Effect of Rajayoga Meditation on Blood Pressure, Heart Rate, Cardiac Output, Cardiac Index, Peripheral Blood Flow (Right Upper Limb & Lower Limb)

In dogs peripheral blood flow and blood pressure were not significantly altered during a period of 2 hours following the administration of Flaxedil. Heart rate increased significantly. Rectal temperature, hematocrit, O2 consumption and CO2 production were not altered. The changes in peripheral blood flow and heart rate which occur following an anesthetic dose of pentobarbital sodium were not influenced by the administration of combinations of pentobarbital and Flaxedil. Flaxedil appears to be a desirable agent to employ for controlling the muscular activity in experiments concerned with the measure of peripheral blood flow and blood pressure since this drug per se has little or no effect on these variables and thus would permit establishment of their control values. The use of this drug alone would not be permissible in painful experimental procedures.

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Improved cardiac output and peripheral blood flow after correcting neonatal hyperviscosity

American Heart Journal ◽

10.1016/0002-8703(85)90126-7 ◽

1985 ◽

Vol 110 (3) ◽

pp. 707

Author(s):

Sydney Swetnam ◽

Dale Alverson ◽

Steven M. Yabek ◽

Pam Angelus ◽

Connie Bakstrom ◽

...

Keyword(s):

Blood Flow ◽

Cardiac Output ◽

Peripheral Blood ◽

Peripheral Blood Flow

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Cardiac Output Changes in Newborns With Hyperbilirubinemia Treated With Phototherapy

PEDIATRICS ◽

10.1542/peds.76.6.918 ◽

1985 ◽

Vol 76 (6) ◽

pp. 918-921

Author(s):

Frans J. Walther ◽

Paul Y. K. Wu ◽

Bijan Siassi

Keyword(s):

Blood Flow ◽

Cardiac Output ◽

Stroke Volume ◽

Skin Blood Flow ◽

Peripheral Blood ◽

Cardiovascular Effects ◽

Tissue Perfusion ◽

Peripheral Blood Flow ◽

Limb Blood Flow ◽

Term Infants

Phototherapy is known to increase peripheral blood flow in neonates, but information on the associated cardiovascular effects is not available. Using pulsed Doppler echocardiography we evaluated cardiac output and stroke volume in 12 preterm and 13 term neonates during and after phototherapy. We concomitantly measured arterial limb blood flow by strain gauge plethysmography and skin blood flow by photoplethysmography. Cardiac output decreased by 6% due to reduced stroke volume during phototherapy, whereas total limb blood flow and skin blood flow increased by 38% and 41%, respectively. Peripheral blood flow increments tended to be higher in the preterm than in the term infants. The reduced stroke volume during phototherapy may be an expression of reduced activity of the newborn during phototherapy. For healthy neonates the reduction in cardiac output is minimal, but for sick infants with reduced cardiac output, this reduction may further aggravate the decrease in tissue perfusion.

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Temperature Biofeedback Training to Improve Peripheral Blood Flow in the Upper Extremities of Diabetic Patients

Canadian Journal of Occupational Therapy ◽

10.1177/000841748405100501 ◽

1984 ◽

Vol 51 (5) ◽

pp. 219-224 ◽

Cited By ~ 1

Author(s):

Elizabeth Dean

Keyword(s):

Blood Pressure ◽

Blood Flow ◽

Diastolic Blood Pressure ◽

Peripheral Blood ◽

Diabetic Group ◽

Biofeedback Training ◽

Control Group ◽

Diabetic Patients ◽

Peripheral Blood Flow ◽

Temperature Biofeedback

Ten control and ten diabetic subjects were first given a baseline session of no temperature biofeedback, and then were exposed to four 40-minute temperature biofeedback sessions over consecutive days. As the result of feedback training, peripheral skin temperatures increased on the training (right) hands of both groups, and this occurred to a greater extent in the diabetic group. Concomitant temperature increases occurred also in the left hands of both groups. Neither group produced any significant changes in heart rate, respiration rate, or systolic blood pressure with the exception of a significant decrease in diastolic blood pressure for the diabetic group. No difference in diastolic blood pressure was observed, however, when the diabetics were compared with the control group. The results would suggest further evaluation of temperature biofeedback training is warranted in a diabetic population as a potential means of increasing peripheral blood flow in the extremities.

