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Hasan Ulas Yavuz Deniz Erdağ Arif Mithat Amca Serdar Aritan 《Journal of sports sciences》2015,33(10):1058-1066
The aim of this study was to compare the musculature activity and kinematics of knee and hip joints during front and back squat with maximal loading. Two-dimensional kinematical data were collected and electromyographic activities of vastus lateralis, vastus medialis, rectus femoris, semitendinosus, biceps femoris, gluteus maximus and erector spinae were measured while participants (n = 12, 21.2 ± 1.9 years old) were completing front and back squat exercises with maximum loading. Paired sample t-test was used for comparisons between two techniques. Results showed that the electromyographic activity of vastus medialis was found to be greater in the front squat compared to the back squat during the ascending phase (P < 0.05, d = 0.62; 95% CI, ?15.0/?4.17) and the whole manoeuvre (P < 0.05, d = 0.41; 95% CI, ?12.8/?0.43), while semitendinosus (P < 0.05, d = ?0.79; 95% CI, 0.62/20.59) electromyographic activity was greater in the back squat during the ascending phase. Compared to the front squat version, back squat exhibited significantly greater trunk lean, with no differences occurring in the knee joint kinematics throughout the movement. Results may suggest that the front squat may be preferred to the back squat for knee extensor development and for preventing possible lumbar injuries during maximum loading. 相似文献
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This one semester case study intended to explore the roles of the instructor and students in design activities based on project based learning via cloud computing technology. Participants were 13 pre-service computer teachers enrolled in an internet programming course at faculty of education. Online course records, interviews and questionnaires were used to collect data. The data were analyzed via qualitative techniques. Results suggested that cloud computing facilitates planning, collaboration, and communication and also supports individual learning in online project based design activities. The instructor exhibited the roles of guidance, technical support, administrate and communicate. Students’ roles were found as cooperation, coordination, communication, leadership, practice, effort provide in project based activities. The results are hoped to provide insights about the roles of the instructor and students in online project based design activities. Along with the study findings, some implications were discussed for using cloud computing effectively in project based learning. 相似文献
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Turgay Demirel Turkan Karakus Yilmaz 《British journal of educational technology : journal of the Council for Educational Technology》2019,50(3):1482-1494
The goal of this study is to determine the effectiveness of mind games played by secondary school sixth grade students as classroom activities in math and grammar courses on their perceived problem-solving skills and achievements. In the quantitative part of the study, the nonequivalent groups pre-test–post-test control group design from single-factor quasi experimental designs was used. Qualitative data collection and analysis approaches have also been used to support and explain quantitative data. The study's sample group, which was formed using a convenience sampling method, consisted of 48 sixth grade secondary school students who studied in a moderately developed city center in Turkey and their teachers. An achievement test, perceived problem-solving skills scale and semistructured interview guide were used as the data collection tools. According to the findings, the students in the experimental group who played mind games showed development in their perceived problem-solving skills and achievements compared to the control group. The opinions of the teachers and students on the effects of the mental practices were also found to be positive. 相似文献
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