Faculty Profiles - MATSUMOTO Naomi

Papers - MATSUMOTO Naomi

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Breastfeeding at 6 months of age had a positive impact on overweight and obesity in Japanese adolescents at 15 years of age Reviewed

Tomoka Kadowaki, Naomi Matsumoto, Etsuji Suzuki, Toshiharu Mitsuhashi, Soshi Takao, Takashi Yorifuji

Acta Paediatrica 112 ( 1 ) 106 - 114 2022.9

Association of nighttime sleep with behaviors in Japanese early childhood Reviewed International journal

Yusuke Yamauchi, Soshi Takao, Naomi Matsumoto, Takashi Yorifuji

Pediatrics International 64 ( 1 ) e15354 2022.9

Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

BACKGROUND: Preschool children in Asian countries, including Japan, sleep for a shorter duration at night than those in Europe and the USA. We examined the effects of the nighttime sleep duration on behavioral development in early childhood in Japan. METHODS: We used data from a large Japanese nationwide, population-based, longitudinal survey that began in 2001. We restricted the study participants to children born after 37 gestational weeks, with a birth weight ≥ 2500 g and singleton births (n = 41 890). The nighttime sleep duration was examined at 2.5 years old. Responses to survey questions regarding age-appropriate behavior at 5.5 years old were used as indicators of behavioral development. We conducted logistic regression analyses with adjustment for confounding factors, with ≥11 h of nighttime sleep as the reference group. RESULTS: The odds ratios for children who had ≤9 h of nighttime sleep, which was associated with being unable to listen with fidgeting and being unable to remain patient, were 1.26 (95% confidence interval, 1.14-1.39) and 1.27 (1.16-1.38), respectively. Children who had an irregular nighttime sleep duration were associated with age-appropriate behavioral inabilities. These results were similar in children who usually and sometimes took naps to those before stratification by the frequency of napping. CONCLUSION: A short nighttime sleep duration especially affects hyperactivity and impulsivity. An irregular nighttime sleep duration increases the inability to perform overall age-appropriate behaviors more than a short sleep duration. Ensuring a regular and sufficient nighttime sleep duration in early childhood is important for healthy behavioral development.

DOI： 10.1111/ped.15354

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Timing of REGEN-COV administration and progression to severe COVID-19

Tomoka Kadowaki, Sato Imajou, Naomi Matsumoto, Soshi Takao, Takashi Yorifuji

Journal of Infection and Chemotherapy 28 ( 11 ) 1459 - 1463 2022.7

Effect of mRNA Vaccines in Preventing COVID-19 Severe Pneumonia Among COVID-19 Patients in Japan Reviewed

Rumi Matsuo, Naomi Matsumoto, Tomoka Kadowaki, Toshiharu Mitsuhashi, Soshi Takao, Takashi Yorifuji

Journal of Epidemiology 32 ( 3 ) 151 - 152 2022.3

Questionnaire Survey on COVID-19 Vaccination at Okayama University in Japan: Factors Promoting Vaccination Among Young Adults Reviewed

Chigusa Higuchi, Naomi Matsumoto, Yoshiaki Iwasaki, Takashi Yorifuji, Junichiro Yamazaki, Yasutomo Nasu, Hirofumi Makino

Journal of Disaster Research 17 ( 1 ) 21 - 30 2022.1

Publishing type：Research paper (scientific journal) Publisher：Fuji Technology Press Ltd.

COVID-19 has been prevalent worldwide since 2019. Increasing COVID-19 vaccination coverage is an important measure to combat the disease. An online survey was conducted with university students and personnel who were vaccinated against COVID-19 at a mass vaccination event to examine the factors promoting vaccination among young adults. The online survey was conducted with persons vaccinated at Okayama University from June 5 to September 27, 2021. Although the number of those who had fever >37.5°C increased after the second vaccination compared to the first, the vaccinated persons got more satisfied after the second shot.

DOI： 10.20965/jdr.2022.p0021

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Current Insights into Atopic March Reviewed International journal

Mitsuru Tsuge, Masanori Ikeda, Naomi Matsumoto, Takashi Yorifuji, Hirokazu Tsukahara

Children 8 ( 11 ) 1067 - 1067 2021.11

Language：English Publishing type：Research paper (scientific journal) Publisher：MDPI AG

The incidence of allergic diseases is increasing, and research on their epidemiology, pathophysiology, and the prevention of onset is urgently needed. The onset of allergic disease begins in infancy with atopic dermatitis and food allergy and develops into allergic asthma and allergic rhinitis in childhood; the process is defined as “atopic march”. Atopic march is caused by multiple immunological pathways, including allergen exposure, environmental pollutants, skin barrier dysfunction, type 2 inflammation, and oxidative stress, which promote the progression of atopic march. Using recent evidence, herein, we explain the involvement of allergic inflammatory conditions and oxidative stress in the process of atopic march, its epidemiology, and methods for prevention of onset.

