Yukihiro Sawada
Biographic Data
| ID | 8863586 |
|---|---|
| NAME | Yukihiro Sawada |
| GIVEN NAMES | Yukihiro |
| FAMILY NAME | Sawada |
| SIGNATURE | SAWADA Y |
| AFFILIATIONS | Sapporo Medical University |
| VERIFIED | No |
| TOTAL WORKS | 12 |
| TOTAL CITATIONS | 0 |
| AUTHOR COUNT | 12 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 1991 |
| LATEST PUBLICATION YEAR | 2023 |
| H-INDEX | 0 |
Assessment of Construct Validity of Recovery Measures through Theoretical Formulations as Applied to Cardiovascular Parameters
The recovery period is generally excluded under stress testing, despite its importance, because recovery measures lack information on construct validity. The smaller the carryover effect, the higher the construct validity. Theoretical formulae were derived for three recovery measures (i.e., total carryover [TCO], mean recovery rate [MRR], and area under the curve [AUC]) to assess to what extent this criterion is fulfilled. The cardiovascular para…
The association between chronic psychosocial stress, allostatic load, and vascular health in asymptomatic young men
A novel index of finger arterial stiffness (FSI) was tested in terms of the relationship with risk markers for preclinical cardiovascular disease. In addition, we examined if the association between psychosocial factors and FSI was explained by allostatic load markers in 37 healthy young men aged 24.8 ± 4.0 years. The FSI was devised based on an exponential model of the finger arterial pressure‐volume relationship. The allostatic load index (ALI)…
Mean recovery rate
Assessment of recovery is important for the investigation of stress but has been compounded by difficulties, in particular contamination by the carryover effect. In the present study, the mean recovery rate ( MRR ) was used in order to overcome this difficulty. First, the validity of the MRR was demonstrated theoretically. Second, it was demonstrated experimentally, when a comparison was made with the validity of the mean recovery per se. In the …
Balance of blood pressure equivalents as a new quantitative scale for identifying cardiac versus vascular reactor
A quantitative scale for identifying cardiac versus vascular reactor, balance of blood pressure equivalents ( BE ), was newly advocated and compared with a very recently advocated one, hemodynamic profile ( HP ), by Gregg, Matyas and James (2002). BE was defined as “ (Δ Q/Q 0 ) P 0 ′ − ( Δ R/R 0 )P 0 .” Here, P 0 , Q 0 , and R 0 were mean blood pressure ( P ), cardiac output ( Q ), and total peripheral resistance ( R ) during baseline, and Δ Q an…
Attention‐Affect Check List
Given a hint from Lang, Bradley, and Cutbert's (1997 ) defense cascade, two cognitive processes, instead of passive versus active behavioral coping, which seem to have differential effects on the provocation of vascular‐ versus cardiac‐dominant reaction pattern during mental stress were advocated: attention ( Attent ) versus unpleasant affect ( UnplAff ). Based on this notion the Attention‐Affect Check List (AACL) was developed as a self‐report m…
Normalized pulse volume and blood volume as separate indices of finger arterial and venous vascular tone
This study examined the newly proposed indices for estimating finger vascular tone, which can be obtained from near infrared transmittance photoplethysmographic recordings; normalized pulse volume (NPV) and blood volume (BV). They were recorded for seven male and two female students under continuous infusion of and recovery from propofol. Concomitant hemodynamic measurements were made with a non‐invasive impedance cardiograph and a continuous blo…
Blood pressure and heart rate responses to an intrusion on personal space
Yaezawa and Yoshida's (1981 ) findings on the effects of an intrusion on personal space were reinvestigated. Thirty‐five female students were confronted with the approach of a male stranger, and blood pressure (BP) and heart rate (HR) were monitored. Throughout the model's approach, HR showed a significant triphasic change (an initial decrease, a subsequent increase, and then a secondary decrease), whereas subjective feelings of anxiety and tensi…
Evaluation of pre‐operative anxiety and propofol‐induced sedation using newly proposed indices of finger vascular tone
This study examined estimates of finger vascular tone, obtained from photoplethysmography. Normalized and double‐normalized pulse volume (NPV and DNPV), blood volume (BV), and pulse volume (PV) were obtained in 2 male and 7 female middle‐aged patients at an outpatient office 1–3 days before an operation and in the operating room before and after anesthesia by propofol. There was a preoperative decrease in NPV, and the propofol injection yielded a…
