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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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 -
Community prevalence of positional obstructive sleep apnea
Duce, Brett L; Kulkas, Antti E; Leppänen, Timo T; Oksenberg, Arie; Töyräs, Juha; Hukins, Craig A, 2025, Journal of clinical sleep medicine, 21, 5, 875–882. A1 Journal article (refereed), original research -
Hypoxic Load and Average Oxygen-Saturation During Sleep and Wake Are Associated With Cognitive Function in Obstructive Sleep Apnea
Thorisdottir, K; Leppänen, T; Hrubos-Strøm, H; Richert, E; Biedebach, L; Jóhannsdóttir, K R; Arnardottir, E S; Jónsdóttir, M K, 2025, Journal of sleep research, [Epub ahead of print 3 July 2025], 1-11. A1 Journal article (refereed), original research -
Nocturnal short-term HRV reflects impaired daytime vigilance better than overnight HRV in suspected OSA patients
Hietakoste, Salla; Karhu, Tuomas; Lombardi, Carolina; Armañac-Julián, Pablo; Bailón, Raquel; Duce, Brett; Sillanmäki, Saara; Töyräs, Juha; Leppänen, Timo; Myllymaa, Sami; Kainulainen, Samu, 2025, Sleep, 48, 4, zsae282. A1 Journal article (refereed), original research -
Optimal Electroencephalogram and Electrooculogram Signal Combination for Deep Learning-based Sleep Staging
Tashakori, Masoumeh; Rusanen, Matias; Karhu, Tuomas; Huttunen, Riku; Leppanen, Timo; Nikkonen, Sami, 2025, IEEE journal of biomedical and health informatics, 29, 7, 4741-4747. A1 Journal article (refereed), original research -
Validation of manually scored multichannel frontal electroencephalography against polysomnography in a paediatric cohort
Sigurdardottir, Sigridur; Pitkänen, Henna; Korkalainen, Henri; Kainulainen, Samu; Serwatko, Marta; Olafsdottir, Kristin A; Sigurðardóttir, Sigurveig Þ; Clausen, Michael; Somaskandhan, Pranavan; Stražišar, Barbara G; Leppänen, Timo; Arnardottir, Erna Sif, 2025, Journal of sleep research, [First published: 13 February 2025], e70012. A1 Journal article (refereed), original research -
A comparative analysis of unsupervised machine‐learning methods in PSG‐related phenotyping
Ghorvei, Mohammadreza; Karhu, Tuomas; Hietakoste, Salla; Ferreira‐Santos, Daniela; Hrubos‐Strøm, Harald; Islind, Anna Sigridur; Biedebach, Luka; Nikkonen, Sami; Leppänen, Timo; Rusanen, Matias, 2024, Journal of sleep research, [First published: 24 October 2024], 1-13. A1 Journal article (refereed), original research -
Arousal burden is highest in supine sleeping position and during light sleep
Pitkänen, Minna; Huovinen, Juho; Rissanen, Marika; Pitkänen, Henna; Kainulainen, Samu; Penzel, Thomas; Fanfulla, Francesco; Anttalainen, Ulla; Saaresranta, Tarja; Grote, Ludger; Hedner, Jan; Staats, Richard; Duce, Brett; Töyräs, Juha; Oksenberg, Arie; Leppänen, Timo, 2024, Journal of clinical sleep medicine, 2025; 21, 2, 337-344. A1 Journal article (refereed), original research -
Beat-to-beat cardiac repolarization lability increases during hypoxemia and arousals in obstructive sleep apnea patients
Ebrahimian, Serajeddin; Sillanmäki, Saara; Hietakoste, Salla; Kulkas, Antti; Töyräs, Juha; Bailón, Raquel; Hernando, David; Lombardi, Carolina; Grote, Ludger; Bonsignore, Maria R; Saaresranta, Tarja; Pépin, Jean-Louis; Leppänen, Timo; Kainulainen, Samu, 2024, American journal of physiology : heart and circulatory physiology, 326, 5, H1094-H1104. A1 Journal article (refereed), original research
