Comparison of stress responses between mental tasks and white noise exposure.

Abstract:

:The purpose of this study was to compare the cardiovascular responses to different types of mental stress. Ten healthy males performed a mental arithmetic task (MA) on one day and were exposed to white noise (WN, 80dB) on another day. Both the MA and the WN were composed of four 5-min consecutive periods with a 3-min rest between them. On each day, the systolic and diastolic blood pressure (SBP and DBP), mean arterial pressure (MAP), cardiac output (CO), and total peripheral resistance (TPR) were measured continually during the entire experimental period. The changes from the baseline (Delta) in all periods were calculated for both mental stresses. As for the results, the DeltaMAP, DeltaCO, DeltaHR, and DeltaTPR in the MA did not significantly change during the task periods. However, in the WN, the DeltaMAP and DeltaTPR showed significant increases over the time of the consecutive periods. In addition, we discuss the response patterns for the two mental stresses. We examine three hemodynamic reactivity patterns: a cardiac pattern characterized by increased CO and decreased TPR, a mixed pattern characterized by a moderate increase in both CO and TPR, and a vascular pattern characterized by increased TPR and decreased CO. The results show that throughout all task/exposure periods, the response pattern remained the same for six subjects in each stress. Furthermore, of these six subjects, half showed the same response pattern in both the MA and the WN. In conclusion, compared to the MA task, consecutive WN exposure showed an accumulation of stress responses. A change in TPR contributed to a gradual increase in MAP in the WN. It is also possible that among the subjects there were different types of response to the MA and WN.

journal_name

J Physiol Anthropol

authors

Liu X,Iwanaga K,Shimomura Y,Katsuura T

doi

10.2114/jpa2.26.165

subject

Has Abstract

pub_date

2007-03-01 00:00:00

pages

165-71

issue

2

eissn

1880-6791

issn

1880-6805

pii

JST.JSTAGE/jpa2/26.165

journal_volume

26

pub_type

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