Reliability of center of pressure measures within and between sessions in individuals post-stroke and healthy controls

Gray, Vicki L.; Ivanova, Tanya D.; Garland, S. Jayne

doi:10.1016/j.gaitpost.2014.03.191

Cited by 54 publications

(54 citation statements)

References 27 publications

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“…It was expected that lower ICC values would be observed in post-stroke subjects since they exhibit a higher variability inherent to deficits in postural control (Roerdink et al, 2006). Similar to the findings of Gray et al (2014), the values of within session reliability of the retest were lower as compared to those found in the test session. Possible causes could be related to the attention invested in the task and learning effects.…”

Section: Retestmentioning

confidence: 52%

“…Despite their potential clinical applicability, to the best of the authors' knowledge, studies have not examined the reliability and minimal detectable change (MDC) of the synchronization and amplitude of postural sway in post-stroke patients. Gray et al (2014) evaluated the within and between sessions reliability of the amplitude of postural sway of each foot as independent entities, and Eng and Chu (2002) and Gasq et al (2014) examined the weight-bearing symmetry. However, these studies did not investigate the MDC of the aforementioned measures.…”

Section: Introductionmentioning

confidence: 99%

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Reliability and minimal detectable change of between-limb synchronization, weight-bearing symmetry, and amplitude of postural sway in individuals with stroke

et al. 2017

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Introduction: Recently, variables related to between-limb synchronization of the centers of pressure (COP) have been proposed as measures of postural control in post-stroke patients. Although it is crucial in verifying their potential clinical use, the reliability of these variables is unknown. The aim of this work was to determine the reliability and minimal detectable change (MDC) of the peak of synchronization (ρ max ) in the anteroposterior (AP) and mediolateral (ML) directions, the time lag for the peak (ρ max lag), synchronization at lag zero (ρ 0 ), weight-bearing symmetry, and amplitude of postural sway, measured as the root mean square (RMS) values of the COP displacements in both directions (AP and ML COP displacement). Methods: COP data of 16 participants with stroke were collected at quiet standing with two force plates at two sessions separated by 2 to 7 days. The procedure was repeated three times in each session. The within and between sessions reliability was determined by the intraclass correlation coefficient (ICC), and the MDC was obtained from the ICC between sessions. Results: The variables ρ max lag in the AP and ML directions, as well as ρ 0 in the AP direction, exhibited poor within session reliability (ICC ≤ 0.4). The findings revealed excellent within and between sessions reliability (ICC ≥ 0.89) for weight-bearing symmetry and the RMS displacement in the AP direction, with MDC values of 5% and 2.07 mm, respectively. The remaining variables exhibited moderate reliability. Conclusion: Weight-bearing symmetry and AP COP displacement can be considered reliable variables for use in clinical practice.

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Section: Retestmentioning

confidence: 52%

Section: Introductionmentioning

confidence: 99%

Reliability and minimal detectable change of between-limb synchronization, weight-bearing symmetry, and amplitude of postural sway in individuals with stroke

et al. 2017

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“…2C for pressure sensor data). COP velocity, as a measure of the mean speed of the COP, represents a highly reliable parameter of postural control in healthy older adults (Lin et al, 2008; Moghadam et al, 2011), as well as in patients with neurological conditions (Gray et al, 2014; Tamburella et al, 2014). In line with the fNIRs data, the sampling interval of the COP velocity during the eight-second recording was set at 500 ms.…”

Section: Methodsmentioning

confidence: 99%

The role of prefrontal cortex during postural control in Parkinsonian syndromes a functional near-infrared spectroscopy study

et al. 2016

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Postural instability represents a main source of disability in Parkinsonian syndromes and its pathophysiology is poorly understood. Indirect probes (i.e., mental imagery) of brain involvement support the role of prefrontal cortex as a key cortical region for postural control in older adults with and without Parkinsonian syndromes. Using functional near infrared spectroscopy (fNIRs) as a direct online cortical probe, this study aimed to compare neural activation patterns in prefrontal cortex, postural stability, and their respective interactions, in (1) patients with Parkinsonian syndromes; (2) those with mild parkinsonian signs; (3) and healthy older adults. Among 269 nondemented older adults (76.41±6.70 years, 56% women), 26 individuals presented with Parkinsonian syndromes (Unified Parkinson's disease rating scale (UPDRS): 11.08±3.60), 117 had mild parkinsonian signs (UPDRS: 3.21±2.49), and 126 individuals were included as a healthy control group. Participants were asked to stand upright and count silently for ten seconds while changes in oxygenated hemoglobin levels over prefrontal cortex were measured using fNIRs. We simultaneously evaluated postural stability with center of pressure velocity data recorded on an instrumented walkway. Compared to healthy controls and patients with mild parkinsonian signs, patients with Parkinsonian syndromes demonstrated significantly higher prefrontal oxygenation levels to maintain postural stability. The pattern of brain activation and postural control of participants with mild parkinsonian signs were similar to that of normal controls. These findings highlight the online role of the prefrontal cortex in postural control in patients with Parkinsonian syndromes and afford the opportunity to improve therapeutic options for postural instability.

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“…All balance trials were 15 seconds long and involved standing as still as possible on a force plate, with their arms at their sides and their feet shoulder-width apart, while looking at a tape "X" on the wall in front of them. This test duration is long enough to be reliable (13,14), and short enough so that the effects of the spinning would be captured. All testing was performed in a quiet room with no visual or auditory distractions.…”

Section: Protocolmentioning

confidence: 99%

Regulation of Balance After Spinning: A Comparison Between Figure Skaters and Controls

Baker

Barkwell

2016

WURJ:HNS

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Introduction: The purpose of the present study was to compare the balance performance of control subjects and varsity figure skaters after spinning on a turntable for 6 seconds. It was hypothesized figure skaters would demonstrate better balance control after spinning. Methods: 9 female figure skaters and 9 female control subjects stood as still as possible for 15 seconds on a Kistler force plate during both a control condition and after spinning for 6 seconds on a turntable. Balance performance was quantified by the percentage of total time the center of pressure (CoP) was within a 5mm radius of the center of their base of support (BoS). Results: In the control condition, figure skaters and control participants did not have significantly different balance ability. In the post-spin condition, figure skaters were significantly better at maintaining their CoP within a smaller area. Conclusions: These results are valuable from a training and coaching perspective because they suggest that balance performance after spinning can be improved with training.

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Reliability of center of pressure measures within and between sessions in individuals post-stroke and healthy controls

Cited by 54 publications

References 27 publications

Reliability and minimal detectable change of between-limb synchronization, weight-bearing symmetry, and amplitude of postural sway in individuals with stroke

Reliability and minimal detectable change of between-limb synchronization, weight-bearing symmetry, and amplitude of postural sway in individuals with stroke

The role of prefrontal cortex during postural control in Parkinsonian syndromes a functional near-infrared spectroscopy study

Regulation of Balance After Spinning: A Comparison Between Figure Skaters and Controls

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