The effect of post-stroke lower-limb spasticity on the control of standing balance: Inter-limb spatial and temporal synchronisation of centres of pressure

Singer, Jonathan C.; Mansfield, Avril; Danells, Cynthia; McIlroy, William E.; Mochizuki, George

doi:10.1016/j.clinbiomech.2013.07.010

Cited by 27 publications

(35 citation statements)

References 34 publications

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“…Other studies on synchronization are more relevant in the clinical context and find an association between this measure and the risk of falls (Mansfield et al, 2012) and limb spasticity (Singer et al, 2013). Mansfield et al (2012) observed that stroke patients that fell exhibited lower levels of synchronization as compared to those who did not have a tendency to fall; a significant correlation between synchronization and the score according to the Berg Balance Scale was found.…”

Section: Introductionmentioning

confidence: 96%

“…Mansfield et al (2012) observed that stroke patients that fell exhibited lower levels of synchronization as compared to those who did not have a tendency to fall; a significant correlation between synchronization and the score according to the Berg Balance Scale was found. Singer et al (2013) reported that patients exhibiting spasticity demonstrated decreased synchronization as compared to individuals without spasticity. Therefore, between-limb synchronization of COP trajectories is a plausible measure to assess therapeutic measures aimed at reducing the risk of falls and spasticity.…”

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: Introductionmentioning

confidence: 96%

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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“…The purpose of this study was to determine whether changes in inter-limb postural synchronization prior to bouts of postural instability are indicative of modulation in postural set. Consistent with studies identifying modifiability in pre-perturbation cortical activity related to postural set alteration [10] and because high inter-limb synchrony may contribute to optimal balance control in quiet standing [14,16,18,19], we hypothesized that inter-limb synchrony would be highest when perturbation magnitudes were predictable and of low magnitude. Conversely, when the parameters of instability were unpredictable and required the execution of compensatory stepping responses, we expected a reduction in inter-limb synchronization (i.e.…”

Section: Introductionmentioning

confidence: 78%

“…The cross-correlation function was calculated using the left and right mean-removed AP and ML COP waveforms. Cross-correlation coefficients at zero phase-lag (R xy (0)) were calculated at incremental phase-shifts defined by the sampling rate, by iteratively shifting the right limb COP forwards and backwards in time over the entire length of the record [19], over the 3 s duration prior to perturbation. Similarly, for baseline measures of standing balance, R xy (0) were also calculated for quiet standing over a 30 s duration.…”

Section: Discussionmentioning

confidence: 99%

“…depending on whether the conditions under which postural instability is experienced are known or familiar) [15]. The extent of inter-limb synchronization of COP displacements reflects the coordination of muscle activation patterns between limbs [16] and is a sensitive measure of balance control [17][18][19]. Thus, measuring the extent of between-limb coordination in advance of postural instability may enhance understanding of the processes by which humans prepare for and optimize balance-correcting responses.…”

Section: Introductionmentioning

confidence: 99%

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The effects of predictability on inter-limb postural synchronization prior to bouts of postural instability

2016

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Locomotion and Posture in Older Adults

Barbieri

Vitório

2017

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The effect of post-stroke lower-limb spasticity on the control of standing balance: Inter-limb spatial and temporal synchronisation of centres of pressure

Cited by 27 publications

References 34 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 effects of predictability on inter-limb postural synchronization prior to bouts of postural instability

Locomotion and Posture in Older Adults

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