Sand training: a review of current research and practical applications

Abstract

Sand surfaces can offer a higher energy cost (EC) and lower impact training stimulus compared with firmer and more traditional team sport training venues such as grass. This review aims to summarise the existing research on sand training, with a specific focus on its application as a team sports training venue. Compared with grass, significant physiological and biomechanical differences are associated with sand exercise. However, evidence also exists to suggest that training adaptations unique to sand can positively influence firm-ground performance. Furthermore, the lower impact forces experienced on sand can limit muscle damage, muscle soreness, and decrements in performance capacity relative to exercise intensity. Therefore, using a sand training surface in team sports may allow greater training adaptations to be achieved, while reducing performance decrements and injuries that may arise from heavy training. Nevertheless, further research should investigate the effect of sand surfaces over a greater range of training types and performance outcomes, to increase the application of sand training for team sports.     

The Association of Objectively Determined Physical Activity Behavior Among Adolescent Female Friends

The purpose of this study was to examine the extent to which physical activity among adolescent female friends is interdependent. The participants were 318 adolescent girls with a mean age of 16.0 years (range: 15–18 years). Pedometry was used to assess physical activity over 4 days. The relationship between an individual girl and her first-nominated reciprocal friend's physical activity level was moderate (r = 0.45, 90% confidence interval = 0.31, 0.56), when the friendship was nonreciprocal it was trivial (r = -.06, 90% confidence interval = -.36. .25). Friends' physical activity levels explained between 27% and 32% of an individual's pedometer-determined physical activity level. Reciprocity of friendship is an important variable to consider when understanding the relationship between adolescent female friends' physical activity. When friendships are reciprocal, there is a stronger relationship between friends' physical activity.     

Identification of Accelerometer Nonwear Time and Sedentary Behavior

Abstract

This study was designed to investigate the swimming endurance trainability of smokers as compared to nonsmokers. Nonsmokers (N = 47) and smokers (N = 34) of college age were selected from intermediate swimming classes and timed while swimming distances of 100 yd. and 200 yd. prior to participation in an 8-week training program. After 4 weeks of training, swimming times were again recorded for these same distances. At the end of eight weeks, swimming times were taken for distances of 100, 200, and 400 yards. The mean changes of both smokers and nonsmokers during the pretraining to 4-week period, the 4-week to 8-week period, and the pretraining to 8-week period were all significant at the .05 level. However, no significant differences were found between the mean swimming times of smokers and nonsmokers for any of the pretraining, 4-week, or 8-week distances.     

The conservative backlash argument controverted: carnivalesque,comedy, and respect in Rocky

The 1976 film Rocky is not the catalyst for conservative backlash that scholars of American cinema and culture have long made it out to be. Through detailed analysis this essay reveals two counterposed dramas: an epic race rivalry conceived by Creed, and a low mimetic comedy that sees Balboa integrated in his local community. The epic dissolves in carnivalesque play and gives way to the earnest local drama of building relationships. Rocky embodies some progressive ideals for race and class under the general theme of respect; it also manifests the men’s liberation movement against the classical male machine. As a pivotal film for critical conceptions of US cinema and culture after 1975, my reappraisal of Rocky challenges ideological criticism’s prevailing paradigm.     

Child-related cognitions and affective functioning of physically abusive and comparison parents

OBJECTIVE: The goal of this research was to utilize the cognitive behavioral model of abusive parenting to select and examine risk factors to illuminate the unique and combined influences of social cognitive and affective variables in predicting abuse group membership. METHODOLOGY: Participants included physically abusive parents (n=56) and a closely-matched group of comparison parents (n=62). Social cognitive risk variables measured were (a) parent's expectations for children's abilities and maturity, (b) parental attributions of intentionality of child misbehavior, and (c) parents' perceptions of their children's adjustment. Affective risk variables included (a) psychopathology and (b) parenting stress. A series of logistic regression models were constructed to test the individual, combined, and interactive effects of risk variables on abuse group membership. RESULTS: The full set of five risk variables was predictive of abuse status; however, not all variables were predictive when considered individually and interactions did not contribute significantly to prediction. A risk composite score computed for each parent based on the five risk variables significantly predicted abuse status. Wide individual differences in risk across the five variables were apparent within the sample of abusive parents. CONCLUSIONS: Findings were generally consistent with a cognitive behavioral model of abuse, with cognitive variables being more salient in predicting abuse status than affective factors. Results point to the importance of considering diversity in characteristics of abusive parents.     

