記述言語：日本語   出版者・発行元：(一社)日本老年歯科医学会  

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

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

PubMed

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掲載種別：研究論文（学術雑誌）   出版者・発行元：Wiley  

Background: Fatigue is an important factor for muscle strengthening in rehabilitation medicine. Frequency analysis has been regarded as the gold standard for muscle fatigue assessment in surface electromyography (EMG). However, there are no experiments quantifying fatigue with grouped discharge (GD), which is one of the historical phenomena observed in patients having fatigue, by using high sampling rate recording of EMG. Objective: To investigate the effect of fatigue, which is induced by repeated posterior tongue lift movement (TLM), on the occurrence of GD peaks, thus, to provide possible basis as a parameter for future fatigue evaluation. Methods: Nineteen healthy adults (9 men and 10 women) participated in this study. The muscle fatigue protocol consisted of repetitive posterior TLM and maximum voluntary contractions (MVC). Bilateral N-EMG (Neck surface EMG for measuring the muscle activity of the posterior tongue) was recorded. Results: Subjective tongue fatigue at the end of the protocol was significantly higher than at beginning throughout the muscle fatigue protocol (p <.01). The frequency of occurrence of GD peaks was 0.9 ± 1.2 (per second) at the baseline in 33 of 38 subject sides, and significantly increased depending on fatigue progression (p <.01). Conclusion: It was shown that fatigue due to repetitive posterior tongue lifting resulted in significant increase in the frequency of occurrence of GD peaks. Especially, the nature of GD, showing very few occurrences at non-fatigue condition, might work as an advantageous property for its use in future absolute evaluation of fatigue phenomena.

DOI： 10.1111/joor.13258

Scopus

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その他リンク： https://onlinelibrary.wiley.com/doi/full-xml/10.1111/joor.13258

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：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

PubMed

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：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

PubMed

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その他リンク： https://onlinelibrary.wiley.com/doi/full-xml/10.1111/joor.13135

記述言語：英語   掲載種別：研究論文（学術雑誌）  

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

PubMed

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：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

PubMed

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その他リンク： https://onlinelibrary.wiley.com/doi/full-xml/10.1111/joor.12774

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：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

PubMed

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：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

PubMed

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：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

PubMed

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：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

PubMed

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記述言語：日本語   出版者・発行元：(公社)日本補綴歯科学会  

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記述言語：日本語   出版者・発行元：(公社)日本補綴歯科学会  

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担当区分：筆頭著者  

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記述言語：日本語   出版者・発行元：日本顎口腔機能学会  

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記述言語：日本語   出版者・発行元：岡山歯学会  

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記述言語：日本語   出版者・発行元：(公社)日本補綴歯科学会  

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記述言語：日本語   出版者・発行元：(公社)日本補綴歯科学会  

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記述言語：日本語   出版者・発行元：(一社)日本老年歯科医学会  

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記述言語：日本語   出版者・発行元：日本顎口腔機能学会  

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記述言語：日本語   出版者・発行元：日本顎口腔機能学会  

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J-GLOBAL

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J-GLOBAL

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J-GLOBAL

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記述言語：日本語   出版者・発行元：(公社)日本補綴歯科学会  

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記述言語：日本語   出版者・発行元：日本顎口腔機能学会  

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その他リンク： https://search.jamas.or.jp/index.php?module=Default&action=Link&pub_year=2020&ichushi_jid=J02994&link_issn=&doc_id=20210517470016&doc_link_id=10.7144%2Fsgf.26.122&url=https%3A%2F%2Fdoi.org%2F10.7144%2Fsgf.26.122&type=J-STAGE&icon=https%3A%2F%2Fjk04.jamas.or.jp%2Ficon%2F00007_3.gif

記述言語：日本語   出版者・発行元：岡山歯学会  

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記述言語：日本語   出版者・発行元：日本顎口腔機能学会  

