Learn More
1. We have examined rapid postural adjustments associated with a class of voluntary movements that disturb postural equilibrium. In the text that follows, these motor activities are termed associated postural adjustments and voluntary focal movements, respectively. Standing human subjects performed a variety of movement tasks on a hand-held manipulandum,(More)
1. Recent studies have shown that the CNS uses proprioceptive information to coordinate multijoint movement sequences; proprioceptive input related to the kinematics of one joint rotation in a movement sequence can be used to trigger a subsequent joint rotation. In this paper we adopt a broad definition of "proprioception," which includes all somatosensory(More)
1. The individual joint rotations of a movement sequence might be controlled either by a central motor plan or by motion-dependent (i.e., kinesthetic) sensory input. Most previous research has focused on how the nervous system uses central motor plans to control movement sequences. This study examined how the nervous system uses kinesthetic input to control(More)
1. Previous studies have used tendon vibration to investigate kinesthetic illusions in the isometric limb and end point control in the moving limb. These previous studies have shown that vibration distorts the perceptions of static joint angle and movement and causes systematic errors in the end point of movement. In this paper we describe the effects of(More)
The purpose of this study was to examine whether postural instability observed in persons with spinal pain and in elderly persons is due to changes in proprioception and postural control strategy. The upright posture of 20 young and 20 elderly persons, with and without spinal pain, was challenged by vibrating ankle muscles (i.e. tibialis anterior, triceps(More)
STUDY DESIGN A two-group experimental design with repeated measures on one factor was used. OBJECTIVES To investigate the role of paraspinal muscle spindles in lumbosacral position sense in individuals with and without low back pain. SUMMARY OF BACKGROUND DATA Proprioceptive deficits have been identified in patients with low back pain. The underlying(More)
The present study addressed whether dynamic position sense at the ankle--or sense of position and velocity during movement--shows a similar decline as a result of aging as previously described for static position sense and movement detection threshold. Additionally, the involvement of muscle spindle afferents in the possible age-related decline was studied.(More)
This study investigated how the mechanical characteristics of tendon vibration influence the responses of human muscle receptors. In this study, we used a tendon vibrator in which the force, displacement and frequency of vibration were precisely controlled. The tendon vibrator could produce large amplitude displacements, so it was also used to impose(More)
Involuntary post-contraction muscle activity may occur after performing a strong long-lasting (about 30 s) isometric muscle contraction (Kohnstamm phenomenon). Here we examined how this putative excitatory state may interact with a locomotor movement. The subjects stood upright and were asked to oppose a rotational force applied to the pelvis for about 30 s(More)