407. Evaluation of Workers' Postural Stability on Slippery Surfaces During Task Performance

1999 ◽  
Author(s):  
S. Chiou ◽  
A. Bhattacharya ◽  
P. Succop
Keyword(s):  
Task Performance ◽  
Postural Stability

The Effect of Holding an Object on Postural Stability and Suprapostural Task Performance

2019 ◽  
Vol 35 (6) ◽  
pp. 418-425
Author(s):  
Joshua J. Liddy ◽  
Amanda J. Arnold ◽  
HyeYoung Cho ◽  
Nathaniel L. Romine ◽  
Jeffrey M. Haddad
Keyword(s):  
Task Performance ◽  
Postural Stability ◽  
Postural Sway ◽  
Quiet Standing ◽  
Dominant Hand ◽  
Standing Posture ◽  
Manual Task ◽  
Highly Sensitive ◽  
Suprapostural Task ◽  
Error Count

Holding an object has been found to reduce postural sway during quiet standing. However, people normally stand to accomplish suprapostural goals, such as fitting a key into a lock. Postural control should therefore be assessed by examining postural outcomes in the context of suprapostural task performance. This study assessed whether holding an object increased standing postural stability and improved the performance of a concurrent precision manual task. A total of 15 young adults performed a precision manual task with their dominant hand while holding or not holding an object in their nondominant hand. Postural stability was assessed using measures of postural sway and time to boundary. Suprapostural task performance was assessed as an error count. Holding did not influence postural sway or suprapostural task performance. Discrepancies among previous studies coupled with the present findings suggest that the effects of holding an object on standing posture are highly sensitive to the experimental context. The authors provide several explanations for their findings and discuss the limitations of previous suggestions that holding an object may have clinical relevance for balance-compromised populations.

scholarly journals Quantification of Dual-task Performance in Healthy Young Adults Suitable for Military Use

2021 ◽  
Vol 186 (Supplement_1) ◽  
pp. 58-64
Author(s):  
Amanda L Penko ◽  
Susan M Linder ◽  
Mandy Miller Koop ◽  
Tanujit Dey ◽  
Jay L Alberts
Keyword(s):  
Young Adults ◽  
Task Performance ◽  
Dual Task ◽  
Postural Stability ◽  
Stimulus Presentation ◽  
Eyes Closed ◽  
Number Discrimination ◽  
Dual Task Performance ◽  
Eyes Open ◽  
Task Conditions

ABSTRACT Introduction Dual-task performance, in which an individual performs two tasks simultaneously, is compromised following mild traumatic brain injury (mTBI). Proficient dual-task performance is essential in a military setting for both military member safety and execution of skilled tasks. To address the unique needs of military members, a portable dual-task assessment was developed incorporating an auditory dual-task task as a novel assessment module utilizing mobile-device technology. The aim of this study was to develop and validate a dual-task mobile device-based application that accurately quantifies cognitive and motor function. Materials and Methods Fifty, healthy, military-age civilians completed three cognitive tasks in single- and dual-task conditions with eyes open and closed: visual Stroop, auditory Stroop at 1.5- and 2.5-second stimulus presentation, and number discrimination. All dual-task conditions required the maintenance of postural stability while simultaneously completing a cognitive task. Results There were no differences between single- and dual-task conditions for cognitive performance on any of the tests, and a ceiling effect was observed for the visual Stroop and auditory Stroop 1.5-second stimulus presentation (P > .05). Significant differences in postural stability were observed between the eyes-open and eyes-closed conditions in all single- and dual-task conditions (P < .01). Significant differences in postural stability were observed between the eyes-open single-task condition and all dual-task conditions (P < .01). Conclusions Based on the performance of healthy young adults, the number discrimination task may be optimal for detecting subtle changes in dual-task performance. The detected differences found between the eyes-open and eyes-closed conditions provide discriminatory value and insight into the reliance of vision of postural stability performance. While dual-task cognitive performance was not observed in this healthy population, individuals with mTBI may exhibit decreased dual-task performance. The independent evaluation of cognitive and motor function under dual-task conditions has the potential to transform the management and treatment of mTBI.

