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Journal of Healthcare Engineering
Volume 2018 (2018), Article ID 6161525, 8 pages
Research Article

Earable RCC: Development of an Earphone-Type Reliable Chewing-Count Measurement Device

1Graduate School of Information Sciences, Hiroshima City University, 3-4-1 Ozukahigashi, Asaminami-ku, Hiroshima, Hiroshima 731-3194, Japan
2Wearable Media Laboratory, eRCC Co. Ltd., 21-3 Motomachi, Naka-ku, Hiroshima, Hiroshima 730-8504, Japan
3SAGA-KEN Medical Centre KOSEIKAN, 400 Nakabaru, Kasemachi, Saga, Saga 840-8571, Japan
4Faculty of Textile Science and Technology, Shinshu University, 3-15-1 Tokida, Ueda, Nagano 386-8567, Japan

Correspondence should be addressed to Kazuhiro Taniguchi

Received 2 November 2017; Accepted 25 December 2017; Published 12 February 2018

Academic Editor: Feng Liu

Copyright © 2018 Kazuhiro Taniguchi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Gastric cancer patients having undergone gastrectomy are at a high risk of becoming malnourished owing to decreased gastric function. To prevent malnutrition, patients need to thoroughly chew a mouthful of food at least 30 times. For these gastrectomy patients requiring dietary support, we developed a chewing-count measurement device named earable RCC using an earphone-type sensor. Experiments to evaluate the performance of this device were conducted on six healthy volunteers who participated in “gum-chewing tests” and “almond-eating tests.” The precision calculated based on the results was ≥0.958, indicating that the earphone-type chewing-count measurement device could experimentally distinguish chewing from other actions. In addition, the recall calculated from the test results was ≥0.937, showing that the device does not miss chewing actions and can accurately count the number of chews with high probability at the timing of chewing. The experimental results also imply that earphone-type sensors may be used to measure swallowing, occlusal force, and tongue motion. Our future plans include clinical testing of the earphone-type chewing-count measurement device to determine its utility in patients who have undergone gastrectomy. We also intend to expand the application of this device for use in other patients to aid in dementia prevention and dietary support.