzger A  Gettman DC  Campione-Barr N 《Child development》2006,77(1):201-217

Beliefs about parents' legitimate authority and adolescents' obligations to disclose to parents and actual disclosure and secrecy in different domains were examined in 276 ethnically diverse, lower middle-class 9th and 12th graders (Ms=14.62 and 17.40 years) and their parents (n=249). Adolescents were seen as more obligated to disclose prudential issues and less obligated to disclose personal than moral, conventional, and multifaceted issues; parents viewed adolescents as more obligated to disclose to parents than adolescents perceived themselves to be. Adolescents disclosed more to mothers than to fathers, particularly regarding personal issues, but mothers overestimated girls' disclosure. Greater trust, perceived obligations to disclose, and, for personal issues, more parental acceptance and psychological control predicted more disclosure and less secrecy.  相似文献   

Stimulus space complexity determines the ratio of specialist and generalist neurons during pattern recognition     

Aaron Montero  Ramon Huerta  Francisco B. Rodriguez 《Journal of The Franklin Institute》2018,355(5):2951-2977

Neural processing layers built on divergent connectivity patterns display two types of stimulus-dependent responses: neurons that react to a few stimuli, specialists, and other ones that respond to a wide range of inputs, generalists. Specialists are essential for the discrimination of stimuli and generalists extract common and generic properties from them. This neural heterogeneity could have emerged because of animal adaptation to the environment. Thus, we suggest that there is a relationship between the percentage of specialists and generalists and the stimulus complexity. In order to study this possible relationship, we use patterns with different complexities in a bio-inspired neural network and calculate their classification errors for different ratios of these types of neurons. This study shows that, when the complexity of the stimuli is low, the minimum classification error is achieved with almost any specialist-generalist ratio. Thus, in this case, the role of these neurons during pattern recognition is unspecific. When this complexity is intermediate, both are needed to minimize the classification error, usually in a similar proportion. For increasing stimulus complexity, the importance of generalists decreases, until their relevance is fully nullified when the complexity is high. Therefore, if we adjust the specialist-generalist ratio to the complexity of patterns, we can build more effective neural networks for pattern recognition. Finally, we propose an estimation of stimulus complexity based on the proportion of these types of neurons observed by neural recordings. This offers the possibility to evaluate the stimulus complexity to which animals are adapted.  相似文献   

The physical profile of adult male basketball players: Differences between competitive levels and playing positions     

Davide Ferioli  Ermanno Rampinini  Andrea Bosio  Antonio La Torre  Matteo Azzolini  Aaron J. Coutts 《Journal of sports sciences》2018,36(22):2567-2574

This study examined the physical differences in adult male basketball players of different competitive level and playing position using a large cohort. In the middle of the regular season, 129 players from four different Divisions completed a Yo-YoIR1 and, after 3-to-8 days, they performed a 6-min continuous running test (Mognoni’s test), a counter-movement jump (CMJ) test and a 5-min High-intensity Intermittent running test (HIT). Magnitude-based inferences revealed that differences in HIT were very likely moderate between Division I and II and likely small between Division II and III. The differences in absolute peak power and force produced during CMJs between Division I and II and between Division II and III were possibly small. Differences in Yo-YoIR1 and Mognoni’s test were very likely-to-almost certain moderate/large between Division III and VI. We observed possibly-to-likely small differences in HIT and Mognoni’s test between guards and forwards and almost certainly moderate differences in absolute peak power and force during CMJs between guards and centres. The ability to sustain high-intensity intermittent efforts (i.e. HIT) and strength/power characteristics can differentiate between competitive level, while strength/power characteristics discriminate guards from forwards/centres. These findings inform practitioners on the development of identification programs and training activities in basketball.  相似文献