Issei Ogasawara

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Verified

Issei verified their affiliation via an institutional email.

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• Ph.D.
• Professor (Assistant) at Osaka University

ABSTRACT Introduction: Shoulder joint motion involves coordinated movements between joints, but few studies have investigated the dynamic inter-joint movement pattern during arm elevation. This study aimed to investigate the effect of arm elevation speed on the inter-joint coordination of the shoulder joint complex during abduction, with a particul...

Pareidolias refer to visual perceptual deficits where ambiguous shapes take on meaningful appearances. In neurodegenerative diseases, pareidolias are examined via a paper-based neuropsychological tool called the noise pareidolia test. In this study, we present initial findings regarding the utilization of pareidolia test on a digital format to anal...

Wearable devices are increasingly utilized to monitor physical activity and sedentary behaviors. Accurately determining wear/non-wear time is complicated by zero counts, where the acceleration-based indexes do not estimate activity intensity, often leading to misclassifications. We propose a novel synthetic classification algorithm that leverages b...

Purpose] This study investigated differences in the convergence mode of post-step sway between young and older adults using a step-down task to identify fall causes in older adults and assess consecutive postural adjustments. [Participants and Methods] This study included 15 young and 15 older adults (nine females and six males in each group). The...

The deterministic condition demonstrated why the rearfoot strike more frequently caused the combined knee VL+IR moment. Once a sports practitioner acquires this concept, they may be able to design a suitable foot strike technique during cutting or landing that can limit the GRF vector’s directional probability for causing the combined knee VL + IR...

Pareidolias are illusionary phenomena wherein ambiguous forms appear meaningful. In clinical research, pareidolias have been studied using paper or desktop test formats to deconstruct visuo-perceptual mechanisms. Translating this work on to an accessible, scalable setup such as smartphones is currently unknown. Here, we designed a smartphone-based...

Introduction: This study aimed to clarify the relationship between psychological factors (goal orientation and desire for approval from others) and the severity of sports injuries experienced by young Japanese athletes. Methods: 560 young Japanese athletes (males = 328 and females = 232) aged 18–24 years completed an online survey in 2022–2023. A w...

Background: Anterior cruciate ligament injury frequently occurs in the deceleration with the knee-extended position. In addition, a rapid hip internal rotation is concomitantly observed. However, how the extended knee position induces the hip internal rotation is unclear. Methods: Sixteen healthy participants performed the simulated foot impact...

Background Asymmetry in knee joint kinematics during running after anterior cruciate ligament reconstruction (ACLR) could indicate insufficient recovery of knee functions and might lead to re-injury or secondary knee osteoarthritis. We developed ‘Modified Drop Squat’ (MDS) exercise to assess and improve the asymmetry of knee kinematics during runni...

This short-term survey examined the effect of body part pain on subjective and objective handball performance in Japanese male national handball athletes. Fourteen athletes participated in this study. Assessments of pain in 10 body parts and subjective performance (concentration and satisfaction with body movement) were performed using a visual ana...

Pareidolias refer to visual perceptual deficits where ambiguous shapes take on meaningful appearances. In neurodegenerative diseases, pareidolias are examined via a paper-based neuropsychological tool called the noise pareidolia test. In this study, we present initial findings regarding the utilization of pareidolia test on a digital format to anal...

Tennis is a popular leisure sport, and studies have indicated that playing tennis regularly provides many health benefits. We aimed to clarify the characteristics of physical activity during beginner-level group tennis lessons and daily physical activity of the participants. Physical activity was measured using an accelerometer sensor device for fo...

Abstract Background Combined knee valgus and tibial internal rotation (VL + IR) moments have been shown to stress the anterior cruciate ligament (ACL) in several in vitro cadaveric studies. To utilize this knowledge for non-contact ACL injury prevention in sports, it is necessary to elucidate how the ground reaction force (GRF) acting point (cente...

Background: Precise postural control helps prevent anterior cruciate ligament injury. However, it is unknown whether the anticipated postural stability can be improved during a physically uncertain and cognitively demanding task. Hypothesis: Anticipated postural stability will improve through unanticipated single-leg landing with a rapid foot plac...

Introduction: With the widespread use of wearable sensors, various methods to evaluate external physical loads using acceleration signals measured by inertial sensors in sporting activities have been proposed. Acceleration-derived external physical loads have been evaluated as a simple indicator, such as the mean or cumulative values of the target...

