purpose ankle sprain is one of the most common injuries among athletes and instability and injury to this joint is responsible for long time loss of physical and recreational activity. also, it can impose high costs to sport teams. prevention of this injury is an important concern of practice and rehabilitation. one way of reducing the possibility of ankle joint injury is using an ankle orthosi...

Few studies have been carried out to examine the relation between postural stability and subjective reports or feelings of motion sickness. Two views seem to exist on the relation between immersion in a virtual reality (VR) environment and subjective feelings of motion sickness. One predicts that the immersion induces both postural instability and motion sickness. Another view is that preimmers...

INTRODUCTION The pathophysiology underlying postural instability in Parkinson's disease is poorly understood. The frequent co-existence with freezing of gait raises the possibility of shared pathophysiology. There is evidence that dysfunction of brainstem structures contribute to freezing of gait. Here, we evaluated whether dysfunction of these structures contributes to postural instability as ...

OBJECTIVE Galvanic vestibular stimulation (GVS) activates the vestibular afferents, and these changes in vestibular input exert a strong influence on the subject's posture or standing balance. In patients with Parkinson's disease (PD), vestibular dysfunction might contribute to postural instability and gait disorders. METHODS Current intensity was increased to 0.7 mA, and the current was appl...

background: vitamin d is an important factor responsible for many physiologic functions. vitamin d deficiency is associated with increased risk of neurodegenerative disease. the level of vitamin d in iranian patients with parkinson's disease and its relationship with severity of symptoms and signs were evaluated in this study. methods: eighty-three patients with parkinson's disease (pd) were re...

Falls among the older population can severely restrict their functional mobility and even cause death. Therefore, it is crucial to understand the mechanisms and conditions that cause falls, for which it is important to develop a predictive model of falls. One critical quantity for postural instability detection and prediction is the instantaneous stability of quiet upright stance based on motio...

INTRODUCTION Progressive supranuclear palsy (PSP) is characterized by early postural instability and backward falls. The mechanisms underlying backward postural instability in PSP are not understood. The aim of this study was to test the hypothesis that postural instability in PSP is a result of dysfunction in the perception of postural verticality. METHODS We gathered posturography data on 1...

introduction: parkinson`s disease (pd) is a chronic disorder of basal ganglia with cardinal signs of resting tremor, bradykinesia, rigidity and postural instability. various studies have evaluated quiet stance postural stability in mild pd but as the authors know there is no consensus on this issue. therefore, the aim of this study was to evaluate stance stability of the subjects at early stage...