CAN SHORT BOUTS OF TECHNIQUE TRAINING IMPROVE SPRINT TECHNIQUE AND PERFORMANCE IN YOUTH SOCCER PLAYERS?

This study aimed to investigate whether a technique-oriented intervention would result in improvements in sprint running technique and sprint performance in youth soccer players. Fourteen youth soccer players with pelvis and trunk control issues were divided into intervention and control groups. The intervention group did three weekly 15 minute running technique-oriented training sessions over seven weeks while their counterparts continued with their usual training programme. Sprint performance and technique were assessed before and after the intervention with a Laveg device and two video cameras, respectively, during a 40-m maximal sprint test. The players of the intervention group showed improved control of the trunk and pelvis (p≤0.01) while no change was observed in the control group. Both groups showed a trend for improvement in sprint performance

USING INSTAGRAM IN THE SPORTS BIOMECHANICS CLASSROOM

The main objective of the investigation was to evaluate the change in perception of students in the use of Instagram as a learning medium for qualitative biomechanical analysis as a part of their undergraduate sports science programme. 106 undergraduate students filled out a questionnaire on the use of smartphones, social networks and Instagram in a biomechanics classroom before and after participating in an assignment.The results of our study show the change in perspective in the participants about the use of social networks to do assignments, specifically in Biomechanics (PRE 3.0±1.4 vs POST 3.6±1.1,

ANALYSIS OF STROKE, COORDINATIVE AND TEMPORAL PARAMETERS IN TRANSITION FROM UNDERWATER TO SURFACE SWIMMING

The objective of this study was to characterize the stroking, coordinative and temporal parameters of international swimmers during transition from underwater to surface swimming. 12 international junior swimmers were filmed on the four strokes and they wre video analysed using DLT-20 algorithms to calculate the swimming velocity, stroking rate and stroking length at emersion as well as the index of coordination (IdC) and the % of each stroke phase duration on the complete cycle. The descriptive analysis of these data showed higher swimming velocity, stroking rate and IdC but shorter stroking length than previous studies characterizing free swimming. Also, the relative duration of the non-propulsive stroke phases was shorter when emerging from underwater. Therefore, the stroke, coordinative and temporal parameters should also be monitored during the transition phase of the swimming start and turns

Effects of different swimming race constraints on turning movements

The aim of this study was to investigate the effects of different swimming race constraints on the evolution of turn parameters. One hundred and fifty-eight national and regional level 200-m (meters) male swimming performances were video-analyzed using the individualized-distance model in the Open Comunidad de Madrid tournament. Turn (p .05). Higher expertise swimmers obtained faster average velocities and longer distances in all the turn phases (p < .001, ES = 0.59), except the approach distance. In addition, national level swimmers showed the ability to maintain most of the turn parameters throughout the race, which assisted them in improving average velocity at the end of races. Therefore, the variations in the turning movements of a swimming race were expertise-related and focused on optimizing average velocity. Turning skills should be included in the swimming race action plan

EFFECT OF PREVIOUS HAMSTRING INJURY AND LIMB DOMINANCE ON KICKING BIOMECHANICS IN ELITE FEMALE SOCCER PLAYERS

The hamstring injury is one of the most common injuries occurring in soccer. The purpose of this study was to identify the effect of a previous hamstring injury and limb dominance on the kicking pattern of elite female soccer players. 14 players belonging to a top first division soccer team volunteered to take part in the study. They were asked about their injury history and leg dominance in a questionnaire, and they performed 5 instep soccer kicks with either limb into a target 7m away. The results showed that limb dominance had no effect on the kicking pattern in elite players. Significant differences were found in the maximum hip angular velocity while kicking with a previously injured limb as compared to a previously uninjured limb. This indicates that rehabilitation programs probably should treat the injury differently in female soccer players

PENERAPAN MODEL PEMBELAJARAAN KOOPERATIF TIPE TEAM ACCELERATED INSTRUCTION GUNA MENINGKATKAN PRESTASI BELAJAR SISWA DI MA Al-Inayah BANDUNG (Studi Eksperimen Pada Mata Pelajaran Ekonomi Kelas X IIS Tahun Ajaran 2016/2017)