A preliminary study of the comfort of paced respiration
In order to obtain basal information about what type of externally paced respiration is comfortable, 25 male and 25 female undergraduate students were asked to practice self‐paced respiration. After a 1‐min rehearsal following instructions on comfortable self‐paced respiration, subjects carried out 2 min of self‐paced respiration and rated their level of comfort on a scale of 1–5. This was repeated (up to a maximum of seven times) until the subje…
Intertask consistency of blood pressure responses to laboratory stressors may increase with prolonged exposure
In this study, one of the predictions of the reactivity hypothesis was investigated: the intertask consistency of blood pressure (BP) responses. Twelve young male subjects underwent cold‐pressor (14°C) and digit‐scan (counting even numbers) tests in randomized order. Cardiovascular parameters were recorded during a 2‐min pretask baseline, a 10‐min stressful exposure, and over a 5‐min post‐task baseline. The intertask correlations between the cold…
Application of the maximum‐entropy method to data on short‐term variability in inter‐beat interval and an interpretation of the calculated powers
Sixteen young males underwent resting and mental arithmetic and were injected with 100 μg phenylephrine during the interventions. Half of them further underwent trinitroglycerine injections. Power spectral density for inter‐beat interval variability was calculated using the maximum‐entropy method (MEM) with a very high lag, and its validity was checked by nonlinear least‐squares method. It was found that the MEM could produce a very accurate powe…
A preliminary study of beat-to-beat blood pressure biofeedback using the vascular unloading method
Eight male normotensive, undergraduate students participated as subjects in blood pressure (BP) biofeedback training of two, 12-min periods. BP was measured continuously using the vascular unloading method (Yamakoshi, Shimazu, & Togawa, 1980), and the BP information was fed back to the subject on a beat-to-beat basis. They were trained to control either their systolic or diastolic BP in both upper and lower directions. Training was successful in …
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A preliminary study of beat-to-beat blood pressure biofeedback using the vascular unloading method
Eight male normotensive, undergraduate students participated as subjects in blood pressure (BP) biofeedback training of two, 12-min periods. BP was measured continuously using the vascular unloading method (Yamakoshi, Shimazu, & Togawa, 1980), and the BP information was fed back to the subject on a beat-to-beat basis. They were trained to control either their systolic or diastolic BP in both upper and lower directions. Training was successful in …
Application of the maximum‐entropy method to data on short‐term variability in inter‐beat interval and an interpretation of the calculated powers
Sixteen young males underwent resting and mental arithmetic and were injected with 100 μg phenylephrine during the interventions. Half of them further underwent trinitroglycerine injections. Power spectral density for inter‐beat interval variability was calculated using the maximum‐entropy method (MEM) with a very high lag, and its validity was checked by nonlinear least‐squares method. It was found that the MEM could produce a very accurate powe…
Intertask consistency of blood pressure responses to laboratory stressors may increase with prolonged exposure
In this study, one of the predictions of the reactivity hypothesis was investigated: the intertask consistency of blood pressure (BP) responses. Twelve young male subjects underwent cold‐pressor (14°C) and digit‐scan (counting even numbers) tests in randomized order. Cardiovascular parameters were recorded during a 2‐min pretask baseline, a 10‐min stressful exposure, and over a 5‐min post‐task baseline. The intertask correlations between the cold…
A preliminary study of the comfort of paced respiration
In order to obtain basal information about what type of externally paced respiration is comfortable, 25 male and 25 female undergraduate students were asked to practice self‐paced respiration. After a 1‐min rehearsal following instructions on comfortable self‐paced respiration, subjects carried out 2 min of self‐paced respiration and rated their level of comfort on a scale of 1–5. This was repeated (up to a maximum of seven times) until the subje…
