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The aim of this work was to determine the changes in the duration of   spontaneous movements in the guinea pig fetus after the appearance of its   first movements. Every day from the 25th to the 35th gestation day, one fetus   from each of twenty pregnant animals was examined by ultrasound. Fetal   movements were observed for 5 min. The episode with the longest period of   movement was taken into consideration and was recorded as: <1 s, 1-3 s, and   >3 s. Days 25 and 26 were characterized by episodes lasting <1 s; days 29 to   31 were dominated by episodes lasting 1-3 s, and days 34 and 35 by episodes   lasting >3 s (χ2 = 140.51 p <0.05). Tracking the dynamics of progressive   increases in the longest episode of spontaneous movement could be a useful   factor in estimating the maturity and condition of a fetus. [Projekat   Ministarstva nauke Republike Srbije, br. 175006/2011

Monitoring the progressive increase of the longest episode of spontaneous movements in Guinea pig fetus