Tennis is a popular leisure sport, and studies have indicated that playing tennis regularly provides many health benefits. We aimed to clarify the characteristics of physical activity during beginner– level group tennis lessons and daily physical activity of the participants. Physical activity was measured using an accelerometer sensor device for f...

Motion sensors are widely used for gait analysis. The validity of commercial gait analysis systems is of great interest because calculating position/angle-level gait parameters potentially produces an error in the integration process of the motion sensor data; moreover, the validity of ORPHE ANALYTICS, a motion-sensor-based gait analysis system, ha...

This study aimed to explore the single-legged landing kinematics that could lead to increase or decrease in the risk of anterior cruciate ligament (ACL) injury. Immediate pre-impact kinematics at the single-legged landing from 33 healthy young female handball players were evaluated. Thereafter, two-year follow-up for ACL injury incidence was conduc...

The ground reaction force (GRF) is known to produce tibial internal rotation loading associated with the stress in the anterior cruciate ligament (ACL). However, it is unclear whether the friction moment (FM; the moment due to horizontal shoe-floor friction, acting around the vertical axis at the GRF acting point) facilitates or restrains the effec...

Background Motion sensors are widely used for gait analysis. ORPHE ANALYTICS is a motion-sensor-based gait analysis system. The validity of commercial gait analysis systems is of great interest to clinicians because calculating position/angle-level gait parameters using motion sensor data potentially produces an error in the integration process; mo...

PURPOSE: Research utilizing goal orientations in physical activity has consistently found that task orientation (i.e., self-referenced personal definition of success based on personal effort and improvement) is associated with adaptive psychological responses (Biddle, et al., 2003). Last year, in response to risks associated with lack of exercise d...

Background Meniscal extrusion/translation has been used as an index for meniscal treatment. However, the relationship between meniscal displacement and the degree of meniscal tear or load–transmission function of the lateral meniscus (LM) remains unclear. Purpose To clarify the relationship between the width of the radial tear of the LM and (1) me...

Sportswear-type wearables with integrated inertial sensors and electrocardiogram (ECG) electrodes have been commercially developed. We evaluated the feasibility of using a sportswear-type wearable with integrated inertial sensors and electrocardiogram (ECG) electrodes for evaluating exercise intensity within a controlled laboratory setting. Six mal...

Anterior cruciate ligament (ACL) injury occurs soon after foot-strike. Cutting with a shallow flexed knee is considered a risk factor for ACL injury; however, how foot-strike patterns (forefoot strike [FFS] vs. rearfoot strike [RFS]) affect sagittal plane knee kinetics and kinematics after a foot-strike, is unknown. This study aimed to investigate...

This study investigated the changes in physical inactivity of university students during the COVID-19 pandemic, with reference to their academic calendar. We used the daily step counts recorded by a smartphone application (iPhone Health App) from April 2020 to January 2021 (287 days) for 603 participants. The data for 287 days were divided into fiv...

Coronavirus disease 2019 (COVID-19) is still prevalent in the world. Social distancing is more important during exercise because we may not be able to wear masks to avoid breathing problems, heatstroke, etc. For supporting management of social distancing, we are developing a human localization system using a single camera especially for sports scho...

Sportswear-type wearables with integrated inertial sensors and electrocardiogram (ECG) electrodes, have been developed. We examined the feasibility of using sportswear-type wearables to evaluate exercise intensity within a controlled laboratory setting. Six male college athletes were asked to wear a sportswear-type wearable while performing a tread...

The Coronavirus disease 2019 (COVID-19) is still prevalent in the world. Exercise is important to maintain our health while dealing with infectious diseases. Social distancing is more important during exercise because we may not be able to wear masks to avoid breathing problems, heatstroke, etc. To maintain social distancing during exercise, we dev...

Sportswear-type wearables with integrated inertial sensors and electrocardiogram (ECG) electrodes, have been developed. We examined the feasibility of using sportswear-type wearables to evaluate exercise intensity within a controlled laboratory setting. Six male college athletes were asked to don a sportswear-type wearable while performing a treadm...

This study investigated the changes in physical inactivity of university students during the COVID-19 pandemic, with reference to their academic calendar. We used the daily step counts recorded by a smartphone application (iPhone Health App) from April 2020 to January 2021 (287 days) for 603 students. The data for 287 days were divided into five pe...

