A5060807610- Musculoskeletal pain and rehabilitation
- Sports injuries and prevention
- Automotive and Human Injury Biomechanics
- Spine and Intervertebral Disc Pathology
- Shoulder Injury and Treatment
- Muscle activation and electromyography studies
- Sports Performance and Training
- Lower Extremity Biomechanics and Pathologies
- Transportation Safety and Impact Analysis
- Occupational Health and Performance
- Medical Imaging and Analysis
- Ergonomics and Musculoskeletal Disorders
- Spinal Fractures and Fixation Techniques
- Balance, Gait, and Falls Prevention
- Motor Control and Adaptation
- Shoulder and Clavicle Injuries
- Myofascial pain diagnosis and treatment
- Foot and Ankle Surgery
- Injury Epidemiology and Prevention
- Cardiovascular Effects of Exercise
- Cervical and Thoracic Myelopathy
- Sports Dynamics and Biomechanics
- Traumatic Brain Injury Research
- Mechanics and Biomechanics Studies
- Agriculture and Farm Safety
Waseda University
2016-2025
Japan Sport Council
2020-2022
Institute for Community Living
2020
Teikyo University
2016
Tokyo Institute of Technology
2009
University of Tsukuba
1998-2008
Japan Automobile Research Institute
1997-2007
Japan Community Healthcare Organization
2002
Tokyo Teishin Hospital
1999-2000
Study Design Controlled laboratory study. Objectives To clarify whether differences in surface stability influence trunk muscle activity. Background Lumbar stabilization exercises on unstable surfaces are performed widely. One perceived advantage performing is the potential for increased muscular demand. However, there little evidence literature to help establish this assumption correct. Methods Nine healthy male subjects lumbar exercises. Pairs of intramuscular fine-wire or electrodes were...
Study Design. The motion of each cervical vertebra during simulated rear-end car collisions was analyzed. Objectives. To clarify the mechanism zygapophysial joint injury whiplash loading. Summary Background Data. is suspected origin neck pain after collision. However, no studies have been conducted on mechanisms injuries. Methods. Ten healthy male volunteers participated in this study. Subjects sat a sled that glided backward inclined rails and crashed into damper at 4 km/hr. spine recorded...
Twelve male volunteers participated in this study. They sat on a seat mounted newly developed sled that simulated actual car impact acceleration. Impact speeds (4, 6 and 8 km/h), stiffness, neck muscle tension, cervical spine alignment were selected for the parameter study of head-neck-torso kinematics responses. The motion patterns vertebrae crash normal compared. Subject's muscles relaxed state did not affect upon rear-end impact. ramping-up subject's torso was observed due to seatback...
Background Several studies have reported that physical loading related to competitive sports activities is associated with lumbar intervertebral disk degeneration. However, the association between types of and degeneration has not been clarified. Hypothesis The frequencies may vary sport because different postures actions specific each sport. Study Design Cross-sectional study (prevalence); Level evidence, 3. Methods participants were 308 well-trained university athletes (baseball players,...
Study Design Experimental laboratory study. Objectives To measure trunk muscle activity using wire electrodes during lumbar stabilization exercises and to examine if more effective activate the deep muscles (local muscles) exist. Background Lumbar are performed improve motor control of muscles. However, magnitude activation local is not clear. Methods Nine healthy men with no history spine disorders participated in Fine-wire were inserted into transversus abdominis (TrA) multifidus,...
Background Injury and illness surveillance in the aquatic disciplines has been conducted during FINA World Championships Olympic Games. The development of an aquatic-specific injury system will improve quality data collected preventive measures. Our ultimate objective is to enhance athlete health performance. Objective was refine protocols develop definitions illness; define location causation; better describe overuse injuries; regard pre-existing recurrent more accurately exposures a...
In Brief Study Design. Retrospective multi-institutional study Objective. To describe the surgical outcomes in patients with ossification of posterior longitudinal ligament thoracic spine (T-OPLL) and to clarify factors related outcomes. Summary Background Data. Detailed analyses T-OPLL have been difficult because rarity this disease. Methods. The subjects were 154 who surgically treated at 34 institutions between 1998 2002. procedures laminectomy 36, laminoplasty 51, anterior decompression...
Purpose Polymorphic variation in the angiotensin-converting enzyme (ACE) and α-actinin-3 (ACTN3) genes has been reported to be associated with endurance and/or power-related human performance. Our aim was investigate whether polymorphisms ACE ACTN3 are elite swimmer status Caucasian East Asian populations. Methods I/D R577X genotyping carried out for 200 swimmers from European, Commonwealth, Russian, American cohorts (short middle distance, ≤400 m, n = 130; long >400 70) 326 Japanese...
