Relationships between dual-task related changes in stride velocity and stride time variability in healthy older adults

Véronique Dubost, Reto W. Kressig, Régis Gonthier, François R. Herrmann, Kamiar Aminian, Bijan Najafi, Olivier Beauchet

Research output: Contribution to journalArticle

134 Citations (Scopus)

Abstract

Dual-task related gait changes have been previously reported for healthy older adults, suggesting that gait control requires attention. Compared to balance control, the involvement of attention in the control of the rhythmic stepping mechanism, as reflected by stride time variability, is not well known. In particular, under dual-task, the relative contributions of a second, attention-demanding task and changes in walking speed remain unclear. Thus, the aims of this study were (1) to assess whether walking with a slow-selected speed or walking while performing an attention-demanding task affected stride time variability in a sample of healthy older participants, and (2) to establish whether stride time variability under dual-task conditions is related either to the decrease of walking speed or the simultaneous attention-demanding task, or to both. Forty-five healthy older participants performed four experimental conditions: (1) walking at a normal self-selected speed, (2) walking at a slow self-selected speed, (3) performing a verbal fluency task when sitting on a chair, and (4) performing the verbal fluency task while walking at self-selected walking speed. Gait parameters were recorded across 15 meters, using Physilog®. Results showed a significant dual-task related decrease in mean values of stride velocity, as well as a significant increase in mean values and coefficients of variation of stride time. These dual-task related changes in stride time were explained by the simultaneous performance of the verbal fluency task, the decrease of gait speed and the variability between participants. Although a relationship exists between decreased walking speed and increased stride time variability, the dual-task related increase of stride time variability was also significantly associated with the attention-demanding task, suggesting some attentional control for the rhythmic stepping mechanism of walking in healthy older adults.

Original languageEnglish (US)
Pages (from-to)372-382
Number of pages11
JournalHuman Movement Science
Volume25
Issue number3
DOIs
StatePublished - Jun 2006
Externally publishedYes

Fingerprint

Walking
Gait
Healthy Volunteers
Walking Speed
time
performance

Keywords

  • Dual-task
  • Older adult
  • Stride variability
  • Walking speed

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Experimental and Cognitive Psychology
  • Neuropsychology and Physiological Psychology
  • Human Factors and Ergonomics

Cite this

Relationships between dual-task related changes in stride velocity and stride time variability in healthy older adults. / Dubost, Véronique; Kressig, Reto W.; Gonthier, Régis; Herrmann, François R.; Aminian, Kamiar; Najafi, Bijan; Beauchet, Olivier.

In: Human Movement Science, Vol. 25, No. 3, 06.2006, p. 372-382.

Research output: Contribution to journalArticle

Dubost, Véronique ; Kressig, Reto W. ; Gonthier, Régis ; Herrmann, François R. ; Aminian, Kamiar ; Najafi, Bijan ; Beauchet, Olivier. / Relationships between dual-task related changes in stride velocity and stride time variability in healthy older adults. In: Human Movement Science. 2006 ; Vol. 25, No. 3. pp. 372-382.
@article{9db2a1dec4bd4c338f28e35f93f3ec0e,
title = "Relationships between dual-task related changes in stride velocity and stride time variability in healthy older adults",
abstract = "Dual-task related gait changes have been previously reported for healthy older adults, suggesting that gait control requires attention. Compared to balance control, the involvement of attention in the control of the rhythmic stepping mechanism, as reflected by stride time variability, is not well known. In particular, under dual-task, the relative contributions of a second, attention-demanding task and changes in walking speed remain unclear. Thus, the aims of this study were (1) to assess whether walking with a slow-selected speed or walking while performing an attention-demanding task affected stride time variability in a sample of healthy older participants, and (2) to establish whether stride time variability under dual-task conditions is related either to the decrease of walking speed or the simultaneous attention-demanding task, or to both. Forty-five healthy older participants performed four experimental conditions: (1) walking at a normal self-selected speed, (2) walking at a slow self-selected speed, (3) performing a verbal fluency task when sitting on a chair, and (4) performing the verbal fluency task while walking at self-selected walking speed. Gait parameters were recorded across 15 meters, using Physilog{\circledR}. Results showed a significant dual-task related decrease in mean values of stride velocity, as well as a significant increase in mean values and coefficients of variation of stride time. These dual-task related changes in stride time were explained by the simultaneous performance of the verbal fluency task, the decrease of gait speed and the variability between participants. Although a relationship exists between decreased walking speed and increased stride time variability, the dual-task related increase of stride time variability was also significantly associated with the attention-demanding task, suggesting some attentional control for the rhythmic stepping mechanism of walking in healthy older adults.",
keywords = "Dual-task, Older adult, Stride variability, Walking speed",
author = "V{\'e}ronique Dubost and Kressig, {Reto W.} and R{\'e}gis Gonthier and Herrmann, {Fran{\cc}ois R.} and Kamiar Aminian and Bijan Najafi and Olivier Beauchet",
year = "2006",
month = "6",
doi = "10.1016/j.humov.2006.03.004",
language = "English (US)",
volume = "25",
pages = "372--382",
journal = "Human Movement Science",
issn = "0167-9457",
publisher = "Elsevier",
number = "3",

