scholarly journals Biomechanical Analysis of Successful and Unsuccessful Snatch Lifts in Elite Female Weightlifters

2019 ◽  
Vol 68 (1) ◽  
pp. 69-79 ◽  
Author(s):  
Andrzej Mastalerz ◽  
Paulina Szyszka ◽  
Weronika Grantham ◽  
Jerzy Sadowski
Keyword(s):  
Performance Analysis ◽  
Body Movement ◽  
Center Of Gravity ◽  
The Body ◽  
Biomechanical Analysis ◽  
Hip Joints ◽  
Factors Affecting ◽  
Analysis System ◽  
Biomechanical Factors

AbstractThe aim of this study was to identify biomechanical factors affecting successful and unsuccessful snatch attempts in elite female weightlifters during the 2013 World Weightlifting Championships. Fourteen female competitors took part in this study. Their successful and unsuccessful snatch lifts with the same load were recorded with 2 camcorders (50 Hz), and selected points were digitized manually on to the body and the barbell using the Ariel Performance Analysis System. The kinetic and kinematic barbell movement as well as the athlete’s body movement variables during the liftoff phase were examined. The results of this study show statistical differences (p ≤ 0.05) between successful and unsuccessful attempts in relation to the angle values in the knee and hip joints in preparation for the aerial phase position. Similarly, the center of gravity velocity was significantly higher in successful attempts during the catch phase. Thus, coaches should pay particular attention to the accuracy of the execution in preparation for the aerial phase position and to the velocity of the center of gravity of the competitors during the catch phase.

scholarly journals Effect of Leg Dominance on The Center-of-Mass Kinematics During an Inside-of-the-Foot Kick in Amateur Soccer Players

2014 ◽  
Vol 42 (1) ◽  
pp. 51-61 ◽  
Author(s):  
Matteo Zago ◽  
Andrea Francesco Motta ◽  
Andrea Mapelli ◽  
Isabella Annoni ◽  
Christel Galvani ◽  
...  
Keyword(s):  
Body Movement ◽  
Center Of Mass ◽  
Three Dimensional ◽  
The Body ◽  
Soccer Players ◽  
Upper Body ◽  
Whole Body ◽  
Movement Velocity ◽  
Ground Support ◽  
Analysis System

Abstract Soccer kicking kinematics has received wide interest in literature. However, while the instep-kick has been broadly studied, only few researchers investigated the inside-of-the-foot kick, which is one of the most frequently performed techniques during games. In particular, little knowledge is available about differences in kinematics when kicking with the preferred and non-preferred leg. A motion analysis system recorded the three-dimensional coordinates of reflective markers placed upon the body of nine amateur soccer players (23.0 ± 2.1 years, BMI 22.2 ± 2.6 kg/m2), who performed 30 pass-kicks each, 15 with the preferred and 15 with the non-preferred leg. We investigated skill kinematics while maintaining a perspective on the complete picture of movement, looking for laterality related differences. The main focus was laid on: anatomical angles, contribution of upper limbs in kick biomechanics, kinematics of the body Center of Mass (CoM), which describes the whole body movement and is related to balance and stability. When kicking with the preferred leg, CoM displacement during the ground-support phase was 13% higher (p<0.001), normalized CoM height was 1.3% lower (p<0.001) and CoM velocity 10% higher (p<0.01); foot and shank velocities were about 5% higher (p<0.01); arms were more abducted (p<0.01); shoulders were rotated more towards the target (p<0.01, 6° mean orientation difference). We concluded that differences in motor control between preferred and non-preferred leg kicks exist, particularly in the movement velocity and upper body kinematics. Coaches can use these results to provide effective instructions to players in the learning process, moving their focus on kicking speed and upper body behavior

Biomechanical Analysis on the Foot under Normal and Abnormal Gait for Orthotics Design

