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Sequential analysis of postural control resource allocation during a dual task test.

Hwang JH, Lee CH, Chang HJ, Park DS - Ann Rehabil Med (2013)

Bottom Line: Less sway was observed during the nonverbal task in a sequential study.The attentional and automatic factors were analyzed during a sequential study.By controlling the postural control factors, optimal parameters and training methods might be used in clinical applications.

View Article: PubMed Central - PubMed

Affiliation: Department of Physical Medicine and Rehabilitation, Center for Clinical Research, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.

ABSTRACT

Objective: To investigate the postural control factors influencing the automatic (reflex-controlled) and attentional (high cortical) factors on dual task.

Methods: We used a dual task model to examine the attentional factors affecting the control of posture, subjecting test subjects to vibration stimulation, one-leg standing and verbal or nonverbal task trials. Twenty-three young, healthy participants were asked to stand on force plates and their centers of pressure were measured during dual task trials. We acquired 15 seconds of data for each volunteer during six dual task trials involving varying task combinations.

Results: We observed significantly different sway patterns between the early and late phases of dual task trials, which probably reflect the attentional demands. Vibration stimulation perturbed sway more during the early than the late phases; with or without vibration stimulation, the addition of secondary tasks decreased sway in all phases, and greater decreases in sway were observed in the late phases, when subjects were assigned nonverbal tasks. Less sway was observed during the nonverbal task in a sequential study.

Conclusion: The attentional and automatic factors were analyzed during a sequential study. By controlling the postural control factors, optimal parameters and training methods might be used in clinical applications.

No MeSH data available.


The amount of sway per second with secondary tasks during one-leg standing trials. COP, stands for the center of pressure distance; S, stands for one-leg standing as the primary task; Sv, stands for one-leg standing as the primary task and a verbal task as the secondary task; Snv, stands for one-leg standing as the primary task and a nonverbal task as the secondary task. *Denotes significant differences between Sv and Snv. †Denotes significant differences between viS and viSv.
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Figure 3: The amount of sway per second with secondary tasks during one-leg standing trials. COP, stands for the center of pressure distance; S, stands for one-leg standing as the primary task; Sv, stands for one-leg standing as the primary task and a verbal task as the secondary task; Snv, stands for one-leg standing as the primary task and a nonverbal task as the secondary task. *Denotes significant differences between Sv and Snv. †Denotes significant differences between viS and viSv.

Mentions: However, during trials in which participants are asked to maintain one-leg stands, greater postural control is needed as time goes by to maintain the balance, and eventually, the participants were forced to break posture. In our study, we observed that after 8-10 seconds, sway began to increase in such trials. In addition, when secondary tasks were given to standing participants, noticeable changes of sway were observed after 8-10 seconds (Fig. 2). Therefore, we split the trials into early and late phases with the distinction made when we observed the noticeable sway differences (Figs. 3, 4).


Sequential analysis of postural control resource allocation during a dual task test.

Hwang JH, Lee CH, Chang HJ, Park DS - Ann Rehabil Med (2013)

The amount of sway per second with secondary tasks during one-leg standing trials. COP, stands for the center of pressure distance; S, stands for one-leg standing as the primary task; Sv, stands for one-leg standing as the primary task and a verbal task as the secondary task; Snv, stands for one-leg standing as the primary task and a nonverbal task as the secondary task. *Denotes significant differences between Sv and Snv. †Denotes significant differences between viS and viSv.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3713291&req=5

Figure 3: The amount of sway per second with secondary tasks during one-leg standing trials. COP, stands for the center of pressure distance; S, stands for one-leg standing as the primary task; Sv, stands for one-leg standing as the primary task and a verbal task as the secondary task; Snv, stands for one-leg standing as the primary task and a nonverbal task as the secondary task. *Denotes significant differences between Sv and Snv. †Denotes significant differences between viS and viSv.
Mentions: However, during trials in which participants are asked to maintain one-leg stands, greater postural control is needed as time goes by to maintain the balance, and eventually, the participants were forced to break posture. In our study, we observed that after 8-10 seconds, sway began to increase in such trials. In addition, when secondary tasks were given to standing participants, noticeable changes of sway were observed after 8-10 seconds (Fig. 2). Therefore, we split the trials into early and late phases with the distinction made when we observed the noticeable sway differences (Figs. 3, 4).

Bottom Line: Less sway was observed during the nonverbal task in a sequential study.The attentional and automatic factors were analyzed during a sequential study.By controlling the postural control factors, optimal parameters and training methods might be used in clinical applications.

View Article: PubMed Central - PubMed

Affiliation: Department of Physical Medicine and Rehabilitation, Center for Clinical Research, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.

ABSTRACT

Objective: To investigate the postural control factors influencing the automatic (reflex-controlled) and attentional (high cortical) factors on dual task.

Methods: We used a dual task model to examine the attentional factors affecting the control of posture, subjecting test subjects to vibration stimulation, one-leg standing and verbal or nonverbal task trials. Twenty-three young, healthy participants were asked to stand on force plates and their centers of pressure were measured during dual task trials. We acquired 15 seconds of data for each volunteer during six dual task trials involving varying task combinations.

Results: We observed significantly different sway patterns between the early and late phases of dual task trials, which probably reflect the attentional demands. Vibration stimulation perturbed sway more during the early than the late phases; with or without vibration stimulation, the addition of secondary tasks decreased sway in all phases, and greater decreases in sway were observed in the late phases, when subjects were assigned nonverbal tasks. Less sway was observed during the nonverbal task in a sequential study.

Conclusion: The attentional and automatic factors were analyzed during a sequential study. By controlling the postural control factors, optimal parameters and training methods might be used in clinical applications.

No MeSH data available.