“Penerapan Model Pembelajaran Kooperatif Tipe Team Accelerated Instruction Guna Meningkatkan Prestasi Belajar Siswa di MA Al-Inayah Bandung (Studi Eksperimen Pada Mata Pelajaran Ekonomi Kelas X IIS Tahun Ajaran 2016/2017)”. Penelitian ini dilatar belakangi oleh rendahnya prestasi belajar siswa dan penggunaan metode pembelajaran konvensional yaitu metode ceramah yang menyebabkan siswa merasa bosan pada saat mengikuti pembelajaran. Penelitian ini bertujuan untuk mengetahui bagaimana pengaruh penerapan model pembelajaran kooperatif tipe Team Accelerated Instruction guna meningkatkan prestasi belajar siswa pada mata pelajaran ekonomi kelas X IIS di MA Al-Inayah Bandung. Penelitian ini dirancang menggunakan metode eksperimen dengan objek penelitian kelas X IIS 2 sebagai kelas eksperimen dengan jumlah 26 siswa dan kelas X IIS 3 sebagai kelas kontrol dengan jumlah 24 siswa. Teknik pengumpulan data dilakukan dengan cara pelaksanaan pretest, treatment dan posttest, teknik pengolahan data pada penelitian ini menggunakan Software SPSS 24.0 for windows. Hasil pengolahan data pada uji hipotesis yang dilakukan dengan uji-t menunjukkan bahwa signifikansi (sig.2-tailed) dengan uji-t adalah 0,160. Karena sig. 0,160 lebih besar dari 0,05 maka H0 ditolak dan Ha diterima. Sehingga, dapat disimpulkan bahwa terdapat pengaruh penerapan model pembelajaran kooperatif tipe Team Accelerated Instruction guna peningkatan prestasi belajar siswa pada mata pelajaran ekonomi pada kelas X IIS di MA Al-Inayah Bandung. Sebagai akhir penelitian penulis menyampaikan saran kepada guru ekonomi agar dapat lebih kreatif dalam menjalankan proses pembelajaran dengan mengembangkan dan menggunakan berbagai macam model pembelajaran, kepada peserta didik agar dapat berusaha lebih aktif dalam pelaksanaan pembelajaran dengan menggali berbagai informasi yang menyangkut mengenai materi pembelajaran yang akan diberikan oleh guru, kepada pihak sekolah diharapkan model pembelajaran kooperatif tipe Team Accelerated Instruction dapat dijadikan sumber informasi berharga terutama dalam meningkatkan prestasi belajar siswa dan bagi peneliti selanjutnya diharapkan memiliki ketertarikan terhadap model pembelajaran kooperatif tipe Team Accelerated Instruction dan dapat mengembangkan dengan inovatif pada pelajaran dan kelas yang berbeda. Kata kunci: Model Pembelajaran Kooperatif tipe Team Accelerated Instruction dan Prestasi Belajar Siswa

Electromyographic activity of quadriceps and hamstrings of a professional football team during Bulgarian Squat and Lunge exercises

The aim of this study was to analyse the quadriceps-hamstring coactivation in the lunge and Bulgarian squat exercises. A cross-sectional study design was applied to seventeen healthy professional football players. Muscular activity was measured using wireless surface electromyography (sEMG). The Maximum Voluntary Isometric Contraction was used to normalize the data. The muscle activation of each muscle belly was significantly different between the two exercises (F4.24 = 28.076, p .05). In both the lunge and the Bulgarian squat, a significantly greater activation of the vastus medialis (VM) and the vastus lateralis (VL) muscles were found compared to the rectus femoris (RF) and biceps femoris (BF) and semitendinosus (ST). Muscles showed a greater activation during the Bulgarian squat compared to the lunge, but the hamstrings to quadriceps ratio was similar in both exercises (p > .05). The present work shows that the Bulgarian Squat exercise produces greater muscle activation than the Lunge exercise, whereas in both exercises there is a similar pattern of muscle activation. No differences were found between legs. If one wants to work specifically on strength development, the Bulgarian Squat would be a better option, as would be the case if one were to focus on synergistic work on the quadriceps and hamstrings, as the Bulgarian Squat exercise shows a higher H:Q ratio

A PREVIOUS HAMSTRING INJURY AFFECTS LIMB DOMINANCE IN SOCCER KICKING

The objective of this study was to study if the influence of limb dominance on kicking is affected by a previous hamstring injury to either limb. Forty-five players (26 females and 19 males) belonging to elite soccer teams volunteered to take part in the study. They performed 5 instep soccer kicks with either limb into a target 7m away. Differences were found across limb dominance for the uninjured group in peak linear velocities, hip flexion velocity, knee angle at ball impact, and hip moments. A previous injury prevented the rapid extension of the hamstring muscle fibres, being more predominant in the nondominant limb. Thus the effects of a previous hamstring injury must be taken into account while dealing with the kicking technique, and the location of the injury on the dominant or non-dominant limb is equally important

GENDER EFFECTS ON LIMB DOMINANCE IN KICKING BIOMECHANICS IN ELITE SOCCER PLAYERS

The objective of this study was to study the effect of gender on the limb dominance in kicking in soccer players. Forty-five players (twenty-six females and nineteen males) belonging to elite soccer teams volunteered to take part in the study. They performed 5 instep soccer kicks with either limb into a target 7m away. Female soccer players h d a lesser flexed knee at ball impact in the non-dominant limb which contributed to lower ball velocities in the toe and subsequently in the ball. Both gen&rs had a shorter backswing with the non-dominant limb, but this difference was made up in the follow through for males and in the subsequent phases for females. Working on bilateral symmetry and coordination would help improve kicking with the non-dominant limb, especially in females

EPIDEMIOLOGICAL STUDY OF SPANISH RECREATIONAL RUNNERS

The objective of this study was to analyze how different training aspects and biological factors in running affect the probability of suffering an injury and which muscles and joints are more susceptible to develop an injury. A total of 408 subjects, 206 cases and 202 controls, participated in the investigation. The inferior body was more prone to an injury, especially the muscles and tendons associated with the knee and the shank. Several characteristics of the runner and his/her training habits like the sex, age, experience, motivation and mileage have an impact on the injury risk. This information is very useful because biomechanists and coaches can design programs to improve the technique of the runners and reduce the risk of an injury