Stride-to-stride variability while backward counting among healthy young adults.
Stride-to-stride variability while backward counting among healthy young adults.
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DOI：
10.1186/1743-0003-2-26
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发表时间：
2005-08-11
影响因子：
5.1
通讯作者：
Kressig, Reto W
中科院分区：
文献类型：
--
作者：
Beauchet, Olivier;Dubost, Veronique;Kressig, Reto W
背景：关于注意力参与步态节律控制的信息很少。步幅时间和步幅长度的变化与节奏性迈步机制的控制密切相关。我们试图 1) 确定健康年轻人步行时倒数是否会引起步速、步幅时间和步长的平均值和变异系数的显着变化； 2) 确定步幅变异性的变化是否与双任务相关的步幅速度变化、注意力或两者有关。 方法：使用 Physilog 系统记录 49 名健康年轻人（平均年龄 24.1 +/- 2.8 岁，女性 49%）在单独行走和同时倒数行走时以自行选择的步行速度记录步幅速度、步幅时间和步幅长度的平均值和变异系数。通过记录独坐和行走时计数的数字来评估倒数计数的表现。 结果：与单独行走相比，双任务相关的步幅速度平均值显着下降（p < 0.001），同时步幅时间平均值和变异系数小幅但显着增加（分别为 p < 0.001 和 p = 0.015）。两种步行条件下的步幅参数没有显着变化。与双任务相关的步幅时间变异系数的增加是通过改变受试者之间的步幅速度和变异性来解释的，而不是通过向后计数来解释。与单独向后计数相比，边走边计数的数字数量显着减少。此外，与双任务相关的计数数字的减少显着高于与双任务相关的步幅速度的减少（p = 0.013）。结论：在双任务处理时观察到的步态和倒数性能变化证实了步行的某些方面对年轻人来说是需要注意力的。在由 49 名年轻志愿者组成的测试组中，双重任务导致步速小幅下降，步幅时间的步幅变异性略有增加，而步速变异性并未受到需要注意力的任务的影响。步幅时间变异性的增加显然是步态速度变化的结果，而不是双重任务的结果。这表明年轻人在行走时只需要很少的注意力来控制有节奏的迈步机制。
BACKGROUND: Little information exists about the involvement of attention in the control of gait rhythmicity. Variability of both stride time and stride length is closely related to the control of the rhythmic stepping mechanism. We sought 1) to determine whether backward counting while walking could provoke significant gait changes in mean values and coefficients of variation of stride velocity, stride time and stride length among healthy young adults; and 2) to establish whether change in stride-to-stride variability could be related to dual-task related stride velocity change, attention, or both.METHODS: Mean values and coefficients of variation of stride velocity, stride time and stride length were recorded using the Physilog-system, at a self-selected walking speed in 49 healthy young adults (mean age 24.1 +/- 2.8 years, women 49%) while walking alone and walking with simultaneous backward counting. Performance on backward counting was evaluated by recording the number of figures counted while sitting alone and while walking.RESULTS: Compared with walking alone, a significant dual-task-related decrease was found for the mean values of stride velocity (p < 0.001), along with a small but significant increase for the mean values and coefficients of variation of stride time (p < 0.001 and p = 0.015, respectively). Stride length parameters did not change significantly between both walking conditions. Dual-task-related increase of coefficient of variation of stride time was explained by changing stride velocity and variability between subjects but not by backward counting. The number of figures counted while walking decreased significantly compared to backward counting alone. Further, the dual-task related decrease of the number of enumerated figures was significantly higher than the dual-task related decrease of stride velocity (p = 0.013).CONCLUSION: The observed performance-changes in gait and backward counting while dual tasking confirm that certain aspects of walking are attention-demanding in young adults. In the tested group of 49 young volunteers, dual tasking caused a small decrease in stride velocity and a slight increase in the stride-to-stride variability of stride time, while stride velocity variability was not affected by the attention-demanding task. The increase in stride time variability was apparently the result of a change in gait speed, but not a result of dual tasking. This suggests that young adults require minimal attention for the control of the rhythmic stepping mechanism while walking.