Sentaro Koshida

SBC Tokyo Medical University

Objectives: The coordination of glenohumeral (GH) and scapular movements is central to the injury prevention of baseball pitchers. However, there is no objective data establishing the direct relationship between pitching injuries and associated GH and scapular movements. Therefore, this study demonstrated the biomechanical differences in the scapul...

Neck stabilisation during a breakfall, in response to a judo throw, may play a crucial role in preventing direct contact between the participant’s head and the judo mat. Therefore, neck strength may predict the risk of judo-related head injuries. However, the precise association between neck strength and neck stabilisation during breakfalls remains...

Coordination of glenohumeral and scapular movements plays an important role in the injury prevention of baseball pitchers. However, there is no objective data establishing the direct relationship between pitching injuries and associated glenohumeral and scapular movements. Therefore, the objectives of the present study were to demonstrate biomechan...

The purpose of the present study was to compare the biomechanics parameters of seoi-nage in judo between highly skilled judo athletes and skilled ones. The motion data of the seoi-nage were collected on three male elite judo athletes and sixteen male student judo athletes using a three-dimensional motion analysis technique. This study found that th...

The incidence of head injuries in novice judo practitioners is of increasing public concern in Japan. This study investigated the correlation between trunk biomechanics and judorelated head injury risk in novice judokas with the aim of developing effective injury prevention strategies. Thirty-one novice judokas volunteered to participate the study....

The purpose of the present study was to compare the biomechanics parameters of seoi-nage between a skilled group and an unskilled group. The motion data of the seoi-nage were collected on three male elite judo athletes and sixteen male student judo athletes using a three-dimensional motion analysis technique. Groups based on skill level were compar...

[Purpose] Lack of exercise means the number of children likely to develop musculoskeletal diseases will rise. Our objective was to assess the current situation of children's exercise in Chiba. [Subjects and Methods] Some 336 children participated in a sports event. They performed seven exercise items and completed a questionnaire. We examined the r...

The objective of this study was to demonstrate three-dimensional neck kinematics during breakfall motion for osoto-gari and to elucidate its association between neck strength in novice judokas. Twenty-one novice judokas volunteered to participate in this study. The Motion data was collected using a three-dimensional motion analysis technique. We fo...

The purposes of the present study were to compare the biomechanics parameters of seoi-nage between elite and college judo athletes and to produce the standard motion models of elite and college judo athletes. The motion data of the seoi-nage were collected on three male elite judo athletes and nine male student judo athletes using a three-dimension...

It is generally accepted that proper learning of the breakfall technique during early judo training is essential for attenuating the risk of judo-related head injury. Therefore, it is critical to understand the kinematics and head injury risks of breakfall motion to design a more safe and effective judo teaching paradigm that results in reduction o...

Awareness of the risk and incidence of injury during the breakfall movement may lead to a perceived fear, which could be detrimental to breakfall kinematics and may even increase the risk of judo-related head injuries. Therefore, our aim was to investigate the association between the perceived fear of the breakfall movement and breakfall kinematics...

The purpose of this study was to investigate kinematics of the whole body centre of mass (COM) in seoi-nags performed by elite and collegiate women judo athletes. Three-dimensional coordinate data were captured using a Vicon-Mx system with 18 cameras operating at 250 Hz as 3 women elite judo athletes and 6 women college level judo athletes performe...

Previous studies suggest that increasing the skill level of judokas will decrease the number of head injuries sustained during judo. However, the kinematics are poorly understood, making it difficult to establish an effective breakfall teaching programme. Therefore, we studied the kinematic parameters of breakfall for osoto-gari to identify the ris...

Background and Study Aim: Head injuries sustained during the sport of judo have gained significant public attention because of the incidence of severe cases among novice judokas in Japan. The judo backward breakfall skill may play an important role in decreasing the number of head injuries. Therefore, more effective ways to acquire appropriate judo...

The purpose of this study was to identify kinematic parameters of breakfall for osoto-gari that can be distinguished between the experienced and the novice judokas. Eight experienced and four novice judukas volunteered to participate in the study. The motion data of the breakfall for osoto-gari were collected with a three-dimensional motion analysi...

The objectives of this study were to quantify the contribution of joint motion to dynamic knee valgus and to classify dynamic knee valgus alignment during single-leg jump landing motion in young female basketball players according to the dominant joint motion. Participants were 64 young female basketball players (age 16.1 ± 0.7 years, body mass 58....

Background and Study Aim: Joint coordination patterns during sports movements are believed to be related to sports performance and injury risk. The aim of our study was to quantify the joint coordination of the knee and ankle during the kendo strike-thrust motion and identify patterns among uninjured, experienced kendo athletes. Material and Metho...

2 The purpose of this study was to demonstrate the neck and trunk angle time curves as well as electromyographic (EMG) activities during a judo backward breakfall in both experienced and novice judokas. Six experienced and four novice judokas volunteered to participate in the study. Three-dimensional kinematic and EMG data were collected while part...

2 The purpose of this study was to demonstrate the neck and trunk angle time curves as well as electromyographic (EMG) activities during a judo backward breakfall in both experienced and novice judokas. Six experienced and four novice judokas volunteered to participate in the study. Three-dimensional kinematic and EMG data were collected while part...

