Dataset Information

Standing Balance and Spatiotemporal Aspects of Gait Are Impaired Upon Nocturnal Awakening in Healthy Late Middle-Aged and Older Adults.

ABSTRACT: STUDY OBJECTIVESNocturnal awakenings may constitute a unique risk for falls among older adults. We describe differences in gait and balance between presleep and midsleep testing, and whether changes in the lighting environment during the midsleep testing further affect gait and balance.METHODSTwenty-one healthy, late middle-aged and older (64.7 ± 8.0 y) adults participated in this repeated-measures design consisting of four overnight laboratory stays. Each night, participants completed baseline visual acuity, gait, and balance testing. After a 2-h sleep opportunity, they were awakened for 13 min into one of four lighting conditions: very dim white light (< 0.5 lux); dim white light (?28.0 lux); dim orange light (?28.0 lux); and white room-level light (?200 lux). During this awakening, participants completed the same sequence of testing as at baseline.RESULTSLow-contrast visual acuity significantly decreased with decreasing illuminance conditions (F(3,45) = 98.26, p < 0.001). Our a priori hypothesis was confirmed in that variation in stride velocity and center of pressure path length were significantly worse during the mid-sleep awakening compared to presleep baseline. Lighting conditions during the awakening, however, did not influence these parameters. In exploratory analyses, we found that over one-third of the tested gait and balance parameters were significantly worse at the midsleep awakening as compared to baseline (p < 0.05), and nearly one-quarter had medium to large effect sizes (Cohen d ? 0.5; r ? 0.3).CONCLUSIONSBalance and gait are impaired during midsleep awakenings among healthy, late middle-aged and older adults. This impairment is not ameliorated by exposure to room lighting, when compared to dim lights.

SUBMITTER: McBean AL

PROVIDER: S-EPMC5078702 | biostudies-literature | 2016 Nov

REPOSITORIES: biostudies-literature

ACCESS DATA

Publications

Standing Balance and Spatiotemporal Aspects of Gait Are Impaired Upon Nocturnal Awakening in Healthy Late Middle-Aged and Older Adults.

McBean Amanda L AL Najjar Raymond P RP Schuchard Ronald A RA Hall Courtney D CD Wang Cheng-Ann CA Ku Ban B Zeitzer Jamie M JM

Journal of clinical sleep medicine : JCSM : official publication of the American Academy of Sleep Medicine 20161115 11

<h4>Study objectives</h4>Nocturnal awakenings may constitute a unique risk for falls among older adults. We describe differences in gait and balance between presleep and midsleep testing, and whether changes in the lighting environment during the midsleep testing further affect gait and balance.<h4>Methods</h4>Twenty-one healthy, late middle-aged and older (64.7 ± 8.0 y) adults participated in this repeated-measures design consisting of four overnight laboratory stays. Each night, participants c ...[more]

PMID: 27448415

Similar Datasets

Project description:Balance training aims to improve balance and transfer acquired skills to real-life tasks. How older adults adapt gait to different conditions, and whether these adaptations are altered by balance training, remains unclear. We hypothesized that reorganization of modular control of muscle activity is a mechanism underlying adaptation of gait to training and environmental constraints. We investigated the transfer of standing balance training, shown to enhance unipedal balance control, to gait and adaptations in neuromuscular control of gait between normal and narrow-base walking in twenty-two older adults (72.6 ± 4.2 years). At baseline, after one, and after ten training sessions, kinematics and EMG of normal and narrow-base treadmill walking were measured. Gait parameters and temporal activation profiles of five muscle synergies were compared between time-points and gait conditions. Effects of balance training and an interaction between training and gait condition on step width were found, but not on synergies. After ten training sessions step width decreased in narrow-base walking, while step width variability decreased in both conditions. Trunk center of mass displacement and velocity, and the local divergence exponent, were lower in narrow-base compared to normal walking. Activation duration in narrow-base compared to normal walking was shorter for synergies associated with dominant leg weight acceptance and non-dominant leg stance, and longer for the synergy associated with non-dominant heel-strike. Time of peak activation associated with dominant leg stance occurred earlier in narrow-base compared to normal walking, while it was delayed in synergies associated with heel-strikes and non-dominant leg stance. The adaptations of synergies to narrow-base walking may be interpreted as related to more cautious weight transfer to the new stance leg and enhanced control over center of mass movement in the stance phase. The improvement of gait stability due to standing balance training is promising for less mobile older adults.

