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排序方式： 共有215条查询结果，搜索用时 181 毫秒
41.
Jason M. Avedesian Lawrence W. Judge Henry Wang 《Sports biomechanics / International Society of Biomechanics in Sports》2020,19(5):587-600
ABSTRACT Female volleyball athletes incorporate dynamic and static stretching into a warm-up, with evidence generally supporting dynamic stretching to improve performance. However, the effects of these stretching practices on injury risk during subsequent volleyball manoeuvres have yet to be fully elucidated in the warm-up literature. Three-dimensional kinematic data associated with non-contact, lower extremity injury were recorded on 12 female collegiate club volleyball athletes during unilateral landing tasks on the dominant and non-dominant limb. Participants performed landings as part of a volleyball-simulated manoeuvre prior to and post-dynamic (DWU) and combined dynamic-static (CDS) warm-ups. A significant reduction in non-dominant hip adduction angle was found at 15 min post CDS warm-up (p = 0.016; d = 0.38), however, no other warm-up differences were detected. The non-dominant limb demonstrated greater knee abduction (p = 0.006; d = 0.69) and internal rotation angle (p = 0.004; d = 0.88), suggesting that this limb demonstrates more risky landing patterns that are potentially due to altered trunk positioning upon landing. The results show that the majority of selected landing kinematics are unaffected by additional static stretching to a dynamic warm-up and that the non-dominant limb may be at a higher injury risk in female volleyball athletes. 相似文献
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吕和 《佳木斯教育学院学报》2015,(4):372
充分认识管理会计的本质及其与其他会计类型的区别,对于更好的推进管理会计体系建设,和促进管理会计工作成效的提高有着重要的意义。本文以管理会计的本质属性为依据,对管理会计的横向边界与纵向边界进行了分析,期望为管理会计属性与边界的认识与研究提供新的视角。 相似文献
45.
Yu Zhang Wenhan Huang Limin Ma Zefeng Lin Huayang Huang Hong Xia 《Journal of sports sciences》2017,35(4):402-409
It is commonly believed that a torn ACL or a damaged meniscus may be associated with altered knee joint movements. The purpose of this study was to measure the tibiofemoral kinematics of ACL deficiency with concomitant meniscus deficiency. Unilateral knees of 28 ACL deficient participants were studied while ascending stairs. Among these patients, 6 had isolated ACL injuries (group I), 8 had combined ACL and medial meniscus injuries (group II), 8 had combined ACL and lateral meniscus injuries (group III) and 6 had combined ACL and medial-lateral meniscus injuries (group IV). Both knees were then scanned during a stair climb activity using single fluoroscopic image system. Knee kinematics were measured at 0°, 5°, 10°, 15°, 30° and 60° of flexion during ascending stairs. At 0°, 15° and 30° flexion of the knee, the tibia rotated externally by 13.9 ± 6.1°,13.8 ± 9.5° and 15.9 ± 9.8° in Group I. Group II and III exhibited decreased external rotation from 60° to full extension. Statistical differences were found in 0°, 15°and 30° of flexion for the 2 groups compared with Group I. In general, the tibia showed anterior translation with respect to the femur during ascending stairs. It was further determined that Group III had larger anterior translation compared with Group IV at 0° and 5° of flexion (?6.9 ± 1.7 mm vs. 6.2 ± 11.3 mm, P = 0.041; ?9.0 ± 1.8 mm vs. 8.1 ± 13.4 mm, P = 0.044). During ascending stairs the ACL deficient knee with different deficiencies in the meniscus will show significantly different kinematics compared with that of uninjured contralateral knee. Considering the varying effect of meniscus injuries on knee joint kinematics, future studies should concentrate on specific treatment of patients with combined ACL and meniscus injuries to protect the joint from abnormal kinematics and subsequent postoperative degeneration. 相似文献
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《Journal of sports sciences》2012,30(1):86-93
ABSTRACTThe predictive value of the multiple hop test for first-time noncontact lateral ankle sprains. Background: Lateral ankle sprains (LAS) are very common sports injuries, cause high health care costs and are associated with postural control deficits. From a preventive point of view, clinicians should dispose valid field tests to identify athletes at risk for a LAS. The aim of this study is to evaluate the predictive value of the multiple hop test (MHT) for first-time noncontact LAS. Methods: Non-elite athletes (n = 232) performed the MHT at baseline. During a 12-month follow-up period, all noncontact LAS related to health care costs were recorded. Outcomes of the MHT (completion time, balance errors and perceived difficulty) between the injured and uninjured group were compared and odds ratios (OR) and relative risks (RR) were calculated using a logistic regression analysis. Results: Ten first-time noncontact LAS were recorded (4.3%). Injured athletes made significantly more change-in-support strategy (CSS) errors when compared to uninjured athletes (p = .04). The OR of the number of CSS errors was 1.14 (p = .03), the RR 4.1 (p = .04). Conclusions: Athletes scoring > 12 CSS errors, have a four times increased risk for a first-time noncontact LAS. The MHT is a valid field test to identify athletes at risk for a first-time noncontact LAS. 相似文献
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前交叉韧带的运动损伤是常见的膝关节运动损伤,前人已对该损伤进行了诸多详尽的论述。笔者结合以上研究成果作以浅述,使读者对之形成一个客观系统的认识。 相似文献
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2004年12月26日苏门答腊Mw9.3地震产生的应力扰动，强烈影响了苏门答腊及其周边地区的地震活动性，甚至对中国西南部地区的地震活动性也有明显的影响。基于断层滑动模型，采用等效体力处理断层错动有限单元方法，分别用分层球对称地球模型与三维横向不均匀性地球模型计算在全球地壳和地幔中产生的同震效应。据此，对在苏门答腊和中国西南等地区产生的同震效应进行重点分析。结果表明：在同震破裂面附近，使用三维不均匀性地球模型与使用分层球对称模型得到的结果有明显差别，前者更加合理。在同震破裂面附近有必要使用三维不均匀性地球模型。使用球对称模型计算，有67.6%的余震发生在库仑应力增加区；而使用横向不均匀性地球模型时，计算的这一比率可高达72.3%，这说明余震与断层库仑应力增加区域有很好的对应关系。在西安达曼断层北段余震的发生与库仑应力为正值的主要断层有很好的对应关系，余震受到其附近的主要断层的控制作用。 相似文献
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Abdul Jabbar Khalid Sujae Ian Harris Loke Michael Hamill Joseph Xingda Qu 《Journal of sports sciences》2015,33(13):1322-1331
This study investigated whether neuromuscular fatigue affects the neuromuscular control of an athlete within a sports context setting and whether these effects were more pronounced in the females. Lower limb joint kinetics of 6 male and 6 female inter-varsity soccer players performing side-stepping tasks in non-fatigue versus fatigue and anticipated versus unanticipated conditions were quantified using 10 Motion Analysis Corporation cameras and a Kistler? force platform. The Yo-Yo intermittent recovery Level 1 fatigue protocol was employed. Stance foot initial contact and peak forces, and peak joint knee moments of the lower limb were submitted to a 3-way mixed-model repeated measure ANOVA. The results suggested that males tend to elicit significantly higher knee joint loadings when fatigued. In addition, males elicited significantly higher peak proximal tibia anterior/posterior shear force, vertical ground reaction force at initial contact and peak internal rotational moments than females. These findings suggested that males were at greater overall injury risk than females, especially in the sagittal plane. Neuromuscular control-based training programmes/interventions that are designed to reduce the risk of the non-contact ACL injury need to be customised for the different genders. 相似文献
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