The effects of different doses of caffeine on endurance cycling time trial performance

This study investigated the effects of two different doses of caffeine on endurance cycle time trial performance in male athletes. Using a randomised, placebo-controlled, double-blind crossover study design, sixteen well-trained and familiarised male cyclists (Mean ± s: Age = 32.6 ± 8.3 years; Body mass = 78.5 ± 6.0 kg; Height = 180.9 ± 5.5 cm VO2(peak) = 60.4 ± 4.1 ml x kg(-1) x min(-1)) completed three experimental trials, following training and dietary standardisation. Participants ingested either a placebo, or 3 or 6 mg x kg(-1) body mass of caffeine 90 min prior to completing a set amount of work equivalent to 75% of peak sustainable power output for 60 min. Exercise performance was significantly (P < 0.05) improved with both caffeine treatments as compared to placebo (4.2% with 3 mg x kg(-1) body mass and 2.9% with 6 mg x kg(-1) body mass). The difference between the two caffeine doses was not statistically significant (P = 0.24). Caffeine ingestion at either dose resulted in significantly higher heart rate values than the placebo conditions (P < 0.05), but no statistically significant treatment effects in ratings of perceived exertion (RPE) were observed (P = 0.39). A caffeine dose of 3 mg x kg(-1) body mass appears to improve cycling performance in well-trained and familiarised athletes. Doubling the dose to 6 mg x kg(-1) body mass does not confer any additional improvements in performance.     

Big TAM in Oman: Exploring the promise of on-line banking,its adoption by customers and the challenges of banking in Oman

Information and communication technology (ICT) developments and trends in recent years have had great impact on the banking sector worldwide. In many developed and developing countries, the use of disruptive innovation technologies has accelerated change in the way banking business is conducted, consumers being swept along with such change. However, in many countries, such as Oman, there are deep routed cultural and religious factors that cause consumers to question the acceptance of such changes. Through the use of a theoretical framework built on technology acceptance frameworks and models, and empirical evidence from key market segments of the Omani banking market, the research explores the factors that influence Omani consumer acceptance of on-line banking. The findings are significant in that trust, usability and perceived quality are deemed key drivers. This is probably not unexpected, however, what is interesting is that the market profile is skewed to middle aged users, with social standing and “herd” mentality does not affect the adoption of the technology. This, combined with the emerging mobile savvy younger generation poses an interesting challenge for the future of the banking sector in Oman and implies a need for the sector to rethink the strategic use of, and approach to, implementation of on-line banking in a way that is complementary to the cultural and ethological dimension of the market. In effect, the banking sector will need to manage the covert tension between technology driving “fast time”, and the Omani culture, religion and tradition demanding face to face “slow time”.     

The Canada Research Chairs Program: the good,the bad,and the ugly

Drawing on 60 qualitative interviews with Canada research chairs (CRCs), we explore their careers in context. We develop a model to understand the intersection of individual and institutional factors that shape the everyday experiences of the CRCs. The model shows the dialectical relationship between faculty identity, research, relations with colleagues and students, and institutional practices and structures. We classify individuals’ experiences as “good,” “bad,” or “ugly.” The interviews show that while a majority of CRCs have a positive experience, others have a negative experience that is prone to becoming ugly when institutional practices and systemic factors impede the work of the CRC. We discuss the perceived problems with the CRC program from the standpoint of Chairholders, and the implications of our findings for the CRC program and universities. As well, we propose that additional research on the professoriate is needed to determine whether or not the model from our study is generalizable beyond our sample.     

The use of structuration theory to conceptualize alternative practice in education: the case of private school outreach in India

This paper contributes to arguments for the potential of Giddens’ structuration theory in educational research. It illustrates how ‘conceptual schemes’ from structuration theory were applied to the author’s empirical research on a type of alternative educational practice in India, ‘private school outreach’. It shows how Giddens’ concepts of ‘social system’, ‘structure’ and ‘agency’ helped to conceptualize private school outreach, and how ‘constraint’ and ‘ontological security’ offered explanations of apparent contradictions in private school outreach practice within the context of the reasons and motivations of actors. It also argues that when schools attempt to do things differently, contradictions may occur because the same ‘rules and resources’ that are drawn on in the production of alternative practice are drawn on in the reproduction of practice. Finally, acknowledging the debates around structuration theory, some of its key criticisms are addressed in relation to the empirical application.     

