最后用力阶段髋的稳定性对标枪运动员出手初速度的影响

通过对我国男子优秀标枪运动员最后用力阶段髋关节的运动状态进行测试与比较，发现左、右髋有其自身的运动规律，其稳定性直接影响到标枪的出手效果。     

短跑教学中髋关节灵活性练习方法的探讨

髋关节的灵活性能限制髋与下肢的活动幅度以及肌肉工作的距离 ,在短跑技术的教学和训练中 ,体育工作者常用“送髋”二字来提示运动员或者帮助运动员纠正错误技术动作。但是 ,在实践中人们对髋关节灵活性的练习还不够重视。反映在运动员髋关节的灵活性较差 ,导致短跑成绩停留在原有的水平上。笔者着重从理论和实践上阐述加强髋关节的灵活性和柔韧性练习在短跑教学与训练中的重要性。     

短跑运动员王能希髋摆动技术改进对百米成绩的影响

采用文献资料法、实验法和对比分析法等研究方法,通过对现役运动员王能希的历时两年跟踪调查研究,拍摄其途中跑的影像资料并进行解析,取得其运动学数据。通过对比分析数据的变化来剖析髋关节摆动技术对短跑成绩的影响。     

Bringing back sweet (and not so sweet) memories: the cultural politics of memory,hip‐hop,and generational identities

This article examines the salience of collective ‘memory’ and ‘remembering’ among a group of students in Hip‐Hop Lit, a hip‐hop centered English literature course that I co‐taught at ‘Howard High School,’ an urban high school in the Northeastern United States. Specifically, this article examines the memory work that occurred within Hip‐Hop Lit in response to the students’ interactions with one of the course texts, Things Done Changed by rapper Notorious B.I.G. From this and other classroom texts, students were able to construct, contest, and reinscribe memories about the past. Through these memories, students were able to reaffirm and challenge particular social identities that informed and reflected their lived experiences.     

Acute and sub-acute effects of repetitive kicking on hip adduction torque in injury-free elite youth soccer players

Abstract

Hip adduction strength is important for kicking and acceleration in soccer players. Changes in hip adduction strength may therefore have an effect on soccer players’ athletic performance. The purpose of this study was to investigate the acute and sub-acute effects of a kicking drill session on hip strength, concerning isometric hip adduction, abduction and flexion torque of the kicking leg and the supporting leg. Ten injury-free male elite soccer players, mean ± s age of 15.8 ± 0.4 years participated. All players underwent a specific 20 min kicking drill session, comprising 45 kicks. The players were tested the day before, 15 min after and 24 h after the kicking drill session by a blinded tester using a reliable test procedure. The isometric hip-action and leg-order were randomized. For the kicking leg, hip adduction torque increased from 2.45 (2.19–2.65) Nm ? kg^?1, median (25th–75th percentiles), at pre-kicking to 2.65 (2.55–2.81) Nm ? kg^?1 (P = 0.024) 24 h post-kicking. This may have implications for the soccer player’s ability to maximally activate the hip adductors during kicking and acceleration, and thereby improve performance the day after a kicking drill session.     

Isokinetic imbalance of hip muscles in soccer players with osteitis pubis

Abstract

In this study, we compared the isokinetic torques of hip flexors/extensors and abductors/adductors in soccer players suffering from osteitis pubis (OP), with normal soccer players. Twenty soccer male athletes with OP and 20 normal soccer athletes were included in this study. Peak torque/body weight (PT/BW) was recorded from hip flexor/extensor and abductor/adductor muscles during isokinetic concentric contraction modes at angular velocity of 2.1 rad · s^?1, for both groups. The results showed a significant difference between the normal and OP groups for hip flexors (P < 0.05). The normal group had significant, lower PT/BW value than the OP group for their hip flexors (P < 0.05). The hip flexor/extensor PT ratio of OP affected and non-affected limbs was significantly different from that of normal dominant and non-dominant limbs. There were no significant differences between the normal and OP groups for hip extensor, adductor and abductor muscles (P > 0.05). Regarding the hip adductor/abductor PT ratio, there was no significant difference between the normal and OP groups of athletes (P > 0.05). The OP group displayed increase in hip flexor strength that disturbed the hip flexor/extensor torque ratio of OP. Therefore, increasing the hip extensor strength should be part of rehabilitation programmes of patients with OP.     

Association of Obesity with Hormonal Imbalance in Infertility: A Cross-Sectional Study in North Indian Women

Hormones play an important role in the development and regulation of reproductive function and the menstrual cycle of women. Extremes of body weight tend to affect the homeostasis of the hypothalamo–pituitary–gonadal axis. This cross-sectional study was carried out in 113 women (57 with primary infertility and 56 with secondary infertility) in the age group 20–35 years, presenting for hormonal evaluation of infertility in a tertiary care hospital. After preliminary clinical evaluation, anthropometric indices (height, weight, BMI, waist circumference and waist hip ratio) were measured in all subjects. Fasting blood sample drawn on second/third day of menstrual cycle was analysed for serum luteinizing hormone, follicle stimulating hormone (FSH), prolactin and thyroid stimulating hormone (TSH). Serum FSH levels showed a significant positive correlation with indicators of central obesity (waist circumference and waist hip ratio in both the study groups). In primary infertility, significant positive correlation was also observed between serum FSH levels and other markers of obesity like body weight, hip circumference and BMI. In secondary infertility, serum prolactin and serum TSH levels demonstrated a significant positive correlation with body weight and BMI. Obesity is associated with hormonal derangements which are responsible for infertility. In overweight women with infertility, weight loss should be considered as a first line treatment.     

后蹬、后扒的特征和定义的辨析

采用文献资料法、专家访谈法、类比法、归纳法、综合分析法对现有书籍和杂志中有关学者对后蹬、后扒的定义进行评述和总结,对后蹬和后扒的异、同点、主要工作肌和动作工作机制进行分析,提出后蹬和后扒的新观点,在此基础上重新定义为"扒蹬"这一新概念。     

贵州省优秀男子押加运动员髋关节肌群生物力学特征分析

为了解优秀男子押加运动员髋关节肌群用力的生物力学特征,以4名优秀押加运动员为研究对象,采用ISOMED 2003等速系统对其髋关节肌群在60°/s向心收缩速度下的生物力学特征进行测试分析。结果显示:从总体上看,优秀押加运动员髋关节两侧伸肌肌力均显著大于同侧屈肌,两侧伸肌肌力发展比较均衡,而两侧屈肌肌力的均衡性还有待加强;而从个体的角度分析,拥有较高的相对峰值力矩和适当的屈肌相对峰值力矩,髋关节两侧同名肌比值控制在0.9-1.1之间和两侧屈伸肌肌力比值控制在0.4-0.52之间是冠军运动员髋关节肌群所具有的特征。结论:髋关节伸肌肌力的大小、两侧同名肌肌力与同侧屈伸肌肌力是否能协调发展是影响押加运动员成绩的重要因素。     

我国男子100m跑技术现状的分析

采用文献资料法和数理统计法，从技术角度对当今中国男子100m跑技术进行全面的统计分析。指出：目前中国男子100m跑技术应从髋关节在短跑中的作用、起跑后的加速跑、全程跑过程中的放松能力三个方面来不断完善，为在2008年奥运会上取得好的成绩打下坚实的基础。