Background: Physical activity during pregnancy has many health benefits. However, women report perceived barriers and overall the physical activity level is insufficient [1, 2]. Research has shown that advice and information provided by health professionals can influence the PA behaviors of pregnant women. This study asessed the impact of a counseling intervention offered in addition to routine preg-nancy care on physical activity patterns. The secondary objective was to evaluate the impact on per-ceived barriers and perinatal health outcomes. Methods: A randomized controlled trial was conducted in the Maternity Unit of the Guadeloupe Hos-pital. Ninety-­six pregnant women were randomized to a control or intervention group (Figure 1). Fig. 1 Flowchart of participant progress. Data collected throughout pregnancy. Regular physical activity coun-seling was dispensed to the women in the intervention group, in addition to the routine prenatal visits, by trained healthcare providers. The physical activity level and the perceived barriers were assessed in each trimester. Outcomes for the perinatal health of the mother and child was measured throughout pregnancy and at delivery. Results: A significant between-­group difference was observed for some of the perceived barriers, in favor of the intervention group, for example, the feeling of insecurity when practicing PA was lower in the intervention group (i.e., p=0.027, p=0.007, p=0.008, respectively) in the three trimesters, as was weight related to pregnancy in the second trimester (p=0.030). There were no significant between-­group differences for the major indices of physical activity, whether measured or reported, or for the outcomes for the perinatal health of the mother and child. Conclusions: The intervention and control groups showed differences in their responses to questions about the perceived intra-­ and interpersonal barriers, which can be interpreted as an improvement in response to the intervention. These results agree with the literature [3]. The intervention, which was provided as part of routine care, was unable to limit the decline in physical activity. In our study, a de-cline was evidenced in the control group even for that intensity category, but it was preserved in the intervention group. Sedentary activities are very low-­intensity activities, with no demonstrated impact on health. This intervention not improving maternal/neonatal outcomes and confirm the challenge re-ported by others [4]. Future research should focus on the design of interventions that have a sufficient quantitative impact on perceived barriers in order to limit physical activity decline. 1. Currie S, Sinclair M, Liddle DS, Nevill A, Murphy MH. Application of objective physical activity measurement in an antenatal physical activity consultation intervention: a randomised controlled trial. BMC Public Health. 2015;;15:1259. 2. Coll CVN, Domingues MR, Gonçalves H, Bertoldi AD. Perceived barriers to leisure-­time physical activity during pregnancy: A literature review of quantitative and qualitative evidence. J Sci Med Sport. 2017;;20:17–25. 3. Haakstad LAH, Vistad I, Sagedal LR, Lohne-­Seiler H, Torstveit MK. How does a lifestyle intervention during pregnancy influence perceived barriers to leisure-­time physical activity? The Norwegian fit for delivery study, a randomized controlled trial. BMC Pregnancy Childbirth. 2018;18:127. 4. Kunath J, Günther J, Rauh K, Hoffmann J, Stecher L, Rosenfeld E, et al. Effects of a lifestyle intervention during pregnancy to prevent excessive gestational weight gain in routine care – the cluster-­randomised GeliS trial. BMC Med. 2019;;17. doi:10.1186/s12916-­018-­1235-­z.