Establishing a forget cue in pigeons using the intratrial interference procedure

Pigeons were trained in an intratrial interference preparation in which a horizontal or vertical line was presented for 1 sec immediately following termination of a sample (red or green). Two samples were presented successively on interference trials. Choice of the comparison corresponding to the second (target) sample was designated correct and was reinforced, and choice of the comparison corresponding to the first (interfering) sample was designated incorrect and was not reinforced. Control trials involved the presentation of a single, target sample. A horizontal line was presented upon termination of an interfering sample, and a vertical line was presented upon termination of a target sample. The results of three experiments led to the conclusion that the horizontal line acquired and capacity to reduce postperceptual processing (rehearsal) of information derived from an immediately preceding sample stimulus. These findings include (1) convergence of accuracy on control and interference trials as training progressed, (2) a reduction in accuracy on control and especially on interference trials when the correlation between sample type (interfering or target) and cue type (horizontal or vertical) was reduced to zero, (3) higher accuracy (i.e., less interference) when the horizontal rather than the vertical line followed the interfering sample, and (4) higher accuracy on single-sample trials when the vertical rather than the horizontal line followed sample presentation.     

University‐Industry Research Partnerships in Australia: Extent,benefits and risks

While official reviews have concluded that Commonwealth Government programs to encourage university - industry research links have been largely successful, studies are needed to explore the extent and nature of such partnerships, and their effects within universities. Further, sections of the academic community and major media warn that industry links and university commercialisation efforts threaten traditional research and scientific values, and accepted norms of academic life including academic freedom. Survey data reported in the paper show that, on balance, industry - research links are working reasonably well for Australian science and technology academics. Some 36.7% of respondents in our sample drawn from three major Australian universities received industry research support and this group tended to be better qualified, more senior and more productive in research than academics without such partnerships. Respondents generally were well aware of both the benefits and risks of industry funding. On the positive side, respondents identified the main benefits as the provision of additional resources, support and enhanced career opportunities for students, opportunities to apply basic research results to industrial problems, less red tape than with government funding, and enhanced university prestige. On the negative side, respondents were concerned about threats to research autonomy, undesirable consequences associated with the commercialisation of knowledge, the low intellectual level of some contract work, reduced time of talented researchers available for teaching, and pressures on researchers to spend increased time on commercial activities.     

Predicting Web 2.0 use among US teens—Expanding the power of the skill,will and tool model

There is a need to understand antecedents to US teens’ use of information and communication technology (ICT). Research on the “digital divide” for access to ICT reports conflicting findings based on gender and demographic factors of parent income and education. This study expanded the “tool-will-skill” framework to examine how demographic factors, access to ICT tools, teen will factors and social networking skill explain variation in Internet use among US teens. The study analyzed national data from Pew Research Center’s survey of 1,060 US teens. Principal component analysis (PCA) identified six latent variables for teen will. A pre-diagram depicts a conceptual framework and causal assumption of relationships between demographic factors, tool factors (ie, Internet access, smartphone access and tablet access), will factors (from PCA) and skill factors (Facebook, Instagram, Snapchat and Twitter). Multiple linear path analysis was conducted, and results reported. Recommendations are suggested for instructional practice, educational policy and future research.     

Neurological models of cognitive processing

A framework is proposed from which to evaluate contemporary neurological models of cognitive processing. Selected models are classified as unidimensional, bidimensional, or tridimensional according to the neuraxes that they address. The empirical research that supports each model is considered in terms of anatomical, physiological, and behavioral levels of analysis. Applied implications of the models for learning and individual differences are identified as they relate to psychoeducational assessment and intervention. Finally, differences and similarities among the selected models are synthesized.