Mapping not tracing: qualitative educational research with political teeth

In this article, we deploy ideas from Deleuze and Guattari to argue for the importance of engaging in educational research practice designed to be productive (mapping) rather than representational (tracing). First, we introduce the significance of our approach for educational research practice. Second, we unpack key constructs from Deleuze and Guattari required for constructing our argument, and we outline the shape of mapping as productive or transformative research practice. Third, we share critical summaries of several studies that utilized mapping to engage in this kind of research practice. Finally, we discuss the nature, effects, and relevance of mapping as educational research practice.     

香港巴塞尔,沙漠中的绿洲?

本届香港巴塞尔艺术展(Art Basel HK)早在举办前就已收获了艺术圈的足够关注和期待,开幕当天雷暴雨的天气也并未消减业内人士对于此的热情。这是两年前MHC瑞士展会集团收购香港艺博会(Art HK)后的首次试水,香港艺博会自2008年成立5年后进而成为亚洲最重要的国际级博览会之一,几乎奇迹般地将香港这片艺术沙漠变为亚太地区的艺术交易重镇。对于瑞士人来说,如何借鉴巴塞尔与迈阿密海滩巴塞尔艺术展的欧美模式,使之恰当地融入亚洲艺术市场的环境中,成了主办方的首要课题。     

A bioengineering analysis of human muscle and joint forces in the lower limbs during running

A two‐dimensional, dynamic bioengineering model of the lower limbs was developed in order to estimate muscle and joint forces present during running at 4.5 m s ^‐1. Data were collected from four subjects using a force platform and cine film. Individual X‐rays and anthropometric data from the lower limbs were utilized to produce accurate bone models of the subjects’ legs. Electromyographic verification of the model was undertaken while a runner was undergoing treadmill running at 4.5 m s^‐1. Results indicate that peak muscle forces of 22 times subject body weight (22 BW) could be present in the quadriceps muscle group and 7 BW in the gastrocnemius. The anterior shin muscles were found to be active for the first 9% of stance phase only, and compressive loads of 33 BW were found in the knee joint. The relationship between these nigh forces in the lower limbs and running related injuries is discussed.     

Validity and reliability of GPS for measuring distance travelled in field-based team sports

Abstract

The aim of the present study was to examine the effects of movement intensity and path linearity on global positioning system (GPS) distance validity and reliability. One participant wore eight 1-Hz GPS receivers while walking, jogging, running, and sprinting over linear and non-linear 200-m courses. Five trials were performed at each intensity of movement on each 200-m course. One receiver was excluded from analysis due to errors during data collection. The results from seven GPS receivers showed the mean (±s) and percent bias of the GPS distance values on the 200-m linear course were 205.8 ± 2.4 m (2.8%), 201.8 ± 2.8 m (0.8%), 203.1 ± 2.2 m (1.5%), and 205.2 ± 4 m (2.5%) for the walk, jog, run, and sprint trial respectively. Walk and sprint distances were significantly different from jogging and running distances (P < 0.05). The GPS distance values on the 200-m non-linear course were 198.9 ± 3.5 m (?0.5%), 188.3 ± 2 m (?5.8%), 184.6 ± 2.9 m (?7.7%), and 180.4 ± 5.7 m (?9.8%) for the walk, jog, run, and sprint trial respectively; these were significantly lower than those for the corresponding values on the linear course (P < 0.05). Differences between all non-linear movement intensities were significant (P < 0.05). The overall coefficient of variation within and between receivers was 2.6% and 2.8% respectively. Path linearity and movement intensity appear to affect GPS distance accuracy via inherent positioning errors, update rate, and conditions of use; reliability decreases with movement intensity.     

Biomechanical analysis of the change in pistol shooting format in modern pentathlon

Abstract

Despite the importance of the Combined Event to the modern pentathlon competition, little is known about performance in the event. This study aimed to (i) identify the key variables affecting Combined Event shooting performance, and the extent to which these corresponded with those identified for precision shooting and (ii) investigate the impact of changing shooting format, and whether more successful precision shooters were also more successful in the Combined Event. Seven modern pentathletes and three pistol shooters completed precision and Combined Event trials. An opto-electronic shooting system recorded score and pistol movements, whilst force platforms recorded centre of pressure movements 1 s prior to every shot. Intra-individual analysis revealed that the extent of associations between variables was participant-specific, highlighting the need for individual analysis of performance. No participants displayed matching associations between variables for precision and Combined Event shooting, emphasising the difference between performances in the two events. Both groups experienced significantly reduced scores, and increased pistol and body movements for Combined Event shooting (P < 0.05). Despite the pistol shooters’ greater precision shooting ability, no significant differences were evident between the groups’ Combined Event performances (P > 0.05). This implies that experience in one event does not guarantee success in the other, indicating the importance of event specific training.     

Early visual cues associated with a directional place kick in soccer

The purpose of this paper was to establish postural cues in kicking that may be of use to goalkeepers. Eight male soccer players (age 20.5 ± 1.1 yrs; height 1.78 ± 0.053 m; mass 75.18 ± 9.66 kg) performed three types of kick: a low side-foot kick to the left hand corner of the goal, a low side-foot kick straight ahead, and a low instep kick straight ahead. Kicks were recorded by an optoelectronic motion analysis system at 240 Hz. At kicking foot take-off (about 200 ms before ball contact) the variables which were significantly different and could act as cues were support foot progression angle, pelvis rotation, and kicking hip and ankle flexion. The support foot progression angle was considered to be the most valuable of these variables as its angle coincided with the direction of ball projection. The other variables were less clear in their interpretation and so less valuable for a goalkeeper to use for decision making. Cues appearing after support foot contact were thought unlikely to be of value to a goalkeeper in their decision making. These include kicking leg knee flexion angle, and support leg shank and thigh angles.