侗族青少年足型研究

为了解侗族青少年足型及其发展趋势 ,按活体测量要求 ,对湖南通道、靖州共 1343名侗族青少年 (7～ 18岁 )的足长、足宽进行了测量 ,并按足宽足长指数进行分型 结果表明 :侗族青少年的足长、足宽分别随年龄增长而增长 ,16岁左右接近成人水平 ;足长与足宽之间存在正相关 ;足型以中间型最多     

浅析丁尼生短诗《鹰》的音乐美和形式美

诗歌一开始就和音乐有不解之缘 ,而丁尼生素有“文字音乐家”之称。本文从音韵和节律等方面分析丁尼生的《鹰》诗中的音乐美和形式美以及它们与诗歌主题的一致性     

游泳中双手双脚重叠并拢滑行技术分析

对游泳中双手双脚重叠并拢滑行技术进行初步的研究，探索其可行性。经研究分析得出，采用双手双脚重叠并拢滑行技术能够直接提高出发、转身、蹬边的速度，效果较为明显。通过此技术的应用，能直接提高竞技游泳各项目的运动成绩。     

超大型储液罐流固耦合振动分析

针对某超大型储液罐进行了流固耦合振动分析。首先应用ANSYS建立了储液罐-液体的流固耦合振动模型,求得了前20阶振动模态;接着分析了液面波动和储液量对耦合固有频率的影响,并取了一个高罐模型进行了高、低罐的模态分析对比;最后对"象足凸鼓"现象进行了探讨,解释了造成"象足凸鼓"现象的原因。     

风的曲线

Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose.     

基于Flash平台的《光的全反射》CAI课件设计与制作

应用Flash平台,通过光的入射、折射和反射之间的关系来演示全反射的过程,详细介绍该课件设计和制作过程.     

汉语节律的自然特征

汉语韵律研究必须立足于汉语的特点,必须先弄清楚它的自然特征。古代诗词格律源于自然语言节律,形成一种压倒句法的强制性格式,可以作为探讨汉语节律自然特征的依据。本文主要讨论关于节律的三个相关问题:1.音步长度的确认及其类型;2.音步组合的松紧及其规律;3.律动要素的选择及其位置。     

Correspondence

Abstract

Selected kinematic variables of the foot segments and the metatarsophalangeal (MTP) joint were investigated in relation to sprinting performance among 100 m sprint athletes at the 2000 Summer Olympic Games. It was hypothesized that the kinematics of the MTP joint, and forefoot and rearfoot segments, are related to sprint performance for both male and female athletes. Kinematic sagittal plane data were collected using two digital video cameras recording at 120 fields per second. It was determined that faster male sprinters experienced higher maximal rates of MTP extension, and faster female sprinters touch down with higher posterior sole angles and take off with lower posterior sole angles.     

Impact phase kinematics of instep kicking in soccer

Abstract

The purpose of this study was to capture the lower limb kinematics before during and after ball impact of soccer kicking by examining the influence of both sampling rate and smoothing procedures. Nine male soccer players performed maximal instep kicks and the three-dimensional leg movements were captured at 1000 Hz. Angular and linear velocities and accelerations were determined using four different processing approaches: processed using a modified version of a time-frequency filtering algorithm (WGN), smoothed by a second-order low-pass Butterworth filter at 200 Hz cut-off (BWF), re-sampled at 250 Hz without smoothing (RSR) and re-sampled at 250 Hz but filtered by the same Butterworth filter at 10 Hz cut-off (RSF). The WGN approach appeared to establish representative kinematics, whereas the other procedures failed to remove noisy oscillation from the baseline of signal (BWF), lost the peaks of rapid changes (RSR) or produced totally distorted movement patterns (RSF). The results indicate that the procedures used by some previous studies may have been insufficient to adequately capture the lower limb motion near ball impact. We propose a new time-frequency filtering technique as a better way to smooth data whose frequency content varies dramatically.     

Measuring kinematic changes of the foot using a gyro sensor during intense running

Abstract

Gyro sensor has been used to measure foot pronation during running with reliable results in previous studies, and the signals were not affected by the vibration of heel strikes. The purpose of this study was to observe the kinematic changes of the foot during intense running using a 3-axis gyro sensor. Fifteen male participants (average age: 24.5 ± 1.7 years; mean height: 174.1 ± 3.3 cm; mean body weight: 71.0 ± 5.5 kg) were recruited in this study. Foot kinematic changes were observed in 30-min intense running protocols. The comparisons of the signals from gyro and motion analysis system were also performed to determine the accuracy of the gyro and showed positive results. In the main experiment, the ankle range of motion (ROM) in the frontal plane, measured using a motion system, showed a significant increase over time. Accordingly, peak angular velocity in the frontal plane also showed a significant increase. The correlation between ankle ROM and peak angular velocity in the frontal plane is significantly high (r = 0.975). Moreover, peak angular velocity in the frontal plane is also significantly correlated with both rate of perceived exertion (RPE) (r = 0.911) and heart rate (r = 0.960). This study concluded that an alarm system for foot kinematic changes related to running injuries can be built based on the peak angular velocity of the foot in the frontal plane.