Analysis of Heart Rate Variability during Mental Task with Reference to Ambient Temperature.

Ishibashi, Keiichiro; Yasukouchi, Akira

doi:10.2114/jpa.18.219

Cited by 8 publications

(6 citation statements)

References 23 publications

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“…, ambient temperatures and illumination levels were significantly different across the two conditions. In general, lower ambient temperatures have been shown to reduce the subjects’ HR [ 48 ] and increase their SBP and DBP [ 49 ]. However, previous studies have been conducted under even greater changes in ambient temperature, i.e.…”

Section: Discussionmentioning

confidence: 99%

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Impact of Viewing vs. Not Viewing a Real Forest on Physiological and Psychological Responses in the Same Setting

Horiuchi

Endo

Takayama

et al. 2014

IJERPH

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We investigated the impact of viewing versus not viewing a real forest on human subjects’ physiological and psychological responses in the same setting. Fifteen healthy volunteers (11 males, four females, mean age 36 years) participated. Each participant was asked to view a forest while seated in a comfortable chair for 15 min (Forest condition) vs. sitting the same length of time with a curtain obscuring the forest view (Enclosed condition). Both conditions significantly decreased blood pressure (BP) variables, i.e., systolic BP, diastolic BP, and mean arterial pressure between pre and post experimental stimuli, but these reductions showed no difference between conditions. Interestingly, the Forest viewing reduced cerebral oxygenated hemoglobin (HbO2) assessed by near-infrared spectroscopy (NIRS) and improved the subjects’ Profile of Mood States (POMS) scores, whereas the Enclosed condition increased the HbO2 and did not affect the POMS scores. There were no significant differences in saliva amylase or heart rate variability (HRV) between the two conditions. Collectively, these results suggest that viewing a real forest may have a positive effect on cerebral activity and psychological responses. However, both viewing and not viewing the forest had similar effects on cardiovascular responses such as BP variables and HRV.

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Section: Discussionmentioning

confidence: 99%

“…However, previous studies have been conducted under even greater changes in ambient temperature, i.e. , 21 °C vs. 28 °C [ 48 ] and 15 °C vs. 0.5 °C [ 49 ]. Moreover, in the aforementioned study, the 7 °C change from 15 °C–8 °C did not alter the subjects’ SBP and DBP values [ 49 ].…”

Section: Discussionmentioning

confidence: 99%

Impact of Viewing vs. Not Viewing a Real Forest on Physiological and Psychological Responses in the Same Setting

Horiuchi

Endo

Takayama

et al. 2014

IJERPH

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“…Several other authors described similar dynamics of the heart rate during mental load too see e.g. 2,3,4,5,11 . The increased activity of the sympathetic nervous system was probably the main cause of subjects' high heart rate when they solved the cognitive tasks.…”

Section: Discussionmentioning

confidence: 66%

Pictorial Cognitive Task Resolution and Expired Minute Ventilation, Oxygen Consumption, Carbon Dioxide Production and Heart Rate

Petřek¹

2009

Biomed Pap Med Fac Univ Palacky Olomouc Czech Repub

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Aims:To assess the impact of cognitive task solving on respiratory and cardiovascular parameters. Methods: The ML870B80 Exercise Physiology System was used to record concurrently with EEG, the cardiorespiratory and metabolic functions of subjects during cognitive activity. The Expired Minute Ventilation (V E ), Oxygen Consumption (V O2 ), Carbon Dioxide Production (V CO2 ) and Average Heart Rate (BPM) were ascertained for four periods: (1) rest or starting period, (2) reference period, (3) cognitive task solving period and (4) recovery period. Each period was defined by the type of presented visual stimuli and by the prearranged cognitive activity related to visual stimuli. The personality traits of participants were also determined.Results: The momentary functional state of subject's brain (i.e. the period of the experiment) determined the average values of all measured parameters. During the cognitive task solving period the average V E , V O2 and V CO2 reached the lowest values while the HR behaved reversely -it was the highest in the cognitive task solving period. Further, the average V E , V CO2 and HR values but not V O2 value differed significantly from average values for the same variable measured in the rest period.Conclusion: The changes in respiratory variables during the cognitive task solving period predicate the whole-body metabolic rate rather than the energy metabolism of the brain alone. However, the heart rate related to some personality traits of the subject has a tighter relation to brain's energy metabolic rate during the cognitive task solving -it affects the oxygen supply of the brain.

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“…Given that the stimuli in these factors are divided into passive and active inputs, environmental and mental factors deliver passive and active stimuli to the autonomic nerves, respectively. Through investigations on the combined effects of environmental and mental factors on cardiac autonomic responses (Ishibashi and Yasukouchi, 1999), it is suggested that parasympathetic activity might control the basal effect of ambient temperature and the other components, including sympathetic activity contributing to the increase in HR due to mental tasks. A notable result was that the mental task activated HR consistently via sympathetic control as active stimuli, while the parasympathetic activity was affected gradually with alterations of the ambient temperature as passive stimuli.…”

Section: Introductionmentioning

confidence: 99%

“…However, they provided no information about the effect of mental tasks on HR under progressive autonomic alterations by passive stimuli. Previous study (Ishibashi and Yasukouchi, 1999) has shown the effect of mental task under gradual alteration of parasympathetic activity is portrayed as passive stimuli. In this study, therefore, we investigated the effect of mental tasks on autonomic control during physiological manoeuvre, such as passive graded head-up tilting, that increases sympathetic activities (Iwase et al, 1987;Mukai and Hayano, 1995).…”

Section: Introductionmentioning

confidence: 99%

Effects of Mental Task on Heart Rate Variability during Graded Head-Up Tilt.

Ishibashi¹,

Ueda²,

Yasukouchi³

1999

Appl Human Sci

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Abstract. In this study, we used spectral analysis of heart rate variability (HRV) to estimate the changes in autonomic control in response to disparate stimuli produced by mental task and graded head-up tilting. The low frequency (LF) component of HRV provided a quantitative index of the sympathetic and parasympathetic (vagal) activities controlling the heart rate (HR), while the high frequency (HF) component of HRV provided an index of the vagal tone. We studied 17 healthy male subjects (21-25 yr of age) who were placed on a tilt-table and the graded tilt-protocol involved tilted sine angles 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0. These tilt-protocols were repeated with or without the mental task, which consisted of auditory distinctive reactiontime tasks. The basal autonomic mode against the graded head-up tilt was characterized by reciprocal changes in sympathetic and vagal tones. There were significant increases of HR corresponding to the mental task with lower tilt-angle, albeit the changes with higher tilt angles were not significant. Furthermore, there were increases and decreases of the LF component induced by the mental task at lower and higher tilt-angles, respectively. These results revealed that the different responses of HR and LF component against the same tasks could be derived from the alterations of autonomic mode during gradual changes in autonomic control.

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Analysis of Heart Rate Variability during Mental Task with Reference to Ambient Temperature.

Cited by 8 publications

References 23 publications

Impact of Viewing vs. Not Viewing a Real Forest on Physiological and Psychological Responses in the Same Setting

Impact of Viewing vs. Not Viewing a Real Forest on Physiological and Psychological Responses in the Same Setting

Pictorial Cognitive Task Resolution and Expired Minute Ventilation, Oxygen Consumption, Carbon Dioxide Production and Heart Rate

Effects of Mental Task on Heart Rate Variability during Graded Head-Up Tilt.

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