Background: The problem of an inadequate level of physical activity (PA) is important in the context of its relationship with the quality of life (QoL) of pregnant women. The aim of this study was to analyze the relationships between PA and QoL among pregnant women. Methods: The study analyzed 346 questionnaires filled in by pregnant women (157 in the second trimester and 189 in the third). The tool used for assessment of PA was the Pregnancy Physical Activity Questionnaire-Polish version (PPAQ-PL). The quality of life (QoL) was assessed by the World Health Organization Quality of Life Questionnaire-short form (WHOQoL-Bref). The results obtained from the PPAQ-PL and WHOQoL-Bref questionnaires for women in the second and third trimesters of pregnancy and intergroup differences were analyzed. Results: There was a significant correlation in the group of women in the second trimester of pregnancy between quality of life in the
physical health domain and the intensity and type of physical activity. The women who rated their quality of life higher in this domain declared higher energy expenditures (EE) associated with
vigorous activity (
R = 0.159,
p ≤ 0.05), as well as with
occupational activity (
R = 0.166;
p ≤ 0.05) and
sport/
exercise activity (
R = 0.187;
p ≤ 0.05). In women in the third trimester, higher EE related to
sport/
exercise activity coincided with higher assessments of the
overall quality of life (
R = 0.149,
p ≤ 0.05) and
general health (
R = 0.170,
p ≤ 0.05). In the case of the
psychological domain (
R = 0.161,
p ≤ 0.05) and
social relationship domain (
R = 0.188;
p ≤ 0.05) of QoL, positive correlations occurred with EE related to
vigorous activity. In contrast, high assessment of
physical health domain coincided with higher EE related to
occupational activity (
R = 0.174;
p ≤ 0.05). Conclusions: Our study makes an important contribution to knowledge concerning the correlations between PA and QoL in pregnancy. The results suggest the need for improvement in prenatal care and promotion of PA programs for pregnant women.
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