Response of capacity vessels in human limbs to head-up tilt and suction on lower body.

Samueloff, SL; Browse, N. L.; Shepherd, John T.

doi:10.1152/jappl.1966.21.1.47

Cited by 52 publications

(15 citation statements)

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“…Gauer and Thron (110) thought that venoconstriction was not significant during orthostasis. Samueloff et al (289) have shown only a weak and transient constriction of cutaneous veins at t he onset of LBNP at -60 mmHg. However, passive changes in venous volume caused by the splanchnic and peripheral vasoconstriction are probably significant (48,70,354).…”

Section: Dynamic Responses To Posture Changesmentioning

confidence: 96%

Cardiovascular Adjustments to Gravitational Stress

Blomqvist

Stone

1983

Comprehensive Physiology

191

163

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Section: Dynamic Responses To Posture Changesmentioning

confidence: 96%

Cardiovascular Adjustments to Gravitational Stress

Blomqvist

Stone

1983

Comprehensive Physiology

191

163

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“…(b) The baroreceptors were inhibited by the application of lower body negative pressure. This was accomplished by placing the lower part of the body from the level of the iliac crests into an airtight box (5,6,22,23) and decreasing pressure within it to 60 mm of Hg below ambient atmospheric pressure. This level of negative pressure was achieved within 30 sec.…”

Section: Methodsmentioning

confidence: 99%

The role of skin and muscle resistance vessels in reflexes mediated by the baroreceptor system

Gd¹,

Zelis²,

Se³

et al. 1970

J. Clin. Invest.

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A B S T R A C T The role of skin and muscle vascular beds in baroreceptor-mediated alterations of peripheral vascular resistance was evaluated in six normal s jects in whom the skin circulation in one forearm was temporarily suppressed by epinephrine iontophoris. Baroreceptor activity was enhanced by application of negative pressure to the neck (neck suction) and inhibited by application of lower body negative pressure. Forearm blood flow was measured simultaneously in both arms with strain gauge plethysmographs. Since blood flow in the treated arm consisted entirely of muscle flow, skin flow was calculated from the difference between total forearm flow in the intact arm and muscle flow in the treated arm. Vascular resistances were calculated as the ratio of mean arterial pressure to the blood flow of each vascular bed. During neck suction, mean arterial pressure decreased from an average of 89 to 75 mm of Hg (P < 0.005), heart rate decreased from an average of 60 to 55 beats/min (P < 0.005), and total skin and muscle flows remained essentially unchanged. Cutaneous vascular resistance decreased from an average of 75 to 49 mm of Hg/ml per 100 g per min (P < 0.05), muscle vascular resistance from 68 to 51 (P < 0.005), and total forearm vascular resistance from 36 to 24 (P < 0.025). During lower body negative pressure,, heart rate increased from an average of 59 to 69 beats/min (P < 0.005), mean arterial pressure did not change significantly, and significant decreases occurred in forearm blood flow from 5.4 to 2.7 ml/100 g per min, in skin blood flow from 3.1 to 1.4, and in muscle blood flow from 2.3 to 1.3. Cutaneous vascular resistance increased from an average of 47 to 110 mm of Hg/ml per 100 g per min (P < 0.05), muscle vascular resistance from 43 to 72 (P <0.005), and total forearm vascular resistance from 20 to 38 (P <0.001). These results demonstrate

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“…This is in contrast to the reduction in blood flow which is more sustained, though the trend of change may be in the same direction. The volume change appears to be related to the transient increase in venous tone which occurs with lower body suction (iliac crests) or with tilting to the upright position (Samueloff, Browse & Shepherd, 1966), rather than to the sustained fall in perfusion. This pattern is not always observed but has been seen in four subjects.…”

Section: Resultsmentioning

confidence: 99%

Observation of changes in volume of a congested limb as a means of studying the behaviour of capacity vessels

Ardill¹,

Bhatnagar²,

Fentem³

1968

The Journal of Physiology

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SUMMARY1. Experiments have been performed to determine whether the volume of a forearm congested by a cuff inflated to a low pressure (15-30 mm Hg) reflects active changes in the vascular capacity of the part while remaining relatively insensitive to the passive effects of changes in perfusion.2. Conditions were chosen in which existing evidence suggests that blood flow and capacity vary independently of each other.3. The results of these experiments suggested that active changes in capacity can be studied by the continuous observation of the volume of a congested limb, provided that the associated change in blood flow is a reduction from the basal level and is not an increase above the basal level.

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Response of capacity vessels in human limbs to head-up tilt and suction on lower body.

Cited by 52 publications

References 0 publications

Cardiovascular Adjustments to Gravitational Stress

Cardiovascular Adjustments to Gravitational Stress

The role of skin and muscle resistance vessels in reflexes mediated by the baroreceptor system

Observation of changes in volume of a congested limb as a means of studying the behaviour of capacity vessels

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