Low back pain is a significant problem not only for the adult, but also during youth. However, relationship between low youth and duration or types of competitive sports has been clarified.Low associated with sports.Cross-sectional study; Level evidence, 4.Study participants were 4667 new university students who, from 2004 to 2006, answered questionnaire concerning their participation in sports. The divided into "no" group (NO), middle (MID), high (HI) based on answers analyzed using...
The majority of orthopaedic problems experienced by competitive swimmers are related to pain in the shoulder, low back, and knee. Three 39 national swim team members were hampered their performance due lumbar disk herniation at an international competition 2001. There has been no previous research into degeneration elite swimmers.Excessive swimming activities accelerate degeneration.Case control study; Level evidence, 3.Fifty-six (high-load group, 35 men 21 women; mean age, 19.6 years) a...
Background: Pelvic tilting is performed to improve lumbopelvic flexibility or retrain the motor control of local muscles. However, few studies investigated activity muscles during pelvic tilting. Purpose: The purpose this study was investigate muscle anterior and posterior Method: Twelve healthy males (age, 22.6 ± 1.4 years) participated. Fine-wire electrodes were inserted into bilateral lumbar multifidus (MF) transversus abdominis (TrA). Surface used record rectus abdominis, external...
This study investigated muscle synergy during smash shot in badminton and compared synergies of advanced players (more than 7 years experience) beginner (less 3 experience). The dominant hand all was the right side. Muscle activities were recorded on both sides rectus abdominis, external oblique (EO), internal oblique/transversus abdominis (IO/TrA), erector spinae. Additionally, side biceps brachii, triceps flexor carpi radialis, ulnaris, digitorum profundus recorded. All data obtained using...
The forearm muscles coordinately control wrist motion, and their activity is affected by rotation. Although rotation has been implicated in the development of lateral medial epicondylitis, its biomechanical background remains unknown. Therefore, present study investigated various positions. Surface electromyography extensor carpi radialis brevis, ulnaris, flexor radialis, ulnaris was performed on 40 healthy upper limbs. We initially measured muscle strength electromyographic (integrated...
The present study was performed to evaluate the effects of physical exercise at altitudes on serum vascular endothelial growth factor (VEGF) levels. Eight subjects underwent intensive swimming training for 21 days 1886 m. After altitude commenced, red blood cell (RBC) counts and erythropoietin levels increased, but both haemoglobin haematocrit did not change significantly. level VEGF, measured by means a highly sensitive chemiluminescence (ELISA), showed transient decrease 10 after start...
Abstract This study aimed to investigate whether muscle synergy differs between swimmers with and without swimmer's shoulder in the butterfly technique. Muscle synergies, which can assess coordination, were analyzed using surface electromyography. Twenty elite included this (swimmer's shoulder: n = 8; control: 12). The motions involved executing technique classified into early pull-through, late recovery phases. data nonnegative matrix factorization method compared two groups. swimming...
During competitive diving, divers jump up from 1 to 3 m springboards or 5 10 platforms and dive into the water. The impact forces are very large in water entry phase, and, as such, microtraumatic injuries common due tremendous physical stress placed on diver. Low-back pain (LBP) is most frequently reported symptom divers. This study aimed extract possible risk factors related LBP technical characteristics Japanese elite junior divers.Eighty-three (42 men 41 women) Japan were included this...
The nordic hamstring exercise (NHE) is a dynamic lengthening that requires trunk and hip muscles activation. Thigh activation, specifically hamstring/quadriceps contractions has been previously examined during NHE. Trunk activity have not enough studied. aim of this study was to analyze Surface electromyography (EMG) kinematic data were collected Ten healthy men with the age range 21–36 years performed two sets repetitions downward upward motions each EMG fifteen knee collected. Muscle...
Despite proposals and guidelines to prevent baseball injuries in young players by societies organizations, many shoulder elbow continue occur among junior high school players. In order investigate the training conditions of risk factors for pain players, we conducted a questionnaire survey throughout country.The was September 2016.A total 11,134 belonging 495 teams responded survey. Among these, 4004 trained every day week 1151 played games month with no off-season. 9752 who did not have...
Improving the performance of underwater undulatory swimming (UUS) improves time, so it is important to identify pattern muscle coordination in swimmers with fast UUS. This study aimed muscular trunk and lower limb during UUS elite swimmers. Nine (aged 20 ± 2 years; height, 1.74 0.03 m; weight, 73.0 4.4 kg) participated this study. Measurements were taken by electromyography eight muscles: rectus abdominis (RA), internal abdominal (IO), femoris (RF), erector spinae (ES), multifidus (MF),...