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The .gov means it’s official. Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site. The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely. Share This paper presents an automatic stress-relieving music recommendation system (ASMRS) for individual music listeners. The ASMRS uses a portable, wireless photoplethysmography module with a finger-type sensor, and a program that translates heartbeat signals from the sensor to the stress index. The sympathovagal balance index (SVI) was calculated from heart rate variability to assess the user's stress levels while listening to music. Twenty-two healthy volunteers participated in the experiment. The results have shown that the participants' SVI values are highly correlated with their prespecified music preferences. The sensitivity and specificity of the favorable music classification also improved as the number of music repetitions increased to 20 times. Based on the SVI values, the system automatically recommends favorable music lists to relieve stress for individuals. Ho TC, et al. Annu Int Conf IEEE Eng Med Biol Soc. 2011;2011:1181-4. doi: 10.1109/IEMBS.2011.6090277. Annu Int Conf IEEE Eng Med Biol Soc. 2011. PMID: 22254526 Gäbel C, et al. Complement Med Res. 2017;24(2):97-103. doi: 10.1159/000455133. Epub 2017 Feb 3. Complement Med Res. 2017. PMID: 28192781 German. Bozkurt MR, et al. Australas Phys Eng Sci Med. 2019 Dec;42(4):959-979. doi: 10.1007/s13246-019-00796-9. Epub 2019 Sep 12. Australas Phys Eng Sci Med. 2019. PMID: 31515685 Bradt J, et al. Cochrane Database Syst Rev. 2009 Apr 15;(2):CD006577. doi: 10.1002/14651858.CD006577.pub2. Cochrane Database Syst Rev. 2009. PMID: 19370642 Updated. Review. Bradt J, et al. Cochrane Database Syst Rev. 2011 Aug 10;(8):CD006911. doi: 10.1002/14651858.CD006911.pub2. Cochrane Database Syst Rev. 2011. PMID: 21833957 Updated. Review. Cicone A, et al. Front Physiol. 2017 Sep 22;8:701. doi: 10.3389/fphys.2017.00701. eCollection 2017. Front Physiol. 2017. PMID: 29018352 Free PMC article. Govender M, et al. Games Health J. 2015 Oct;4(5):362-74. doi: 10.1089/g4h.2015.0014. Epub 2015 Jun 26. Games Health J. 2015. PMID: 26287927 Free PMC article.