Electromyographic analysis of lower limb muscles during the golf swing performed with three different clubs

The aim of this study was to describe and compare the EMG patterns of select lower limb muscles throughout the golf swing, performed with three different clubs, in non-elite middle-aged players. Fourteen golfers performed eight swings each using, in random order, a pitching wedge, 7-iron and 4-iron. Surface electromyography (EMG) was recorded bilaterally from lower limb muscles: tibialis anterior, peroneus longus, gastrocnemius medialis, gastrocnemius lateralis, biceps femoris, semitendinosus, gluteus maximus, vastus medialis, rectus femoris and vastus lateralis. Three-dimensional high-speed video analysis was used to determine the golf swing phases. Results showed that, in average handicap golfers, the highest muscle activation levels occurred during the Forward Swing Phase, with the right semitendinosus and the right biceps femoris muscles producing the highest mean activation levels relative to maximal electromyography (70–76% and 68–73% EMG_MAX, respectively). Significant differences between the pitching wedge and the 4-iron club were found in the activation level of the left semitendinosus, right tibialis anterior, right peroneus longus, right vastus medialis, right rectus femuris and right gastrocnemius muscles. The lower limb muscles showed, in most cases and phases, higher mean values of activation on electromyography when golfers performed shots with a 4-iron club.     

Alternative Conceptions: Turning Adversity into Advantage

Research in Science Education - While a vast body of research has identified difficulties in students’ understanding about forces and acceleration and their related alternative conceptions,...     

Environmental Education through Hiking: a qualitative investigation

The increasing popularity of outdoor activities, especially hiking, indicates that people are looking for new ways to interact with the natural environment. Hiking could play a role in environmental education by exposing people to cases of environmental deterioration and so raise an awareness of environmental problems. The contribution of hiking in developing a basic understanding of the environment and its problems could result in feelings of concern that lead to active involvement in resolving environmental issues. A qualitative investigation was carried out which involved the completion of three 5 day trails by the same five subjects. Each hiker was required to make daily notes on each hike, which were subsequently analysed. The purpose of the investigation was to ascertain what people notice in the environment during hikes and whether this could influence environmental education. Four themes were identified on analysis of the daily responses, namely the natural and physical environment, trail aspects, each hiker's physical and psychological preparedness and cognitive development and social aspects ranging from group interaction to human impact on the environment. Each of these themes is described and supplemented with appropriate quotations from the daily responses.     

A multilevel hypernetworks approach to capture meso-level synchronisation processes in football

ABSTRACT

Understanding team behaviours in sports performance requires understanding the interdependencies established between their levels of complexity (micro-meso-macro). Previously, most studies examined interactions emerging at micro- and macro-levels, thus neglecting those emerging at a meso-level (reveals connections between player and team levels, depicted by the emergence of coordination in specific sub-groups of players–simplices during performance). We addressed this issue using the multilevel hypernetworks approach, adopting a cluster-phase method, to record player-simplice synchronies in two performance conditions where the number, size and location of goals were manipulated (first-condition: 6 × 6 + 4 mini-goals; second-condition: Gk + 6 × 6 + Gk). We investigated meso-level coordination tendencies, as a function of ball-possession (attacking/defending), field-direction (longitudinal/lateral) and teams (Team A/Team B). Generally, large synergistic relations and more stable patterns were observed in the longitudinal direction of the field than the lateral direction for both teams, and for both game phases in the first condition. The second condition displayed higher synchronies and more stable patterns in the lateral direction than the longitudinal plane for both teams, and for both game phases. Results suggest: (i) usefulness of hypernetworks in assessing synchronisation of teams at a meso-level; (ii) coaches may consider manipulating these task constraints to develop levels of local synchronies within teams.     

The Generalizability of Students’ Interests in Biology Across Gender, Country and Religion

In order to bridge the existing gap between biology curricula and students’ interests in biology, a strategy for identifying students’ interest based on their questions and integrating them into the curriculum was developed. To characterize the level of generalizability of students’ science interests over 600 high school students from Portugal, Turkey, England and Israel, who chose biology as an advanced subject, their interest level was ranked in 36 questions that were originally raised by Israeli students. Results indicate that students from four different countries show interest in similar science questions. The most intriguing questions were the ones that dealt with human health and new developments in reproduction and genetics. Religious affiliation had the strongest effect on students’ interest level, followed by national affiliation and gender. The findings suggest that students’ interest in one context is relevant to the development of interest-based learning materials in a different context. However, despite these similarities, cultural and sociological differences need to be taken into account.     

A role of team and organizational identification in the success of cause-related sport marketing

As sport marketers are increasingly engaging in cause-related sport marketing (CRSM) programs, there is a growing interest in understanding what CRSM characteristics and circumstances can lead to success. This study extends prior research by examining the direct and moderating impacts of team identification and cause organizational identification on consumer attitudes toward cause related sport marketing (CRSM) programs using intercollegiate sport contexts in the United States. A two groups (high vs. low-fit CRSM messages), between subject, and post-test only experiment (N = 309) denoted that respondents showed more positive attitudes toward high-fit CRSM messages and both team identification and cause organizational identification had different moderating effects of sport/cause fit on attitudes. Fit between a sport team and a cause had a greater impact on attitudes when consumer affinity toward the sport team was more positive. However, fit had little or no impact when consumer affinity toward the cause was positive, but it played a significant and positive role when consumers showed low affinity toward the cause.     

A window into different cultural worlds: young children's everyday activities in the United States, Brazil, and Kenya

A powerful means to understand young children's normative development in context is to examine their everyday activities. The daily activities of 79 children (3 years old) were observed, for 20 hr each, in their usual settings. Children were selected from 4 cultural groups: European American and African American (Greensboro, United States), Luo (Kisumu, Kenya), and European descent (Porto Alegre, Brazil), evenly divided by social class. Examining children's naturally occurring engagement in school-relevant activities, both in and out of child care, revealed the importance of ecological context. The variation in activities was not explainable simply by cultural group (including race within the United States) or social class, but by the intersection of culture and class. The developmental implications of these findings are discussed.