Faculty Profiles - MANDA Yousuke

Papers - MANDA Yousuke

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Basic characteristics of tongue pressure and electromyography generated by articulation of a syllable using the posterior part of the tongue Reviewed

Yousuke Manda, Naoki Kodama, Keitaro Mori, Reimi Adachi, Makoto Matsugishi, Shogo Minagi

Scientific Reports 14 ( 1 ) 2024.9

上下無歯顎者におけるニュートラルゾーンの記録法と形態の違いに関するデジタル評価

松岸諒, 愛甲文音, 兒玉直紀, 庄賀春生, 丸尾幸憲, 萬田陽介, 田中祐貴, 杉本皓, 角谷実穂[桑原], 森慧太朗, 北川佳祐, 加藤知香[市川], 原哲也

日本補綴歯科学会誌 16 ( 特別号 ) 183 - 183 2024.7

Cultivate “Initiative” and “Imagination” through Stomatognathic Function Research! Invited

Yousuke Manda

The Journal of Japanese Society of Stomatognathic Function 30 ( 2 ) 106 - 108 2024

日常生活中の筋電図記録に混入し得るノイズ信号に関する研究

皆木省吾, 兒玉直紀, 中原龍一, 尾崎敏文, 古寺寛志, 北川佳祐, 萬田陽介, 田中祐貴, 杉本皓, 森慧太朗, 山田蘭子, 松岸諒, 桑原実穂

日本顎口腔機能学会雑誌 29 ( 2 ) 124 - 125 2023.3

コロナ禍における老人介護施設での口腔栄養関連サービスに関するPBL演習

前田あずさ, 縄稚久美子, 菊谷武, 兒玉直紀, 萬田陽介, 窪木拓男

岡山歯学会雑誌 41 ( 2 ) 21 - 33 2022.12

認知行動療法は覚醒時ブラキシズムを抑制できるか?

三谷裕子, 兒玉直紀, 加藤聖也, 北川佳祐, 萬田陽介, 古寺寛志, 森慧太朗, 長塚弘亮, 川上滋央, 足立れいみ, 市川知香, 松岸諒, 山田蘭子, 桑原実穂, 杉本皓, 皆木省吾

日本補綴歯科学会誌 14 ( 東北・北海道支部学術大会特別号 ) 32 - 32 2022.10

老人介護施設における要介護高齢者や介護職員と歯学部生を電子的に繋いだPBL演習の取組

縄稚久美子, 前田あずさ, 兒玉直紀, 萬田陽介, 菊谷武, 窪木拓男

老年歯科医学 37 ( 2 ) 162 - 162 2022.9

Efficacy of soft palatal augmentation prosthesis for oral functional rehabilitation in patients with dysarthria and dysphagia: a protocol for a randomised controlled trial. International journal

Tomonori Yokoyama, Takao Mukai, Naoki Kodama, Kana Takao, Takashi Hiraoka, Nobuyuki Arai, Jitsuro Yano, Hiroaki Nagatsuka, Yousuke Manda, Kozo Hanayama, Shogo Minagi

BMJ open 12 ( 7 ) e060040 2022.7

Language：English Publishing type：Research paper (scientific journal)

INTRODUCTION: Palatal augmentation prosthesis (PAP) is used in patients with articulation and swallowing disorders caused by postoperative loss of tongue tissue due to tongue cancer, cerebrovascular disease sequelae and age-related hypofunction. We have previously reported a newly designed soft PAP fabricated using an thermoplastic material that is particularly appropriate for early intervention. However, the effect of soft PAP on oral function improvement remains to be elucidated. The aim of this study is to investigate whether soft PAP can improve dysarthria and dysphagia occurring as cerebrovascular disease sequelae. METHODS AND ANALYSIS: This prospective, randomised, controlled trial will compare the immediate and training effects of rehabilitation using soft PAP with those of rehabilitation without using it. Primary outcomes are the single-word intelligibility test score and pharyngeal transit time (PTT). Secondary outcomes are tongue function (evaluated based on maximum tongue pressure, repetitions of tongue pressure and endurance of tongue pressure), articulation function (evaluated based on speech intelligibility, oral diadochokinesis, Voice-Related Quality of Life (V-RQOL)) and swallowing function (evaluated using Eating Assessment Tool-10). The study results will help determine the efficacy of Soft PAP in improving functional outcomes of word intelligibility and PTT. We hypothesised that early rehabilitation using Soft PAP would more effectively improve articulation and swallowing function compared with conventional rehabilitation without using soft PAP. ETHICS AND DISSEMINATION: Ethical approval was obtained from the Okayama University Certified Review Board. The study findings will be published in an open access, peer-reviewed journal and presented at relevant conferences and research meetings. TRIAL REGISTRATION NUMBER: jRCTs062200054.