DOI： 10.3390/children8111067

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Sports participation and preterm birth: a nationwide birth cohort in Japan Reviewed International journal

Kei Tamai, Naomi Matsumoto, Akihito Takeuchi, Makoto Nakamura, Kazue Nakamura, Misao Kageyama, Yosuke Washio, Hirokazu Tsukahara, Takashi Yorifuji

Pediatric Research 92 ( 2 ) 572 - 579 2021.10

Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

BACKGROUND: Children born preterm may be less physically active than children born term because of neurocognitive problems, reduced lung function, and poor physical fitness. We evaluated sports participation of children and adolescents who had been born preterm (<37 weeks) and early term (37-38 weeks) in 2001. METHODS: Data from a nationwide longitudinal survey (n = 47,015, including 2375 children born preterm) were analyzed. As indicators of sports participation, we used responses to questions about participation in sports clubs at 7 and 10 years old and in extracurricular school sports at 15 years old. RESULTS: Children born very preterm (25-31 weeks) and moderately to late preterm (32-36 weeks) were less likely to participate in sports clubs at 7, 10, and 15 years old than children born full term (39-41 weeks). Compared with children born full term, the adjusted risk ratios for participation in extracurricular school sports at 15 years old were 0.86 (95% confidence interval: 0.75-0.98) for children born very preterm, 0.92 (0.88-0.97) for children born moderately to late preterm, and 1.00 (0.98-1.02) for children born early term. CONCLUSIONS: Our findings suggest that preterm birth is associated with less participation in organized sports during childhood and adolescence than full-term birth. IMPACT: Research investigating associations between preterm birth and physical activity among children born in the 2000s is limited. This study shows that preterm birth was associated with less participation in organized sports during childhood and adolescence than full-term birth, especially in boys, and the participation in organized sports of children born preterm decreased as gestation shortened. During childhood, boys born early term were also less likely to participate in organized sports than boys born full term, suggesting a continuum with preterm births. These findings offer important additional insights into the limited evidence available for predicting future health outcomes for preterm infants.

DOI： 10.1038/s41390-021-01808-9

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Other Link： https://www.nature.com/articles/s41390-021-01808-9

Preterm birth and Kawasaki disease: a nationwide Japanese population-based study. Reviewed International journal

Akihito Takeuchi, Takahiro Namba, Naomi Matsumoto, Kei Tamai, Kazue Nakamura, Makoto Nakamura, Misao Kageyama, Toshihide Kubo, Hirokazu Tsukahara, Takashi Yorifuji

Pediatric research 92 ( 2 ) 557 - 562 2021.10

Language：English Publishing type：Research paper (scientific journal)

BACKGROUND: Previous studies showed that preterm birth increased the risk for hospital admissions in infancy and childhood due to some acute diseases. However, the risk of preterm children developing Kawasaki disease remains unknown. In the present study, we investigate whether preterm birth increased the morbidity of Kawasaki disease. METHODS: We included 36,885 (34,880 term and 2005 preterm) children born in 2010 in Japan. We examined the association between preterm birth and hospitalization due to Kawasaki disease using a large nationwide survey in Japan. RESULTS: In log-linear regression models that were adjusted for children's characteristics (sex, singleton birth, and parity), parental characteristics (maternal age, maternal smoking, paternal smoking, maternal education, and paternal income), and residential area, preterm infants were more likely to be hospitalized due to Kawasaki disease (adjusted risk ratio: 1·55, 95% confidence interval: 1.01-2.39). We then examined whether breastfeeding status modified the potential adverse effects of preterm birth on health outcome. Preterm infants with partial breastfeeding or formula feeding had a significantly higher risk of hospitalization due to Kawasaki disease compared with term infants with exclusive breastfeeding. CONCLUSIONS: Preterm infants were at a high risk for Kawasaki disease, and exclusive breastfeeding might prevent this disease among preterm infants. IMPACT: Previous studies showed that preterm birth increased the risk for hospital admissions in infancy and childhood due to some acute diseases, however, the risk of preterm children developing Kawasaki disease remains unknown. This Japanese large population-based study showed that preterm infants were at a high risk for Kawasaki disease for the first time. Furthermore, this study suggested that exclusively breastfeeding might prevent Kawasaki disease among preterm infants.

DOI： 10.1038/s41390-021-01780-4

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Short or Irregular Sleep Duration in Early Childhood Increases Risk of Injury for Primary School-Age Children: A Nationwide Longitudinal Birth Cohort in Japan Reviewed International journal

Takafumi Obara, Hiromichi Naito, Kohei Tsukahara, Naomi Matsumoto, Hirotsugu Yamamoto, Takashi Yorifuji, Atsunori Nakao

International Journal of Environmental Research and Public Health 18 ( 18 ) 9512 - 9512 2021.9

Language：English Publishing type：Research paper (scientific journal) Publisher：MDPI AG

