Michelle Gwerder, Yong K Kim, Paciane B Studer, Angela Frautschi, William R Taylor, Navrag B Singh
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引用次数: 0
Abstract
Background: Walking is essential for maintaining autonomy and quality of life, yet age-related declines in sensory and motor function can impair gait control and increase fall risk. Auditory white noise stimulation may offer a simple approach to support sensorimotor function and enhance gait strategy. This effect may be particularly relevant in older adults, because their sensory signals are often diminished. This intervention study tested three hypotheses: 1) subthreshold auditory white noise stimulation enhances gait strategy more in older than in younger adults, 2), subthreshold auditory white noise stimulation has a greater impact on gait strategy than threshold and supra-threshold noise, and 3) the effects of auditory white noise persist beyond the period of stimulation.
Methods: Fifty young (mean age 23.8 ± 2.3 years) and 50 older adults (68.1 ± 5.1 year) walked on a treadmill under baseline, three randomized white noise conditions (subthreshold, threshold, and supra-threshold), and a post-condition (NormPost, approximately 15 min after stimulation). Linear mixed-effects models assessed spatiotemporal gait parameters, margin of stability, and gait variability.
Results: Older adults exhibited significantly shorter stride length (ES = 0.28) and greater variability across all gait parameters than younger adults (ES = 0.06-0.22). Auditory white noise significantly affected mean gait parameters, with age-dependent responses observed for most parameters. During subthreshold stimulation, older adults showed significantly reduced cadence (ES = 0.33) and step width (ES = 0.62), and increased stride time (ES = 0.5), support phases (ES = 0.39-0.64), stride length (ES = 0.49), and increased antero-posterior margin of stability (ES = 0.58) compared to baseline. No significant differences were found between the three auditory noise intensities. Several gait parameter changes remained evident in the NormPost condition with some showing greater changes from baseline than during stimulation.
Conclusion: Auditory white noise stimulation was associated with changes in several gait parameters in older adults that were not observed in younger adults, suggesting age-dependent responses to auditory noise. The persistence of some effects beyond stimulation warrants further investigation into potential underlying sensorimotor and attentional mechanisms. While auditory white noise represents a non-invasive and easily implementable form of sensory stimulation, further studies are needed to establish its effects on gait strategy and fall risk, particularly during overground walking and in clinical populations.
期刊介绍：
The translation of new discoveries in medicine to clinical routine has never been easy. During the second half of the last century, thanks to the progress in chemistry, biochemistry and pharmacology, we have seen the development and the application of a large number of drugs and devices aimed at the treatment of symptoms, blocking unwanted pathways and, in the case of infectious diseases, fighting the micro-organisms responsible. However, we are facing, today, a dramatic change in the therapeutic approach to pathologies and diseases. Indeed, the challenge of the present and the next decade is to fully restore the physiological status of the diseased organism and to completely regenerate tissue and organs when they are so seriously affected that treatments cannot be limited to the repression of symptoms or to the repair of damage. This is being made possible thanks to the major developments made in basic cell and molecular biology, including stem cell science, growth factor delivery, gene isolation and transfection, the advances in bioengineering and nanotechnology, including development of new biomaterials, biofabrication technologies and use of bioreactors, and the big improvements in diagnostic tools and imaging of cells, tissues and organs.
In today`s world, an enhancement of communication between multidisciplinary experts, together with the promotion of joint projects and close collaborations among scientists, engineers, industry people, regulatory agencies and physicians are absolute requirements for the success of any attempt to develop and clinically apply a new biological therapy or an innovative device involving the collective use of biomaterials, cells and/or bioactive molecules. “Frontiers in Bioengineering and Biotechnology” aspires to be a forum for all people involved in the process by bridging the gap too often existing between a discovery in the basic sciences and its clinical application.
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