2007 ◽  
Vol 353-358 ◽  
pp. 2179-2182 ◽  
Author(s):  
Jae Ok Lee ◽  
Young Shin Lee ◽  
Se Hoon Lee ◽  
Young Jin Choi ◽  
Soung Ha Park
Keyword(s):  
Gait Analysis ◽  
Human Body ◽  
Center Of Pressure ◽  
Reaction Force ◽  
The Body ◽  
Biomechanical Analysis ◽  
Gait Characteristics ◽  
Abnormal Gait ◽  
Experimental Apparatus ◽  
Analysis System

The foot plays an important role in supporting the body and keeping body balance. An abnormal walking habit breaks the balance of the human body as well as the function of the foot. The foot orthotics which is designed to consider biomechanics effectively distributes the load of the human body on the sole of the foot. In this paper, gait analysis is performed for subjects wearing the orthotics. In this study, three male subjects were selected. The experimental apparatus consists of a plantar pressure analysis system and digital EMG system. The gait characteristics are simulated by ADAMS/LifeMOD. The COP (Center of Pressure), EMG and ground reaction force were investigated. As a result of gait analysis, the path of COP was improved and muscle activities were decreased with orthotics on the abnormal walking subjects.

BIOMECHANICAL ANALYSIS OF CHAIR RISING IN THE PREGNANT WOMEN

2003 ◽  
Vol 15 (04) ◽  
pp. 157-159 ◽  
Author(s):  
PEI-HSI CHOU ◽  
PO-LIN YAO ◽  
YOU-LI CHOU ◽  
JEAN-NNA HONE ◽  
TING-SHENG LIN
Keyword(s):  
Pregnant Women ◽  
Great Influence ◽  
Pregnant Female ◽  
Biomechanical Analysis ◽  
Ankle Joints ◽  
Reaction Forces ◽  
Analysis System ◽  
In The Beginning ◽  
Chair Rise ◽  
Biomechanical Factors

There were so many changes in physiological and psychological aspects during pregnancy. Rising from a chair was an important functional activity of daily life. These changes impose postural demands and limit the performance of activities of daily living. The overall goals of this study were to quantify the effects of physiological change due to pregnancy on the performance of chair-rise and to analyze why some pregnant female have more difficulty with these tasks. Twenty-four pregnant women were included in this study to investigate the performance and possible related biomechanical factors of chair-rise. Body movements of these subjects were recorded using video-based motion analysis system. Three force plates were applied to obtain the ground reaction forces of foot, seat and armrest. Kinematics and kinetics data were analyzed to evaluate the angles and moments of the hip, knee and ankle joints. The result indicated that the maximum moment of the three joints occurred nearly in the beginning of extension phase. As the chair height increased, the maximum flexion angles decreased significantly at the hip, knee, and ankle joints. The chair height had great influence on knee joint and hip joint moments, but less on ankle joint. In the third stage (chair height: 65% KH), the maximum hip moment significantly decreased because of a remarkable increase in abdominal depth. In contrast to the hip moment, the maximum knee moment greatly increased. This result revealed the reason why pregnant female have more difficulty on the performance of chair-rise. Additionally, rising with the armrest for pregnant female would significantly decreased the maximum knee moment. This study suggested that pregnant female should select armrest or higher chair to decrease the joint loading during chair-rise.

Electromyographic Study of Postural Muscles in Various Positions and Movements

1956 ◽  
Vol 186 (1) ◽  
pp. 122-126 ◽  
Author(s):  
Harold Portnoy ◽  
F. Morin
Keyword(s):  
Electrical Activity ◽  
Vertebral Column ◽  
Normal Subjects ◽  
Center Of Gravity ◽  
The Body ◽  
Lateral Flexion ◽  
Trunk Flexion ◽  
Hip Joints ◽  
Flexion And Extension ◽  
Postural Muscles

Electrical activity of ‘postural’ muscles (sacrospinales, hamstrings, gastrocnemii, quadriceps femoris) in normal subjects during different positions and movements of the body varies in different individuals. The sacrospinales become active whenever slight displacements of the center of gravity occur. The sacrospinalis of both sides participate in lateral flexion and extension, and rotation of the vertebral column. In leaning forward, these muscles (except the quadriceps) are working essentially under isometric conditions and their electrical activity is prominent. Stretch, then, appears to be a major factor for the activation of these muscles. In flexion of the trunk, the sacrospinales cease to function at a ‘critical point,’ however, further trunk flexion occurring mainly at the hip joints continues to be accompanied by the activity present in the hamstrings. In more complex movements, such as sitting and standing, the same basic mechanisms related to stretch and displacement of the center of gravity appear to hold true.