DOI： 10.1136/bmjopen-2021-060040

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Detection of muscle fatigue caused by repeated posterior tongue lift movement from neck surface EMG: a pilot study

Hiroshi Furutera, Shigehisa Kawakami, Naoki Kodama, Yosuke Manda, Keisuke Kitagawa, Ryuichi Nakahara, Shogo Minagi

Journal of Oral Rehabilitation 48 ( 12 ) 1337 - 1346 2021.12

Effect of masseter muscle activity during wakefulness and sleep on tooth wear

Keisuke Kitagawa, Naoki Kodama, Yousuke Manda, Keitaro Mori, Hiroshi Furutera, Shogo Minagi

Journal of Prosthodontic Research 66 ( 4 ) 551 - 556 2021.12

Language：English Publishing type：Research paper (scientific journal) Publisher：Japan Prosthodontic Society

PURPOSE: To investigate the effect of masseter muscle activity during wakefulness and sleep on tooth wear. METHODS: Sixteen participants with no or mild tooth wear (NMTW group) and sixteen participants with moderate-to-severe tooth wear (MSTW group) were enrolled. The severity of tooth wear was evaluated using the occlusal and incisal indices of the tooth wear index. Surface electromyography was performed to record the electrical activity of the left masseter muscle during wakefulness and sleep. Electromyographic activity was detected using an electromyographic threshold of 5% and 20% of maximal voluntary clenching (MVC). The total duration of electromyographic activity and bruxism episodes were calculated. RESULTS: The mean ages of the NMTW and MSTW groups were 71.75 ± 7.61 years and 71.69 ± 7.49 years, respectively. The mean cumulative duration of electromyographic activity during wakefulness using a threshold of >5% MVC was 6.44 ± 4.52 min/h and 13.62 ± 10.08 min/h for the NMTW and MSTW groups, respectively (p=0.048). The mean total durations of electromyographic activity during wakefulness and sleep using a threshold of >20% MVC were 1.08 ± 1.70 min/h and 1.05 ± 3.02 min/h, respectively, in the NMTW group and 4.78 ± 6.37 min/h and 1.61 ± 1.79 min/h, respectively, in the MSTW group (p=0.048 and p=0.003, respectively). CONCLUSION: These results suggest that masseter electromyographic activity during wakefulness and sleep may be related to the severity of tooth wear.

DOI： 10.2186/jpr.jpr_d_21_00171

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Coordination of surface electromyography activity in the posterior tongue region during mastication of differently textured foods International journal

Keitaro Mori, Yousuke Manda, Keisuke Kitagawa, Hiroaki Nagatsuka, Hiroshi Furutera, Naoki Kodama, Shogo Minagi

Journal of Oral Rehabilitation 48 ( 4 ) 403 - 410 2021.4

Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

BACKGROUND: Masticatory movement occurs complicatedly and bilaterally. Although the tongue plays an important role in mastication, bilateral tongue function during mastication has not been clarified yet. OBJECTIVE: To investigate the effect of food properties on posterior tongue activity and coordination of muscles bilaterally by electromyography (EMG). METHODS: Twenty healthy adults (10 males and 10 females; mean age 28 years; range: 22-33 years) participated in this study. Three test foods, gummy jelly (hard food), sponge cake (soft food requiring crushing), and mashed potatoes (soft food not requiring crushing), were used. Bilateral masseter N-EMG (surface electromyography for measuring the muscle activity of posterior tongue) and submental EMG were carried out while the participants chewed three test foods. The participants were instructed to masticate three test foods only on the right side and only on the left side unilaterally. RESULTS: In the case of gummy jelly, N-EMG activity on the mastication side was significantly larger than that on the non-mastication side (P < .01). Regarding temporal relationship between the masseter and N-EMG activity, in the case of gummy jelly, the percentage of cases where the N-EMG peak was observed during masseter muscle EMG bursts was significantly higher than those for sponge cake and mashed potatoes (P < .01). CONCLUSION: N-EMG activity on the mastication side was significantly larger than that on the non-mastication side in the mastication of hard foods. Tongue showed activity pattern changes and coordinated with the masseter muscle depending on food texture.

DOI： 10.1111/joor.13135

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Other Link： https://onlinelibrary.wiley.com/doi/full-xml/10.1111/joor.13135

Characteristics of Grouped Discharge Waveforms Observed in Long-term Masseter Muscle Electromyographic Recording: A Preliminary Study.

