Core exercises that involve multiple muscle groups and movements activate the side abdominal muscles 25% to 300% more than exercises that target only one muscle group, such as side bends or side...
Mechanism
Synthesis from 1 study
Moving your arms and legs while holding your core still makes your body work harder to stay balanced. To keep from wobbling, the muscles on the sides of your abdomen turn on much harder than they do when you just twist your torso alone.
Most probable mechanism
When you move your arms and legs while keeping your core steady, your body has to work harder to stay balanced. This forces the muscles on the sides of your abdomen to turn on more strongly to keep your spine and pelvis from wobbling.
Simultaneous activation of distal muscles (e.g., deltoid and gluteus maximus) during integrated movements shifts the body's center of mass and creates dynamic instability.
Proprioceptive and vestibular systems detect the resulting postural disturbance and increase afferent signaling to the central nervous system.
The central nervous system responds by increasing motor unit recruitment and firing rates in proximal trunk muscles, including the external oblique, to stabilize the spine and pelvis against destabilizing forces.
Enhanced neuromuscular coordination across multiple joints leads to sustained, elevated activation of the external oblique without reduction in activation of other core muscles.
Evidence from Studies
Supporting (1)
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Integration Core Exercises Elicit Greater Muscle Activation Than Isolation Exercises
Contradicting (0)
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