Biomechanical Analysis of the Preparatory Motion for Takeoff in the Fosbury Flop

1986 ◽  
Vol 2 (2) ◽  
pp. 66-77 ◽  
Author(s):  
Michiyoshi Ae ◽  
Yukinori Sakatani ◽  
Takashi Yokoi ◽  
Yoshihiro Hashihara ◽  
Kanji Shibukawa
Keyword(s):  
High Speed ◽  
Center Of Gravity ◽  
The Body ◽  
Biomechanical Analysis ◽  
Major Purpose ◽  
3 Dimensional ◽  
Preparatory Phase ◽  
Approach Velocity

The major purpose of this study was to investigate the preparatory motion during the last stride executed by Fosbury-flop jumpers, using 3-dimensional cinematography. Most of the trials for five male high jumpers were filmed at an official track meet by two high-speed cameras. The results suggested that to lower the center of gravity during the preparatory phase, Fosbury-flop jumpers using a curved approach ran resorted to (a) leaning the body toward the center of the curve, and (b) flexing the body. Two types of preparatory motion were classified, and their characteristics were identified concerning the loss of approach velocity and a large and effective takeoff motion.

scholarly journals Correlation between the Anthropometric Measures and Performance of the Cricket Pull Shot- A Case Study of the Malaysian National Batsmen

2018 ◽  
Vol III (I) ◽  
pp. 353-361
Author(s):  
Muhammad Zia Ul Haq ◽  
Muhammad Badar Habib ◽  
Muhammad Nazeer
Keyword(s):  
Performance Analysis ◽  
Body Position ◽  
The Body ◽  
Lower Limbs ◽  
Anthropometric Measures ◽  
Video Cameras ◽  
And Performance ◽  
Analysis System ◽  
The Moment

This study was conducted to examine the correlation between the anthropometric measure and kinematic of pull shot. Eighteen cricket batsmen were recruited for data collection. The variables were recorded as stature, body mass, skinfolds, girths, bone lengths, breadths and physical strengths. The pull shots were recorded with two video cameras and Aerial Performance Analysis System (APAS) software for the kinematic of the pull shot. All kinematic were not significantly correlated with the pull shot performance except the bat angle. It was concluded that the girths and breadths of upper and lower limbs are associated with higher perforamnce of pull shot at the moment of batball contact. The wider arms help to maintain the body position to execute a successful pull shot. The extension of the knee, hip and elbows assist batsmen to keep body position against the short of length ball for an accurate pull shot.

scholarly journals The Influence of Biofeedback in Postural Rehabilitation of Athletes

2021 ◽  
Vol 66 (1) ◽  
pp. 101-110
Author(s):  
Hajnal Chelaru ◽  
Codruța Florina Bulduş ◽  
Dan Monea
Keyword(s):  
Weight Distribution ◽  
Body Position ◽  
Center Of Gravity ◽  
The Body ◽  
Lower Limbs ◽  
Biofeedback Treatment ◽  
Postural System ◽  
Analysis System ◽  
The Right ◽  
Postural Analysis