Effects of a Dynamic Seat Pan on Torso Movement, Back Comfort, and Task Performance

2007 ◽  
Vol 51 (8) ◽  
pp. 544-548
Author(s):  
E. Lawler ◽  
A. Hedge
Keyword(s):  
Back Pain ◽  
Task Performance ◽  
Postural Stability ◽  
Personal Control ◽  
Postural Instability ◽  
Task Demands ◽  
Comfort Level ◽  
And Task

Thirty-six subjects, half with back pain, performed 1-hour sessions, including 3 × 10-minute tasks separated by 2 × 10-minute relaxation tasks, while sitting on both a static seat (SS) and a rotary dynamic seat (DS) at fixed speed. Ss torso movement was greater for the DS condition (p=.000) and while performing active versus passive tasks (p=.000). However, personal comfort measures for postural stability (p<.000), postural instability (p<.003), limitations in writing and typing (p<.001), feelings of nausea (p<.023), and dizziness (p<.024) were worse for the DS condition than for the SS condition. The DS did not significantly affect task performance or back pain. Ss without pre-existing back pain made more negative than positive comments on the chair's motion than those with back pain. Allowing intermittent use of the DS with personal control of the speed of rotation according to task demands and comfort level, may afford some benefits.

Postural stability assessment during task performance

1998 ◽  
Vol 1 (1) ◽  
pp. 41-53 ◽  
Author(s):  
Angshuman Bagchee ◽  
Amit Bhattacharya ◽  
Paul A. Succop ◽  
Ronald Emerich
Keyword(s):  
Task Performance ◽  
Postural Balance ◽  
Postural Stability ◽  
Basal Area ◽  
Postural Instability ◽  
Body Sway ◽  
Industrial Workers ◽  
Stability Assessment ◽  
The Subject ◽  
Performance Interventions

The methodology described here presents quantitative measures of estimating the severity of postural instability based on the proximity and spread of body sway in relation to the basal area of support. A simplified functional basal area of support is determined based on the maximal forward reaching ability of the subject. Three non-dimensional indices for quantitating the potential of postural instability are introduced. Application of this method is illustrated through an experiment with ten healthy industrial workers performing four different tasks. The results indicate that these indices are reproducible, sensitive to task performance and can be utilized to estimate the postural stability associated with each task. Application of this method would include the identification of factors, both intrinsic and extrinsic, that contribute to the maintenance of postural balance during task performance. Interventions can then be evaluated using this method.

Effects of Concurrent Manual Task Performance on Connected Speech Acoustics in Individuals With Parkinson Disease

2019 ◽  
Vol 62 (7) ◽  
pp. 2099-2117 ◽  
Author(s):  
Jason A. Whitfield ◽  
Zoe Kriegel ◽  
Adam M. Fullenkamp ◽  
Daryush D. Mehta
Keyword(s):  
Task Performance ◽  
Speech Production ◽  
Dual Task ◽  
Motor Task ◽  
Task Condition ◽  
Connected Speech ◽  
Speech Acoustics ◽  
Single Task ◽  
Manual Task ◽  
Task Conditions

Purpose Prior investigations suggest that simultaneous performance of more than 1 motor-oriented task may exacerbate speech motor deficits in individuals with Parkinson disease (PD). The purpose of the current investigation was to examine the extent to which performing a low-demand manual task affected the connected speech in individuals with and without PD. Method Individuals with PD and neurologically healthy controls performed speech tasks (reading and extemporaneous speech tasks) and an oscillatory manual task (a counterclockwise circle-drawing task) in isolation (single-task condition) and concurrently (dual-task condition). Results Relative to speech task performance, no changes in speech acoustics were observed for either group when the low-demand motor task was performed with the concurrent reading tasks. Speakers with PD exhibited a significant decrease in pause duration between the single-task (speech only) and dual-task conditions for the extemporaneous speech task, whereas control participants did not exhibit changes in any speech production variable between the single- and dual-task conditions. Conclusions Overall, there were little to no changes in speech production when a low-demand oscillatory motor task was performed with concurrent reading. For the extemporaneous task, however, individuals with PD exhibited significant changes when the speech and manual tasks were performed concurrently, a pattern that was not observed for control speakers. Supplemental Material https://doi.org/10.23641/asha.8637008

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