{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,25]],"date-time":"2026-04-25T13:07:27Z","timestamp":1777122447238,"version":"3.51.4"},"reference-count":30,"publisher":"MDPI AG","issue":"6","license":[{"start":{"date-parts":[[2024,11,14]],"date-time":"2024-11-14T00:00:00Z","timestamp":1731542400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Clinics and Practice"],"abstract":"<jats:p>Background\/Objectives: Health management in workers in the taxi industry is particularly challenging due to irregular working hours and the need to prevent fatal accidents. In addition, drivers in Japan are aging, and the early prevention of age-related deterioration in oral health is an increasingly important issue. The aim of this cross-sectional study was to investigate the relationships between oral diadochokinesis (OD), tongue pressure, and lip-seal strength in Japanese male taxi workers. Methods: Measurements of tongue pressure and lip-seal strength were performed by dentists using specialized equipment. OD was measured using the number of consecutive \u201cPa\u201d, \u201cTa\u201d, and \u201cKa\u201d vocalizations that could be produced in 5 s. We performed multiple regression analysis to examine the effects of lip-seal strength and tongue pressure on OD. Results: The study included 437 participants, excluding 17 who could not complete all oral cavity measurements. Tongue pressure showed a significant positive correlation with \u201cPa\u201d, \u201cTa\u201d, and \u201cKa\u201d (correlation coefficients: 0.527\u20130.680). Lip-seal strength was not significantly correlated with OD. Tongue pressure showed a significant positive correlation with \u201cPa\u201d, \u201cTa\u201d, and \u201cKa\u201d. In the results of multiple regression analyses without the elderly participants, tongue pressure was associated with \u201cPa\u201d (\u03b2[95% confidence interval]: 0.574[0.304, 0.843]), \u201cTa\u201d (0.436[0.231, 0.640]), and \u201cKa\u201d (0.424[0.210, 0.639]), and lip-seal strength was associated with \u201cPa\u201d (0.128[0.032, 0.224]) and \u201cKa\u201d (0.083[0.006, 0.160]). Conclusions: OD may be associated with lip-seal strength and tongue pressure even without including elderly workers. Regardless of age, maintaining good OD may help maintain lip-seal strength and tongue pressure, which may play a role in reducing the risk of age-related oral disorders.<\/jats:p>","DOI":"10.3390\/clinpract14060196","type":"journal-article","created":{"date-parts":[[2024,11,14]],"date-time":"2024-11-14T09:14:31Z","timestamp":1731575671000},"page":"2499-2506","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Oral Diadochokinesis, Tongue Pressure, and Lip-Seal Strength Among Japanese Male Workers in the Taxi Industry: A Cross-Sectional Study"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9805-508X","authenticated-orcid":false,"given":"Akira","family":"Minoura","sequence":"first","affiliation":[{"name":"Department of Hygiene, Public Health and Preventive Medicine, School of Medicine, Showa University, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142-8555, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yoshiaki","family":"Ihara","sequence":"additional","affiliation":[{"name":"Division of Oral Functional Rehabilitation Medicine, Department of Special Needs Dentistry, School of Dentistry, Showa University, 2-1-1 Kitasenzoku, Ohta-ku, Tokyo 145-8515, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hirotaka","family":"Kato","sequence":"additional","affiliation":[{"name":"Division of Oral Functional Rehabilitation Medicine, Department of Special Needs Dentistry, School of Dentistry, Showa University, 2-1-1 Kitasenzoku, Ohta-ku, Tokyo 145-8515, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kouzou","family":"Murakami","sequence":"additional","affiliation":[{"name":"Department of Radiology, Division of Radiation Oncology, School of Medicine, Showa University, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142-8555, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yoshio","family":"Watanabe","sequence":"additional","affiliation":[{"name":"Division of Respiratory Medicine and Allergology, Department of Medicine, School of Medicine, Showa University, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142-8555, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kojiro","family":"Hirano","sequence":"additional","affiliation":[{"name":"Department of Otorhinolaryngology Head and Neck Surgery, School of Medicine, Showa University, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142-8555, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yoshinori","family":"Ito","sequence":"additional","affiliation":[{"name":"Department of Radiology, Division of Radiation Oncology, School of Medicine, Showa University, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142-8555, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2252-3542","authenticated-orcid":false,"given":"Akatsuki","family":"Kokaze","sequence":"additional","affiliation":[{"name":"Department of Hygiene, Public Health and Preventive Medicine, School of Medicine, Showa University, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142-8555, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2024,11,14]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"328","DOI":"10.1111\/joor.13594","article-title":"Can oral diadochokinesis be used as an assessment tool of oral function in older adults requiring care in nursing home?","volume":"51","author":"Konishi","year":"2023","journal-title":"J. Oral Rehabil."