Kai Kobayashi

ORCID: 0000-0003-4524-284X
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About
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Research Areas
  • Sports Performance and Training
  • Lower Extremity Biomechanics and Pathologies
  • Reproductive tract infections research
  • Sports injuries and prevention
  • Blood groups and transfusion
  • Winter Sports Injuries and Performance
  • Sports Dynamics and Biomechanics
  • Herpesvirus Infections and Treatments
  • Plant Pathogenic Bacteria Studies
  • Shoulder Injury and Treatment
  • Genital Health and Disease
  • Parasite Biology and Host Interactions
  • Microbial infections and disease research
  • Non-Destructive Testing Techniques
  • Magnetic Field Sensors Techniques
  • Data Visualization and Analytics
  • Enterobacteriaceae and Cronobacter Research
  • Video Analysis and Summarization
  • Pneumonia and Respiratory Infections
  • Human Pose and Action Recognition
  • Magnetic Bearings and Levitation Dynamics
  • Parasitic infections in humans and animals
  • Animal Behavior and Welfare Studies
  • Syphilis Diagnosis and Treatment
  • Microbial Metabolism and Applications

Toyo University
2023-2025

Tokyo Metropolitan Institute of Public Health
2020-2024

Tokyo Keizai University
2019

Nippon Veterinary and Life Science University
2011

Waseda University
2008-2009

To elucidate the relationship between muscularity of individual lower-limb muscles and 100-m-race time (t100) in young-adult male sprinters.Thirty-one sprinters took part this study (age 19.9 ± 1.4 y, height 173.5 4.6 cm, body mass 67.0 4.9 kg, t100 10.23-11.71 s). Cross-sectional images from origin to insertion 12 were obtained with via magnetic resonance imaging (MRI). The absolute volume each muscle, ratio total measured mass, muscle 2 volumes calculated as indices using images. A...

10.1123/ijspp.2016-0703 article EN International Journal of Sports Physiology and Performance 2017-06-12

Abstract We aimed to examine the validity of estimating spatiotemporal and ground reaction force (GRF) parameters during resisted sprinting using a robotic loading device (1080 Sprint). Twelve male athletes (age: 20.9 ± 2.2 years; height: 174.6 4.2 cm; weight: 69.4 6.1 kg; means SDs) performed maximal with three different loads device. The step frequency length step‐averaged velocity, anteroposterior GRF ( F ap ), ratio resultant (RF) were estimated velocity towing data measured...

10.1111/sms.14597 article EN Scandinavian Journal of Medicine and Science in Sports 2024-03-01

Mycoplasma genitalium has a tendency to develop macrolide and quinolone resistance.We investigated the microbiological cure rate of 7 day course sitafloxacin for treatment rectal urogenital infections in MSM.This open-label, prospective cohort study was conducted at National Center Global Health Medicine, Tokyo, Japan from January 2019 August 2022. Patients with M. or were included. The patients treated 200 mg daily days. isolates tested parC, gyrA 23S rRNA resistance-associated mutations.In...

10.1093/jac/dkad208 article EN cc-by-nc Journal of Antimicrobial Chemotherapy 2023-06-28

We aimed to clarify how the horizontal force-velocity ( Fvh ) relationship during over-ground sprint running differs with resistance loads and profiling methods (multiple- single-trial methods). Twelve males performed (one unresisted five resisted) using a motorized loading device. During trials, ground reaction forces at every step were obtained 50-m force plate system. The step-averaged relationships then determined single- multiple-trial linear curvilinear models. differences in...

10.1249/mss.0000000000003629 article EN Medicine & Science in Sports & Exercise 2025-01-06

Phytobacter diazotrophicus is an Enterobacterales species that was originally identified as a plant growth-promoting, Gram-negative bacterium. Recently, this has been recognized relevant to opportunistic human and nosocomial infections in clinical settings. Its frequent misidentification other from examination occasionally causes delay the identification of outbreaks. Here, we report emergence New Delhi metallo-β-lactamase (NDM)-producing P. isolated hospitalized pediatric patients hospital...

10.1128/msphere.00147-23 article EN cc-by mSphere 2023-07-14

Several Chlamydia trachomatis lineages identified through outer membrane protein A genotyping or multilocus sequence typing have been circulating worldwide among men who sex with men. In a study in Tokyo, Japan, we demonstrate that such commonly belong to specific polymorphic E clade across genotypes.

10.3201/eid3010.240852 article EN cc-by Emerging infectious diseases 2024-09-25

Abstract Background Mycoplasma genitalium, which causes sexually transmitted diseases, is increasingly resistant to key antibiotics such as macrolides and quinolones, posing a challenge for treatment. Objectives To assess the effectiveness of prolonged sitafloxacin doxycycline combination therapy new alternative treatment strategy highly drug-resistant M. genitalium strains Methods A prospective cohort study was conducted at National Center Global Health Medicine, Tokyo, Japan, from 1...

10.1093/jac/dkae403 article EN Journal of Antimicrobial Chemotherapy 2024-11-05

This study aimed to elucidate the influence of horizontal resistance loads on spatiotemporal and ground reaction force (GRF) variables during maximal sprint acceleration. Nine male sprinters (20.2 ± 1.2 years; 175.3 4.5 cm, 69.7 6.1 kg) performed sprint-running with six loading conditions one unresisted five resisted 4, 6, 8, 10, 12 kg using a training device intelligent drag technology. During trials, GRFs for all steps were determined 50-m plate system. The GRF at running velocity every...

