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First noncontact millimeter-wave radar measurement of heart rate in great apes: validation in chimpanzees (Pan troglodytes)


  • Matsumoto, Takuya Faculty of Science, Shinshu University
  • Iwata, Itsuki Department of Electrical Engineering, Graduate School of Engineering, Kyoto University
  • Sakamoto, Takuya Department of Electrical Engineering, Graduate School of Engineering, Kyoto University
  • Hirata, Satoshi Kumamoto Sanctuary, Wildlife Research Center, Kyoto University




noncontact measurement、 vital sign、 heart rate、 millimeter-wave ultrawide-band array radar、 animal welfare


Heart rate is a crucial vital sign and a valuable indicator for assessing the physical and psychological condition of a target animal. While medium- and long-term stress levels have been evaluated by measuring bioactive substances in samples such as urine, feces, and body hair, it is assumed that short-term changes can be measured by measuring the changes in physical and psychological state by comprehending the heart rate. Heart rate has been measured using a contact-type device; however, the device burdens the target animals and that there are risks associated with anesthesia during installation. This study explores the application of heartbeat measurement techniques using millimeter-wave radar, primarily developed for humans, as a remote method for measuring the heart rate of great apes. This approach has yielded significant insights into the evolutionary history of humans. Through a measurement test conducted on two chimpanzees, we observed a remarkable correspondence between the peak frequency spectrum of heart rate estimated using millimeter-wave radar and the mean value obtained from electrocardiograph data, thereby validating the accuracy of the method. To the best of our knowledge, this is the first demonstration of the precise measurement of great apes’ heart rate using millimeter-wave radar technology. Consequently, this study unveils the potential for establishing a health management system for endangered great apes, estimating their metabolic rate, and elucidating social stressors.


The authors declare that they have no conflicts of interest.

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Anestis, S. F. (2005). Behavioral style, dominance rank, and urinary cortisol in young chimpanzees (Pan troglodytes). Behaviour, 142(9-10), 1245-1268. doi: 10.1163/156853905774539418

Aureli, F., Preston, S. D., & de Waal, F. (1999). Heart rate responses to social interactions in free-moving rhesus macaques (Macaca mulatta): a pilot study. Journal of Comparative Psychology, 113(1), 59-65. doi:10.1037/0735-7036.113.1.59.

Boysen, S. T., & Berntson, G. G. (1989). Conspecific recognition in the chimpanzee (Pan troglodytes): cardiac responses to significant others. Journal of Comparative Psychology, 103(3), 215-220. doi:10.1037/0735-7036.103.3.215

Duboscq, J., Romano, V., Sueur, C., & MacIntosh, A. J. (2016). Scratch that itch: Revisiting links between self-directed behaviour and parasitological, social and environmental factors in a free-ranging primate. Royal Society Open Science, 3(11), 160571. doi:10.1098/rsos.160571

Halsey, L. G., Green, J. A., Twiss, S. D., Arnold, W., Burthe, S. J., Butler, P. J., Cooke, S. J., Grémillet, D., Ruf, T., Hicks, O., Minta, K. J., Prystay, T. S., Wascher, C. A. F., & Careau, V. (2019). Flexibility, variability and constraint in energy management patterns across vertebrate taxa revealed by long‐term heart rate measurements. Functional Ecology, 33(2), 260-272. doi:10.1111/1365-2435.13264

Higham, J. P., Maclarnon, A. M., Heistermann, M., Ross, C., & Semple, S. (2009). Rates of self-directed behaviour and faecal glucocorticoid levels are not correlated in female wild olive baboons (Papio hamadryas anubis). Stress, 12(6), 526-532. doi:10.3109/10253890902756565

Hirata, S., & Fuwa, K. (2007). Chimpanzees (Pan troglodytes) learn to act with other individuals in a cooperative task. Primates; Journal of Primatology, 48(1), 13-21. doi:10.1007/s10329-006-0022-1

Iwata, S., Koda, T., & Sakamoto, T. (2021). Multiradar data fusion for respiratory measurement of multiple people. IEEE Sensors Journal, 21(22), 25870-25879. doi:10.1109/jsen.2021.3117707

Kindt, C. W., & Spelman, F. A. (1979). Monitoring and apnea alarm for infant primates: practical and research applications. In G. C. Ruppenthal & D. J. Reese (Ed.), Nursery Care of Nonhuman Primates (pp. 215-225). Boston, MA: Springer US.

Koda, N., Machida, S., Goto, S., Nakamichi, M., Itoigawa, N., & Minami, T. (1998). Cardiac and behavioral responses to humans in an adult female japanese monkey (Macaca fuscata). Anthrozoös, 11(2), 74-78. doi:10.2752/089279398787000797

Koda, T., Sakamoto, T., Okumura, S., & Taki, H. (2021). Noncontact respiratory measurement for multiple people at arbitrary locations using array radar and respiratory-space clustering. arXiv preprint arXiv:2101.12422.