"What does this mean?" How Web-based consumer health information fails to support information seeking in the pursuit of informed consent for screening test decisions.

PURPOSE: The authors analyzed online consumer health information related to screening tests to see how well this information meets known standards for supporting the understanding of test uncertainty. SETTING/SUBJECTS: MedlinePlus documents regarding maternal serum screening (6), prostate-specific antigen testing (6), and screening mammography (6) were analyzed. METHODOLOGY: The content of the documents was analyzed. RESULTS: This study showed that most sites conscientiously report that tests are less than 100% accurate, but few provide important details about the level of uncertainty associated with test results. In particular, few resources give information about the predictive value of screening tests and have little mention of the fact that predictive value is influenced by the a priori likelihood of having the condition. DISCUSSION/CONCLUSION: These results suggest that online consumer health information does not adequately support decisions about medical screening. We suggest a potential solution to the problem: metadata harvesting coupled with optimized presentation techniques to format personalized information about screening tests. Using these techniques, the empowerment of personal choice in matters of health decisions could become the de facto standard.     

Assessing rugby place kick performance from initial ball flight kinematics: development,validation and application of a new measure

The appropriate determination of performance outcome is critical when appraising a performer’s technique. Previous studies of rugby place kicking technique have typically assessed performance based on ball velocity, but this is not the sole requirement. Therefore, a mathematical model of rugby place kick ball flight was developed to yield a single measure more representative of true performance. The model, which requires only initial ball flight kinematics, was calibrated and validated using empirical place kick data, and found to predict ball position with a mean error of 4.0% after 22 m of ball flight. The model was then applied to the performances of 33 place kickers. The predicted maximum distance, a single performance measure which accounted for initial ball velocity magnitude and direction, and spin, was determined using the model and was compared against ball velocity magnitude. A moderate association in the rank-order of the kicks between these two measures (ρ = 0.52) revealed that the relative success of the kicks would be assessed differently with each measure. The developed model provides a representative measure of place kick performance that is understandable for coaches, and can be used to predict changes in performance outcome under different ball launch or environmental conditions.     

Mixed-methods pre-match cooling improves simulated soccer performance in the heat

This investigation examined the effects of three pre-match and half-time cooling manoeuvres on physical performance and associated physiological and perceptual responses in eight University soccer players during a non-motorised treadmill based individualised soccer-specific simulation [intermittent soccer performance test (iSPT)] at 30°C. Four randomised experimental trials were completed; following 30-min (pre-match) and 15-min (half-time) cooling manoeuvres via (1) ice slurry ingestion (SLURRY); (2) ice-packs placed on the quadriceps and hamstrings (PACKS); (3) mixed-methods (MM; PACKS and SLURRY concurrently); or no-cooling (CON). In iSPT first half, a moderate increase in total (Mean?±?Standard Deviation: 108?±?57 m, qualitative inference: most likely, Cohen’s d: 0.87, 90%CL: ±0.31), high-speed (56?±?46 m, very likely, 0.68?±?0.38) and variable run (15?±?5 m, very likely, 0.81?±?0.47) distance covered was reported in MM compared with CON. Additionally, pre-match reductions in thermal sensation (–1.0?±?0.5, most likely, –0.91?±?0.36), rectal (–0.6?±?0.1°C, very likely, –0.86?±?0.35) and skin temperature (–1.1?±?0.3°C, very likely, –0.88?±?0.42) continued throughout iSPT first half. Physical performance during iSPT first half was unaltered in SLURRY and PACKS compared to CON. Rectal temperature was moderately increased in SLURRY at 45-min (0.2?±?0.1°C, very likely, 0.67?±?0.36). Condition did not influence any measure in iSPT second half compared to CON. Only MM pre-match cooling augmented physical performance during iSPT first half, likely due to peripheral and central thermoregulatory factors favourably influencing first half iSPT performance. Further practical half-time cooling manoeuvres which enhance second half performance are still required.     