Naoto Maeda, Naoki Kodama, Yosuke Manda, Shigehisa Kawakami, Kazuhiro Oki, Shogo Minagi

Acta medica Okayama 73 ( 4 ) 357 - 360 2019.8

Language：English Publishing type：Research paper (scientific journal)

We investigated the characteristics of grouped discharge (GD) waveforms obtained from long-term masseter electromyogram (EMG) recording in 6 female temporomandibular disorder (TMD) patients with myofascial pain and 6 healthy females. The EMG measurement was performed from the morning of the experiment day until the subject woke up the next day. We observed a significantly larger number of GD waveforms in the TMD group compared to the control group (p=0.002). Our results indicate that the existence of GD waveforms in masseter EMGs might be a predictor of future TMD with myofascial pain.

DOI： 10.18926/AMO/56938

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Effect of food properties and chewing condition on the electromyographic activity of the posterior tongue International journal

Yousuke Manda, Naoki Kodama, Naoto Maeda, Shogo Minagi

Journal of Oral Rehabilitation 46 ( 6 ) 511 - 517 2019.6

Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

BACKGROUND: Retraction of the posterior tongue facilitates bolus formation, food transfer and Stage II transport in chewing and swallowing. Surface electromyography of the neck region (N-EMG) enabled the evaluation of muscle function at the posterior tongue. Although previous studies showed that food hardness increased masticatory muscles EMG activity and volitional chewing altered swallowing, the effect of food properties and chewing condition on N-EMG activity has not yet been elucidated. OBJECTIVE: To investigate the effect of food properties and chewing conditions on N-EMG. METHODS: Twelve healthy adults (six men and six women, mean age 28.1 ± 2.7) participated in this study. Three test foods were used: a cookie (solid food), crushed cookies adjusted using agar and water (semisolid food) and crushed cookies adjusted using thickening agent and water (soft food). Masseter and submental muscle EMG and N-EMG activity were recorded while chewing the three test foods. Participants were instructed to masticate the three test foods in three chewing conditions: (a) chewing freely, (b) chewing test foods with the same number of chewing cycles as when chewing solid food and (c) chewing with a maximum effort. RESULTS: Total N-EMG activity when chewing solid food was higher than that in the other two test foods regardless of the chewing condition. In soft food and semisolid food, the total N-EMG activity was increased by increasing the number of chewing cycles. CONCLUSION: The total N-EMG activity was increased while chewing hard food, which indicates the positive effect of chewing hard food on rehabilitation at the posterior tongue.

DOI： 10.1111/joor.12774

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Other Link： https://onlinelibrary.wiley.com/doi/full-xml/10.1111/joor.12774

Validation of the optimal site in the neck region for detecting swallowing sounds International journal

Q. Pan, N. Maeda, Y. Manda, N. Kodama, S. Minagi

Journal of Oral Rehabilitation 43 ( 11 ) 840 - 846 2016.11

Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

Recently, the swallowing sound has been used to detect swallowing events non-invasively. A previous study, using an accelerometer, showed that the site over the lateral border of the trachea immediately inferior to the cricoid cartilage was the optimal site for detecting swallowing sounds. However, the optimal site for detection of the swallowing sound using a microphone remains undetermined. To validate the optimal site in the neck region for detecting swallowing sounds. Fourteen healthy subjects (mean age, 27·6 ± 2·2 years; seven male and seven female) participated in this study. Twenty condenser microphones were attached to 20 sites on the left neck surface to detect swallowing sounds. Participants were instructed to swallow five different stimuli three times as follows: Resting saliva, 1 and 5 mL of Japanese tea, and 1 and 5 mL of yoghurt. Mean relative peak intensity was used to indicate the magnitude of the swallowing sound. Sound spectrograms were used to illustrate differences in the properties of swallowing sounds. Mean relative peak intensity number was highest in sites at the inferior border of the mandible just above the sternocleidomastoid muscle (site 11) and sites over the lateral border of the trachea immediately inferior to the cricoid cartilage (site 8). Comparison of spectrograms showed a greater density distribution of higher frequency components at site 11 compared with site 8. These results indicate that the inferior border of the mandible just above the sternocleidomastoid muscle is the optimal site for the detection of swallowing sounds.

DOI： 10.1111/joor.12440

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New method of neck surface electromyography for the evaluation of tongue-lifting activity International journal

