Question
How does the modern theory of core stability differ from earlier beliefs?
Answer
The modern understanding of core stability emphasizes that stability is achieved through mobility and dynamic function, rather than by static muscle contractions or holding positions. Earlier models suggested that stability required muscles to contract and hold the spine in a neutral alignment. Current evidence indicates that the body supports itself through a mobile system that relies on coordinated intra-abdominal pressure, allowing muscles to work together dynamically during movement. This system adjusts based on the activity being performed, whether it involves concentric contractions, eccentric elongations, or a combination of both.
Alignment, once thought to be crucial for stability, is now viewed as less rigidly important. Instead, the human body is designed to adapt to positional changes, with the "best position" being the "next position." This means that encouraging people to move frequently and shift positions—whether during physical activity or routine tasks—helps optimize muscle function and supports the body dynamically. Alignment precision becomes critical only under high-load conditions, such as during maximal weightlifting efforts.
This evolving theory also integrates foundational exercises, such as isolated muscle activations for the transverse abdominis or pelvic floor. These exercises remain valuable for reestablishing proprioceptive awareness and building the brain-muscle connection, which is essential for effective motor control and anticipatory strategies.
This Ask the Expert is an edited excerpt from the course, Optimizing Core Retraining, Part 1, by Jennifer Stone, PT, DPT, OCS, PHC, TPS, HLC.
