Absolute Versus Relative Physical Activity Intensity During Pregnancy And Postpartum in US Women
MEDICINE & SCIENCE IN SPORTS & EXERCISE(2023)
摘要
PURPOSE: Physical activity intensity (PAI) can be considered as absolute (determined by rate of work, i.e. Metabolic Equivalent (METs)), or relative (accounting for a person’s perceived physiological capacity). A mis-match between absolute and relative PAI may be more common in pregnancy given physiological changes, thus preventing women engaging in sufficient physical activity. We explored whether a mis-match between absolute and relative PAI was evident during pregnancy and postpartum in a prospective cohort of US women. METHODS: Women from the third Pregnancy Infection and Nutrition (PIN3)/ Postpartum Study completed physical activity questionnaires during pregnancy (n = 770; Trimester 2: T2, Trimester 3: T3) and postpartum (n = 181; 3 months: PP3, 12 months PP12). Types of physical activities women reported in the past week were assigned MET values for absolute intensity; women self-reported perceived exertion for each activity to derive relative intensity. Hierarchical regression models were used to assess whether a mis-match between absolute and relative PAI (for moderate or vigorous physical activity (MPA; VPA)) differed across pregnancy and postpartum. Analyses were adjusted for baseline physical activity, maternal age; race; educational attainment; pre-pregnancy BMI; perceived stress; and work status. RESULTS: At each time point, women were more likely to over-estimate the amount of MPA and VPA they engaged in [T2 MPA: mean 60.5 minutes/week (72.0, -49.1), VPA: 3.7 (-1.4, 8.8); T3: MPA: 47.7 (56.4, 38.9), 2.9 (-1.7, 7.4); PP3: MPA: 69.5 (95.1, 43.9), 15.8 (1.8, 29.7); PP12: MPA: 42.20 (57.6, 26.8), VPA: 2.75 (-7.8, 12.9)]. Women overestimated both MPA and VPA to a lesser extent at T3 compared to T2 (MPA: β:-12.6 [95%CI: -26.0, -0.9]; VPA: -0.9 [-6.4, 4.6]). Compared to pregnancy, women continued to overestimate their VPA throughout the postpartum period, overestimated MPA at PP3, and underestimated MPA at PP12. CONCLUSIONS: We identified a mis-match between women’s absolute and perceived physical activity intensity during both pregnancy and postpartum. Future research should focus on how perceived physical activity relates to women’s actual physiological capacity and whether this mismatch influences the amount of physical activity women engage in during the transition to motherhood.
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