Physical activity changes and influencing factors among Chinese pregnant women: a longitudinal study

Objective: Participating in physical activity during pregnancy has benefited a lot from maternal and child health. However, there are few longitudinal studies describing activity patterns and related factors during pregnancy. The aim of this study is to investigate longitudinal physical activity changes and the influencing factors of Chinese pregnant women.Methods: From January to August 2020, 240 pregnant women were recruited in Hangzhou, China. Physical activity during pregnancy was assessed in the first, second, and third trimesters of pregnancy by using the Pregnancy Physical Activity Questionnaire.Results: The daily energy consumption during first, second, and third trimesters was 20.55, 20.76, 17.19 METs-h/d. The results of repeated-measure analysis of variance and pairwise comparison showed that the total daily energy consumption of physical activity in the third trimester was significantly lower than that in the first and second trimesters, with statistical significance (p < 0.001). The generalized estimation equation showed that education level, pre-pregnancy BMI, gravidity, unnaturally conceived and pre-pregnancy exercise habits were the influencing factors of physical activity during pregnancy (p < 0.05).Conclusion: Physical activity levels of pregnant women during different trimester were not optimistic. In order to improve physical activity during pregnancy and promote the health status of both mother and the developing baby, more attention should be paid on pregnant women with low education level, high BMI before pregnancy, primipara, unnaturally conceived and no good exercise habits before pregnancy.