scholarly journals Radial Pressure Pulse and Heart Rate Variability in Heat- and Cold-Stressed Humans

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
Chin-Ming Huang ◽  
Hsien-Cheh Chang ◽  
Shung-Te Kao ◽  
Tsai-Chung Li ◽  
Ching-Chuan Wei ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Cold Stress ◽  
Thermal Stresses ◽  
Pressure Pulse ◽  
Radial Pressure ◽  
Cold Test ◽  
Spectral Energy ◽  
Arterial Blood ◽  
Heat And Cold Stress

This study aims to explore the effects of heat and cold stress on the radial pressure pulse (RPP) and heart rate variability (HRV). The subjects immersed their left hand into 45°C and 7°C water for 2 minutes. Sixty healthy subjects (age25±4 yr; 29 men and 31 women) were enrolled in this study. All subjects underwent the supine temperature measurements of the bilateral forearms, brachial arterial blood pressure, HRV and RPP with a pulse analyzer in normothermic conditions, and thermal stresses. The power spectral low-frequency (LF) and high-frequency (HF) components of HRV decreased in the heat test and increased in the cold test. The heat stress significantly reduced radial augmentation index (AIr) (P<.05), but the cold stress significantly increased AIr (P<.01). The spectral energy of RPP did not show any statistical difference in0∼10 Hz region under both conditions, but in the region of10∼50 Hz, there was a significant increase (P<.01) in the heat test and a significant decrease in the cold test (P<.01). The changes in AIr induced by heat and cold stress were significantly negatively correlated with the spectral energy in the region of10∼50 Hz (SE10−50 Hz) but not in the region of0∼10 Hz (SE0−10 Hz). The results demonstrated that the SE10−50 Hz, which only possessed a small percentage in total pulse energy, presented more physiological characteristics than the SE0−10 Hzunder the thermal stresses.

Radial Pressure Pulse and Heart Rate Variability in Normotensive and Hypertensive Subjects

2011 ◽  
Vol 17 (10) ◽  
pp. 945-952 ◽  
Author(s):  
Chin-Ming Huang ◽  
Hsien-Cheh Chang ◽  
Shung-Te Kao ◽  
Tsai-Chung Li ◽  
Ching-Chuan Wei ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Pressure Pulse ◽  
Radial Pressure

Comparative study on effect of neutral spinal bath and neutral spinal spray on blood pressure, heart rate and heart rate variability in healthy volunteers

2018 ◽  
Vol 16 (2) ◽  
Author(s):  
Arundhati Goley ◽  
A. Mooventhan ◽  
NK. Manjunath
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Heart Rate Variability ◽  
Healthy Volunteers ◽  
Group Analysis ◽  
Low Frequency ◽  
Single Session ◽  
Arterial Blood ◽  
Before And After ◽  
Instantaneous Heart Rate

Abstract Background Hydrotherapeutic applications to the head and spine have shown to improve cardiovascular and autonomic functions. There is lack of study reporting the effect of either neutral spinal bath (NSB) or neutral spinal spray (NSS). Hence, the present study was conducted to evaluate and compare the effects of both NSB and NSS in healthy volunteers. Methods Thirty healthy subjects were recruited and randomized into either neutral spinal bath group (NSBG) or neutral spinal spray group (NSSG). A single session of NSB, NSS was given for 15 min to the NSBG and NSSG, respectively. Assessments were taken before and after the interventions. Results Results of this study showed a significant reduction in low-frequency (LF) to high-frequency (HF) (LF/HF) ratio of heart rate variability (HRV) spectrum in NSBG compared with NSSG (p=0.026). Within-group analysis of both NSBG and NSSG showed a significant increase in the mean of the intervals between adjacent QRS complexes or the instantaneous heart rate (HR) (RRI) (p=0.002; p=0.009, respectively), along with a significant reduction in HR (p=0.002; p=0.004, respectively). But, a significant reduction in systolic blood pressure (SBP) (p=0.037) and pulse pressure (PP) (p=0.017) was observed in NSSG, while a significant reduction in diastolic blood pressure (DBP) (p=0.008), mean arterial blood pressure (MAP) (p=0.008) and LF/HF ratio (p=0.041) was observed in NSBG. Conclusion Results of the study suggest that 15 min of both NSB and NSS might be effective in reducing HR and improving HRV. However, NSS is particularly effective in reducing SBP and PP, while NSB is particularly effective in reducing DBP and MAP along with improving sympathovagal balance in healthy volunteers.

Biphasic changes in fetal heart rate variability in preterm fetal sheep developing hypotension after acute on chronic lipopolysaccharide exposure

2014 ◽  
Vol 307 (4) ◽  
pp. R387-R395 ◽  
Author(s):  
Christopher A. Lear ◽  
Joanne O. Davidson ◽  
Lindsea C. Booth ◽  
Guido Wassink ◽  
Robert Galinsky ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Fetal Heart Rate ◽  
Low Dose ◽  
Fetal Heart ◽  
Transient Increase ◽  
Electromyographic Activity ◽  
Fetal Sheep ◽  
Arterial Blood ◽  
Fetal Heart Rate Variability