},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Ong, Y.Q., Lee, J., Chu, S.Y., Chai, S.C., Gan, K.B., Ibrahim, N.M., and Barlow, S.M. (2024). Oral-diadochokinesis between Parkinson\u2019s disease and neurotypical elderly among Malaysian-Malay speakers. Int. J. Lang. Commun. Disord., online ahead of print.","DOI":"10.1111\/1460-6984.13025"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1159\/000319728","article-title":"Oral and vocal fold diadochokinesis in children","volume":"63","author":"Modolo","year":"2011","journal-title":"Folia Phoniatr. Logop."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"1783","DOI":"10.1111\/1460-6984.12908","article-title":"Oral diadochokinetic production in children with typical speech development and speech-sound disorders","volume":"58","author":"Ha","year":"2023","journal-title":"Int. J. Lang. Commun. Disord."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"985","DOI":"10.1002\/mds.21996","article-title":"Speech rate and rhythm in Parkinson\u2019s disease","volume":"23","author":"Skodda","year":"2008","journal-title":"Mov. Disord. Off. J. Mov. Disord. Soc."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"1207","DOI":"10.2147\/CIA.S141148","article-title":"Relationship between tongue strength, lip strength, and nutrition-related sarcopenia in older rehabilitation inpatients: A cross-sectional study","volume":"12","author":"Sakai","year":"2017","journal-title":"Clin. Interv. Aging"},{"key":"ref_7","doi-asserted-by":"crossref","unstructured":"Minoura, A., Ihara, Y., Kato, H., Murakami, K., Watanabe, Y., Hirano, K., Ito, Y., and Kokaze, A. (2023). Lip Seal Strength and Tongue Pressure among Japanese Male Workers: Comparison of Different Age Groups. Int. J. Environ. Res. Public Health, 20.","DOI":"10.3390\/ijerph20042862"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"1122","DOI":"10.1002\/cre2.440","article-title":"Distribution of lip-seal strength and its relation to oral motor functions","volume":"7","author":"Kugimiya","year":"2021","journal-title":"Clin. Exp. Dent. Res."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"15","DOI":"10.1159\/000266338","article-title":"Oral diadochokinesis in neurological dysarthrias","volume":"47","author":"Ackermann","year":"1995","journal-title":"Folia Phoniatr. Logop."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"33","DOI":"10.1111\/ger.12602","article-title":"Oral diadochokinesis and associated oro-facial function in young and old German mother-tongue speakers: A cross-sectional study","volume":"39","author":"Schimmel","year":"2022","journal-title":"Gerodontology"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"753","DOI":"10.3390\/clinpract13040068","article-title":"Relationships between Lip Seal Strength, Tongue Pressure, and Daytime Sleepiness in Japanese Workers: A Cross-Sectional Study","volume":"13","author":"Minoura","year":"2023","journal-title":"Clin. Pract."},{"key":"ref_12","unstructured":"Ministry of Health, Labour and Welfare (2021). Abridged Life Table, Ministry of Health, Labour and Welfare."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1159\/000184539","article-title":"Analysis of diadochokinesis in ataxic dysarthria using the motor speech profile program","volume":"61","author":"Wang","year":"2009","journal-title":"Folia Phoniatr. Logop."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"399","DOI":"10.1007\/s40520-020-01547-7","article-title":"Oral diadochokinesis is related to decline in swallowing function among community-dwelling Japanese elderly: A cross-sectional study","volume":"33","author":"Takeuchi","year":"2021","journal-title":"Aging Clin. Exp. Res."},{"key":"ref_15","doi-asserted-by":"crossref","unstructured":"Ihara, Y., Kato, H., Tashimo, Y., Iizumi, Y., Fukunishi, Y., Sato, H., Shimane, T., and Takahashi, K. (2022). Changes in oral function, swallowing function, and quality of life in patients with head and neck cancer: A prospective cohort study. BMC Oral Health, 22.","DOI":"10.1186\/s12903-022-02329-5"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"451","DOI":"10.1111\/j.1447-0594.2012.00930.x","article-title":"Evaluation of a Japanese \u201cPrevention of long-term care\u201d project for the improvement in oral function in the high-risk elderly","volume":"13","author":"Sakayori","year":"2013","journal-title":"Geriatr. Gerontol. Int."