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EFFECTS OF ANGIOTENSIN, VASOPRESSIN AND METHOXAMINE ON CARDIAC OUTPUT, LEFT VENTRICULAR DYNAMICS AND PERIPHERAL BLOOD FLOW DISTRIBUTION IN CONSCIOUS DOGS

Abstracts ◽

10.1016/b978-0-08-021308-8.51075-9 ◽

1977 ◽

pp. 446

Author(s):

Guy Heyndrickx ◽

Dedo Boettcher ◽

Robert McRitchie ◽

Stephen Vatner

Keyword(s):

Blood Flow ◽

Cardiac Output ◽

Peripheral Blood ◽

Flow Distribution ◽

Left Ventricular ◽

Conscious Dogs ◽

Peripheral Blood Flow ◽

Blood Flow Distribution ◽

Ventricular Dynamics

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The Relationship between Cardiac Output, Cerebral Electrical Activity, Cerebral Fractional Oxygen Extraction and Peripheral Blood Flow in Premature Newborn Infants

Pediatric Research ◽

10.1203/01.pdr.0000238379.67720.19 ◽

2006 ◽

Vol 60 (4) ◽

pp. 456-460 ◽

Cited By ~ 39

Author(s):

Suresh Victor ◽

Richard E Appleton ◽

Margaret Beirne ◽

Anthony G Marson ◽

A Michael Weindling

Keyword(s):

Blood Flow ◽

Cardiac Output ◽

Electrical Activity ◽

Peripheral Blood ◽

Newborn Infants ◽

Oxygen Extraction ◽

Peripheral Blood Flow ◽

Premature Newborn ◽

The Relationship

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The underwater environment: cardiopulmonary, thermal, and energetic demands

Journal of Applied Physiology ◽

10.1152/japplphysiol.90984.2008 ◽

2009 ◽

Vol 106 (1) ◽

pp. 276-283 ◽

Cited By ~ 74

Author(s):

D. R. Pendergast ◽

C. E. G. Lundgren

Keyword(s):

Blood Pressure ◽

Blood Flow ◽

Cardiac Output ◽

Stroke Volume ◽

Time Dependent ◽

Breath Holding ◽

Peripheral Blood Flow ◽

Short Term ◽

Underwater Environment ◽

Maximal Cardiac Output

Water covers over 75% of the earth, has a wide variety of depths and temperatures, and holds a great deal of the earth's resources. The challenges of the underwater environment are underappreciated and more short term compared with those of space travel. Immersion in water alters the cardio-endocrine-renal axis as there is an immediate translocation of blood to the heart and a slower autotransfusion of fluid from the cells to the vascular compartment. Both of these changes result in an increase in stroke volume and cardiac output. The stretch of the atrium and transient increase in blood pressure cause both endocrine and autonomic changes, which in the short term return plasma volume to control levels and decrease total peripheral resistance and thus regulate blood pressure. The reduced sympathetic nerve activity has effects on arteriolar resistance, resulting in hyperperfusion of some tissues, which for specific tissues is time dependent. The increased central blood volume results in increased pulmonary artery pressure and a decline in vital capacity. The effect of increased hydrostatic pressure due to the depth of submersion does not affect stroke volume; however, a bradycardia results in decreased cardiac output, which is further reduced during breath holding. Hydrostatic compression, however, leads to elastic loading of the chest wall and negative pressure breathing. The depth-dependent increased work of breathing leads to augmented respiratory muscle blood flow. The blood flow is increased to all lung zones with some improvement in the ventilation-perfusion relationship. The cardiac-renal responses are time dependent; however, the increased stroke volume and cardiac output are, during head-out immersion, sustained for at least hours. Changes in water temperature do not affect resting cardiac output; however, maximal cardiac output is reduced, as is peripheral blood flow, which results in reduced maximal exercise performance. In the cold, maximal cardiac output is reduced and skin and muscle are vasoconstricted, resulting in a further reduction in exercise capacity.

