A Study of Human Fatigue State Based on an Audiocardiography System by Using Recurrence Plot Analysis

• Main Authors: Chie-ChiaYoung, 楊哲嘉
• Other Authors: Fang-Min Yu
• Format: Others
• Language: en_US
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/28255350801440756531

碩士 === 國立成功大學 === 航空太空工程學系碩博士班 === 100 === The Audiocardiography system is developed from hemodynamics theory. It measuring and recording the pulse wave on the wrist artery which contains various cardiovascular system information. Human fatigue is a physiological condition, which due to over time work or stressful environment. At fatigue state, the physiological adjustment changes which cause a variation to the cardiovascular system. Recurrence plot analysis is a powerful method to analyze non-linear dynamic system and to observe hidden characters. This research collects data through an non-invasive audiocardiography system proposed by Dr. Yu. In this thesis, data from two groups of participants are collected and PSD, Poincare’ plot and recurrence plot is adopted to analyze fatigue. Group one is long-term working type from restaurant workers with 16 participants all experience 8 to 10 hour of work. The analysis result shows that that HRV is lower and parasympathetic nerves are activated after work. Recurrence plot and its’ quantitative indexes show that the adjustment function of cardiovascular is better before work and much worse after work. The other group is short-term working type from car drivers with 15 participants experience a 60 to 75 minutes driving task though a particular route. The PSD shows that the diners are at a stressful state during the task. Recurrence plot and its’ quantitative plot shows that the HRV is higher and the cardiovascular is adjusting actively through the task.