Abstract
[Background & objects] EGG and ECG-RRI have been studied during the stress of MDT in human subjects. Furthermore, respiratory frequency was recorded simultaneously. [Materials & Methods] EGGs (τ=5sec, high cut=0.5Hz) were recorded from epigastric, supraumbilical and infraumbilical regions and analyzed spectrally with MEM(maximal entropy method). Stress was loaded with MDT(tracing a star figure reflected on a mirror with an electric pen, giving click alarms, when tracing is run off the star egde). Respiratory frequency was monitored by a nasal thermister. Stress responses of EGG(peak power ratio of certain spectral peaks during MDT to those during at rest) were calculated. Informed consent was obtained from all subjects, healthy volunteers(n=33). [Results] Heart rate and respiratory frequency increased in 30 out of 33 cases during MDT-stress and means of them at rest(59.4/min and 12.7/min) increased significantly during the stress(65.5 and 18.4). Mean stress resonses EGG increased, especially 1, 3 and 6 cpm groups of infraumbilical region but inhibitory responses to the stress were also encountered in all EGG frequencies and at all three regions. [Discussion] The MDT stress induced the excitatory effects on heart and respiratory rate but it induced the dual excitatory and inhibitory effects on the EGG, gastrointestinal electrical activities in healthy volunteers. [Jpn J Physiol 54 Suppl:S117 (2004)]
