Research Topics
| R C FitzpatrickSummaryAffiliation: University of New South Wales Country: Australia Publications
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Detail Information
Publications
What does galvanic vestibular stimulation stimulate?Daniel L Wardman
Prince of Wales Medical Research Institute, NSW, Sydney, Australia
Adv Exp Med Biol 508:119-28. 2002..The model appears consistent with published data on the ocular and postural responses to GVS, and suggests other testable hypotheses concerning postural, ocular and perceptual responses to GVS...
Paradoxical muscle contractions and the neural control of movement and balanceRichard C Fitzpatrick
Prince of Wales Medical Research Institute, Sydney, New South Wales, Australia
J Physiol 564:2. 2005- Choice stepping response and transfer times: effects of age, fall risk, and secondary tasksRebecca J St George
Prince of Wales Medical Research Institute, University of New South Wales, Sydney, Australia
J Gerontol A Biol Sci Med Sci 62:537-42. 2007..Here we investigate how a competing cognitive task and an obstacle to stepping affect the initiation and execution phases of choice stepping reaction times in young and older people... - Effects of galvanic vestibular stimulation during human walkingR C Fitzpatrick
Prince of Wales Medical Research Institute, Sydney, Australia
J Physiol 517:931-9. 1999..However, altered perception of the vertical or the base of support, or direct vestibulo-fugal influences on the leg muscles could contribute to the changes in gait... - Probing the human vestibular system with galvanic stimulationRichard C Fitzpatrick
Prince of Wales Medical Research Institute, Easy St, Randwick, Sydney, NSW 2031, Australia
J Appl Physiol 96:2301-16. 2004..Thus we propose the hypothesis that the otolithic component of the balance response originates from only the pars medialis of the utricular macula... - Resolving head rotation for human bipedalismRichard C Fitzpatrick
Prince of Wales Medical Research Institute and University of New South Wales, Sydney 2031, Australia
Curr Biol 16:1509-14. 2006.... - More pulsating movementRichard C Fitzpatrick
Prince of Wales Medical Research Institute, Sydney, Australia 2031
J Physiol 551:4. 2003 - Otolith and canal reflexes in human standingIan Cathers
Prince of Wales Medical Research Institute and University of New South Wales, Sydney, Australia
J Physiol 563:229-34. 2005..We propose that the short-latency reflex and small transient sway are driven by the otolith organs and the medium-latency response and the large sway are driven by the semicircular canals... - Acceleration patterns of the head and pelvis when walking are associated with risk of falling in community-dwelling older peopleHylton B Menz
Prince of Wales Medical Research Institute, University of New South Wales, High Street, Randwick, NSW 2031, Australia
J Gerontol A Biol Sci Med Sci 58:M446-52. 2003.... - Acceleration patterns of the head and pelvis when walking on level and irregular surfacesHylton B Menz
Prince of Wales Medical Research Institute, University of New South Wales, High St, Randwick, Sydney NSW 2031, Australia
Gait Posture 18:35-46. 2003.... - Age-related differences in walking stabilityHylton B Menz
Prince of Wales Medical Research Institute, High Street, Randwick, New South Wales 2031, Australia
Age Ageing 32:137-42. 2003..a large proportion of falls in older people occur when walking; however the mechanisms underlying impaired balance during gait are poorly understood... - Choice stepping reaction time: a composite measure of falls risk in older peopleS R Lord
Prince of Wales Medical Research Institute, Sydney, Australia
J Gerontol A Biol Sci Med Sci 56:M627-32. 2001..This study investigated the neuropsychological, sensorimotor, speed, and balance contributions to a new test of choice stepping reaction time (CSRT) and determined whether this new test is an important predictor of falls in older people... - Passive tactile sensory input improves stability during standingM W Rogers
Prince of Wales Medical Research Institute, Sydney, NSW, Australia
Exp Brain Res 136:514-22. 2001..We concluded that, if passive sensory input about posture is available, the postural control process adapts to this input, modulating postural stabilizing reactions... - Position and velocity responses to galvanic vestibular stimulation in human subjects during standingDaniel L Wardman
Prince of Wales Medical Research Institute and University of New South Wales, Sydney, Australia
J Physiol 547:293-9. 2003..ANOVA and pairwise comparisons confirmed this. It is concluded that postural responses to GVS arise through stimulation of both otolith and canal afferents... - Effects of spatial and nonspatial memory tasks on choice stepping reaction time in older peopleDaina L Sturnieks
Prince of Wales Medical Research Institute, University of New South Wales, Sydney, Australia
J Gerontol A Biol Sci Med Sci 63:1063-8. 2008..In this study, we compared the effects of carefully matched visuospatial (VS) and nonspatial (NS) secondary tasks on choice stepping reaction time (CSRT)... - Effects of muscle perfusion pressure on fatigue and systemic arterial pressure in human subjectsJ R Wright
Prince of Wales Medical Research Institute, Sydney, New South Wales 2031, Australia
J Appl Physiol 86:845-51. 1999..We conclude that human muscle fatigue can be increased by physiological reductions in perfusion pressure. Central blood pressure increases as the muscle fatigues, a response that may partially offset declining muscle performance... 