Objectives: Runner’s dystonia is a task-specific dystonia that occurs in the lower limbs and trunk, with diverse symptomatology. We aimed to identify the origin of a dystonic movement abnormality using combined three-dimensional kinematic analysis and electromyographic (EMG) assessment during treadmill running. Participant: A 20-year-old female run...

Background Biomechanical factors affecting horizontal-plane hip and knee kinetic chain and anterior cruciate ligament (ACL) injury risk during cutting maneuvers remain unclear. This study aimed to examine whether different foot strike patterns alter horizontal-plane hip and knee kinetics and kinematics during a cutting maneuver in female athletes a...

This study aimed to compare the physical activity (PA) measured by a wearable sensor device (WSD) and the step count measurement, and to investigate the association between PAs and lifestyle. Data of 301 participants were collected from March 2019 to March 2021. Step counts, sedentary behavior, performance time of light/moderate/vigorous PA, METs ×...

Anterior cruciate ligament (ACL) injury occurs soon after foot-strike. Cutting with a shallow flexed knee is considered a risk factor for ACL injury; however, how foot-strike patterns (forefoot strike [FFS] vs. rearfoot strike [RFS]) affect sagittal plane knee kinetics and kinematics after a foot-strike, is unknown. This study aimed to investigate...

Purpose The inside-out meniscal repair is widely performed to preserve the function of meniscus. In this technique, the outer suture is passed through the capsule as well as the outer meniscus, while the inner suture is inserted into the meniscus. The aim of this study was to biomechanically compare the suture stability between meniscus-meniscus an...

‘Yips’ in golf is a complex spectrum of anxiety and movement-disorder that affects competitive sporting performance. With unclear etiology and high prevalence documented in western literature, the perception and management of this psycho-neuromuscular problem among Japanese elite golfers is unknown. The objective of this study was to explore factor...

Objectives: Runner's dystonia is a task specific dystonia that occurs in the lower limbs and trunk, with diverse symptomatology. We aimed to identify the origin of a dystonic movement abnormality using combined three-dimensional kinematic analysis and electromyographic (EMG) assessment during treadmill running. Participant: A twenty-year-old female...

The COVID-19 pandemic has negatively impacted sporting activities across the world. However, practical training strategies for athletes to reduce the risk of infection during the pandemic have not been definitively studied. The purpose of this report was to provide an overview of the challenges we encountered during the reboot of high-performance s...

Purpose Biomechanical factors affecting horizontal-plane hip and knee kinetic-chain and anterior cruciate ligament (ACL) injury risks during cutting maneuvers remains unclear. This study aimed to examine whether different foot strike patterns alter horizontal-plane hip and knee kinetics and kinematics during a cutting maneuver in female athletes an...

Background: Yips in golf is a complex spectrum of psychological anxiety and movement disorder that affects sporting performance. Existing literature is limited to several western studies and the manifestations of this problem in Japanese golfers is currently unknown. Objectives: To quantify self-reported perception and manifestation of yips among J...

Background The COVID-19 pandemic has negatively impacted sporting activities across the world. However, practical training strategies for athletes to reduce the risk of infection during the pandemic has not been definitively studied. Objective The purpose of this report was to provide an overview of our challenges encountered during the reboot of h...

This study aimed to validate a simple dynamic model of single-leg drop-landing to develop a methodological foundation for investigating mechanistic causes of anterior cruciate ligament (ACL) injury and to explore mechanical associations between knee valgus torque and landing kinematics that are considered clinically as a high-risk landing posture f...

‘Yips’ is an involuntary movement disorder seen in some professional golfers. The diagnostic challenge in yips is to distinguish symptoms of task-specific dystonia from psychological ‘choking’. We hypothesized that in mild-yips golfers, the yips-like shots demonstrate features that are distinguishable from normal-shots allowing for an objective cla...

In various fields, data recorded continuously during a time interval and curve data, such as spectral data, become common. These kinds of data can be interpreted as functional data. In this paper we have studied binary classification from only positive and unlabeled functional data (PU classification for functional data). Our first contribution is...

'Yips' is an involuntary movement disorder seen in some professional golfers. The diagnostic challenge in yips is to distinguish symptoms of task-specific dystonia from psychological 'choking'. We evaluated 15 professional golfers with mild symptomatic yips via anxiety tests, motion-capture and surface electromyography during a 'putting' task. Move...

Background: Anterior cruciate ligament (ACL) injury often occurs during deceleration maneuvers in sports. Combined knee valgus and tibial internal rotation (VL + IR) moments have been recognized as a risk leading to ACL injury; however, it is unknown how the foot strike pattern (forefoot or rearfoot strike) affects the occurrence rate of the afore...

