Timo Leppänen
Professor
Co-head of the Sleep Technology and Analytics Research Group (STAR)
Department of Technical Physics, Faculty of Science, Forestry and Technology
[email protected] | +358 50 310 1828
I started my studies in the University of Eastern Finland in 2011 after two years in the service for the Finnish Defense Forces. I got my bachelor, master and doctoral degrees in five years in 2016 at the age of 26 years and my thesis earned a grade of approved with distinction (which is awarded only if dissertation falls in the category of top 5% of its field). Since then, I have been a co-head and principal investigator in the STAG, a research team focusing on sleep-related disorders and development of novel methods and computational tools for sleep data analysis. Furthermore, I have established a wide international collaboration network with world’s top-level scientists and research infrastructures as well as companies operating at business sector. My research is mainly funded by the the Academy of Finland (Postdoctoral Researcher), Business Finland (NordicPerMed project NordSleep) and private foundations.
My research is focused on development of novel diagnostic parameters, mathematical solutions, and paradigms for severity estimation of obstructive sleep apnea. Therefore, it is very closely related to medical physics but it has also strong interface with clinical medicine. Thus, my research is a great example of interdisciplinary research in University of Eastern Finland but also of active research collaboration between University of Eastern Finland and Kuopio University Hospital.
Keywords
Publications
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Artificial intelligence in sleep medicine I: Diagnosis, treatment, care, and research
Sharafkhaneh, Amir; Hirshkowitz, Max; Razjouyan, Javad; BaHammam, Ahmed; Leppanen, Timo; Shin, Chol; Korkalainen, Henri; Penzel, Thomas, 2026, Sleep medicine reviews, 88, 102295. A2 Review article, Literature review, Systematic review -
Association of major adverse cardiovascular events with the apnea-hypopnea index, desaturation severity parameters, and cardiac troponins in participants of the Akershus Sleep APnea (ASAP) cohort
Feng, Xin; Sigurdardottir, Fjola; Arnardottir, Erna Sif; Dammen, Toril; Einvik, Gunnar; Korkalainen, Henri; Klungsøyr, Ole; Leppänen, Timo; Nordhus, Inger Hilde; Nikkonen, Sami; Töyräs, Juha; Thorshov, Thea; Øverby, Tonje Caroline; Omland, Torbjørn; Hrubos-Strøm, Harald, 2026, Sleep, 49, 8, zsag013. A1 Journal article (refereed), original research -
Electromyography Frequency Spectrum Is a Better Indicator of Sleep Bruxism Severity Related to Temporomandibular Disorder Pain Than Conventional Masticatory Muscle Activation and Bruxism Time Indices—A Pilot Study
Pitkänen, Minna; Rytkönen, Miro; Miettinen, Tomi; Ahlberg, Jari; Lobbezoo, Frank; Myllymaa, Katja; Töyräs, Juha; Leppänen, Timo; Myllymaa, Sami, 2026, Journal of sleep research, 35, 4, e70287. A1 Journal article (refereed), original research -
Five-year longitudinal changes in oxygen saturation parameters in Obstructive Sleep Apnoea: Impact of age, body mass index, and comorbidities
Howarth, Timothy P; Karhu, Tuomas; Leppänen, Timo; Saad, Helmi Ben; Bahammam, Ahmed; Nikkonen, Sami, 2026, Sleep medicine, 143, 108866. A1 Journal article (refereed), original research -
Hypnodensity sleep metrics from fingertip photoplethysmography are better associated with daytime sleepiness and fatigue than traditional metrics from polysomnography
Rusanen, Matias; Tuyinsenge, Viateur; Muller, Sandrine; Tamisier, Renaud; Baillieul, Sébastien; Myllymaa, Sami; Kainulainen, Samu; Leppänen, Timo; Pepin, Jean-Louis; Bailly, Sébastien, 2026, Pulmonology, 32, 1, 2683326. A1 Journal article (refereed), original research -
Respiratory event type and duration modulate PPG waveforms in OSA
Nurminen, Jutta; Hietakoste, Salla; Howarth, Timothy; Duce, Brett; Leppänen, Timo; Laitinen, Teemu; Kulkas, Antti; Kainulainen, Samu, 2026, Physiological measurement, 47, 7, 075006. A1 Journal article (refereed), original research -
Review of Hypoxemia Quantification Methods for Assessing the Severity of Obstructive Sleep Apnea
Pahari, Purbanka; Nikkonen, Sami; Howarth, Timothy; Parekh, Ankit; Bubu, Omonigho Michael; Töyräs, Juha; Leppänen, Timo; Korkalainen, Henri, 2026, Current sleep medicine reports, 12, 1, 46. A2 Review article, Literature review, Systematic review -
The Relative Contributions of Arousal Presence and Arousal Intensity to Post-Respiratory-Event Ventilation in Obstructive Sleep Apnea
Zhang, Junyan; Mann, Dwayne; Leppanen, Timo; Azarbarzin, Ali; Sands, Scott; Töyräs, Juha; Terrill, Philip, 2026, Journal of sleep research, [Epub ahead of print 29 July 2026], 1-12. A1 Journal article (refereed), original research -
A novel mobile application to examine impaired vigilance through digital means
Pahari, Purbanka; Schmitz, Lisa; Richert, Elena; Jóhannsdóttir, Kamilla Rún; Kristbergsdóttir, Hlín; Korkalainen, Henri; Töyräs, Juha; Leppänen, Timo; Nikkonen, Sami; Arnardottir, Erna Sif; Islind, Anna Sigridur, 2025, Scientific reports, 15, 1, 39115. A1 Journal article (refereed), original research -
An explainable deep-learning approach to detect pediatric sleep apnea from single-channel airflow
Barroso-Garcia, Veronica; Vaquerizo-Villar, Fernando; Gutierrez-Tobal, Gonzalo C; Dayyat, Ehab; Gozal, David; Leppanen, Timo; Hornero, Roberto, 2025, IEEE journal of translational engineering in health and medicine, 13, 517-531. A1 Journal article (refereed), original research
