Transfer of motor and perceptual skills from basketball to darts

The quiet eye is a perceptual skill associated with expertise and superior performance; however, little is known about the transfer of quiet eye across domains. We attempted to replicate previous skill-based differences in quiet eye and investigated whether transfer of motor and perceptual skills occurs between similar tasks. Throwing accuracy and quiet eye duration for skilled and less-skilled basketball players were examined in basketball free throw shooting and the transfer task of dart throwing. Skilled basketball players showed significantly higher throwing accuracy and longer quiet eye duration in the basketball free throw task compared to their less-skilled counterparts. Further, skilled basketball players showed positive transfer from basketball to dart throwing in accuracy but not in quiet eye duration. Our results raise interesting questions regarding the measurement of transfer between skills

Review article: How does glacier discharge affect marine biogeochemistry and primary production in the Arctic?

Freshwater discharge from glaciers is increasing across the Arctic in response to anthropogenic climate change, which raises questions about the potential downstream effects in the marine environment. Whilst a combination of long-term monitoring programmes and intensive Arctic field campaigns have improved our knowledge of glacier-ocean interactions in recent years, especially with respect to fjord/ocean circulation, there are extensive knowledge gaps concerning how glaciers affect marine biogeochemistry and productivity. Following two cross-cutting disciplinary International Arctic Science Committee (IASC) workshops addressing the importance of glaciers for the marine ecosystem, here we review the state of the art concerning how freshwater discharge affects the marine environment with a specific focus on marine biogeochemistry and biological productivity. Using a series of Arctic case studies (Nuup Kangerlua/Godthäbsfjord, Kongsfjorden, Kangerluarsuup Sermia/Bowdoin Fjord, Young Sound and Sermilik Fjord), the interconnected effects of freshwater discharge on fjord-shelf exchange, nutrient availability, the carbonate system, the carbon cycle and the microbial food web are investigated. Key findings are that whether the effect of glacier discharge on marine primary production is positive or negative is highly dependent on a combination of factors. These include glacier type (marine- or land-terminating), fjord-glacier geometry and the limiting resource(s) for phytoplankton growth in a specific spatio-temporal region (light, macronutrients or micronutrients). Arctic glacier fjords therefore often exhibit distinct discharge-productivity relationships, and multiple case-studies must be considered in order to understand the net effects of glacier discharge on Arctic marine ecosystems

Review Article: How does glacier discharge affect marine biogeochemistry and primary production in the Arctic?

Freshwater discharge from glaciers is increasing across the Arctic in response to anthropogenic climate change, which raises questions about the potential downstream effects in the marine environment. Whilst a combination of long-term monitoring programmes and intensive Arctic field campaigns have improved our knowledge of glacier–ocean interactions in recent years, especially with respect to fjord/ocean circulation, there are extensive knowledge gaps concerning how glaciers affect marine biogeochemistry and productivity. Following two cross-cutting disciplinary International Arctic Science Committee (IASC) workshops addressing the importance of glaciers for the marine ecosystem, here we review the state of the art concerning how freshwater discharge affects the marine environment with a specific focus on marine biogeochemistry and biological productivity. Using a series of Arctic case studies (Nuup Kangerlua/Godthåbsfjord, Kongsfjorden, Kangerluarsuup Sermia/Bowdoin Fjord, Young Sound and Sermilik Fjord), the interconnected effects of freshwater discharge on fjord–shelf exchange, nutrient availability, the carbonate system, the carbon cycle and the microbial food web are investigated. Key findings are that whether the effect of glacier discharge on marine primary production is positive or negative is highly dependent on a combination of factors. These include glacier type (marine- or land-terminating), fjord–glacier geometry and the limiting resource(s) for phytoplankton growth in a specific spatio-temporal region (light, macronutrients or micronutrients). Arctic glacier fjords therefore often exhibit distinct discharge–productivity relationships, and multiple case-studies must be considered in order to understand the net effects of glacier discharge on Arctic marine ecosystems

