Kojiro Ishii

Biographic Data

ID6841864
NAMEKojiro Ishii
GIVEN NAMESKojiro
FAMILY NAMEIshii
SIGNATUREISHII K
AFFILIATIONSDoshisha University
ORCID0000-0002-3310-9470
VERIFIEDYes
TOTAL WORKS9
TOTAL CITATIONS2
WORKS AS AUTHOR9
WORKS AS EDITOR0
FIRST PUBLICATION YEAR2008
LATEST PUBLICATION YEAR2026
H-INDEX1

  • Operational margin of high-school tennis tournaments under heat constraints

    Open AccessHiroki Yamaguchi, Takaaki Mori et al.ARTICLEFrontiers in Sports and Active…2026

    Introduction Environmental heat indices such as wet-bulb globe temperature (WBGT) does not directly indicate whether a tournament schedule can be completed. Therefore, in this study, we aimed to translate WBGT-based environmental conditions into operational indicators relevant to tournament management and evaluate the effects of tournament scheduling and timing on tennis tournament feasibility. Methods In this observational study, WBGT data (Apri…

  • Sleep debt and depressive symptoms among workers

    Open AccessChie Omichi, Yukiyoshi Sumi et al.ARTICLEFrontiers in Public Health2026

    Introduction This study examined whether fatigue mediates the association between sleep debt and depressive symptoms among municipal employees in Japan. Methods This cross-sectional study was conducted as part of the Night in Japan Home Sleep Monitoring Study (NinJaSleep Study) between November 2023 and March 2024 among 1,435 municipal employees in Koka City, Japan. Sleep debt was quantified using the Sleep Debt Index, calculated from self-report…

  • Reliability and Validity of the HBSC Physical Activity Questionnaire in Japanese Adolescents

    Open AccessChiaki Tanaka, Masashi Watanabe et al.ARTICLEChildren2025

    Background/Objectives : International physical activity (PA) questionnaires require a reliability and validity assessment in many countries to understand cross-cultural differences accurately. The current study examined the reliability and validity of the Japanese version of the WHO Health Behaviour in School-aged Children PA (HBSC-J) survey in adolescent students in Japan. Methods : The participants were 215 Japanese high school students. The HB…

  • Relative age effect on the physical activity and sedentary behavior in children and adolescents aged 10 to 18 years old

    Open AccessTakaaki Mori, Takumi Aoki et al.ARTICLEBMC Public Health2024

    The relative age effect on physical activity can persist after middle school, and the relatively younger individuals are more likely to replace physical activity with sedentary behavior

  • Neighborhood Socioeconomic Characteristics Associated with the Covid-19 Incidence in Elementary School Children

    Open AccessKan Oishi, Takaaki Mori et al.ARTICLEChildren2023

    We aimed to determine whether neighborhood socioeconomic characteristics are associated with the coronavirus disease 2019 (COVID-19) incidence in elementary school children and, if so, the associated characteristics. We obtained data on the number of infected children from 282 public elementary schools and the socioeconomic characteristics of each school district in Osaka City, Japan. We examined associations between these variables through negat…

  • Neighborhood-level socioeconomic factors moderate the association between physical activity and relative age effect

    Open AccessTakaaki Mori, Takumi Aoki et al.ARTICLEBMC Public Health2022

    Socioeconomic factors moderate the relative age effect on adolescents' physical activity. The relative age effect on adolescents' physical activity might be more likely to appear among adolescents from socioeconomically disadvantaged neighborhoods

  • Association of Neighborhood Food Environment and Physical Activity Environment With Obesity

    Open AccessKan Oishi, Takumi Aoki et al.ARTICLEINQUIRY The Journal of Health…2021

    Objective: This study examined the relationship between neighborhood food and physical activity environment, and obesity among elementary and junior high school students in Japan. Methods: The participants were fifth- to ninth-grade children (n=7277), who were attending municipal schools in Japan. Percent overweight (POW) was calculated using their age, gender, height, and weight, which were collected through a questionnaire. A POW of Results: In…

  • Appendicular muscle mass and exercise/sports participation history in young Japanese women

    Open AccessMakoto Ayabe, Hideaki Kumahara et al.ARTICLEAnnals of Human Biology2019

    Background: It remains unclear how past exercise habits can affect the skeletal muscle mass in adulthood in Japanese populations. Aim: The purpose of the present investigation was to examine the association of appendicular muscle mass (AMM) and skeletal muscle mass index (SMI) with the history of exercise and/or physical activity participation in Japanese women. Subjects and methods: One hundred and twenty females, aged between 18 and 28 years ol…

  • Accuracy of Spring-levered and Piezo-electric Pedometers in Primary School Japanese Children

    Open AccessSatoshi Nakae, Yoshitake Oshima et al.ARTICLEJournal of PHYSIOLOGICAL…2008Cited by: 2

    Pedometers are used in many studies because physical activities can be simply assessed using them. In addition to the spring-levered type, piezo-electric pedometers have recently been used. However, their accuracy in children has not been investigated in previous studies. In this study, we investigated the accuracy of spring-levered pedometer and piezo-electric pedometer step counts in comparison with hand-tallied step counts with children during…