排序方式： 共有47条查询结果，搜索用时 234 毫秒
11.
不同负荷游泳训练对大鼠大脑大锥体细胞及小脑蒲肯野细胞树突棘影响的实验研究 总被引：4，自引：0，他引：4
对大鼠进行8周的循环流动水游泳训练建立大鼠一般负荷训练模型及过度负荷训练模型,利用高倍显微镜测量皮质躯体运动区Ⅴ层大锥体细胞及小脑皮质蒲肯野细胞的树突棘密度变化的情况,结果表明,训练组(一般负荷组与过度负荷组)树突棘密度都显著性高于对照组。说明长期的运动训练对大脑皮层形态结构可能产生良好的影响,提高大脑对信息的处理能力。 相似文献
12.
不同类型太极拳运动对人体脊柱的影响之探讨 总被引：3，自引：0，他引：3
通过Qualisys红外光测量方法对吴式、杨式、陈式太极拳的演练过程进行拍摄分析,比较各种类型太极拳运动对脊柱的影响,对脊柱弯曲情况进行曲线拟和;并比较出不同类型太极拳运动头、膝、髋等部位的运动的特征. 相似文献
13.
目的:探讨颈前入路C2-3椎体螺钉钢板内固定融合术治疗Hangman骨折的方法、临床效果和安全性.方法:9例Hangman骨折经颅骨牵引复位后,在仰卧位采取右侧颌下斜切口,在颈动脉鞘和内脏鞘之间进入椎前间隙,切除C2-3椎间盘,取自体髂骨移植,枢法模带锁钢板螺钉内固定.术后费城颈托外固定6～8周.术后所有患者随访6～30月,平均18个月.结果:本组9例病例均获得骨性融合,无假关节形成,颈部活动度正常,无神经功能受损症状.结论:经颈前入路C2-3椎体螺钉钢板内固定融合术治疗Hangman骨折可获得良好的即时稳定性,防止假关节形成和鹅颈畸形,有利于患者早期下床活动,且不影响颈椎活动度,是一种安全、效果良好的治疗方法. 相似文献
14.
AbstractThe purpose of this study was to determine the influence of lumbar spine extension and erector spinae muscle activation on vertical jump height during maximal squat jumping. Eight male athletes performed maximal squat jumps. Electromyograms of the erector spinae were recorded during these jumps. A simulation model of the musculoskeletal system was used to simulate maximal squat jumping with and without spine extension. The effect on vertical jump height of changing erector spinae strength was also tested through the simulated jumps. Concerning the participant jumps, the kinematics indicated a spine extension and erector spinae activation. Concerning the simulated jumps, vertical jump height was about 5.4 cm lower during squat jump without trunk extension compared to squat jump. These results were explained by greater total muscle work during squat jump, more especially by the erector spinae work (+119.5 J). The erector spinae may contribute to spine extension during maximal squat jumping. The simulated jumps confirmed this hypothesis showing that vertical jumping was decreased if this muscle was not taken into consideration in the model. Therefore it is concluded that the erector spinae should be considered as a trunk extensor, which enables to enhance total muscle work and consequently vertical jump height. 相似文献
15.
16.
摘要：目的：通过太极拳云手技术对脊柱曲度影响的实证研究，探索太极拳形态的核心技术变化规律。方法：采用实验方法对高水平太极拳组和普通组进行对比研究。结果：高水平太极拳组，在太极拳云手动作的脊柱变化是脊柱胸腰段曲度在胸椎1～7节上没有明显变化，而从第8～12胸椎，包括全部的5节腰椎，整体上都存在比较大的后凸趋势，且呈现出逐节递增的变化特征。结论：1）太极拳形的核心要素是脊柱的生理弯曲减小，由“S”型变化“C”型，形成近似“中直”的轴形。太极拳运动能够对人体脊柱的曲度和活动度起到很大的锻炼功效，有长期太极拳练习经历的人群，在对脊柱曲度变化的调节和控制能力上要明显优于短时间或无太极拳练习基础的人。2）受传统“中庸思想”影响和太极拳攻防化劲发力要求形成了太极拳形的“中直”脊柱形态变化。3）脊柱生理弯曲改变，使脊柱椎间盘受力均匀，深层肌肉得到锻炼，可以有效缓解和治疗脊柱疼痛等脊柱疾病，有助健康。4）依据研究结果提出“靠墙站桩”简易健身方法。 相似文献
17.
18.
Abraham Tchako 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(1):78-95
A complete and detailed three-dimensional finite element model of the human cervical spine (C1–C7), including soft and hard tissues, was created using a digitized geometric measurement tool. The model was validated against existing experimental studies in flexion, extension, lateral bending, and axial rotation. The aims of this study were to use the model to simulate the mechanisms of injury scenarios, such as diving and football accidents, and to correlate the external and internal responses of the spinal components to disc herniation and clinical instability. It was determined that a shear-generated flexion moment of about 10 Nm or a compression-flexion load of 450 N would generate significant stresses and strains in the discs, together with sufficient posterior-anterior displacement and rotational angulation of the vertebrae, to place the mid and lower cervical spine at risk of clinical instability or disc herniation. The results revealed that the location of the maximum stresses in the discs could not be directly correlated with the type of loads. In addition, for the loadings considered, the maximum displacement of the spine could be reduced by as much as 50% when the restraint of the cervical spine is changed from a C7–T1 to C7–T1 and C1–C2 fixed conditions. 相似文献
19.
《Information processing & management》2022,59(6):103101
On-shelf book segmentation and recognition are crucial steps in library inventory management and daily operation. In this paper, a detailed investigation of related work is conducted. RFID and barcode-based solutions suffer from expensive hardware facilities and long-term maintenance. Digital Image processing and OCR techniques are flawed due to a lack of accuracy and robustness. On this basis, we propose a visual and non-character system utilizing deep learning methods to accomplish on-shelf book segmentation and recognition tasks. Firstly, book spine masks are extracted from the image of on-shelf books by instance segmentation model, followed by affine transformation to rectangle images. Secondly, a spine feature encoder is trained to learn the deep visual features of spine images. Finally, the book inventory search space is constructed and the similarity metric between spine visual representations is calculated to recognize the target book identity. To train the models we collect high-resolution datasets of 10k-level and develop a data annotation software accordingly. For validation, we design simulated scenarios of recognizing 3.6k IDs from 5.6k book spines and achieve a best top1 accuracy of 99.18% and top5 accuracy of 99.91%. Furthermore, we develop a prototype of a mobile library management robot with embedded edge intelligence. It can automatically perform on-shelf book image capturing, spine segmentation and recognition, and target book grasping workflow. 相似文献
20.
由于编目员对著录规则理解的差异,有两种情况的封面题名和书脊题名的著录存在一些问题,一种是封面题名或书脊题名与200字段中的正题名相同,但从属于它们的其它题名信息或分辑题名不同的情况;另一种是封面题名或书脊题名直接是题名页的副题名的情况。封面题名和书脊题名的著录应该首先要明确字段著录条件和设置目的,不要重复制作检索点;其次要考虑用户利用的便利性,不应遗漏检索点;同时要把握好客观著录的原则,并且充分发挥编目员的主观能动性。 相似文献