Perinatal Nurses Respond to Shared Decision-Making Education: A Quasi-Experimental Study

Women describe a loss of autonomy during childbirth as a contributing factor to labor dissatisfaction. Shared decision-making with choice, option, and decision talk may improve satisfaction. Nurses (n = 29) received education on supporting women''s autonomy with a standardized communication tool (SUPPORT) to facilitate shared decision-making and create an evolving birth plan. This quasi-experimental pre-/post-test design evaluated participant responses to the education module. Participants supported the use of the SUPPORT tool for shared decision-making and developing evolving birth plans. Most recommended initiation between 13- and 26-weeks'' gestation. Nurses'' willingness to advocate for women''s autonomy increased significantly after education (p = .022). Shared decision-making with standardized perinatal communication may support a woman''s perinatal education and her satisfaction with labor.     

The physical demands of elite English rugby union

The aim of this study was to assess the physical demands of elite English rugby union match-play. Player movements were captured by five distributed video cameras and then reconstructed on a two-dimensional plane representing the pitch. Movements based on speeds were categorized as standing, walking, jogging, and medium-intensity running (low-intensity activity), and high-intensity running, sprinting, and static exertion (scrummaging, rucking, mauling, and tackling) (high-intensity activity). Position groups were defined as forwards (tight and loose) and backs (inside and outside). Backs travelled more total distance than forwards (6127 m, s=724 vs. 5581 m, s=692; P<0.05) and greater distances in walking (2351 m, s=287 vs. 1928 m, s=2342; P<0.001) and high-intensity running (448 m, s=149 vs. 298 m, s=107; P<0.05). Forwards performed more high-intensity activity than backs (9:09 min:s, s=1:39 vs. 3:04 min:s, s=1:01; P<0.001), which was attributable to more time spent in static exertion (7:56 min:s, s=1:56 vs. 1:18 min:s, s=0:30; P<0.001), although backs spent more time in high-intensity running (0:52 min:s, s=0:19 vs. 1:19 min:s, s=0:26; P=0.004). Players travelled a greater distance in the first 10 min compared with 50-60 and 70-80 min, but there was no difference in the amount of high-intensity activity performed during consecutive 10-min periods during match-play. These results show the differing physical demands between forwards and backs with no evident deterioration in high-intensity activity performed during match-play.     

Inspiratory Muscle Training in Patients with Chronic Obstructive Pulmonary Disease: The State of the Evidence

Purpose: The purpose of the present review was to assess the quality of evidence in the literature regarding the specific benefits of inspiratory muscle training (IMT) with an emphasis on training intensity and the relationships between changes in inspiratory muscle function and other clinical outcome measures. Methods: Articles were found by searching CINAHL, PubMed, Medline via First Search, and ProQuest databases. Articles used in the review were randomized trials of IMT vs. sham IMT or no intervention, published in English in a peer-reviewed journal, included patients with chronic obstructive pulmonary disease (COPD), and specified the intensity of training. The quality of the studies was evaluated by 2 independent reviewers using the methodological rigor scale described by Medlicott and Harris as well as Sackett''s levels of evidence. Fifteen articles met the inclusion criteria and were used in this review. Results: Consistent improvements in maximal inspiratory pressures (ranging from −11 to −30 cm H₂O) and inspiratory muscle endurance were found. Improvements in dyspnea and health-related quality of life were also observed. Inspiratory muscle training may result in improved exercise tolerance as measured using walking tests. High-intensity IMT resulted in improved training efficiency with respect to inspiratory muscle strength, but evidence of the effect of high-intensity IMT on other clinical outcomes is lacking. Conclusion: Despite research spanning decades, there are numerous limitations in the literature regarding IMT. IMT appears to improve dyspnea, waking test distance, and health-related quality of life in individuals with COPD, but it is not clear whether this improvement is mediated through improved inspiratory muscle strength and endurance. This review discussed several considerations critical to the design of future trials.Key Words: inspiratory muscle training, COPD