title: A novel stress monitoring method through stress-induced respiratory alterations: non-contact measurement of respiratory V(T)/T(I) alterations induced by stressful sound using a 10 GHz microwave radar.
abstract: We have developed a non-contact stress monitoring system which measures respiratory V(T)/T(I) (tidal volume/inspiration time) alterations using a 10 GHz microwave radar. The measurable distance of the system is 50 cm, which is 10 times longer than our previously developed stress monitoring system which measures heart rate variability using a 24-GHz microwave-radar. The study was conducted with eight subjects (23 ± 1 years old) to evaluate the efficacy of the system. An audio stimulus at 95 dB sound pressure level was presented to the subjects following a silent period of 120 seconds. During the silent period, V(T)/T(I) averaged 826 ± 384 ml s(-1), while it increased significantly (p < 0.05) with an average of 1227 ± 704?ml s(-1) during audio stimulus low frequency component (LF)/high frequency component (HF), which reflects sympatho-vagal valance, showed a peak during audio stimuli. This paper aims to study the efficacy of the non-contact stress monitoring system for its future applications in many fields including health and safety.
authors: Department of Management Systems Engineering, Tokyo Metropolitan University , 6-6 Asahigaoka, Hino, Tokyo 191-0065, Japan.
authors: S
authors: S
authors: Gotoh
authors: G
authors: G
authors: Sun
authors: M
authors: M
authors: Kagawa
authors: T
authors: T
authors: Matsui
mesh_terms: D004867:Equipment Design; D006801:Humans; D007320:Inspiratory Capacity; D008872:Microwaves; D008991:Monitoring, Physiologic / Q000295:instrumentation / Q000379:methods; D011825:Radar / Q000295:instrumentation; D015656:Respiratory Mechanics; D013312:Stress, Physiological; D013997:Time Factors; D055815:Young Adult