The influence of the interrelationship between the sleep development and crying in early infancy, affected the future development

• Project/Area Number: 24593352
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Lifelong developmental nursing
• Research Institution: Akita University
• Principal Investigator: SHINOHARA Hitomi 秋田大学, 医学(系)研究科(研究院), 教授 (80319996)
• Co-Investigator(Kenkyū-buntansha): KODAMA Hideya 秋田大学, 大学院医学系研究科, 教授 (30195747) ; YOSHIDA Michiko 秋田大学, 大学院医学系研究科, 助教 (30463805)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2012: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: 乳児 / アクチグラフ / ワンチャンネル脳波計 / 睡眠構造 / 育児環境 / 睡眠脳波 / 泣き / 発達 / 睡眠 / 脳波

Outline of Final Research Achievements

Objective: To elucidate characteristic sleep structure of different nocturnal sleep patterns in early infancy. Designs: Infants’ nocturnal sleep was monitored simultaneously using actigraphy and one-channel electroencephalography (EEG) at the age of 3-4 months.　Each night’s sleep pattern was classified into three categories.
Results: Analysis was conducted during 95 nights in 27 infants. The STN pattern (sleeping through the night，n=36) was characterized by suppressed body movements while EEG represented a state of wakefulness.　The weak signal pattern（crying/fuss episodes <10 minutes or fed, n=27) tended to indicate rich and regular distributions of SWS across the night. The strong signal pattern (crying/fuss episodes≧10 minutes)n=32) was characterized by reduced sleep time, although the amount of SWS was not reduced to that degree. Exclusive breastfeeding may increase the proportion of SWS in non-REM sleep.

Research Products

• [Presentation] 生後4か月児の睡眠構造と泣き時間との関連 (2014)
  • Author(s): 吉田倫子、篠原ひとみ、兒玉英也、成田好美、工藤直子
  • Organizer: 第55回日本母性衛生学会学術集会
  • Place of Presentation: 幕張メッセ
  • Year and Date: 2014-09-13 – 2014-09-14
• [Presentation] Relationships between duration of crying/fussy behavior and sleep development in early infancy, from actigraphy to sleep EEG (2014)
  • Author(s): Hideya Kodama, Hitomi Shinohara
  • Organizer: Rhythms of Infant Life
  • Place of Presentation: Durhan University
  • Invited