Perinatal exposure to infection is highly associated with adverse outcomes. Experimentally, acute, severe exposure to gram-negative bacterial lipopolysaccharide (LPS) is associated with increased fetal heart rate variability (FHRV). It is unknown whether FHRV is affected by subclinical infection with or without acute exacerbations. We therefore tested the hypothesis that FHRV would be associated with hypotension after acute on chronic exposure to LPS. Chronically instrumented fetal sheep at 0.7 gestation were exposed to a continuous low-dose LPS infusion ( n = 12, 100 ng/kg over 24 h, followed by 250 ng·kg−1·24 h−1 for a further 96 h) or the same volume of saline ( n = 10). Boluses of either 1 μg LPS or saline were given at 48, 72, and 96 h. Low-dose infusion was not associated with hemodynamic or FHRV changes. The first LPS bolus was associated with tachycardia and suppression of nuchal electromyographic activity in all fetuses. Seven of twelve fetuses developed hypotension (a fall in mean arterial blood pressure ≥5 mmHg). FHRV was transiently increased only at the onset of hypotension, in association with increased cytokine induction and electroencephalogram suppression. FHRV then fell before the nadir of hypotension, with transient suppression of short-term FHRV. After the second LPS bolus, the hypotension group showed a biphasic pattern of a transient increase in FHRV followed by more prolonged suppression. These findings suggest that infection-related hypotension in the preterm fetus mediates the transient increase in FHRV and that repeated exposure to LPS leads to progressive loss of FHRV.

Persistent alterations in heart rate variability, baroreflex sensitivity, and anxiety-like behaviors during development of heart failure in the rat

2008 ◽  
Vol 295 (1) ◽  
pp. H29-H38 ◽  
Author(s):  
Marcus Henze ◽  
Davin Hart ◽  
Allen Samarel ◽  
John Barakat ◽  
Laurie Eckert ◽  
...  
Keyword(s):  
Heart Failure ◽  
Heart Rate ◽  
Heart Rate Variability ◽  
Baroreflex Sensitivity ◽  
Elevated Plus Maze ◽  
Low Frequency ◽  
Coronary Artery Ligation ◽  
Artery Ligation ◽  
Arterial Blood ◽  
Plus Maze

Depressed heart rate variability and mood are associated with increased mortality in patients with congestive heart failure (CHF). Here autonomic indexes were assessed 3 and 7 wk after left coronary artery ligation in telemetered rats, after which anxiety-like behaviors were assessed in an elevated plus maze. Low frequency (LF) and high frequency (HF) heart rate variability were reduced in CHF rats 3 wk after infarction (LF, 1.60 ± 0.52 vs. 6.97 ± 0.79 ms2; and HF, 1.53 ± 0.39 vs. 6.20 ± 1.01 ms2; P < 0.01). The number of sequences of interbeat intervals that correlated with arterial pressure was decreased in CHF rats at 3 and 7 wk ( week 3, 26.60 ± 10.85 vs. 59.75 ± 11.4 sequences, P < 0.05; and week 7, 20.80 ± 8.97 vs. 65.38 ± 5.89 sequences, P < 0.01). Sequence gain was attenuated in CHF rats by 7 wk (1.34 ± 0.06 vs. 2.70 ± 0.29 ms/mmHg, P < 0.01). Coherence between interbeat interval and mean arterial blood pressure variability in the LF domain was reduced in CHF rats at 3 (0.12 ± 0.03 vs. 0.26 ± 0.05 k2, P < 0.05) and 7 (0.16 ± 0.02 vs. 0.31 ± 0.05 k2, P < 0.05) wk. CHF rats invariably entered the open arm of the elevated plus maze first and spent more time in the open arms (36.0 ± 15% vs. 4.6 ± 1.9%, P < 0.05). CHF rats also showed a tendency to jump head first off the apparatus, whereas controls did not. Together the data indicate that severe autonomic dysfunction is accompanied by escape-seeking behaviors in rats with verified CHF.

ARTERIAL BLOOD PRESSURE AND HEART RATE VARIABILITY IN PERSONS AFTER SMOKING CESSATION

2011 ◽  
Vol 29 ◽  
pp. e167
Author(s):  
M. Poreba ◽  
R. Poreba ◽  
P. Gac ◽  
W. Pilecki ◽  
M. Sobieszczanska
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Smoking Cessation ◽  
Heart Rate Variability ◽  
Arterial Blood Pressure ◽  
Arterial Blood

scholarly journals Lisinopril Indifferently Improves Heart Rate Variability During Day and Night Periods in Spontaneously Hypertensive Rats

2013 ◽  
pp. 237-245 ◽  
Author(s):  
S. ALBARWANI ◽  
S. AL-SIYABI ◽  
M. O. TANIRA
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Heart Rate Variability ◽  
Spontaneously Hypertensive Rats ◽  
Radio Telemetry ◽  
Tap Water ◽  
Fold Increase ◽  
Hypertensive Rats ◽  
Spontaneously Hypertensive ◽  
Arterial Blood

The aim of this work was to investigate the effect of 10 weeks of lisinopril treatment to spontaneously hypertensive rats (SHRs) on day/night variations of blood pressure, heart rate and autonomic cardio-regulation parameters. Male SHR with surgically implanted radio-telemetry implant that provided direct measurements of arterial pressure and electrocardiogram wave were used. Animals were allocated to two groups (n=5 each). The first group was treated with lisinopril (20 mg/kg by gavage) daily for 10 weeks (treated group); whereas the second was gavaged daily with tap water (untreated group). Arterial blood pressure, ECG and other telemetry parameters were recorded at the start and at the end of 10-week treatment. Collected data were analyzed using specialized software and were statistically tested. In addition to the expected lowering of blood pressure, spectral analysis of R-R intervals revealed that lisinopril treatment for 10 weeks significantly caused 2-3 fold increase in heart rate variability (HRV) during both active and inactive periods. However, R-R interval durations demonstrated variable distribution patterns during those periods. The cause of observed distribution pattern of R-R intervals during active and inactive periods may be of significance to better understand HRV changes and warrants further investigations.

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