Article

The aim of this study was to compare trunk muscular recruitment and lumbar spine
kinematics when motion was constrained to either the thorax or the pelvis. Nine
healthy women performed four upright standing planar movements (rotations,
anterior-posterior translations, medial-lateral translations, and horizontal
circles) while constraining pelvis motion and moving the thorax or moving the
pelvis while minimizing thorax motion, and four isometric trunk exercises
(conventional curl-up, reverse curl-up, cross curl-up, and reverse cross
curl-up). Surface EMG (upper and lower rectus abdominis, lateral and medial
aspects of external oblique, internal oblique, and latissimus dorsi) and 3D
lumbar displacements were recorded. Pelvis movements produced higher EMG
amplitudes of the oblique abdominals than thorax motions in most trials, and
larger lumbar displacements in the medial-lateral translations and horizontal
circles. Conversely, thorax movements produced larger rotational lumbar
displacement than pelvis motions during rotations and higher EMG amplitudes for
latissimus dorsi during rotations and anterior-posterior translations and for
lower rectus abdominis during the crossed curl-ups. Thus, different neuromuscular
compartments appear when the objective changes from pelvis to thorax motion. This
would suggest that both movement patterns should be considered when planning
spine stabilization programs, to optimize exercises for the movement and muscle
activations desired.
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Langue : ANGLAIS