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Increased cardiac output and microvascular blood flow during mild hemoconcentration in hamster window model

AJP Heart and Circulatory Physiology ◽

10.1152/ajpheart.01218.2005 ◽

2006 ◽

Vol 291 (1) ◽

pp. H310-H317 ◽

Cited By ~ 19

Author(s):

Judith Martini ◽

Amy G. Tsai ◽

Pedro Cabrales ◽

Paul C. Johnson ◽

Marcos Intaglietta

Keyword(s):

Blood Pressure ◽

Blood Flow ◽

Shear Stress ◽

Cardiac Output ◽

Cardiac Index ◽

Systemic Blood Pressure ◽

Second Order ◽

Microvascular Blood Flow ◽

Packed Red Blood Cells ◽

Order Polynomial

The effect of small hematocrit (Hct) increases on cardiac index (cardiac output/body wt) and oxygen release to the microcirculation was investigated in the awake hamster window chamber model by means of exchange transfusions of homologous packed red blood cells. Increasing Hct between 8 and 13% from baseline increased cardiac index by 5–31% from baseline ( P < 0.05) and significantly lowered systemic blood pressure ( P < 0.05). The relationship between Hct and cardiac index is described by a second-order polynomial ( R2 = 0.84; P < 0.05) showing that Hct increases up to 20% from baseline increase cardiac index, whereas increases over 20% from baseline decrease cardiac index. Combining this data with measurements of blood pressure allowed to determine total peripheral vascular resistance, which was a minimum at 8–13% Hct increase and was described by a second-order polynomial ( R2 = 0.83; P < 0.05). Oxygen measurements in arterioles, venules, and the tissue at 8–13% Hct increase were identical to control; thus, as a consequence of increased flow and oxygen-carrying capacity, oxygen delivery and extraction increased, but the change was not statistically significant. Previous results with the same model showed that the observed effects are related to shear stress-mediated release of nitric oxide, an effect that should be also present in the heart microcirculation, leading to increased blood flow, myocardial oxygen consumption, and contractility. We conclude that a minimum viscosity level is necessary for generating the shear stress required for maintaining normal cardiovascular function.

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Effects of apnea and facial submersion on heart rate and peripheral blood flow in humans

The FASEB Journal ◽

10.1096/fasebj.21.6.a1400-b ◽

2007 ◽

Vol 21 (6) ◽

Author(s):

Stuart K. Ware ◽

Kenneth Hensley ◽

Johnny Napier ◽

Edward Trent

Keyword(s):

Heart Rate ◽

Blood Flow ◽

Peripheral Blood ◽

Peripheral Blood Flow

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Nocturnal variations in peripheral blood flow, systemic blood pressure, and heart rate in humans

AJP Heart and Circulatory Physiology ◽

10.1152/ajpheart.1991.261.4.h982 ◽

1991 ◽

Vol 261 (4) ◽

pp. H982-H988

Author(s):

J. H. Sindrup ◽

J. Kastrup ◽

H. Christensen ◽

B. Jorgensen

Keyword(s):

Blood Pressure ◽

Heart Rate ◽

Blood Flow ◽

Arterial Blood Pressure ◽

Flow Rate ◽

Mean Arterial Blood Pressure ◽

Blood Flow Rate ◽

Tissue Blood Flow ◽

Peripheral Blood Flow ◽

Arterial Blood

Subcutaneous adipose tissue blood flow rate, together with systemic arterial blood pressure and heart rate under ambulatory conditions, was measured in the lower legs of 15 normal human subjects for 12-20 h. The 133Xe-washout technique, portable CdTe(Cl) detectors, and a portable data storage unit were used for measurement of blood flow rates. An automatic portable blood pressure recorder and processor unit was used for measurement of systolic blood pressure, diastolic blood pressure, and heart rate every 15 min. The change from upright to supine position at the beginning of the night period was associated with a 30-40% increase in blood flow rate and a highly significant decrease in mean arterial blood pressure and heart rate (P less than 0.001 for all). Approximately 100 min after the subjects went to sleep an additional blood flow rate increment (mean 56%) and a simultaneous significant decrease in mean arterial blood pressure (P less than 0.001) were observed. The duration of this hyperemic phase was 116 min. A highly significant reduction of the subcutaneous vascular resistance (50%) was demonstrated during the hyperemic blood flow rate phase compared with the surrounding phases (P less than 0.0001). The synchronism of the nocturnal subcutaneous hyperemia and the decrease in systemic mean arterial blood pressure point to a common, possibly central nervous or humoral, eliciting mechanism.

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