title: Leisure-time physical activity during pregnancy and offspring size at 18 to 24 months.
abstract: BACKGROUND
  Leisure-time physical activity (LTPA) during pregnancy has maternal benefits, but effects on offspring have not often been considered. This study aimed to determine associations among trimester-specific LTPA during pregnancy and toddler size.
  
  
  METHODS
  Women (n = 300) were recruited while pregnant in 2006. At follow-up (2008), women reported demographics; recalled type, duration, and frequency of trimester-specific LTPA (MET·min/wk); and rated their toddler's current LTPA level (more, same, or less than others their age). A subset (n = 23) volunteered to have maternal and toddler height, weight, and body fat measured. Maternal body mass index (BMI) and toddler weight-for-height z-scores (WHZ) were calculated.
  
  
  RESULTS
  Median toddler WHZ was 0.6 (range -0.5 to 2.9). In Spearman correlations, third trimester LTPA was marginally associated with lower toddler weight (rs = -0.39, P = .06) and WHZ (rs = -0.40, P = .06), but no other measures of maternal LTPA and toddler body size were related. Birth weight z-score was positively associated with toddler weight (rs = 0.51, P = .01) but negatively associated with percent body fat (rs= -0.46, P = .03). Measures of maternal size were unassociated with toddler size.
  
  
  CONCLUSIONS
  These results provide preliminary support for LTPA during late pregnancy to have a lasting effect on offspring size.
authors: Dept of Kinesiology, Michigan State University, East Lansing, MI, USA.
authors: Kelly
authors: K
authors: Mattran
authors: Lanay M
authors: LM
authors: Mudd
authors: Rebecca A
authors: RA
authors: Rudey
authors: Jeannette S C
authors: JS
authors: Kelly
mesh_terms: D000328:Adult; D001724:Birth Weight; D015992:Body Mass Index; D002648:Child; D002657:Child Development / Q000502:physiology*; D015444:Exercise; D005260:Female; D006801:Humans; D007223:Infant; D007899:Leisure Activities; D008297:Male; D011247:Pregnancy / Q000502:physiology*; D012959:Socioeconomic Factors