Kutsukake, N. (2003). Assessing relationship quality and social anxiety among wild chimpanzees using self-directed behaviour. Behaviour. 140(8-9), 1153-1171. doi: 10.1163/156853903322589687

Matsumoto, T., Okumura, S., & Hirata, S. (2022). Non-contact respiratory measurement in a horse in standing position using millimeter-wave array radar. Journal of Veterinary Medical Science, 84(10), 1340-1344. doi:10.1292/jvms.22-0238

Myowa-Yamakoshi, M., Scola, C., & Hirata, S. (2012). Humans and chimpanzees attend differently to goal-directed actions. Nature Communication, 3, 693. doi:10.1038/ncomms1695

Portier, K., & Ida, K. K. (2020). Editorial: Anesthetic risk and complications in veterinary medicine. Frontiers in Veterinary Science, 7, 397. doi:10.3389/fvets.2020.00397

Preis, A., Samuni, L., Mielke, A., Deschner, T., Crockford, C., & Wittig, R. M. (2018). Urinary oxytocin levels in relation to post-conflict affiliations in wild male chimpanzees (Pan troglodytes verus). Hormones and Behavior, 105, 28-40. doi:10.1016/j.yhbeh.2018.07.009

Rong, Y., Dutta, A., Chiriyath, A., & Bliss, D. W. (2021). Motion-tolerant non-contact heart-rate measurements from radar sensor fusion. Sensors (Basel), 21(5). doi:10.3390/s21051774

Rzucidlo, C. L., Curry, E., & Shero, M. R. (2023). Non-invasive measurements of respiration and heart rate across wildlife species using Eulerian video magnification of infrared thermal imagery. BMC Biology, 21(1), 61. doi:10.1186/s12915-023-01555-9

Sakamoto, T., Imasaka, R., Taki, H., Sato, T., Yoshioka, M., Inoue, K., Sakai, H. (2016). feature-based correlation and topological similarity for interbeat interval estimation using ultrawideband radar. IEEE Transactions on Bio-Medical Engineering, 63(4), 747-757. doi:10.1109/TBME.2015.2470077

Sakamoto,T., Sanematsu, D., Iwata, I., Minami, T., & Myowa, M. (2023). Radar-based respiratory measurement of a rhesus monkey by suppressing nonperiodic body motion components, arXiv:2306.16712

Santarpia, J. L., Rivera, D. N., Herrera, V. L., Morwitzer, M. J., Creager, H. M., Santarpia, G. W., Crown, K. K., Brett-Major, D. M., Schnaubelt, E. R., Broadhurst, M. J., Lawler, J. V., Reid, S. P., & Lowe, J. J. (2020). Aerosol and surface contamination of SARS-CoV-2 observed in quarantine and isolation care. Scientific Reports, 10(1), 12732. doi:10.1038/s41598-020-69286-3

Sato, Y., Kano, F., & Hirata, S. (2018). Cutting-edge infrared thermography as a new tool to explore animal emotions. Japanese Journal of Animal Psychology, 68(1), 1-15. doi:10.2502/janip.68.1.7

Spelman, F., & Kindt, C. (1979). Monitoring and apnea alarm for infant primates: Apparatus. Nursery care of nonhuman primates, 203-213.

Takeda, K.-i., Sato, S., & Sugawara, K. (2000). The number of farm mates influences social and maintenance behaviours of Japanese Black cows in a communal pasture. Applied Animal Behaviour Science, 67(3), 181-192. doi:10.1016/S0168-1591(99)00124-0

Tuan, S.-A., Rustia, D. J. A., Hsu, J.-T., & Lin, T.-T. (2022). Frequency modulated continuous wave radar-based system for monitoring dairy cow respiration rate. Computers and Electronics in Agriculture, 196. doi:10.1016/j.compag.2022.106913

Wang, D., Eckert, J., Teague, S., Al-Naji, A., Haun, D., & Chahl, J. (2023). Estimating the cardiac signals of chimpanzees using a digital camera: validation and application of a novel non-invasive method for primate research. Behavior Research Methods. doi:10.3758/s13428-023-02136-y

Wascher, C. A. F. (2021). Heart rate as a measure of emotional arousal in evolutionary biology. Philosophical transactions of the Royal Society of London. Series B, Biological sciences, 376(1831), 20200479. doi:10.1098/rstb.2020.0479

Whitham, J. C., & Miller, L. J. (2016). Using technology to monitor and improve zoo animal welfare. Animal Welfare, 25(4), 395-409. doi:10.7120/09627286.25.4.395



投稿日時: 2023-07-15 05:54:30 UTC

公開日時: 2023-07-19 00:39:23 UTC