Techniques of Plethysmography

Brown, Clinton C.; Giddbon, Donald B.; Déan, Eric

doi:10.1111/j.1469-8986.1965.tb03243.x

Cited by 43 publications

(10 citation statements)

References 7 publications

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“…We speculate that during mental workload, peripheral circulation decreases with activation of sympathetic nerve balance. The FPG reportedly reflects sympathetic nerve activity [37], and alpha-adrenergic sympathetic nerve activity in the skin of the fingertips increases as a result of psychological stimulation [6,38]. Increased sympathetic nerve activity due to psychological and physical strain is commonly known to cause constriction of peripheral arteries.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of mental stress by physiological indices derived from finger plethysmography

Minakuchi

Ohnishi

et al. 2013

J Physiol Anthropol

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BackgroundQuantitative evaluation of mental stress is important to prevent stress-related disorders. Finger plethysmography (FPG) is a simple noninvasive method to monitor peripheral circulation, and provides many physiological indices. Our purpose is to investigate how FPG-derived indices reflect on mental stress, and to clarify any association between these physiological indices and subjective indices of mental stress.MethodsThirty-one healthy women (mean age, 22 years ± 2) participated. The participants rested by sitting on a chair for 10 min. They then performed a computerized version of the Stroop color-word conflict test (CWT) for 10 min. Finally, they rested for 10 min. FPG was recorded throughout the experiment. The participants completed a brief form of the Profile of Mood States (POMS) questionnaire before and after the test. Using the FPG data, we conducted chaos analysis and fast Fourier transform analysis, and calculated chaotic attractors, the largest Lyapunov exponent, a high-frequency (HF) component, a low-to-high-frequency (LF/HF) ratio, finger pulse rate and finger pulse wave amplitude.ResultsThe HF component decreased and the LF/HF ratio increased significantly during the test (P < 0.01), while the confusion subscale of POMS increased after the test (P < 0.05). During testing, finger pulse rate significantly increased (P < 0.001), and the finger pulse wave amplitude decreased (P < 0.001). The attractor size reduced during testing and returned to a baseline level afterwards. Although the largest Lyapunov exponent showed no significant change during testing, significant negative correlation with the tension-anxiety subscale of POMS was observed at the beginning (P < 0.01). A significant negative correlation between the LF/HF ratio and two subscales was also observed in the beginning and middle of the test (P < 0.05). There were no correlations during the rest periods.ConclusionsThe physiological indices derived from FPG were changed by mental stress. Our findings indicate that FPG is one of the easiest methods to evaluate mental stress quantitatively. In particular, the largest Lyapunov exponent and the LF/HF ratio might be associated with acute mental stress. Farther examination is needed to find any association between the physiological indices and various types of mental stress.

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Section: Discussionmentioning

confidence: 99%

Evaluation of mental stress by physiological indices derived from finger plethysmography

Minakuchi

Ohnishi

et al. 2013

J Physiol Anthropol

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“…His conclusions were that schizophrenic patients and those with other mental diseases had a reduced blood flow, probably due to an excessive vasoconstrictor tone. There have been, however, numerous reports of disturbances of the peripheral circulation in schizophrenics based on observations of cyanotic extremities, increased circulation time, abnormal skin temperature and other types of plethysmographic studies ( Brown (1967), Feer (1962, Henschel et al (1951), Shattock & Oxon (1950), Vanderhoof et al (1966). It is therefore even more surprising that it is actually our finger blood flow data that have shown the most clear-cut differences between the different subject groups and that these differences remain quite consistent throughout the study session under all experimental conditions.…”

Section: Discussionmentioning

confidence: 99%

Psychophysiological studies in schizophrenic patients selected on the basis of a “genetic marker”

Maricq¹,

Weinrich²

1980

Acta Psychiatr Scand

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Psychophysiological studies in schizophrenics have generally resulted in contradictory and inconclusive reports. The purpose of the present study was to determine whether a better psychophysiological separation of schizophrenic and control subjects could be accomplished by selecting them on the basis of a biological marker: the high plexus visualization score (PVS). Finger blood flow, skin temperature and electrodermal recovery rates were studied in 64 male schizophrenics (33 high PVS and 31 low PVS) and 24 male controls (10 high PVS and 14 low PVS) matched for age. All control subjects and 30 of the schizophrenics (16 high PVS and 14 low PVS) had been drug-free for at least 1 month. They were studied in a sound attenuated, temperature controlled room under 12 experimental conditions. The results demonstrate that, as predicted, schizophrenics with high PVS have the lowest finger blood flow rates, the lowest skin temperatures and the slowest GSR recovery rates of all groups studied. The largest difference in all three variables was found between high PVS schizophrenics and high PVS controls. The blood flow rates and the skin temperature were higher and the electrodermal responses were fewer in patients taking medications than in those receiving placebos. A suggestion of a bimodal distribution into "responders" and "non-responders" was apparent only in patients receiving medications.

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“…Apparatus. Vascular activity was recorded by photometric plethysmography (Brown, Giddon, & Dean, 1965). The transducers were Clairex 604-L photoresistive cells mounted in aluminum holders of appropriate configuration.…”

Section: Methodsmentioning

confidence: 99%

The “Respiratory Vasomotor Reelex” in the Eorehead and Einger

Royer

1966

Psychophysiology

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The so‐called respiratory vasomotor reflex, long observed in plethysmography of the extremities, was examined in seven normal Ss ranging in age from 17 to 38 years. With a photometric method, the vascular responses of the skin of the forehead and the finger were found to differ following a deep breath like a sigh. These responses were quite similar to the vascular components of the orienting reflex, i.e., vasodilation in the forehead and vasoconstriction in the hand. A polyphasic response in the forehead in some Ss followed the deliberate deep inspirations. This polyphasic response has also been observed during the orieinting reflex but without changes in respiration. This type of response appears to be associated with bradycardia, and may be related to similar vascular responses observed following cardiac arrhythmias.

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Techniques of Plethysmography

Cited by 43 publications

References 7 publications

Evaluation of mental stress by physiological indices derived from finger plethysmography

Evaluation of mental stress by physiological indices derived from finger plethysmography

Psychophysiological studies in schizophrenic patients selected on the basis of a “genetic marker”

The “Respiratory Vasomotor Reelex” in the Eorehead and Einger

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