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"317","DOI":"10.1111\/ger.12347","article-title":"Oral hypofunction in the older population: Position paper of the Japanese Society of Gerodontology in 2016","volume":"35","author":"Minakuchi","year":"2018","journal-title":"Gerodontology"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"521","DOI":"10.1093\/aje\/kwh261","article-title":"Sleep-disordered breathing, glucose intolerance, and insulin resistance: The Sleep Heart Health Study","volume":"160","author":"Punjabi","year":"2004","journal-title":"Am. J. Epidemiol."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"2384","DOI":"10.2337\/dc12-0841","article-title":"Obstructive sleep apnea in young lean men: Impact on insulin sensitivity and secretion","volume":"35","author":"Pamidi","year":"2012","journal-title":"Diabetes Care"},{"key":"ref_20","first-page":"3","article-title":"Prolongation of Oral Phase for Initial Swallow of Solid Food is Associated with Oral Diadochokinesis Deterioration in Nursing Home Residents in Japan: A Cross-Sectional Study","volume":"9","author":"Shimosaka","year":"2020","journal-title":"JAR Life"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"142","DOI":"10.1055\/s-0033-1359309","article-title":"Epidemiologic Profile of Patients with Snoring and Obstructive Sleep Apnea in a University Hospital","volume":"18","author":"Mendes","year":"2014","journal-title":"Int. Arch. Otorhinolaryngol."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"241","DOI":"10.1620\/tjem.236.241","article-title":"Tongue Protrusion Strength in Arousal State Is Predictive of the Airway Patency in Obstructive Sleep Apnea","volume":"236","author":"Kanezaki","year":"2015","journal-title":"Tohoku J. Exp. Med."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"258","DOI":"10.3143\/geriatrics.50.258","article-title":"[Oral diadochokinesis among Japanese aged over 55 years: Analysis of standard values]. Nihon Ronen Igakkai zasshi","volume":"50","author":"Hara","year":"2013","journal-title":"Jpn. J. Geriatr."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"83","DOI":"10.1007\/s00455-013-9486-5","article-title":"Reliability of measurements of tongue and hand strength and endurance using the Iowa Oral Performance Instrument with healthy adults","volume":"29","author":"Adams","year":"2014","journal-title":"Dysphagia"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"38","DOI":"10.1007\/s10266-008-0094-z","article-title":"Oral motor function and masticatory performance in the community-dwelling elderly","volume":"97","author":"Kikutani","year":"2009","journal-title":"Odontology"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"399","DOI":"10.1111\/j.1365-2842.2011.02268.x","article-title":"Gender differences in maximum voluntary lip-closing force during lip pursing in healthy young adults","volume":"39","author":"Murakami","year":"2012","journal-title":"J. Oral Rehabil."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"526","DOI":"10.1111\/joor.12776","article-title":"Ability to control directional lip-closing force during voluntary lip pursing in healthy young adults","volume":"46","author":"Miyamoto","year":"2019","journal-title":"J. Oral Rehabil."},{"key":"ref_28","doi-asserted-by":"crossref","unstructured":"Duran, S., and Erkin, \u00d6. (2021). Psychologic distress and sleep quality among adults in Turkey during the COVID-19 pandemic. Prog. Neuro-Psychopharmacol. Biol. Psychiatry, 107.","DOI":"10.1016\/j.pnpbp.2021.110254"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"591","DOI":"10.1177\/00220345211005782","article-title":"Dental Pain and Worsened Socioeconomic Conditions Due to the COVID-19 Pandemic","volume":"100","author":"Matsuyama","year":"2021","journal-title":"J. Dent. Res."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"875","DOI":"10.2147\/NSS.S271154","article-title":"Occupational Outcomes Associated with Sleep Quality and Excessive Daytime Sleepiness: Results from a National Survey","volume":"12","author":"AlShareef","year":"2020","journal-title":"Nat. Sci. Sleep"}],"container-title":["Clinics and Practice"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2039-7283\/14\/6\/196\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T16:32:21Z","timestamp":1760113941000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2039-7283\/14\/6\/196"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2024,11,14]]},"references-count":30,"journal-issue":{"issue":"6","published-online":{"date-parts":[[2024,12]]}},"alternative-id":["clinpract14060196"],"URL":"https:\/\/doi.org\/10.3390\/clinpract14060196","relation":{},"ISSN":["2039-7283"],"issn-type":[{"value":"2039-7283","type":"electronic"}],"subject":[],"published":{"date-parts":[[2024,11,14]]}}}