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その他リンク： https://search.jamas.or.jp/index.php?module=Default&action=Link&pub_year=2019&ichushi_jid=J02994&link_issn=&doc_id=20200624230011&doc_link_id=10.7144%2Fsgf.25.120&url=https%3A%2F%2Fdoi.org%2F10.7144%2Fsgf.25.120&type=J-STAGE&icon=https%3A%2F%2Fjk04.jamas.or.jp%2Ficon%2F00007_3.gif

記述言語：日本語   出版者・発行元：(一社)日本老年歯科医学会  

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記述言語：日本語   出版者・発行元：(一社)日本老年歯科医学会  

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記述言語：日本語   出版者・発行元：医歯薬出版(株)  

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記述言語：日本語   出版者・発行元：(公社)日本補綴歯科学会  

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記述言語：日本語   出版者・発行元：(公社)日本補綴歯科学会  

J-GLOBAL

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記述言語：日本語   出版者・発行元：(公社)日本補綴歯科学会  

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記述言語：日本語   出版者・発行元：日本顎口腔機能学会  

DOI： 10.7144/sgf.22.30

CiNii Article

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その他リンク： http://search.jamas.or.jp/link/ui/2016221961

記述言語：日本語   出版者・発行元：岡山歯学会  

J-GLOBAL

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記述言語：日本語   出版者・発行元：(一社)日本摂食嚥下リハビリテーション学会  

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記述言語：日本語   出版者・発行元：(公社)日本補綴歯科学会  

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記述言語：日本語   出版者・発行元：(一社)日本摂食嚥下リハビリテーション学会  

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記述言語：日本語   出版者・発行元：岡山歯学会  

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記述言語：日本語   出版者・発行元：(一社)日本摂食嚥下リハビリテーション学会  

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開催年月日： 2021年8月20日 - 2021年8月22日

開催年月日： 2021年8月19日 - 2021年8月22日

記述言語：日本語  

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開催年月日： 2021年6月26日 - 2021年6月27日

記述言語：日本語  

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開催年月日： 2021年6月26日 - 2021年6月27日

開催年月日： 2021年6月11日 - 2021年6月13日

記述言語：日本語  

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開催年月日： 2020年6月27日 - 2020年6月28日

記述言語：日本語   会議種別：ポスター発表  

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開催年月日： 2019年12月15日

記述言語：日本語   会議種別：口頭発表（一般）  

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開催年月日： 2019年10月28日

記述言語：日本語   会議種別：口頭発表（一般）  

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開催年月日： 2018年9月29日 - 2018年9月30日

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：東京  

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開催年月日： 2017年6月14日 - 2017年6月16日

記述言語：日本語   会議種別：口頭発表（一般）  

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開催年月日： 2016年9月3日 - 2016年9月4日

記述言語：日本語   会議種別：ポスター発表  

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開催年月日： 2015年9月5日 - 2015年9月6日

記述言語：日本語   会議種別：ポスター発表  

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開催年月日： 2015年9月5日 - 2015年9月6日

記述言語：日本語   会議種別：ポスター発表  

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開催年月日： 2015年5月30日 - 2015年5月31日

記述言語：日本語   会議種別：ポスター発表  

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開催年月日： 2015年5月30日 - 2015年5月31日

記述言語：日本語   会議種別：ポスター発表  

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開催年月日： 2015年4月18日 - 2015年4月19日

記述言語：日本語   会議種別：口頭発表（一般）  

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開催年月日： 2014年10月26日

記述言語：日本語   会議種別：口頭発表（一般）  

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開催年月日： 2014年9月6日 - 2014年9月7日

記述言語：日本語   会議種別：ポスター発表  

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開催年月日： 2014年9月

記述言語：日本語   会議種別：口頭発表（一般）  

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開催年月日： 2014年5月24日 - 2014年5月25日

記述言語：日本語   会議種別：口頭発表（一般）  

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開催年月日： 2013年10月27日

記述言語：日本語   会議種別：口頭発表（一般）  

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開催年月日： 2013年9月22日 - 2013年9月23日

記述言語：日本語   会議種別：口頭発表（一般）  

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