"ABSTRACT. Background. A balanced posture allows sports movements PERFORMANCE with optimal consumption of energy and minimal stress on the musculoskeletal system with of the technology offered by the posturograph, we can identify the center of gravity deviations, the points of support, the load, the weight distribution in the soles, the anterior posteriorized or compressed posture, the asymmetries of the body. by an interpretation in biomechanical context, any compensations or decompensations can be identified. Aim. The aim of the study is to improve posture through biofeedback treatment using the GPS 600 device. Materials. The Posturograph or Global Postural System (GPS) is an advanced postural analysis system that uses techniques and methods of noninvasive diagnosis and evaluation in the field of medical recovery. Posturography includes 2 diagnostic units and software. Methods. We used the following methods: bibliographic study methods, method of observation, measurement method, experimental method, statistical method. Applied treatments. The treatments for re-educating the posture with the GPS 600 device took place for 2 weeks. During the treatment, the subjects had to maintain their body position / posture as indicated by the device. Results. From the 12 athletes, the anteriority of the head improved, the center of gravity, loading on the right and left lower limbs. At the end of the 2 weeks, the athletes reached a perfect balance of the center of gravity and the weight distribution on the lower limbs. Conclusion. Biofeedback treatments with the GPS 600 device help to improve POSTURE and maintain the results over time."

scholarly journals Biomechanical analyses of the performance of Paralympians: from foundation to elite level

2012 ◽  
Vol 36 (3) ◽  
pp. 380-395 ◽  
Author(s):  
Sarah A Curran ◽  
Laurent Frossard
Keyword(s):  
Performance Analysis ◽  
Three Dimensional ◽  
The Body ◽  
Biomechanical Analysis ◽  
Sports Performance ◽  
London 2012 ◽  
Elite Level ◽  
Complexity Constraints ◽  
User Friendly

A biomechanical analysis of sports performance provides an objective method of determining performance of a particular sporting technique. In particular, it aims to add to the understanding of the mechanisms influencing performance, characterization of athletes and provide insights into injury predisposition. While the performance in sport of able-bodied athletes is well recognized in the literature, less information and understanding are known on the complexity, constraints and demands placed on the body of an individual with a disability. This article provides a dialogue that outlines scientific issues of the performance analysis of multi-level athletes with a disability, including Paralympians. Four integrated themes are explored, the first of which focuses on how biomechanics can contribute to the understanding of sports performance in athletes with a disability and how it may be used as an evidence-based tool. This latter point questions the potential for a possible cultural shift led by the emergence of user-friendly instruments. The second theme briefly discusses the role of reliability of sports performance and addresses the debate of two-dimensional and three-dimensional analyses. The third theme addresses key biomechanical parameters and provides guidance to clinicians and coaches on the approaches adopted using the biomechanical/sports performance analysis for an athlete with a disability starting out, to the emerging and elite Paralympian. For completeness of this discourse, the final theme is based on the controversial issues on the role of assisted devices, and the inclusion of Paralympians into able-bodied sport. All combined, this dialogue highlights the intricate relationship between biomechanics and training of individuals with a disability. Furthermore, it illustrates the complexity of modern training of athletes, which can only lead to a better appreciation of the performances to be delivered in the London 2012 Paralympic Games. Clinical relevance Biomechanical analysis can play a fundamental role in optimizing the performance of an athlete with a disability. Clinicians should be aware and understand the mechanisms that may influence performance and have an appreciation of the factors that may predispose such athletes to injury.

Deadlift Recognition and Application based on Multiple Modalities using Recurrent Neural Network

2020 ◽  
Vol 2020 (17) ◽  
pp. 2-1-2-6
Author(s):  
Shih-Wei Sun ◽  
Ting-Chen Mou ◽  
Pao-Chi Chang
Keyword(s):  
Neural Network ◽  
Recurrent Neural Network ◽  
Network Structure ◽  
Inertial Sensors ◽  
Body Movement ◽  
The Body ◽  
Body Parts ◽  
Multimodal Sensing ◽  
Multiple Devices ◽  
Neural Network Structure

To improve the workout efficiency and to provide the body movement suggestions to users in a “smart gym” environment, we propose to use a depth camera for capturing a user’s body parts and mount multiple inertial sensors on the body parts of a user to generate deadlift behavior models generated by a recurrent neural network structure. The contribution of this paper is trifold: 1) The multimodal sensing signals obtained from multiple devices are fused for generating the deadlift behavior classifiers, 2) the recurrent neural network structure can analyze the information from the synchronized skeletal and inertial sensing data, and 3) a Vaplab dataset is generated for evaluating the deadlift behaviors recognizing capability in the proposed method.

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