A5076167789- Sports Performance and Training
- Sports injuries and prevention
- Muscle activation and electromyography studies
- Lower Extremity Biomechanics and Pathologies
- Exercise and Physiological Responses
- Motor Control and Adaptation
- Foot and Ankle Surgery
- Diabetic Foot Ulcer Assessment and Management
- Musculoskeletal pain and rehabilitation
- Cardiovascular and exercise physiology
- Children's Physical and Motor Development
- Occupational Health and Performance
- Sports Dynamics and Biomechanics
- Cardiovascular Effects of Exercise
- Diversity and Impact of Dance
- Ergonomics and Musculoskeletal Disorders
- Tendon Structure and Treatment
- Winter Sports Injuries and Performance
- Body Composition Measurement Techniques
- Obesity, Physical Activity, Diet
- Transcranial Magnetic Stimulation Studies
- Balance, Gait, and Falls Prevention
- Cerebral Palsy and Movement Disorders
- Advanced Sensor and Energy Harvesting Materials
- Flow Experience in Various Fields
Ritsumeikan University
2018-2025
Loughborough University
2017-2025
In-Q-Tel
2024
National Institute of Fitness and Sports in Kanoya
2013-2023
Kokushikan University
2022-2023
University of Maryland, Baltimore
2022
Japan Society for the Promotion of Science
2013-2018
Waseda University
2015-2018
Edith Cowan University
2014-2015
This study aimed to investigate the differences in muscle volumes and strength between male elite sprinters, sub-elite untrained controls assess relationships of with sprint performance.Five sprinters (100-m season's best equivalent [SBE100], 10.10 ± 0.07 s), 26 (SBE100, 10.80 0.30 11 control participants underwent 1) 3-T magnetic resonance imaging scans determine volume 23 individual lower limb muscles/compartments 5 functional groups 2) isometric assessment body groups.Total muscularity...
Abstract Objective. High-density surface electromyography (HD-sEMG) allows the reliable identification of individual motor unit (MU) action potentials. Despite accuracy in decomposition, there is a large variability number identified MUs across individuals and exerted forces. Here we present systematic investigation anatomical neural factors that determine this variability. Approach . We investigated influence on HD-sEMG such as synchronization MU discharges, distribution territories,...
It is unclear whether the superiority of eccentric over concentric training on neuromuscular improvements due to higher torque (mechanical loading) achievable during contractions or resulting greater total work.This study aimed examine adaptations after maximal versus matched for work.Twelve males conducted single-joint isokinetic (180°·s) knee extensors in one leg (ECC-leg) and other (CON-leg), 6 sets per session (3-5 initial 1-3 sessions), 2 sessions week 10 wk. The preceding performed...
This study examined the difference in intra-abdominal pressure (IAP) between abdominal bracing and hollowing relation to trunk muscular activities. IAP with a transducer placed rectum surface electromyograms for rectus abdominis, external oblique, internal erector spinae during 2 tasks were obtained 7 young adult men. The at rest its peak value (ΔIAPmax) showed high intra- inter-day repeatability, was significantly greater (116.4±15.0 mmHg) than (9.9±4.5 mmHg). activities ΔIAPmax higher...
We investigated the effects of seated versus prone leg curl training on hamstrings muscle hypertrophy and susceptibility to eccentric exercise-induced damage.Part 1: Twenty healthy adults conducted with one (Seated-Leg) other (Prone-Leg), at 70% one-repetition maximum (1RM), 10 repetitions per set, 5 sets session, 2 sessions week for 12 wk. Magnetic resonance imaging (MRI)-measured volume individual whole was assessed pre- posttraining. Part 2: Nineteen participants from part 1 another...
We tested a hypothesis that low-load squat training with slow movement and tonic force generation (LST) would increase muscle size strength but not necessarily power. Healthy young men were assigned to LST [50% one-repetition maximum (1-RM) load, 3 s for lowering/lifting without pause: n=9] or normal speed (LN: 50% 1-RM 1 1-s pause; n=7) groups. Both groups underwent an 8-week program (10 repetitions/set, sets/day, days/week) using the methods. Before after intervention, quadriceps femoris...
This study examined localization of muscle damage within the quadriceps femoris induced by different types eccentric exercises using transverse relaxation time (T2 )-weighted magnetic resonance imaging (MRI). Thirty-three young males performed either following three exercises: single-joint contraction knee extensors (KE), squat (S), or downhill walking (DW) (n=11/exercise). KE and S consisted 5-set×10-lowering 90% one-repetition maximum load. DW was for 60 minutes with -10% slope, 6 km/h...
The size of the plantar intrinsic and extrinsic foot muscles has been shown to be associated with toe flexor strength (TFS). Previous studies adopted limited or a compartment containing several as an independent variable for TFS. Among muscles, therefore, it is unclear which muscle(s) primarily contributes TFS production. present study aimed clarify this subject.In 17 young adult men, series anatomical cross-sectional area individual was obtained along length lower leg length, respectively,...