Evaluation of pre‐operative anxiety and propofol‐induced sedation using newly proposed indices of finger vascular tone
This study examined estimates of finger vascular tone, obtained from photoplethysmography. Normalized and double‐normalized pulse volume (NPV and DNPV), blood volume (BV), and pulse volume (PV) were obtained in 2 male and 7 female middle‐aged patients at an outpatient office 1–3 days before an operation and in the operating room before and after anesthesia by propofol. There was a preoperative decrease in NPV, and the propofol injection yielded a…
Normalized pulse volume and blood volume as separate indices of finger arterial and venous vascular tone
This study examined the newly proposed indices for estimating finger vascular tone, which can be obtained from near infrared transmittance photoplethysmographic recordings; normalized pulse volume (NPV) and blood volume (BV). They were recorded for seven male and two female students under continuous infusion of and recovery from propofol. Concomitant hemodynamic measurements were made with a non‐invasive impedance cardiograph and a continuous blo…
Blood pressure and heart rate responses to an intrusion on personal space
Yaezawa and Yoshida's (1981 ) findings on the effects of an intrusion on personal space were reinvestigated. Thirty‐five female students were confronted with the approach of a male stranger, and blood pressure (BP) and heart rate (HR) were monitored. Throughout the model's approach, HR showed a significant triphasic change (an initial decrease, a subsequent increase, and then a secondary decrease), whereas subjective feelings of anxiety and tensi…
Attention‐Affect Check List
Given a hint from Lang, Bradley, and Cutbert's (1997 ) defense cascade, two cognitive processes, instead of passive versus active behavioral coping, which seem to have differential effects on the provocation of vascular‐ versus cardiac‐dominant reaction pattern during mental stress were advocated: attention ( Attent ) versus unpleasant affect ( UnplAff ). Based on this notion the Attention‐Affect Check List (AACL) was developed as a self‐report m…
Balance of blood pressure equivalents as a new quantitative scale for identifying cardiac versus vascular reactor
A quantitative scale for identifying cardiac versus vascular reactor, balance of blood pressure equivalents ( BE ), was newly advocated and compared with a very recently advocated one, hemodynamic profile ( HP ), by Gregg, Matyas and James (2002). BE was defined as “ (Δ Q/Q 0 ) P 0 ′ − ( Δ R/R 0 )P 0 .” Here, P 0 , Q 0 , and R 0 were mean blood pressure ( P ), cardiac output ( Q ), and total peripheral resistance ( R ) during baseline, and Δ Q an…
Mean recovery rate
Assessment of recovery is important for the investigation of stress but has been compounded by difficulties, in particular contamination by the carryover effect. In the present study, the mean recovery rate ( MRR ) was used in order to overcome this difficulty. First, the validity of the MRR was demonstrated theoretically. Second, it was demonstrated experimentally, when a comparison was made with the validity of the mean recovery per se. In the …
The association between chronic psychosocial stress, allostatic load, and vascular health in asymptomatic young men
A novel index of finger arterial stiffness (FSI) was tested in terms of the relationship with risk markers for preclinical cardiovascular disease. In addition, we examined if the association between psychosocial factors and FSI was explained by allostatic load markers in 37 healthy young men aged 24.8 ± 4.0 years. The FSI was devised based on an exponential model of the finger arterial pressure‐volume relationship. The allostatic load index (ALI)…
Assessment of Construct Validity of Recovery Measures through Theoretical Formulations as Applied to Cardiovascular Parameters
The recovery period is generally excluded under stress testing, despite its importance, because recovery measures lack information on construct validity. The smaller the carryover effect, the higher the construct validity. Theoretical formulae were derived for three recovery measures (i.e., total carryover [TCO], mean recovery rate [MRR], and area under the curve [AUC]) to assess to what extent this criterion is fulfilled. The cardiovascular para…
Medicine (11 works) · Blood pressure (10 works) · Internal Medicine (10 works) · Internal Medicine (10 works) · Heart Rate Variability and Autonomic Control (9 works) · Heart rate (7 works) · Psychology (7 works) · Cardiology (6 works) · Mathematics (5 works) · Anesthesia (4 works)