Impaired depth perception and restricted pitch head movement increase obstacle contacts when dual-tasking in older peopleJasmine C Menant
DSC, Falls and Balance Research Laboratory, Prince of Wales Medical Research Institute, University of New South Wales, Barker Street, Randwick, New South Wales 2031, Australia
J Gerontol A Biol Sci Med Sci 65:751-7. 2010..The aims of the study were to determine (i) the effect of a secondary visual task on obstacle contacts when older people negotiated an obstacle course and (ii) physiological factors associated with obstacle contacts...- Muscle weakness impairs the proprioceptive control of human standingAnnie A Butler
Prince of Wales Medical Research Institute and University of New South Wales, Sydney, Australia
Brain Res 1242:244-51. 2008..This indicates a functional link between contractile and sensory muscular processes and shows that multiple sensory inputs are more important for people with muscle weakness... - Postural control at the human wristJohn Z Z Chew
Prince of Wales Medical Research Institute and University of New South Wales, Sydney, NSW 2031 Australia
J Physiol 586:1265-75. 2008..We propose that postural control and movement control are fundamentally different neural processes... - Detection of simultaneous movement at two human arm jointsDaina L Sturnieks
Prince of Wales Medical Research Institute, Easy Street, and University of New South Wales, Randwick, Sydney, NSW 2031, Australia
J Physiol 585:833-42. 2007..We conclude that the brain uses potentially ambiguous signals from biarticular muscles for kinaesthesia and that this limits acuity for detecting joint movement when adjacent joints are moved simultaneously... - Walking stability and sensorimotor function in older people with diabetic peripheral neuropathyHylton B Menz
Prince of Wales Medical Research Institute, University of New South Wales, Randwick, New South Wales, Australia
Arch Phys Med Rehabil 85:245-52. 2004..These results provide further insights into the role of peripheral sensory input in the control of gait stability, and suggest possible mechanisms underlying the increased risk of falling in older people with diabetic neuropathy... - Galvanic vestibular stimulation evokes sensations of body rotationRichard C Fitzpatrick
Prince of Wales Medical Research Institute and University of New South Wales, Sydney, Australia
Neuroreport 13:2379-83. 2002..When the GVS and movement were congruent, subjects reported greater spin. We conclude that GVS produces a vestibular signal of rotation, probably though an effect on semicircular canals... - Thumb and finger forces produced by motor units in the long flexor of the human thumbW S Yu
Prince of Wales Medical Research Institute, Easy Street, Randwick, New South Wales 2031, Australia
J Physiol 583:1145-54. 2007.... - The fusimotor and reafferent origin of the sense of force and weightBilly L Luu
Neuroscience Research Australia and University of New South Wales, Sydney, NSW 2031 Australia
J Physiol 589:3135-47. 2011..These results therefore challenge the distinction between central- and peripheral-based perception, and the concept that muscle spindles provide only information about limb position and movement... - Effects of galvanic vestibular stimulation on human posture and perception while standingDaniel L Wardman
Prince of Wales Medical Research Institute and University of New South Wales, Sydney, Australia
J Physiol 551:1033-42. 2003..Instead, they and other observations support a simpler interpretation that the GVS signal is consistent with head movement and evokes an automated response to stabilise the head in space... - A tactile stimulus applied to the leg improves postural stability in young, old and neuropathic subjectsHylton B Menz
Musculoskeletal Research Centre, School of Physiotherapy, La Trobe University, Bundoora, VIC 3086, Australia
Neurosci Lett 406:23-6. 2006..This applies to older subjects and subjects with peripheral neuropathy as well as healthy young subjects. These results have implications for novel approaches for improving stability in people with peripheral sensory loss... - The cortex, interneurones and motoneurones in the control of movementRichard C Fitzpatrick
J Physiol 586:1215-6. 2008 - Virtual head rotation reveals a process of route reconstruction from human vestibular signalsBrian L Day
MRC Human Movement Group, Sobell Department of Motor Neuroscience, Institute of Neurology, University College London, UK
J Physiol 567:591-7. 2005..This computation yields the signal of body rotation in the horizontal plane that feeds our perception of the route travelled... - A structural equation model relating impaired sensorimotor function, fear of falling and gait patterns in older peopleHylton B Menz
Musculoskeletal Research Centre, School of Physiotherapy, La Trobe University, Bundoora, VIC 3086, Australia
Gait Posture 25:243-9. 2007..Particularly important is the indication that fear-related step length shortening may be maladaptive... - The vestibular systemBrian L Day
MRC Human Movement Group, Sobell Department of Motor Neuroscience and Movement Disorders, Institute of Neurology, University College London, Queen Square, London WC1N 3BG, UK
Curr Biol 15:R583-6. 2005