Y. Manda, N. Maeda, Q. Pan, K. Sugimoto, Y. Hashimoto, Y. Tanaka, N. Kodama, S. Minagi

Journal of Oral Rehabilitation 43 ( 6 ) 417 - 425 2016.6

Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

Elevation of the posterior part of the tongue is important for normal deglutition and speech. The purpose of this study was to develop a new surface electromyography (EMG) method to non-invasively and objectively evaluate activity in the muscles that control lifting movement in the posterior tongue. Neck surface EMG (N-EMG) was recorded using differential surface electrodes placed on the neck, 1 cm posterior to the posterior border of the mylohyoid muscle on a line orthogonal to the lower border of the mandible. Experiment 1: Three healthy volunteers (three men, mean age 37·7 years) participated in an evaluation of detection method of the posterior tongue lifting up movement. EMG recordings from the masseter, temporalis and submental muscles and N-EMG revealed that i) N-EMG was not affected by masseter muscle EMG and ii) N-EMG activity was not observed during simple jaw opening and tongue protrusion, revealing the functional difference between submental surface EMG and N-EMG. Experiment 2: Seven healthy volunteers (six men and one woman, mean age 27·9 years) participated in a quantitative evaluation of muscle activity. Tongue-lifting tasks were perfor-med, exerting a prescribed force of 20, 50, 100 and 150 gf with visual feedback. For all subjects, a significant linear relationship was observed bet-ween the tongue-lifting force and N-EMG activity (P < 0·01). These findings indicate that N-EMG can be used to quantify the force of posterior tongue lifting and could be useful to evaluate the effect of tongue rehabilitation in future studies.

DOI： 10.1111/joor.12389

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A novel automated detection system for swallowing sounds during eating and speech under everyday conditions International journal

C. Fukuike, N. Kodama, Y. Manda, Y. Hashimoto, K. Sugimoto, A. Hirata, Q. Pan, N. Maeda, S. Minagi

Journal of Oral Rehabilitation 42 ( 5 ) 340 - 347 2015.5

Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

The wave analysis of swallowing sounds has been receiving attention because the recording process is easy and non-invasive. However, up until now, an expert has been needed to visually examine the entire recorded wave to distinguish swallowing from other sounds. The purpose of this study was to establish a methodology to automatically distinguish the sound of swallowing from sound data recorded during a meal in the presence of everyday ambient sound. Seven healthy participants (mean age: 26·7 ± 1·3 years) participated in this study. A laryngeal microphone and a condenser microphone attached to the nostril were used for simultaneous recording. Recoding took place while participants were taking a meal and talking with a conversational partner. Participants were instructed to step on a foot pedal trigger switch when they swallowed, representing self-enumeration of swallowing, and also to achieve six additional noise-making tasks during the meal in a randomised manner. The automated analysis system correctly detected 342 out of the 352 self-enumerated swallowing events (sensitivity: 97·2%) and 479 out of the 503 semblable wave periods of swallowing (specificity: 95·2%). In this study, the automated detection system for swallowing sounds using a nostril microphone was able to detect the swallowing event with high sensitivity and specificity even under the conditions of daily life, thus showing potential utility in the diagnosis or screening of dysphagic patients in future studies.

DOI： 10.1111/joor.12264

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Specific Diurnal EMG Activity Pattern Observed in Occlusal Collapse Patients: Relationship between Diurnal Bruxism and Tooth Loss Progression International journal

Shigehisa Kawakami, Yohei Kumazaki, Yosuke Manda, Kazuhiro Oki, Shogo Minagi

PLoS ONE 9 ( 7 ) e101882 - e101882 2014.7

Language：English Publishing type：Research paper (scientific journal) Publisher：Public Library of Science (PLoS)

AIM: The role of parafunctional masticatory muscle activity in tooth loss has not been fully clarified. This study aimed to reveal the characteristic activity of masseter muscles in bite collapse patients while awake and asleep. MATERIALS AND METHODS: Six progressive bite collapse patients (PBC group), six age- and gender-matched control subjects (MC group), and six young control subjects (YC group) were enrolled. Electromyograms (EMG) of the masseter muscles were continuously recorded with an ambulatory EMG recorder while patients were awake and asleep. Diurnal and nocturnal parafunctional EMG activity was classified as phasic, tonic, or mixed using an EMG threshold of 20% maximal voluntary clenching. RESULTS: Highly extended diurnal phasic activity was observed only in the PBC group. The three groups had significantly different mean diurnal phasic episodes per hour, with 13.29±7.18 per hour in the PBC group, 0.95±0.97 per hour in the MC group, and 0.87±0.98 per hour in the YC group (p<0.01). ROC curve analysis suggested that the number of diurnal phasic episodes might be used to predict bite collapsing tooth loss. CONCLUSION: Extensive bite loss might be related to diurnal masticatory muscle parafunction but not to parafunction during sleep. CLINICAL RELEVANCE SCIENTIFIC RATIONALE FOR STUDY: Although mandibular parafunction has been implicated in stomatognathic system breakdown, a causal relationship has not been established because scientific modalities to evaluate parafunctional activity have been lacking. PRINCIPAL FINDINGS: This study used a newly developed EMG recording system that evaluates masseter muscle activity throughout the day. Our results challenge the stereotypical idea of nocturnal bruxism as a strong destructive force. We found that diurnal phasic masticatory muscle activity was most characteristic in patients with progressive bite collapse. PRACTICAL IMPLICATIONS: The incidence of diurnal phasic contractions could be used for the prognostic evaluation of stomatognathic system stability.

DOI： 10.1371/journal.pone.0101882

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