}

TY - JOUR

T1 - Relationships between dual-task related changes in stride velocity and stride time variability in healthy older adults

AU - Dubost, Véronique

AU - Kressig, Reto W.

AU - Gonthier, Régis

AU - Herrmann, François R.

AU - Aminian, Kamiar

AU - Najafi, Bijan

AU - Beauchet, Olivier

PY - 2006/6

Y1 - 2006/6

N2 - Dual-task related gait changes have been previously reported for healthy older adults, suggesting that gait control requires attention. Compared to balance control, the involvement of attention in the control of the rhythmic stepping mechanism, as reflected by stride time variability, is not well known. In particular, under dual-task, the relative contributions of a second, attention-demanding task and changes in walking speed remain unclear. Thus, the aims of this study were (1) to assess whether walking with a slow-selected speed or walking while performing an attention-demanding task affected stride time variability in a sample of healthy older participants, and (2) to establish whether stride time variability under dual-task conditions is related either to the decrease of walking speed or the simultaneous attention-demanding task, or to both. Forty-five healthy older participants performed four experimental conditions: (1) walking at a normal self-selected speed, (2) walking at a slow self-selected speed, (3) performing a verbal fluency task when sitting on a chair, and (4) performing the verbal fluency task while walking at self-selected walking speed. Gait parameters were recorded across 15 meters, using Physilog®. Results showed a significant dual-task related decrease in mean values of stride velocity, as well as a significant increase in mean values and coefficients of variation of stride time. These dual-task related changes in stride time were explained by the simultaneous performance of the verbal fluency task, the decrease of gait speed and the variability between participants. Although a relationship exists between decreased walking speed and increased stride time variability, the dual-task related increase of stride time variability was also significantly associated with the attention-demanding task, suggesting some attentional control for the rhythmic stepping mechanism of walking in healthy older adults.

AB - Dual-task related gait changes have been previously reported for healthy older adults, suggesting that gait control requires attention. Compared to balance control, the involvement of attention in the control of the rhythmic stepping mechanism, as reflected by stride time variability, is not well known. In particular, under dual-task, the relative contributions of a second, attention-demanding task and changes in walking speed remain unclear. Thus, the aims of this study were (1) to assess whether walking with a slow-selected speed or walking while performing an attention-demanding task affected stride time variability in a sample of healthy older participants, and (2) to establish whether stride time variability under dual-task conditions is related either to the decrease of walking speed or the simultaneous attention-demanding task, or to both. Forty-five healthy older participants performed four experimental conditions: (1) walking at a normal self-selected speed, (2) walking at a slow self-selected speed, (3) performing a verbal fluency task when sitting on a chair, and (4) performing the verbal fluency task while walking at self-selected walking speed. Gait parameters were recorded across 15 meters, using Physilog®. Results showed a significant dual-task related decrease in mean values of stride velocity, as well as a significant increase in mean values and coefficients of variation of stride time. These dual-task related changes in stride time were explained by the simultaneous performance of the verbal fluency task, the decrease of gait speed and the variability between participants. Although a relationship exists between decreased walking speed and increased stride time variability, the dual-task related increase of stride time variability was also significantly associated with the attention-demanding task, suggesting some attentional control for the rhythmic stepping mechanism of walking in healthy older adults.

KW - Dual-task

KW - Older adult

KW - Stride variability

KW - Walking speed

UR - http://www.scopus.com/inward/record.url?scp=33744929405&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33744929405&partnerID=8YFLogxK

U2 - 10.1016/j.humov.2006.03.004

DO - 10.1016/j.humov.2006.03.004

M3 - Article

C2 - 16714067

AN - SCOPUS:33744929405

VL - 25

SP - 372

EP - 382

JO - Human Movement Science

JF - Human Movement Science

SN - 0167-9457

IS - 3

ER -