Intra-session real-time ultrasonography feedback improves the quality contraction of transverse abdominis

The Hollowing exercise is part of training regimens to recover dynamic lumbar stability thought the enhancement of deep abdominal muscles function. During exercise execution guidance is usually given, but the intra-session effectiveness is unknown. We compared the thickness of transverse abdominis (Tra) during Hollowing exercise guided by feedback using ultrasonography images (US) together verbal guidance and verbal guidance alone. Our main findings are related to improved Tra contraction when feedback was delivered during the session using US.