Neural control of the lips differs for young and older adults following a perturbation.
Neural control of the lips differs for young and older adults following a perturbation.
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DOI：
10.1007/s00221-010-2411-3
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发表时间：
2010-10
影响因子：
2
通讯作者：
Christou, Evangelos A.
中科院分区：
文献类型：
--
作者：
de Miranda Marzullo, Ana Carolina;Pinto Neto, Osmar;Ballard, Kirrie J.;Robin, Donald A.;Chaitow, Lauren;Christou, Evangelos A.
衰老损害了包括言语在内的许多熟练动作的控制。本文的目的是调查是否年轻人和老年人在言语过程中的下唇扰动适应不同。20名男性（10名年轻人，26 ± 3岁; 10名老年人，60 ± 9岁）被要求重复单词（“爸爸”）300次。在15%的试验中，受试者经历了下唇的机械扰动。位移和神经激活（EMG）的上唇和下唇进行了评价。与年轻人相比，下唇扰动导致老年人下唇最大位移增加更大（34.7 ± 19% vs. 13.4 ± 17%; P = 0.017）。此外，年轻人表现出更大的30-100赫兹标准化肌电图功率的下唇相比，上唇（P < 0.005）。在年轻人中，从正常到扰动试验在30-50 Hz频段的肌电图的变化呈负相关，从正常到扰动试验在下唇最大位移的变化（R2 = 0.48; P = 0.025）。它的结论是，年轻的成年人更好地适应下唇扰动与老年人相比，相关的神经激活策略的参与肌肉是不同的两个年龄组。
Aging impairs the control of many skilled movements including speech. The purpose of this paper was to investigate whether young and older adults adapt to lower lip perturbations during speech differently. Twenty men (10 young, 26 ± 3 years of age; 10 older, 60 ± 9 years of age) were requested to repeat the word (“papa”) 300 times. In 15% of the trials, the subjects experienced a mechanical perturbation on the lower lip. Displacement and neural activation (EMG) of the upper and lower lips were evaluated. Perturbations to the lower lip caused a greater increase in the maximum displacement of the lower lip for older adults compared with young adults (34.7 ± 19% vs. 13.4 ± 17%; P = 0.017). Furthermore, young adults exhibited significantly greater 30–100 Hz normalized EMG power for the lower lip compared to the upper lip (P < 0.005). In young adults, changes from normal to perturbed trials in the 30–50 Hz frequency band of the EMG were negatively correlated to the changes from normal to perturbed trials in the lower lip maximum displacement (R2 = 0.48; P = 0.025). It is concluded that young adults adapt better to lower lip perturbations compared with older adults and that the associated neural activation strategy of the involved muscle is different for the two age groups.
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