CREATINE SUPPLEMENTATION AND SWIM PERFORMANCE: A BRIEF REVIEW

Nutritional supplements are popular among athletes participating in a wide variety of sports. Creatine is one of the most commonly used dietary supplements, as it has been shown to be beneficial in improving performance during repeated bouts of high-intensity anaerobic activity. This review examines the specific effects of creatine supplementation on swimming performance, and considers the effects of creatine supplementation on various measures of power development in this population. Research performed on the effect of creatine supplementation on swimming performance indicates that whilst creatine supplementation is ineffective in improving performance during a single sprint swim, dietary creatine supplementation may benefit repeated interval swim set performance. Considering the relationship between sprint swimming performance and measurements of power, the effect of creatine supplementation on power development in swimmers has also been examined. When measured on a swim bench ergometer, power development does show some improvement following a creatine supplementation regime. How this improvement in power output transfers to performance in the pool is uncertain. Although some evidence exists to suggest a gender effect on the performance improvements seen in swimmers following creatine supplementation, the majority of research indicates that male and female swimmers respond equally to supplementation. A major limitation to previous research is the lack of consideration given to the possible stroke dependant effect of creatine supplementation on swimming performance. The majority of the research conducted to date has involved examination of the freestyle swimming stroke only. The potential for performance improvements in the breaststroke and butterfly swimming strokes is discussed, with regards to the biomechanical differences and differences in efficiency between these strokes and freestyl

Sibling dynamics and sport expertise

Family members are known to be highly influential in the development of sport expertise. To date, much of the research in this area has focused on parents, with less known about sibling influences on expertise. This investigation explored associations between sport expertise, sibling characteristics, and sibling participation in sport and physical activity. Athletes representing three skill levels provided details of sibling characteristics and participation in sport and physical activity via the Developmental History of Athletes Questionnaire. Elite athletes were more likely to be later-born children, while pre-elite and non-elite athletes were more likely to be first-born. Compared with siblings of non-elite athletes, siblings of elite athletes were more likely to have participated in regular physical activity and were more likely to have participated in sport at the pre-elite and elite levels. These results suggest siblings may play a key role in sport expertise development

Designing the DHAQ: construction and validation of the developmental history of athletes questionnaire

Knowledge of the training requirements and environmental factors associated with expert sports performance is essential for the design of effective sport programs and the creation of nurturing practice environments. Current research in this area is dominated by a) the use of qualitative analysis techniques characterized by small samples of homogenous participants, and b) the use of basic training history questionnaires that do not account for the contribution of contextual factors to the development of expertise. The Developmental History of Athletes Questionnaire (DHAQ) was designed for collection of detailed developmental histories from larger samples of athletes than have previously been investigated. To establish the validity and reliability of the questionnaire, fifteen Australian national level athletes completed the DHAQ on two occasions and participated in a semi-structured interview. Information from parents and coaches was also collected to substantiate athlete data. Preliminary analyses support the DHAQ as a reliable measurement tool

Following in their footsteps? Sport expertise and parental participation in sport and physical activity

The family has been identified as a critical influence on sport expertise development, with much of the research in this area focusing on the provision of resources and the changing roles of the family throughout athletes' careers. Although associations between parent's and children's participation in physical activity have been explored, little is known about the associations between parent participation in sport and physical activity and the development of sport expertise. As part of a larger investigation of sport expertise development, patterns of participation in sport and physical activity were examined for the parents of 229 athletes from Australia and Canada (mean age = 23.28 &#0177; 4.79) via completion of the Developmental History of Athletes Questionnaire. Athletes represented 36 different sports and three skill levels - non elite, pre elite, and elite. Pearson chi-square tests for independence revealed significant associations between skill level and parental involvement in general fitness activities, recreational sport, and competitive sport, with parents of elite athletes participating in these activities more regularly than parents of non elite athletes. Specifically, involvement of the mother in general fitness activities and recreational sport, and involvement of the father in competitive sport were most strongly associated with athlete skill level. Additionally, parents of elite athletes were also more likely to have competed at the elite levels of competition themselves (&#0207; &#8225; 2(6) = 17.04, p < .01), but not necessarily in the same sport as their child. These results support previous research highlighting the importance of the family for the development of sport expertise, and extend current knowledge in this area by suggesting that parent modelling of physical activity behaviours and parent participation in high performance sport may influence athlete development

Does visual-perceptual training augment the fielding performance of skilled cricketers?

This study examined the effectiveness of visual-perceptual training for improving fielding performance in cricket. Twelve highly-skilled cricket players completed a video-based decision-making test and an in-situ fielding test before and after a six-week training intervention. During this period, all participants completed the same on-field training program, but seven players completed three additional perceptual training sessions per week (TRAIN). The remaining five players acted as a control (CON). Despite no group differences at pre-test, TRAIN scored significantly higher than CON at post-test for decision accuracy within the video-based test. For the in-situ fielding test, TRAIN demonstrated greater improvements in fielding success following the intervention compared to CON. The results indicate that six weeks of on-field training combined with visual-perceptual training can lead to improvements in the fielding performance of skilled cricketers above those of on-field training alone. Findings are discussed from empirical and applied coaching perspectives