Could knee joint mechanics during the golf swing be contributing to chronic knee injuries in professional golfers?

ABSTRACT

Full three-dimensional movements and external moments in golfers’ knees and the possible involvement in injuries have not been evaluated using motion capture at high sample frequencies. This study measured joint angles and external moments around the three anatomical axes in both knees of 10 professional golfers performing golf drives whilst standing on two force plates in a motion capture laboratory. Significant differences were found in the knee joint moments between the lead and trail limbs for the peak values and throughout all stages during the swing phase. A significantly higher net abduction moment impulse was seen in the trail limb compared with the lead limb (?0.518 vs. ?0.135 Nms.kg^?1), indicating greater loading over the whole swing, which could contribute to knee lateral compartment or anterior cruciate ligament injuries. A significant correlation (r = ?0.85) between clubhead speed at ball contact and maximum joint moment was found, with the largest correlations being found for joint moments at the top of the backswing event and at the end of the follow-through. Therefore, although knee moments can contribute to high clubhead speeds, the large moments and impulses suggest that they may also contribute to chronic knee injuries or exacerbate existing conditions.     

体育舞蹈在高校素质教育中的作用

21世纪是高科技飞跃发展的知识经济社会，人才的竞争日趋激烈。因此推行素质教育是高等学校面向21世纪的重要任务。体育舞蹈是融体育、音乐、舞蹈为一体的新型体育课程，对全面培养大学生综合素质、增强大学生生理、心理健康、发展个性、审美能力的提高具有重要作用。     

Ensuring Content‐Area Learning by Secondary Students with Learning Disabilities

Three factors tied with secondary student success in content‐area reading are demonstrated: (a) validated teacher‐focused and student‐focused interventions, (b) integrated and comprehensive service delivery systems, and (c) well‐designed, data‐based professional developmental programs. Difficult challenges face secondary students with LD and their teachers with regard to these students’ participation and success in required general education classes. Recently, instructional methods and materials have been developed and validated for promoting these students’ success. Some of them focus on how general education teachers plan and teach their content‐area courses; others focus on giving students the strategies they need to respond independently to the demands of their courses. This article describes these instructional methods, a service‐delivery model for implementing these interventions in secondary schools, and professional‐development mechanisms and administrative support that must be in place for the model to be maintained effectively.     

初论举重运动员的重量感

重量感是举重运动员在运动过程中的 1种专门化的运动知觉。从训练和比赛实践中积累的大量资料中列举部分实例来说明重量感在训练和比赛中的典型表现形式 ,着重讨论了重量感的定义、形成过程及主要特征。由于目前举重界对重量感形成的机制、原理尚不清楚 ,在一定程度上影响了选材和训练过程 ,对此问题进行深入的研究和开发十分必要     

The Merging of the PCFC and the UFC: Probable,Desirable or Inevitable?

Post-war growth of higher education has attracted the interest of national governments. They are properly concerned with higher education's contribution to economic success and equity, and the efficient and effective use of public funds. They can intervene by means of legislation (which is unwieldy), exhortation (which is ineffective), or funding incentives. Funding councils must operate within a social and political context which determines the balance between planning and the market, central and local direction, public and private funding. They have only four strategies to choose from: deficiency-, formula-, contract-, and core-funding. The first was nearly fatal; the last is the preferred option for the future.
There are two issues: the merging of the two funding councils (PCFC and UFC), and the ending of the binary system. The first could produce a welcome single guiding intelligence for UK higher education, and economies of scale. The second raises the question of the funding of fundamental research. The merging of PCFC and UFC and the reorganisation of research-funding is a two-headed nettle. It must be grasped soon.     

The effect of limb dominance on lower limb functional performance – a systematic review

Lower limb dominance (or lateral preference) could potentially effect functional performance. Clinicians are often asked to make judgements as to when a patient has sufficiently “recovered” from an injury, typically using strength and dynamic performance outcome measures. The primary purpose of this study was to systematically review the literature in relation to limb dominance within active adult populations and discuss some limitations to current methods and relate this to current clinical practice. A search of MEDLINE and CINAHL and EMBASE databases and reference lists of those articles identified was performed. Eleven articles were selected for meta-analysis. There was no statistical effect of limb dominance for any of the functional tests: isokinetic quadriceps and hamstring tests, hamstring:quadriceps ratios, single-leg hop for distance, single-leg vertical jump and vertical ground reaction force following a single-leg vertical jump. Pooled symmetry values varied from 94.6% to 99.6% across the tests, above the clinically accepted benchmark of 90% used in clinical practice. Although the results of this study must be used with discretion, asymmetries in the tasks described in this analysis should be viewed as undesirable and remedied accordingly. Further research is needed to quantify asymmetries, particularly in relation to sport-specific contexts.