Browsing by Subject "Balance"
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Item Auditory Impairment and Falls: Investigating the Link Between Hearing Loss and Falls among Elderly Individuals(2013-08-01) Villarreal, Adrian R.; Nicoleta BugnariuRecent studies show that hearing acuity correlates with postural balance, a prerequisite for mobility, and impaired hearing is associated with greater risk for falls. A possible connection between impaired hearing and falls in elderly adults could be that awareness resources may be taxed as cognitive load is increased when people with hearing impairment try to interpret what they hear. This practicum report investigated if an increased cognitive load due to auditory impairments in elderly individuals with hearing loss leads to imbalance while walking. Subjects are placed in a virtual reality world and subjects with and without hearing loss, wearing or not wearing their hearing aids will be monitored as they stand, walk, and listen under various conditions. The outcome measures analyzed were gait speed, medial-lateral and vertical displacement of an estimated center of mass, and average hearing scores. The overall goal was to gain a better understanding of the link between hearing and balance to offer new insight into prevention of falls among the elderly. Although no significant comparisons were observed between hearing impaired subjects on gait speed and center of mass displacement measures, it is important to note that not enough subjects have been observed with their hearing aids to make accurate comparisons. In addition to the experimental study, this practicum report briefly discussed the managerial tasks observed in ensuring the study follows the required guidelines involving human subjects.Item ISCHEMIA-INDUCED REDUCTION OF SOMATOSENSORY INPUT DECREASES BALANCE; ADDED VIBRATORY NOISE PARTIALLY RESTORES FUNCTION(2014-03) Rose, Gemma; Nordon-Craft, Amy; Jaffari, Roozbeh; Patterson, Rita M.; Bugnariu, NicoletaIn this project we mimicked loss of sensation in the feet, commonly seen in diabetic patients, through an ischemic protocol, a reduction of circulation in young healthy adults. This loss of sensation resulted in changes in balance like those seen in diabetic patients that are prone to falls. We then tested the effectiveness of a vibratory device to improve balance. Purpose (a): We investigated the feasibility of using vibrotactile biofeedback to improve balance in healthy young adults in which the somatosensory information from their feet has been temporarily decreased. We hypothesized that though stochastic resonance, vibratory noise applied just proximal to a region of reduced somatosensation will improve ability to maintain balance. Methods (b): Ten healthy young individuals aged 18 to 25 years old gave informed consent and participated in this study. We experimentally induced “somatosensory loss” in non-diabetic young healthy subjects using pressure cuffs wrapped around the ankles, kept inflated at 220-250mmHg for 35 min. A vibrotactile biofeedback system was positioned just above the pressure cuffs. An array of vibrotactile actuators, under a Texas Instruments MSP430 microcontroller, produced vibration at two frequencies: a barely perceptible low frequency and a high vibration frequency. Data was collected at baseline before the pressure cuffs were inflated and during the last 15 minutes of the ischemic protocol under three conditions: no vibration, low frequency and high frequency vibrations. Outcome measures included: centre of pressure (COP) variability with subjects standing with feet side by side/ one foot, with eyes open/closed; plantar surface pressure sensation and vibratory threshold evaluated with Siemens Monofilaments and Rydel-Seiffer tuning fork, respectively. Results (c): In single limb support with eyes closed, ischemia increases the COP variability (p=.01) and the addition of vibrotactile feedback at both frequencies decreases it baseline values. Plantar surface pressure sensation threshold increased after ischemia (p=.03) and was decreased with the added vibrotactile feedback. The vibratory extension threshold measured at the hallux IP joint was decreased by ischemia (p. Conclusions (d): The ischemic protocol produced balance changes in healthy young adults. The vibratory biofeedback was able to partially compensate for the experimental induced sensory loss and improve balance function. Most diabetic patients become “visually dependent” due to peripheral neuropathy, and may experience falls at night or when they turn their head or talk to someone while walking. The next step of this research is to test the effectiveness of a vibrotactile biofeedback to decrease the risk for falls in diabetic adults with peripheral neuropathies.Item Maintaining Balance in Conditions of Sensory Conflict.(2013-08-01) Appleby, Lindsay N.; Rita PattersonThe purpose of this practicum project was to investigate the effect of aging during a dual-task paradigm involving a postural and cognitive task. The aim was to examine the coordination between postural control involving upper extremity movements and cognitive decision making in conditions corresponding to functional realities. A dynamic virtual environment was used to measure postural sway and performance. Older adults had increased response times and accuracy compared to younger adults. Sway increased for both age groups, with a larger effect on the older subjects, as the cognitive task complexity increased. These results support observations that postural balance is influenced by the concurrent performance of a cognitive task and that performance of a cognitive task appears to have a more deleterious effect on postural control in older adults compared to young.