Seasonal variations of neuromotor development by 14 months of age: Hamamatsu Birth Cohort for mothers and children (HBC Study)

The present study aimed at investigating whether neuromotor development, from birth to 14 months of age, shows seasonal, cyclic patterns in association with months of birth. Study participants were 742 infants enrolled in the Hamamatsu Birth Cohort (HBC) Study and followed-up from birth to the 14th...

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Bibliographic Details
Published in:PloS one 2012-12, Vol.7 (12), p.e52057-e52057
Main Authors: Tsuchiya, Kenji J, Tsutsumi, Hiroshi, Matsumoto, Kaori, Takei, Nori, Narumiya, Makiko, Honda, Maiko, Thanseem, Ismail, Anitha, Ayyappan, Suzuki, Katsuaki, Matsuzaki, Hideo, Iwata, Yasuhide, Nakamura, Kazuhiko, Mori, Norio
Format: Article
Language:English
Subjects:
Age
Analysis
Autism
Biology
Birth rate
Breastfeeding & lactation
Child development
Child Development - physiology
Childbirth & labor
Children
Children & youth
Cohort analysis
Earth Sciences
Exercise
Female
Humans
Infant
Infant, Newborn
Infants
Japan
Male
Medicine
Mother-Child Relations
Motor skill
Motor Skills
Physicians
Psychiatry
Psychomotor Performance
Seasonal variations
Seasons
Social and Behavioral Sciences
Studies
Summer
Time Factors
Trigonometric functions
Vitamin D
Vitamin deficiency
Winter
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Summary:The present study aimed at investigating whether neuromotor development, from birth to 14 months of age, shows seasonal, cyclic patterns in association with months of birth. Study participants were 742 infants enrolled in the Hamamatsu Birth Cohort (HBC) Study and followed-up from birth to the 14th month of age. Gross motor skills were assessed at the ages of 6, 10, and 14 months, using Mullen Scales of Early Learning. The score at each assessment was regressed onto a trigonometric function of months of birth, with an adjustment for potential confounders. Gross motor scores at the 6th and 10th months showed significant 1-year-cycle variations, peaking among March- and April-born infants, and among February-born infants, respectively. Changes in gross motor scores between the 10th and 14th months also showed a cyclic variation, peaking among July- and August-born infants. Due to this complementary effect, gross motor scores at the 14th month did not show seasonality. Neuromotor development showed cyclic seasonality during the first year of life. The effects brought about by month of birth disappeared around 1 year of age, and warmer months seemed to accelerate the neuromotor development.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0052057