Department of Speech, Language, and Hearing Sciences, Niigata University of Health and Welfare, Niigata city, Niigata, Japan.
Major in Health and Welfare, Niigata University of Health and Welfare Graduate School, Niigata city, Niigata, Japan.
PLoS One. 2022 Mar 8;17(3):e0264995. doi: 10.1371/journal.pone.0264995. eCollection 2022.
The effects of muscle weakness on speech are currently not fully known. We investigated the relationships between maximum tongue pressure and second formant transition in adults with different types of dysarthria. It focused on the slope in the second formant transition because it reflects the tongue velocity during articulation. Sixty-three Japanese speakers with dysarthria (median age, 68 years; interquartile range, 58-77 years; 44 men and 19 women) admitted to acute and convalescent hospitals were included. Thirty neurologically normal speakers aged 19-85 years (median age, 22 years; interquartile range, 21.0-23.8 years; 14 men and 16 women) were also included. The relationship between the maximum tongue pressure and speech function was evaluated using correlation analysis in the dysarthria group. Speech intelligibility, the oral diadochokinesis rate, and the second formant slope were based on the impaired speech index. More than half of the speakers had mild to moderate dysarthria. Speakers with dysarthria showed significantly lower maximum tongue pressure, speech intelligibility, oral diadochokinesis rate, and second formant slope than neurologically normal speakers. Only the second formant slope was significantly correlated with the maximum tongue pressure (r = 0.368, p = 0.003). The relationship between the second formant slope and maximum tongue pressure showed a similar correlation in the analysis of subgroups divided by sex. The oral diadochokinesis rate, which is related to the speed of articulation, is affected by voice on/off, mandibular opening/closing, and range of motion. In contrast, the second formant slope was less affected by these factors. These results suggest that the maximum isometric tongue strength is associated with tongue movement speed during articulation.
肌肉无力对言语的影响目前尚未完全清楚。我们研究了不同类型构音障碍成人的最大舌压与第二共振峰转换之间的关系。我们关注第二共振峰转换的斜率，因为它反映了发音过程中的舌运动速度。纳入了 63 名患有构音障碍的日本成年人（中位年龄 68 岁，四分位间距 58-77 岁；44 名男性和 19 名女性），这些患者分别来自急性和康复医院。还纳入了 30 名年龄为 19-85 岁（中位年龄 22 岁，四分位间距 21.0-23.8 岁；14 名男性和 16 名女性）的神经正常的说话者。在构音障碍组中，使用相关分析评估最大舌压与言语功能之间的关系。根据受损言语指数评估言语清晰度、口腔交替运动率和第二共振峰斜率。超过一半的患者有轻度至中度构音障碍。与神经正常的说话者相比，构音障碍患者的最大舌压、言语清晰度、口腔交替运动率和第二共振峰斜率显著降低。只有第二共振峰斜率与最大舌压显著相关（r=0.368，p=0.003）。按性别分组进行分析，第二共振峰斜率与最大舌压之间的关系呈相似的相关性。与发音速度相关的口腔交替运动率受发音起止、下颌开合和运动范围的影响。相比之下，第二共振峰斜率受这些因素的影响较小。这些结果表明，最大等长舌力与发音过程中的舌运动速度有关。
