An assessment of training volume in professional rugby union and its impact on the incidence, severity, and nature of match and training injuries

A prospective cohort study was used to assess the influence of training volume on injuries sustained by 502 professional rugby union players in England. Training volumes (excluding warm-ups, cool-downs, and recovery sessions), player injuries, and player match exposure times were reported weekly. Higher training volumes (>9.1 hours per week) did not increase the incidence of match or training injuries. However, higher training volumes did increase the severity of match injuries, particularly during the second half, and consequently resulted in a significant increase in the number of days' absence due to match injuries. Although lower-limb injuries were the most common match and training injuries, shoulder dislocations/instabilities resulted in more days' absence during weeks of higher training volumes, but the differences were not significant. The least number of days lost due to injuries occurred during weeks of intermediate training volumes (6.2-9.1 h per week). Training volume was not correlated with final league position. Fitness testing, defence, and rucking and mauling components were identified as being very high- or high-risk training activities. Our results provide evidence of the benefits of modifying the volume and content of rugby union training to reduce the risk associated with injuries to professional players.     

Taekwondo training and fitness in female adolescents

In this study, we determined the specificity of a low frequency taekwondo training programme on physical fitness levels in adolescent females who receive limited physical education instruction (i.e. 2 days per week). Major components of physical fitness assessed were: skeletal muscle fitness (hand grip strength, bent arm hang, standing long jump, and isokinetic strength), flexibility (sit-and-reach test), speed and agility (10 × 5-m shuttle run), and cardiovascular fitness (VO(2max) and 20-m shuttle run). Changes in body composition were also assessed (dual X-ray absorptiometry, DXA). Participants were divided into two groups, a taekwondo training group (n = 21), which trained 50 min a day, 2 days per week for 12 weeks, and a control group (n = 10). Taekwondo training improved isokinetic strength, standing long jump, and sit-and-reach performance. Body fat mass and percent body fat were reduced. No changes in grip strength, bent arm hang time, speed and agility, or cardiorespiratory fitness were observed. Results indicate that low frequency taekwondo training in adolescent females produces beneficial changes in skeletal muscle fitness, flexibility, and body composition in a relatively short period of time. Consequently, this specific type of training can be useful to female adolescents in structured school environments where physical education classes are limited and there is little free time for physical activity.     

医学院校课程整合的经验教训:学生、课程负责人与改革领导者的观点

美国医学院校的课程整合改革方兴未艾.加州大学旧金山分校医学院从2001级新生开始对课程体系进行大幅调整,本研究调查了该校参与改革的不同群体,包括教育改革的领导者、受到直接影响的学生、新建课程的负责人等对课程改革的态度,了解其对课程整合实施一年内的成绩和挑战的看法.结果表明,他们对跨学科教学、跨学科系室协作、课程关联的建立、课程内容的排序及框架构建等四个主题有相同的看法,也有不小的分歧.     

Protection styles of prostitutes' clients: intentions,behavior, and considerations in relation to AIDS

The perceived costs and benefits of condom use within the context of commercial sex were examined in interviews with 87 clients of female Dutch prostitutes. 8 types of condom users were identified: convinced (46% of the study group), guilty conscience (11%), anti-ridden (13%), defaulting (6%), maximum selective (8%), minimum selective (3%), indifferent (8%), and recalcitrant (5%). Clients who consistently used condoms take responsibility for both the pleasure and safety of their sexual encounter; their attitude toward prostitution is positive and straightforward. Guilty conscience users are motivated to use condoms by feelings of guilt toward their wife and are ambivalent about their participation in commercial sex. Angst-ridden users are motivated to seek out prostitutes more by loneliness than the pursuit of sexual pleasure; they view their personal risk of acquired immunodeficiency syndrome (AIDS) as higher than that reported by consistent users and thus are motivated by fear to use condoms. Defaulting users perceive themselves as the victims of temptation and express a lack of control over the sexual encounter that places them at risk of unprotected sex. Maximum selective users are consistent in using condoms in sex with prostitutes, except when it involves a prostitute whom they see regularly and frequently. Minimum selective users seek frequent contact with prostitutes and base condom use on a subjective assessment of whether the woman is healthy or not. Indifferent users, often disabled and lonely men with no other source of sexual contact, base their condom use or nonuse solely on the wishes of the prostitute. Finally, recalcitrant users are characterized by a desire for power and protest condom use. In general, consistent condom use was related to a positive evaluation of prostitutes, positive attitudes toward the advantages of condom use, an internal locus of control with regard to health, and a higher level of education.     

Do students with and without lexical retrieval weaknesses respond differently to instruction?

Deficits in phonological processing are theorized to be responsible for at least some reading disabilities. A considerable amount of research demonstrates that many students can be taught one of these phonological processes-phonemic awareness. However, not all students have responded favorably to this instruction. Research has suggested that these nonresponders may be unable to retrieve phonological codes quickly from long-term memory. The purpose of this study was to examine whether such a deficiency, which we refer to as lexical retrieval weakness, blunts the effectiveness of combined phonemic awareness and decoding training. To this end, we compared the effectiveness of phonemic awareness and decoding training for students with and without severe lexical retrieval weaknesses. All students in both groups demonstrated poor phonemic awareness. The results suggested that students with relatively strong lexical retrieval skill responded more favorably to beginning reading instruction than did students with weak lexical retrieval skill. In other words, lexical retrieval weakness may influence reading development independently of the effects of phonemic awareness. Implications for instruction are discussed.