Digital Plethysmographic Responses to Auditory Stimuli in Patients with Vibration Disease

The mechanism of a human reaction to vibration stress by palmar sweating in relation to autonomic nerve tone

“…The recovery course of the amplitude of the digital PTG once reduced by the stimulation was observed for 60 s. The pattern of the recovery process was classi®ed into four types as shown in Fig. 1 (Matoba et al 1975). With the normal (N) type, the amplitude reduced by the auditory stimulation was recovered within 30 s after cessation of the stimulus.…”

“…The activity level of the autonomic nerve tone was estimated by digital photoelectroplethysmogram (PTG) with auditory stimuli (Matoba et al 1975(Matoba et al , 1981. After resting in a relaxed state on a bed for 20 min, the examinations were commenced.…”

“…The probe was put on the tip of his right middle ®nger. Second, after con®rming that the amplitude of the digital PTG had been stabilized, auditory stimulation was given to the subject through a headphone for 10 s. The signal was white noise from the audiometer, which has an intensity of 90 dB(A) and a frequency of 800 Hz (Matoba et al 1975). The recovery course of the amplitude of the digital PTG once reduced by the stimulation was observed for 60 s. The pattern of the recovery process was classi®ed into four types as shown in Fig.…”

Clinical Features and Laboratory Findings of Vibration Disease: A Review of 300 Cases

“…The level of the autonomic nerve activity as expressed by the digital plethysmography with auditory stimulus was classified into 4 types: normal type (normoreactive, N type), intermediate and delayed type (hyperreactive, I and D types) and poor response type (hyporeactive, P type) (Matoba et al 1975c). The distribution of the levels of the autonomic nerve activity in 172 patients on admission was: N type 43 (25.0%), I type 40 (23.3%), D type 38 (22.1%) and P type 51 (29.6%).…”

Evaluation of Whole Body Transient Vibration by Finger-Tip Plethysmogram

“…6) It has been reported that, in unanaesthetised animals and in man, the peripheral vasoconstriction response appeared during whole-body vibration at moderate intensities.7)8)9)…”