2 The purpose of this study was to demonstrate the neck and trunk angle time curves as well as electromyographic (EMG) activities during a judo backward breakfall in both experienced and novice judokas. Six experienced and four novice judokas volunteered to participate in the study. Three-dimensional kinematic and EMG data were collected while part...

2 The purpose of this study was to demonstrate the neck and trunk angle time curves as well as electromyographic (EMG) activities during a judo backward breakfall in both experienced and novice judokas. Six experienced and four novice judokas volunteered to participate in the study. Three-dimensional kinematic and EMG data were collected while part...

2 The purpose of this study was to demonstrate the neck and trunk angle time curves as well as electromyographic (EMG) activities during a judo backward breakfall in both experienced and novice judokas. Six experienced and four novice judokas volunteered to participate in the study. Three-dimensional kinematic and EMG data were collected while part...

[Purpose] the purpose of this study was to clarify postural control and muscle activity of the gluteus medius and musculus erector spinae in a single-leg stance before and after hip muscle abductor fatigue. [Subjects] Subjects were 22 healthy male adults (mean age; 21.4 yrs) with no significant medical history or current medical problems. [Methods]...

The aim of this study was to demonstrate the kinematics and kinetics of the lower extremity during the kendo strike-thrust motion in experienced kendo athletes. Fifteen experienced kendo athletes (age 20.4±1.2 years; height 171.5±4 cm; weight 73.9±9.1 kg; the kendo experience 11.1±3.1 years) volunteered to participate in the study. The three-dimens...

The mechanisms of anterior cruciate ligament (ACL) injuries are still inconclusive from an epidemiological standpoint. An epidemiological approach in a large sample group over an appropriate period of years will be necessary to enhance the current knowledge of the ACL injury mechanism. The objective of the study was to investigate the ACL injury oc...

Because a majority of throwing injuries occur near the maximum external rotation (MER) of the throwing shoulder, sports medicine practitioners and researchers have paid special attention to the shoulder kinematics at the MER in throwing. However, little is known about the individual kinematics of the glenohumeral, scapulothoracic, and thoracic join...

The purpose of this study was to identify the angles of the shoulder complex which consist of glenohumeral joint, scapulothracic joint, and thoracic joint at the maximum external rotation (MER) of the shoulder complex during throwing in baseball players, and to analyze the correlation of each angle. The subjects were 19 collegiate baseball players....

From a clinical viewpoint, a greater number of ACL injuries have been observed involving the left knee than the right knee; however, the evidence is still limited. The purpose of the first study in this two-part investigation was to demonstrate whether laterality of ACL injury exists in various sports activities, including alpine skiing. We hypothe...

Although high prevalence of anterior cruciate ligament injuries (ACL) in judokas has been reported, there has been very little research concerning events preceding the injury. To determine the common situations and mechanisms of ACL injury in judo. A total of 43 cases of ACL injuries that had occurred during judo competition or practice were invest...

From a clinical viewpoint, a greater number of ACL injuries have been observed involving the left knee than the right knee; however, the evidence is still limited. The purpose of the first study in this two-part investigation was to demonstrate whether laterality of ACL injury exists in various sports activities, including alpine skiing. We hypothe...

Previous studies have suggested that resistance training exercise under unstable conditions decreases the isometric force output, yet little is known about its influence on muscular outputs during dynamic movement. The objective of this study was to investigate the effect of an unstable condition on power, force, and velocity outputs during the ben...

The purpose of this study was to clarify whether changes in BMI were associated with physical fitness improvements in youth after a one-year period. The subjects were 287 youth male students aged between 15 and 18. A physical fitness test was conducted using the new physical fitness test with 8 items for youth aged between 12 and 19 years, develope...

The objective of the present study was to examine whether the passive range of shoulder external rotation (ER), the maximum shoulder external rotation angle (MER) during throwing, and the ratio of MER to ER are related to the incidence of the elbow injury. A mixed design with one between-factor (a history of the elbow injury) and two within-factors...

The amount of stress imposed on shoulder and elbow appears to be directly correlated with the degree of maximum shoulder external rotation (MER) during throwing motions. Therefore, identifying risk factors contributing to the increase of MER angle may help to decrease the throwing injuries occurrence in baseball players. The purpose of the present...

The purpose of the study was to demonstrate the relationships between peak power output, rate of power development (RPD) and maximal strength in the bench press movement with free weights. Eighteen healthy male subjects volunteered to participate in the study (mean age 21.1±1.4year, standing height 169.9±6.5cm, body mass (BM) 75.6±16.8kg). All subj...

Anterior cruciate ligament (ACL) is the first restraint against anterior tibial translation (ATT) in the knee joint. Previous studies suggested that knee joint laxity might be increased by the repeated stress imposed on the knee joint. The purpose of this study was to demonstrate the effect of the repeated soccer ball kicking actions on the ATT in...

Results The results showed that accidents were occurred on the intermediate courses (56%), advanced courses (28%), or novice courses (16%). The � 2 test revealed a significant association between the level of expertise and course incline (p

METHOD: Nine collegiate judoists were recruited as LBP group in this study (4 males and 5 females, mean age 20.9±0.9y, mean judo grade: 1.9±0.3). In order to be inclueded as the LBP group, subjects had to experience LBP within six months before the experiment with persistent or recurrent symptoms over twelve weeks. Subjects in the LBP group also ha...

甲第4568号 広島大学(Hiroshima University) 博士(保健学) doctoral Hygiene