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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)
To investigate the high frequency oscillations observed in the inspiratory activity of respiratory motor nerves of decerebrate cats, we applied a signal processing technique, power spectral analysis, to the electrical activity of the phrenic and recurrent laryngeal nerves. We found two peaks in the phrenic nerve power spectral densities, one at 88.1 +/- 6.4(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)
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)
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)
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)
The ability of surface electrodes to accurately detect the activity of a particular muscle relies not only on their being placed over the muscle but also on their position in relation to muscle fibre orientation. For optimal pick-up of electromyographic (EMG) signals, surface electrodes are best aligned in parallel with the fibre orientation of the(More)
Patients with medical, orthopaedic and surgical conditions are often assigned to bed-rest and/or immobilised in orthopaedic devices. Although such conditions lead to muscle atrophy, no studies have yet considered differential atrophy of the lower-limb musculature during inactivity to enable the development of rehabilitative exercise programmes. Bed-rest is(More)
BACKGROUND AND PURPOSE Muscle endurance is an important variable to measure in the assessment of back muscle function. This study investigated the electromyographic (EMG) activity and fatigue patterns of iliocostalis lumborum and multifidus muscles during a trunk holding test. SUBJECTS Sixteen male subjects (mean age = 24.2 years, SD = 4.2, range =(More)
Electromyographic (EMG) studies have shown that a large number of trunk muscles are recruited during axial rotation. The functional roles of these trunk muscles in axial rotation are multiple and have not been well investigated. In addition, there is no information on the coupling torque at different exertion levels during axial rotation. The aim of the(More)