RESUMEN
BACKGROUND@#Pregnancy-related low back pain is a common complaint with numerous adverse consequences. Unfortunately, the effect of healthrelated quality of life and physical activity status on pregnancy-related low back pain remains understudied.@*OBJECTIVES@#This study aimed to examine the influence of physical activity and health-related quality of life on pregnancy-related low back pain among pregnant women.@*METHODS@#A survey of 398 pregnant women was conducted using the Modified Pregnancy Low Back Pain, Medical Outcome Survey Short Form (MOS-SF), and Pregnancy Physical Activity Questionnaire (PPAQ) to assess pregnancy-related low back pain, quality of life, and physical activity status among the participants.@*RESULTS@#About fifty-four percent (54%) of the pregnant women reported experiencing low back pain during pregnancy. There were no significant differences between most physical activity intensities and domains for pregnant women with and without pregnancy-related low back pain, with the exception of women identified as sedentary (12.9±14.8 versus 17.4±16.2) or inactive (18.7±20.0 versus 23.6±19.8). Furthermore, waist circumference (OR: 0.97; 95% CI: 0.96 to 0.99) and Physical component scores (PCS) (OR: 0.96; 95% CI: 0.93 to 0.98) were associated with pregnancy-related low back pain. An interaction of height and occupation also showed an association with pregnancy related low back pain (OR: 1.04; 95% CI: 1.01 to 1.08).@*CONCLUSION@#Sedentary and inactivity are the only physical activity intensity and domain associated with pregnancy-related low back pain, which affect the physical well-being of the expecting mothers.