Effects of dual-tasking on time-to-boundary during stance in people with PD: A preliminary study

Peterson, Daniel S.; Phan, Vu; Richmond, Sutton B.; Lee, H.

doi:10.1016/j.clinbiomech.2021.105420

Cited by 11 publications

(1 citation statement)

References 40 publications

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“…Clinicians utilize the unilateral standing test as one of the most valuable balance tests because it is widely considered to be cost-effective and feasible in clinical research settings [ 10 , 11 ]. Previous studies reported postural stability during unilateral standing to assess time-to-boundary (TTB) of postural control [ 12 – 14 ]. Their approaches quantify postural stability in unilateral stance for the assessment of TTB of postural control.…”

Section: Introductionmentioning

confidence: 99%

Normalized stability time analysis within the boundaries between adults with and without fear of falling

Lee,

Sung

2024

Aging Clin Exp Res

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Background The unilateral stance test, measured by the center of pressure (COP), has been widely used to identify balance deficits. However, there is a critical gap in understanding the specific COP thresholds on postural stability in adults with a fear of falling (FOF). Aims To investigate the normalized stability time, which was defined as the ratio of time spent within stability boundaries to the total test duration, under different visual conditions and specific thresholds between adults with and without FOF. Methods Twenty-one older adults with FOF and 22 control subjects completed the unilateral limb standing test in eyes-open and eyes-closed conditions. Normalized stability times were computed based on five pre-determined COP sway range thresholds: 10 mm, 15 mm, 20 mm, 25 mm, and 30 mm. Results Receiver operating characteristic analysis determined the diagnostic accuracy of FOF. There were significant differences in the effects of both visual conditions (F = 46.88, p = 0.001) and threshold settings (F = 119.38, p = 0.001) on stability time between groups. The FOF group significantly reduced normalized stability time at the 10 mm COP threshold under eyes-closed conditions (t = – 1.95, p = 0.03). Discussion The findings highlight the heightened sensitivity of the 10 mm COP threshold in identifying group variances in postural stability when eyes are closed. Moreover, the FOF group displayed a marked reduction in stability duration based on visual scenarios and normalized thresholds. Conclusion The study highlights the need to account for both COP boundaries and visual conditions in adults with FOF. When assessing postural control during unilateral stances, clinicians must also give attention to non-visual cues.

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Section: Introductionmentioning

confidence: 99%

Normalized stability time analysis within the boundaries between adults with and without fear of falling

Lee,

Sung

2024

Aging Clin Exp Res

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Assessing postural stability in flatfoot using a time‐in‐boundary method during single‐leg standing

Sung,

Lee

2024

Journal Orthopaedic Research

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Flatfoot, a foot deformity characterized by the collapse of the arch, significantly impacts an individual's balance and stability. This study explored postural adjustments and sway excursions in individuals with and without flatfoot using the Time‐in‐Boundary method. This method assessed relative stability by exploring various center of pressure radius thresholds during three trials of single‐leg stance. We observed significant interactions in threshold levels (F = 4.37, p = 0.04) and normalized relative stable times (F = 7.64, p = 0.01), particularly in the initial trials. Initially, the flatfoot group showed marked decreases in stable times at 10 mm, 15 mm, and 20 mm thresholds, which expanded to 25 mm and 30 mm in subsequent trials. Despite a significant decrease in stability at the 30 mm threshold in early trials, participants exhibited improved stability control as trials progressed. This enhancement likely reflects a combination of a learning effect and an increased understanding of the task requirements, underscoring the adaptability of postural control systems to the biomechanical challenges posed by flatfoot. The Time‐in‐Boundary method has proven to be an effective tool for clinicians to assess postural control, playing a vital role in developing customized rehabilitation strategies for individuals with flatfoot.

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Postural adaptations within normalized stability between older adults with and without chronic low back pain

Lee,

Sung

2023

Eur Spine J

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Effects of dual-tasking on time-to-boundary during stance in people with PD: A preliminary study

Cited by 11 publications

References 40 publications

Normalized stability time analysis within the boundaries between adults with and without fear of falling

Normalized stability time analysis within the boundaries between adults with and without fear of falling

Assessing postural stability in flatfoot using a time‐in‐boundary method during single‐leg standing

Postural adaptations within normalized stability between older adults with and without chronic low back pain

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