Concurrent validity between a portable force plate and instrumented walkway when measuring limits of stability

Berg‐Poppe, Patti; Cesar, Guilherme M.; Tao, Hanz; Johnson, Cal; Landry, Jessica

doi:10.12968/ijtr.2018.25.6.272

Cited by 6 publications

(3 citation statements)

References 26 publications

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“…The Four Square Step Test was performed on a 1.22 m by 1.22 m area of an electronic mat acquiring data at 120 Hz (Zeno Walkway; ProtoKinetics, Haverton, PA, USA) and recorded with the instrument’s software (PKMAS). The system has been validated both for spatiotemporal parameters and center of pressure [ 21 , 22 ] and has previously been used to analyze the Timed-Up-and-Go in subjects with unilateral lower-limb amputation [ 23 ]. Algorithms implemented into the software automatically processed the iFSST, identified the four squares and the successive left/right footprints, then provides spatiotemporal aspects of the footsteps and information about the stepping pattern.…”

Section: Methodsmentioning

confidence: 99%

Instrumented Four Square Step Test in Adults with Transfemoral Amputation: Test-Retest Reliability and Discriminant Validity between Two Types of Microprocessor Knees

Gouelle

Highsmith

2020

Sensors

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Technology-based outcomes have recently been proposed to complement the standard Four Square Step Test (FSST) by providing a decomposition of the sequences and information about the stepping pattern. A test-retest study and a randomized crossover design have been used to determine immediate test-retest reliability and to assess discriminant validity, in persons with a unilateral transfemoral amputation, for the parameters computed by an instrumented version of the Four Square Step Test. Twenty adults, independent and unlimited community ambulators, with a unilateral transfemoral amputation, performed two Four Square Step Tests on a pressure mat first with a microprocessor knee, then, a few weeks later with another one. One of these prosthetic knees was acknowledged to be superior and to provide functional improvement. Test-retest, intraclass correlation coefficients and minimal detectable change at 95% confidence level were calculated for each variable. Paired samples t-tests were then used to identify differences between the two microprocessor knee systems. The test-retest reliability of most outcome measures was good to excellent. Few variables showed a systematic difference and a trend to improve between test 1 and test 2. When comparing both microprocessor knees, significant differences in the expected direction were observed, with interpretation in accordance with a functional improvement. Importantly, we highlighted that various strategies to improve the performance in the test might complexify the interpretation of the most detailed measurement. The instrumented Four Square Step test provides reliable measures with satisfactory test-retest reliability and discriminant validity in persons with unilateral transfemoral amputation.

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Section: Methodsmentioning

confidence: 99%

Instrumented Four Square Step Test in Adults with Transfemoral Amputation: Test-Retest Reliability and Discriminant Validity between Two Types of Microprocessor Knees

Gouelle

Highsmith

2020

Sensors

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“…The gait and balance analyses were performed using the PKMAS software package (v.509C3; ProtoKinetics, Havertown, PA) . Primary gait outcome measures were selected to summarize the following 5 independent domains of gait: pace, velocity (cm/s) and step length (cm); rhythm, step time (seconds); variability, coefficient of variation (%) of step length; asymmetry, step time asymmetry (seconds; ie, the difference in step time between the left and right steps) and step length asymmetry (ie, the left–right step length); postural control, step width and step width coefficient of variation (%).…”

Section: Methodsmentioning

confidence: 99%

“…The gait and balance analyses were performed using the PKMAS software package (v.509C3; ProtoKinetics, Havertown, PA). 13,14 Primary gait outcome measures were selected to summarize the following 5 independent domains of gait: pace, velocity (cm/s) and step length (cm); rhythm, step time (seconds); variability, coefficient of variation (%) of step length; asymmetry, step time asymmetry (seconds; ie, the difference in step time between the left and right steps) and step length asymmetry (ie, the left-right step length); postural control, step width and step width coefficient of variation (%). To capture a summary of the participants' balance impairments, the following outcome measures were calculated during the eyes-open and eyes-closed trials: x and y range (cm), anterior-posterior and mediolateral root mean square of the center or pressure (COP) displacement (cm), mean COP length (cm), COP velocity (cm/s), and max COP velocity (cm/s).…”

Section: R B D P a T I E N T S H A V E S U B T L E G A I T I M P A mentioning

confidence: 99%

Subtle gait and balance impairments occur in idiopathic rapid eye movement sleep behavior disorder

et al. 2019

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Background Although motor abnormalities have been flagged as potentially the most sensitive and specific clinical features for predicting the future progression to Parkinson's disease, little work has been done to characterize gait and balance impairments in idiopathic rapid eye movement sleep behavior disorder (iRBD). Objective The objective of this study was to quantitatively determine any static balance as well as gait impairments across the 5 independent domains of gait in polysomnography‐confirmed iRBD patients using normal, fast‐paced, and dual‐task walking conditions. Methods A total of 38 participants (24 iRBD, 14 healthy controls) completed the following 5 different walking trials across a pressure sensor carpet: (1) normal pace, (2) fast pace, (3) while counting backward from 100 by 1s, (4) while naming as many animals as possible, (5) while subtracting 7s from 100. Results Although no gait differences were found between the groups during normal walking, there were significant differences between groups under the fast‐paced and dual‐task gait conditions. Specifically, in response to the dual tasking, healthy controls widened their step width without changing step width variability, whereas iRBD patients did not widen their step width but, rather, significantly increased their step width variability. Similarly, changes between the groups were observed during fast‐paced walking wherein the iRBD patients demonstrated greater step length asymmetry when compared with controls. Conclusions This study demonstrates that iRBD patients have subtle gait impairments, which likely reflect early progressive degeneration in brainstem regions that regulate both REM sleep and gait coordination. Such gait assessments may be useful as a diagnostic preclinical screening tool for future fulminant gait abnormalities for trials of disease‐preventive agents. © 2019 International Parkinson and Movement Disorder Society

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Stepping over multiple obstacles changes the pattern of foot integrated pressure of the leading and trailing legs

Wang

Chien

Siu

2020

Journal of Biomechanics

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Concurrent validity between a portable force plate and instrumented walkway when measuring limits of stability

Cited by 6 publications

References 26 publications

Instrumented Four Square Step Test in Adults with Transfemoral Amputation: Test-Retest Reliability and Discriminant Validity between Two Types of Microprocessor Knees

Instrumented Four Square Step Test in Adults with Transfemoral Amputation: Test-Retest Reliability and Discriminant Validity between Two Types of Microprocessor Knees

Subtle gait and balance impairments occur in idiopathic rapid eye movement sleep behavior disorder

Stepping over multiple obstacles changes the pattern of foot integrated pressure of the leading and trailing legs

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