10.1371/journal.pone.0295758 article EN cc-by PLoS ONE 2023-12-12

Streptococcus suis is a gram-positive bacterium that causes meningitis, septicemia, endocarditis, and other disorders in pigs humans. We obtained 42 50 S. isolates from lesions of porcine endocarditis palatine tonsils, respectively, clinically healthy Japan; we then determined their sequence types (STs) by multilocus typing (MLST), cps genotypes, serotypes, presence classical major virulence-associated marker genes (mrp, epf, sly). The were assigned to limited number STs clonal complexes...

10.1186/s13567-024-01270-5 article EN cc-by Veterinary Research 2024-02-06

We investigated the effects of resistance exercise combined with essential amino acid supplementation on psoas major muscle (PMM) hypertrophy and walking ability in elderly individuals. Twenty-nine healthy individuals were assigned to 3 groups: (1) E (exercise), (2) A3 (exercise 3.0 g supplementation), (3) A6 6.0 supplementation). To evaluate ability, participants underwent following types tests: 10-meter walk (10-W), involving crossing obstacles (10-W + O), 6-minute (6M-W) tests. The...

10.1556/aphysiol.100.2013.008 article EN Acta Physiologica Hungarica 2013-05-17

To investigate the relationship between fascicle behavior and joint torque, of triceps surae during isometric eccentric (30 60 deg/s) plantar flexion by maximal voluntary submaximal electrical activation (MVA SEA) was measured real-time ultrasonography. Eccentric torque at 30 deg/s significantly higher than under SEA, but not MVA. However, length did differ trials either condition. Therefore, difference in developed MVA SEA cannot be explained behavior. Under both conditions, equivalent....

10.1123/jab.25.2.111 article EN Journal of Applied Biomechanics 2009-05-01

Purpose.This study investigated the relationship between subjective effort (SE) and kinematics/kinetics throughout an entire 50 m sprint.Methods.Fifteen male sprinters performed sprint at 3 different levels of SE (100 %SE; maximal-effort, 90 %SE 80 %SE, sub-maximal efforts).Kinematic kinetic data were obtained with a digital high speed camera ground reaction force (GRF) plates placed every 1 in running lane.Variables recorded time, speed, step frequency, length, aerial contact GRF, impulse...

10.14198/jhse.2020.151.06 article EN cc-by-nc-nd Journal of Human Sport and Exercise 2019-01-01

Chiba, Y, Sato, K, Yoshimoto, T, Ohnuma, H, Yamanaka, R, Takahashi, Kobayashi, Matsubayashi, and Takai, Y. Revamping pace distribution: A case study on elevating the men's 400 m track field Japanese national record after 32 years. J Strength Cond Res XX(X): 000-000, 2024-Many studies have investigated 400-m sprint, optimal pacing strategy is subject to debate. Little information available regarding effects of changes in running speed spatiotemporal variables official race. This analyzed a...

10.1519/jsc.0000000000005032 article EN PubMed 2024-12-19

10.1299/jsmemecj.2024.j232-04 article EN The Proceedings of Mechanical Engineering Congress Japan 2024-01-01

Due to the long parturition period of raccoons, we assumed that age at first conception late born females was later than early females. From March 2005 September 2008, 201 estimated be younger 24 months were separated into early- and late-born groups on basis their birth month (to nearest 2 months), parous status body mass index (BMI) examined. Age (over 18 old) early-born 12 old). The average BMI in individuals old might have affected ability conceive because fat deposition.

10.1292/jvms.11-0410 article EN cc-by-nc-nd Journal of Veterinary Medical Science 2011-12-14

Abstract Background The prevalence of resistant strains Mycoplasma genitalium has increased over the past few decades, leading to limited treatment options. This study aimed evaluate efficacy sitafloxacin and doxycycline combination therapy as a salvage for refractory rectal urogenital M. infections. Methods Men who have sex with men (MSM) diagnosed infection from urine samples or swabs using PCR assay were evaluated administered 200 mg daily 21 days. Each sample was tested 23rRNA, parC,...

10.1093/ofid/ofad500.2273 article EN cc-by Open Forum Infectious Diseases 2023-11-27

In the present study, an ergometer (SErg) was developed to determine force-velocity-power relationship in sprint running and examine its applicability for assessing sprinting ability on ground. The SErg consisted of a low friction belt, rotary encoder, force transducer attached runner's waist, electrical brake belt. subjects (nine healthy active men, including two sprinters: age, 22.6±2.1yrs; body height, 175.3±4.1cm; weight, 74.1±9.3 kg) sprinted with maximal effort at five loads that were...

10.5432/ijshs.6.85 article EN International Journal of Sport and Health Science 2008-01-01

<sec> <title>BACKGROUND</title> &lt;i&gt;Mycoplasma genitalium&lt;/i&gt; is an emerging sexually transmitted pathogen associated with increasing antibiotic resistance. The current treatment guidelines recommend moxifloxacin-sequential therapy for macrolide-resistant &lt;i&gt;M&lt;/i&gt; &lt;i&gt;genitalium&lt;/i&gt; or strains unknown resistance profiles. However, it unclear whether sitafloxacin, a 4th-generation fluoroquinolone antibiotic, effective against resistant strains. </sec>...

10.2196/preprints.52565 preprint EN 2023-09-08

Mycoplasma genitalium is an emerging sexually transmitted pathogen associated with increasing antibiotic resistance. The current treatment guidelines recommend moxifloxacin-sequential therapy for macrolide-resistant Mgenitalium or strains unknown resistance profiles. However, it unclear whether sitafloxacin, a 4th-generation fluoroquinolone antibiotic, effective against resistant strains.This study aims to assess and compare the efficacy safety of sitafloxacin- moxifloxacin-based regimens...

10.2196/52565 article EN cc-by JMIR Research Protocols 2023-10-24
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