The aim of this study was to investigate the longitudinal relationship between shorter or irregular sleep duration (SD) in early childhood and increased risk of injury at primary school age using data from a nationwide survey in Japan. We categorized SD into seven groups: 6 h, 7 h, 8 h, 9 hrs, 10 or 11 h, >12 h, and irregular, based on questionnaire responses collected at 5.5 years old. The relationship between SD and incidence of injury at 5.5–nine years of age is shown. In addition, we completed a stratified analysis on children with or without problematic behavior at eight years old. We included 32,044 children, of which 6369 were classified as having an injury and 25,675 as not having an injury. Logistic regression model showed that shorter or irregular SD categories were associated with an increased adjusted odds ratio (aOR) for injuries (6 h: aOR 1.40, 95% confidence interval (CI) 1.19–1.66, 7 h: aOR 1.10, 95% CI, 0.98–1.23, 8 h: aOR 1.13, 95% CI, 1.02–1.26, irregular: aOR 1.26, 95% CI 1.10–1.43). The same tendency was observed with shorter or irregular SD in subgroups with or without behavioral problems. Shorter or irregular sleep habits during early childhood are associated with injury during primary school age.

DOI： 10.3390/ijerph18189512

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Early childhood exposure to maternal smoking and behavioral development Reviewed International journal

Makiko Ariyoshi, Toshiharu Mitsuhashi, Naomi Matsumoto, Kazue Nakamura, Takashi Yorifuji

Archives of Environmental & Occupational Health 1 - 8 2021.8

Language：English Publishing type：Research paper (scientific journal) Publisher：Informa UK Limited

We examined the association between early childhood exposure to maternal smoking and behavioral issues at 8 years old using a large nationwide population-based longitudinal survey in Japan that began in 2001. We included 46,737 children with information about maternal smoking taken from the 6-month survey. We used logistic regression analysis to examine the hypothesis. Early childhood exposure to maternal smoking increased the risk of behavioral problems related to attention and aggressive or disruptive behavior. The adjusted odds ratios (95% confidence intervals) were 1.37 (1.22-1.54) for inability to wait their turn during play and 1.40 (1.27-1.55) for destroying toys and, compared with children of nonsmoking mothers. Children of mothers who were heavy smokers were more likely to develop behavioral problems than others. Stopping early childhood exposure to maternal exposure can protect children's neurodevelopment.

DOI： 10.1080/19338244.2021.1972278

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Excess All-Cause Mortality During the COVID-19 Outbreak in Japan Reviewed

Takashi Yorifuji, Naomi Matsumoto, Soshi Takao

Journal of Epidemiology 31 ( 1 ) 90 - 92 2021.1

Associations of Birth Weight for Gestational Age with Child Health and Neurodevelopment among Term Infants: A Nationwide Japanese Population-Based Study Reviewed International journal

Kei Tamai, Takashi Yorifuji, Akihito Takeuchi, Yu Fukushima, Makoto Nakamura, Naomi Matsumoto, Yosuke Washio, Misao Kageyama, Hirokazu Tsukahara

The Journal of Pediatrics 226 135 - 141.e4 2020.11

Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier BV

OBJECTIVE: To examine the association of specific Z-score categories of birth weight for gestational age with child health and neurodevelopment using a large nationwide survey in Japan, focusing on term infants. STUDY DESIGN: We included 36 321 children born in 2010. Hospitalization up to 66 months of age was used as an indicator of health status, and responses to questions about age-appropriate behaviors at 30 and 66 months of age were used to indicate neurobehavioral development. We conducted binomial log-linear regression analyses, controlling for child and parental variables. A restricted cubic spline function was used to model the relationship. RESULTS: Compared with children with birth weight appropriate for gestational age (-1.28 to 1.28 SDs of expected birthweight for gestational age), children who were small for gestational age (SGA) (<-1.28 SD) had higher risks of hospitalization and unfavorable neurobehavioral development, and the risks increased as SGA status became more severe. Compared with the appropriate for gestational age group, the adjusted risk ratios for hospitalization for all causes were 2.5 (95% CI, 1.7-3.6), 1.3 (95% CI, 1.1-1.6), and 1.1 (95% CI, 1.0-1.2) for children who were severely, moderately, and mildly SGA and 1.0 (95% CI, 0.9-1.1), 1.1 (95% CI, 0.9-1.2), and 1.4 (95% CI, 0.9-2.1) for children who were mildly, moderately, and severely large for gestational age, respectively. Severely large for gestational age children also had higher risks of unfavorable neurobehavioral development. These results were supported by spline analyses. CONCLUSIONS: Among term infants, the risks of unfavorable child health and neurodevelopment increased with the severity of SGA.

DOI： 10.1016/j.jpeds.2020.06.075

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Exclusively Breastfeeding Modifies the Adverse Association of Late Preterm Birth and Gastrointestinal Infection: A Nationwide Birth Cohort Study Reviewed

Kazue Nakamura, Naomi Matsumoto, Makoto Nakamura, Akihito Takeuchi, Misao Kageyama, Takashi Yorifuji

Breastfeeding Medicine 15 ( 8 ) 509 - 515 2020.8

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