On the one hand, research looking at the effects of a single event of maximum intensity exercise were examined. On the other, the impact of exercise during a certain period of the pregnancy was observed.
Annars vegar var notast við rannsóknir sem skoðuðu áhrif hámarksáreynslu í eitt skipti og hins vegar áhrif hreyfingar yfir ákveðið tímabil á meðgöngu.