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STUDY DESIGN The contribution of transversus abdominis to spinal stabilization was evaluated indirectly in people with and without low back pain using an experimental model identifying the coordination of trunk muscles in response to a disturbances to the spine produced by arm movement. OBJECTIVES To evaluate the temporal sequence of trunk muscle activity(More)
OBJECTIVE To compare trunk muscle coordination in people with and without low back pain with varying speeds of limb movement. STUDY DESIGN Abdominal and back extensor muscle activity in association with upper limb movement was compared among three speeds of movement and between people with and without low back pain. PARTICIPANTS Fourteen subjects with a(More)
STUDY DESIGN A clinical study was conducted on 39 patients with acute, first-episode, unilateral low back pain and unilateral, segmental inhibition of the multifidus muscle. Patients were allocated randomly to a control or treatment group. OBJECTIVES To document the natural course of lumber multifidus recovery and to evaluate the effectiveness of(More)
A clinical test of the function of the deep abdominal muscles was compared to a laboratory electromyographic (EMG) investigation of the contribution of transversus abdominis (TrA) to stability of the lumbar spine during limb movement. The two different functions of TrA were evaluated in 15 subjects. The subject group included six subjects with chronic low(More)
BACKGROUND AND PURPOSE Activity of the trunk muscles is essential for maintaining stability of the lumbar spine because of the unstable structure of that portion of the spine. A model involving evaluation of the response of the lumbar multifidus and abdominal muscles to leg movement was developed to evaluate this function. SUBJECTS To examine this(More)
Because the structure of the spine is inherently unstable, muscle activation is essential for the maintenance of trunk posture and intervertebral control when the limbs are moved. To investigate how the central nervous system deals with this situation the temporal components of the response of the muscles of the trunk were evaluated during rapid limb(More)
A very specific type of exercise has been devised which is proving to provide effective pain relief for chronic and recurrent back pain sufferers. The exercise approach focuses on retraining a precise co-contraction pattern of the deep trunk muscles, the transversus abdominis and lumbar multifidus. The approach is based on the knowledge of how muscles(More)
Rapid shoulder movement is preceded by contraction of the abdominal muscles to prepare the body for the expected disturbance to postural equilibrium and spinal stability provoked by the reactive forces resulting from the movement. The magnitude of the reactive forces is proportional to the inertia of the limb. The aim of the study was to investigate if(More)
By manipulation of movement reaction time we investigated the co-ordination between the motor command for arm movement and the associated 'anticipatory' postural response of the abdominal muscles. Limb movement reaction time was varied by changing the expectation of limb movement direction required in a choice-reaction-time task. Timing of the(More)
Active protection of the lumbar spine is important in prevention of back strain during exercise. This EMG study investigated three common techniques used for lumbar stabilisation : posterior pelvic tilt, lower abdominal hollowing with lumbar spine flattening and abdominal bracing. The aim was to determine which method encouraged the best stability pattern.(More)