Project description:Study objectivesOur aim was to evaluate the effect of lemborexant versus zolpidem tartrate extended release 6.25 mg (ZOL) or placebo (PBO) on postural stability, auditory awakening threshold (AAT), and cognitive performance (cognitive performance assessment battery [CPAB]).MethodsHealthy women (≥ 55 years) and men (≥ 65 years) were randomized, double-blind, to 1 of 4-period, single-dose crossover sequences, starting with lemborexant 5 mg (LEM5), 10 mg (LEM10), ZOL, or PBO. A ≥ 14-day washout followed all 4 treatments. Assessments were middle-of-the-night (MOTN) change from baseline in postural stability (primary prespecified comparison: LEM vs ZOL), AAT, absolute AAT, and CPAB for LEM5 and LEM10 versus ZOL and PBO; and morning change from baseline in postural stability and CPAB for LEM5 and LEM10 versus ZOL and PBO. Change from baseline measures were time-matched to a baseline night/morning when no study drug was administered.ResultsMOTN: Mean MOTN change from baseline in body sway was significantly higher for ZOL versus both lemborexant doses. There were no differences among the treatments regarding decibels required to awaken a participant. LEM5 was not statistically different from PBO on any CPAB domain; LEM10 and ZOL showed poorer performance on some tests of attention and/or memory. Morning: Body sway and cognitive performance following LEM5 or LEM10 did not differ from PBO; body sway was significantly higher for ZOL than PBO. Rates of treatment-emergent adverse events were low; there were no serious adverse events.ConclusionsLemborexant causes less postural instability than a commonly used sedative-hypnotic and does not impair the ability to awaken to auditory signals.Clinical trials registrationRegistry: ClinicalTrials.gov; Name: Crossover Study to Evaluate the Effect of Lemborexant Versus Placebo and Zolpidem on Postural Stability, Auditory Awakening Threshold, and Cognitive Performance in Healthy Subjects 55 Years and Older; URL: https://clinicaltrials.gov/ct2/show/NCT03008447; Identifier: NCT03008447.

Project description:BACKGROUND:Compensatory stepping thresholds evaluate the response to postural disturbances. Although such fall-recovery measures are a promising indicator of fall risk, the relationships between stepping thresholds and other measures used to predict falls are not well established. RESEARCH QUESTION:We sought to quantify the relationships between stepping thresholds and other measurements used to assess fall risk in older women, a population at high risk for falls and related injuries, including fractures. METHODS:We studied 112 ambulatory, community-dwelling women, age 65 years or older. Using a treadmill to deliver standing postural disturbances, we determined anterior and posterior single-stepping and multiple-stepping thresholds. These thresholds represented the magnitude of the disturbance that elicited one step or more than one step, respectively. We also assessed balance confidence, functional reach, unipedal stance time, isometric strength, obstacle crossing, postural sway, and gait kinematics. Outcomes were normalized to body size. RESULTS:After accounting for age, stepping thresholds were, at most, moderately correlated (Pearson partial correlation coefficients r?=?0.20 to 0.40 and r = -0.21 to -0.31) to several assessments of gait, postural control, and strength. Approximately 24-52% of the variance in stepping thresholds was explained by a combination of age and other fall risk assessments, which frequently consisted of balance confidence, unipedal stance time, obstacle crossing, the Romberg ratio of postural sway, and/or strength. SIGNIFICANCE:Our results suggest that anteroposterior fall-recovery ability, as assessed by stepping thresholds, can only be partially inferred from age and a combination of assessments of sway, strength, unipedal tasks, and balance confidence. Compensatory stepping thresholds may provide information on stability maintenance unique from other assessments of fall risk. Further investigation would be necessary to determine whether stepping thresholds are better predictors of falls in older women.

Dataset Information

Standing Balance and Spatiotemporal Aspects of Gait Are Impaired Upon Nocturnal Awakening in Healthy Late Middle-Aged and Older Adults.

Publications

Standing Balance and Spatiotemporal Aspects of Gait Are Impaired Upon Nocturnal Awakening in Healthy Late Middle-Aged and Older Adults.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets