Circadian Variation of Blood-Pressure

Millar-Craig, M W; Bishop, CharlesN; Raftery, Edward B.

doi:10.1016/s0140-6736(78)92998-7

Cited by 1,183 publications

(478 citation statements)

References 23 publications

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“…3,[7][8][9] Ambulatory monitoring of blood pressure (AMBP), using either invasive or noninvasive recorders, has shown that BP tends to be higher during the day and lower at night in normotensive subjects. [10][11][12][13][14] In particular, some hypertensive patients do not exhibit the normal nocturnal BP fall, and they have been called 'non-dippers', whereas those with normal circadian rhythm have been called 'dippers'. [15][16][17][18] Moreover, studies that used AMBP showed that the reduction in night time BP seems to lower in secondary forms of hypertension.…”

Section: Introductionmentioning

confidence: 99%

Ambulatory monitoring of blood pressure (AMBP) in patients with primary hyperparathyroidism

et al. 2005

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The purpose of our study was to evaluate the behaviour of blood pressure (BP) by ambulatory monitoring of blood pressure (AMBP) in 53 patients with primary hyperparathyroidism (PHPT) compared to 100 essential hypertensive (EH) and 31 healthy subjects (HS). The correlations between calcium-phosphorus metabolism and haemodynamic parameters in all groups are included in the study. AMBP was performed using the oscillometric technique (Space-Labs, 90207, Redmond, WA, USA) and the following AMBP parameters were evaluated: average day time systolic (S) and diastolic (D) blood pressure (BP) and heart rate (HR) (when awake), average night time SBP, DBP and HR (when asleep) and average 24-h-SBP, DBP and HR. The definition of 'dipper' or 'non-dipper' subjects was established if night time SBP and DBP fall was 410% and o10%, respectively. In total, 25 PHPT patients (47.2%) were hypertensive (HT-PHPT) and 28 PHPT (52.8%) were normotensive (NT-PHPT). Mean 24-h-SBP and DBP obtained by AMBP was higher in HT-PHPT (Po0.05) and EH (Po0.05) than in NT-PHPT and HS. The multiple linear regression has shown that in PHPT-HT patients ionized calcium is an independent factor for the rise of 24-h-DBP values (r: 0.497; Po0.05) and daytime DBP values (r: 0.497; Po0.05). In 56% of HT-PHPT patients there is an absence of physiological BP nocturnal fall ('non-dipper'), which is statistically significant (Po0.05) compared with 'nondipper' EH patients (30%). In conclusion, in our study the prevalence of hypertension in PHPT was 47%. AMBP revealed that the 'non-dipping 'pattern was much higher in HT-PHPT patients in respect to EH patients.

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Section: Introductionmentioning

confidence: 99%

Ambulatory monitoring of blood pressure (AMBP) in patients with primary hyperparathyroidism

et al. 2005

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“…Regarding safety, circadian variation is observed in adverse cardiovascular events such as stroke and myocardial infarction, which occur mostly in the morning 45,46) . The major underlying pathophysiology of these events is considered to be "the morning surge in blood pressure", inducing rupture of fragile atherosclerotic plaque and leading to cardiovascular or cerebrovascular thrombosis 47,48) . In the morning under free-living conditions, blood pressure increases on wake-up stress consisting of postural change associated with rising, beginning ambulation, and increased sympathetic activity 49) .…”

Section: A Variety Of Human Circadian Rhythms and Characteristicsmentioning

confidence: 99%

Human circadian rhythms and exercise: Significance and application in real-life situations

Mizuno

2014

JPFSM

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This review introduces a variety of human circadian rhythms including physiological processes and mental and physical performances, with reference to real-life situations. Circadian rhythms play a role in physiological processes, such as core body temperature and plasma melatonin, which are recognized as the body clock. As humans are diurnal organisms, mental performance declines primarily at night, secondarily in the early afternoon; this is consistent with risks of traffic and industrial accidents. Physical performance is composed of various fitness components and generally reaches its peak and nadir at around evening and early morning, respectively. Exceptions to this are body balance control and accuracy, both of which require brain function. Although maximal oxygen consumption (V ・ O 2 max) measured in the laboratory shows a constant value independent of the time of day, actual endurance capacity might be determined by core body temperature at the beginning of exercise, thermoregulatory response, and environmental temperature and humidity, all of which vary with the time of day. As the most powerful factor affecting the human circadian clock is bright light, physical exercise may be one factor entraining the human circadian pacemaker. However, experimental evidence has suggested that exercise itself has little or no influence on shifting the human master clock. Although further studies are required, recent studies have demonstrated that physical exercise at a certain time of day specifically improves physical performance at the same time, which might be independent of the master clock.

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“…This risk roughly doubled if the perfusion pressure was between 30 and 49 mmHg, and it increased more than 6-fold if the perfusion pressure fell below 30 mmHg. As both IOP and blood pressure show circadian variations, this ocular perfusion pressure can fluctuate during a 24-hour period (Bagga, 2009) (Millar-Craig, 1978. The night-time period, when there is an increase in IOP perfusion of the optic nerve head, may be a particularly vulnerable time for decreases in blood pressure.…”

Section: Altered Blood Flow As a Risk Factor For Glaucoma (Progression)mentioning

confidence: 99%

A Vascular Approach to Glaucoma

Pinto¹,

Stalmans²

2011

Glaucoma - Basic and Clinical Concepts

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Circadian Variation of Blood-Pressure

Cited by 1,183 publications

References 23 publications

Ambulatory monitoring of blood pressure (AMBP) in patients with primary hyperparathyroidism

Ambulatory monitoring of blood pressure (AMBP) in patients with primary hyperparathyroidism

Human circadian rhythms and exercise: Significance and application in real-life situations

A Vascular Approach to Glaucoma

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