Reliability of transversus abdominis thickness and inter-recti distance during forced expiration with limb adduction in primiparous women following vaginal delivery.

Introduction: The postpartum period involves significant biomechanical changes that impact maternal health, particularly in the activation of the transversus abdominis (TrA) and the inter-recti distance (IRD), which may contribute to lumbo-pelvic pathologies. While lumbopelvic exercises are beneficial, it remains unclear whether upper or lower limb adduction combined with forced expiration is more effective in activating the TrA. Therefore, the primary objective of this study is to analyze changes in TrA thickness and IRD during four conditions.