Medicine & Science in Sports & Exercise: June 2019 - Volume 51 - Issue 6S - p 259-260

Medicine & Science in Sports & Exercise: May 2018 - Volume 50 - Issue 5S - p 813

Ballet dancers have to perform their movements, especially with arms to express emotion or a role on the stage. Although the movement with their arms to express artistic or emotional impression might be difficult to master, no study has examined the 3-dimensional biomechanical characteristics of upper limb movements of ballet dancers. So, the purpo...

All living tissues and cells on Earth are subject to gravitational acceleration, but no reports have verified whether acceleration mode influences bone formation and healing. Therefore, this study was to compare the effects of two acceleration modes, vibration and constant (centrifugal) accelerations, on bone formation and healing in the trunk usin...

Radiographic images of all fractured-ribs in divided 5 groups. Control (vibration), low-magnitude and high-magnitude acceleration groups in the vibration acceleration study, and control (constant) and centrifuge acceleration groups in the constant acceleration study. Low: low-magnitude acceleration group, High: high-magnitude acceleration group, Ce...

CT images (MPR slice) of all ectopic bone divided 5 groups. Control (vibration), low-magnitude and high-magnitude acceleration groups in the vibration acceleration study, and control (constant) and centrifuge acceleration groups in the constant acceleration study. Low: low-magnitude acceleration group, High: high-magnitude acceleration group, Centr...

Since the loss of balance can result in falls or lower extremity injuries during sports or daily activities, quantitative evaluation of one’s ability to maintain balance with changes in the direction of motion is crucial. The present study aimed to assess whether the trajectory length of the center of pressure (COP) and peak values of the ground re...

Dynamic balance was evaluated using the trajectory length of the center of foot pressure (COP) in the early phase from immediately after landing to the time of pastoral maintenance. Ten young volunteers with an average age of 23.8 years were asked to stand on one foot on a horizontal floor, hop forward half a step and land on one foot 10 times on e...

Med Sci Sports Exerc, 44(5), s545, 2012

The objective of this study was to design an orthosis during the exercise of walking in water for the rehabilitation of ACL injury. In the rehabilitation of ACL injury, it is necessary to train the muscles around the knee joint. In particular, compared to the knee flexors, the knee extensors are less exerted in the normal walking form while walking...

The objective of this study was to design an orthosis during the exercise of walking in water for the rehabilitation of ACL injury. In the rehabilitation of ACL injury, it is necessary to train the muscles around the knee joint. In particular, compared to the knee flexors, the knee extensors are less exerted in the normal walking form while walking...

Med Sci Sports Exerc, 43(5), s639

The objective of this study was to propose walking in water for ACL injury rehabilitation program by simulation. For this Objective, the simulator which can compute the body load considering the fluid force and force acting on the ACL was utilized. The optimal walking forms for three rehabilitation phases were then computed by the simulation. From...

The purpose of this study was to increase knowledge about the landing posture that induces anterior cruciate ligament (ACL) injury. Analysis was done to determine the knee abduction moment during single limb landing using our previously proposed mathematical model. Our model has proven that the criterion of knee abduction occurring is when the acti...

The objective of this study was to propose the walking in water for ACL injury rehabilitation program by simulation. For this objective, the simulator which can compute the body load considering the fluid force and force acting on the ACL was utilized. The optimal walking forms for three rehabilitation phases were then computed by the simulation. F...

Med Sci Sports Exerc, 42(5), s486, 2010.

We proposed a statics-based model to predict knee adduction/abduction moment, which is a major mechanism of anterior cruciate ligament (ACL) injury. Our model neglects the dynamic terms of equation of motion because, at the time of ACL injury, the moment of ground reaction force (GRF) is much more dominant than the moment caused by shank's inertia...

The aim of this study is to examine the potential of the two-dimensional posture evaluation method as a screening tool for detecting the high-risk population for anterior cruciate ligament injury.Eleven healthy adults participated in this study. They jumped from a 31 cm-high box and landed on their dominant leg. Three-dimensional knee flexion/exten...

The higher anterior cruciate ligament (ACL) injury rate of females is one of the most sever athletic-related problems today. The purpose of this study is to compare the lower extremity kinematics between male and female during single leg landing. Six male and four female healthy subjects participated in this study. They jumped from a 32 cm high box...