The present study aimed to examine the effect of short-term training utilizing voluntary co-contraction with maximal efforts. 23 healthy young men (training group: TG, n=13; control CG, n=10) participated in this study. TG conducted a 4-week program (3 days/week), which consisted 4s simultaneous contractions elbow flexors and extensors at 90°of joint, followed by muscle relaxation (10 repetitions/set, 5 sets/day). Before after intervention, isometric isokinetic torques thicknesses were...
In a large sample of long-term resistance-trained individuals, we showed greater maximal M-wave amplitude the elbow flexors and knee extensors compared with untrained which appears to be at least partially mediated by differences in muscle size. The lack group voluntary EMG when normalized suggests that morphology might impair interpretation as an index central neural activity.
The biarticular triceps brachii long head (TBLong) is lengthened more in the overhead than neutral arm position. We compared hypertrophy after elbow extension training performed vs. Using a cable machine, 21 adults conducted extensions (90-0°) with one (Overhead-Arm) and other (Neutral-Arm) position at 70% one-repetition maximum (1RM), 10 reps/set, 5 sets/session, 2 sessions/week for 12 weeks. Training load was gradually increased (+5% 1RM/session) when preceding session completed without...
Because of the biophysical relation between muscle fibre diameter and propagation velocity action potentials along fibres, motor unit conduction could be a non-invasive index size in humans. However, has been only assessed indirectly animal models human patients with invasive intramuscular EMG recordings, or it mathematically derived from computer simulations. By combining advanced techniques to record activity vivo, i.e. high-density surface EMG, gold standard technique for tissue sampling,...
ABSTRACT Introduction The hamstring muscles play a crucial role in sprint running but are also highly susceptible to strain injuries, particularly within the biceps femoris long head (BFlh). This study compared adaptations muscle size and strength of knee flexors, as well BFlh aponeurosis size, after two eccentrically focused flexion training regimes: Nordic (NHT) vs lengthened state eccentric (LSET, isoinertial weight stack resistance an accentuated hip-flexed position) habitual activity...
Antagonistic muscle pairs cannot be fully activated simultaneously, even with maximal effort, under conditions of voluntary co-contraction, and their muscular activity levels are always below those during agonist contraction effort (MVE). Whether the level task has trainability remains unclear. The present study examined this issue by comparing co-contraction for highly experienced bodybuilders, who frequently perform in training programs, that untrained individuals (nonathletes)....
This study aimed to clarify the characteristics of muscle activities during push-up exercises performed under sling condition by comparison with those ground condition. We hypothesized that sling-based push-ups induce higher than ground-based push-ups, and its effects are more prominent in dynamic compared static exercise owing increased demands stabilization. Twenty young males sling- each (maintaining posture elbow joint angle at 90 deg) (repeating a rate 45 per minute) exercises. Surface...
We investigated localization of damage within the knee extensors (KEs) and plantar flexors (PFs) induced by downhill running (DR) using transverse relaxation time (T2)-weighted magnetic resonance imaging (MRI). Fourteen young adults performed 45-min DR (-15% slope) at their maximal tolerable velocity. At pre- 24, 48, 72 h post-exercise, T2-MRI was scanned T2 values for each muscle composing KEs PFs proximal, middle, distal sites were calculated. Maximal isometric torque rate development...
Mountain trekking involves level, uphill, and downhill walking (DW). Prolonged DW induces damage to leg muscles, reducing force generating ability muscle coordination. These increase risks for more serious injuries accidents in mountain trekking, thus a strategy minimize is warranted. It has been shown that low-intensity eccentric contractions confer protective effect on induced by high-intensity contractions. This study tested the hypothesis 5-min non-damaging would attenuate 40-min DW, but...
This study investigated effects of downhill (DR) versus level (LR) running training on various muscular and aerobic performances. Eighteen healthy young males conducted either DR (DR group (DRG), n = 10: –10% slope) or LR (LR (LRG), 8) at a target heart rate (HR) associated with lactate threshold (LT) for 20 min·session −1 , 3 sessions·week 5 weeks. Before after the interventions, following variables were measured: knee extension torque (–150, –30, 0, 30, 150°·s ), leg power (simultaneous...
This study examined muscular adaptations of knee extensors following short-term low-frequency downhill walking training. 22 young males (training group: TG, n=12; control CG, n=10) participated. TG conducted 40-min treadmill (load: 10% body mass, gradient: 28%, velocity: 5 km/h) 1 session/week for 4 weeks. Before and after the intervention, muscle thickness maximal extension torques in eccentric (− 120, − 60, 30°/s), isometric (0°/s), concentric (30, 240°/s) conditions were measured. For...