Effects of intermittent hypoxia on structural vascular adaptation in chick embryos

1988 ◽  
Vol 254 (6) ◽  
pp. H1194-H1199
Author(s):  
T. H. Adair ◽  
J. P. Montani ◽  
A. C. Guyton
Keyword(s):  
Intermittent Hypoxia ◽  
Vascular System ◽  
Average Concentration ◽  
Whole Body ◽  
Control Group ◽  
Continuous Exposure ◽  
Chick Embryos ◽  
Low Oxygen ◽  
Intermittent Exposure ◽  
Tissue Cells

We explored whether the blood vascular system of the chick embryo adapts its structure to meet the maximum or average oxygen needs of the tissue cells. Chick embryos were grown in continuous 12% oxygen, continuous 16% oxygen, and intermittent 12% oxygen in which the embryos were exposed to 12% oxygen for 4 h each day. Control groups were grown in room air. Measurements of structural vascular resistance (SVR), i.e., the resistance of the maximally dilated vasculature, were used to estimate the whole body vascularity of the 14- or 15-day-old embryos. Continuous exposure to 12% oxygen decreased SVR by 63.1 +/- 1.2 (SE) %, and intermittent exposure to 12% oxygen decreased SVR by 55.6 +/- 0.5% when compared with a 15-day-old normoxic control group. Based on studies with continuous exposure to different levels of low oxygen, it was predicted that exposure to 19.5% oxygen, the average concentration for the intermittent hypoxia group, would decrease SVR by 15.0 +/- 0.3%. These results indicate that intermittent hypoxia at 12% oxygen was approximately 90% as effective as continuous hypoxia at the same level in decreasing SVR and about four times more effective than 19.5% continuous oxygen. Therefore, the results support the hypothesis that the blood vascular system adapts its structure to meet almost entirely the maximum oxygen needs of the tissue cells.

Whole body structural vascular adaptation to prolonged hypoxia in chick embryos

1987 ◽  
Vol 252 (6) ◽  
pp. H1228-H1234 ◽  
Author(s):  
T. H. Adair ◽  
A. C. Guyton ◽  
J. P. Montani ◽  
H. L. Lindsay ◽  
K. A. Stanek
Keyword(s):  
Vascular Resistance ◽  
Prolonged Exposure ◽  
Vascular System ◽  
Venous Pressure ◽  
Aortic Pressure ◽  
Whole Body ◽  
Control Group ◽  
Chick Embryos ◽  
Normoxic Control ◽  
Oxygen Group

We studied the role of hypoxia in the development of the blood vascular system using functional measurements of whole body and hindlimb structural vascular resistance in the chick embryo. The method is based on a newly developed whole body perfusion technique in which the maximally dilated blood vasculature of 14- to 15-day chick embryos is perfused through the extraembryonic blood vessels. Embryos were grown in 12% oxygen (Po2 65 mmHg, n = 18) or 16% oxygen (Po2 96 mmHg, n = 19) for the last 7 days of incubation and were compared with weight-matched (n = 17) and age-matched (n = 18) normoxic control groups (Po2 134 mmHg). Pressure-flow curves were generated for all embryos by increasing and decreasing the aortic pressure along 1-mmHg steps over a pressure range of 0-6 mmHg. Venous pressure was held at 0 mmHg by allowing the perfusate to flow freely from severed extraembryonic veins. The hydraulic resistance of the maximally dilated vascular bed, called the "structural vascular resistance," was decreased in a dose-related manner in the hypoxic groups to greater than 50% of control in the whole body and hindlimbs of the 12% oxygen group. The vessels of the 12% oxygen group were able to carry two and three times as much flow to the whole body and hindlimb tissues, respectively, as compared with the weight-matched normoxic control group. Therefore, the results support the hypothesis that prolonged exposure to hypoxia causes the blood vascular system to adapt its structure to allow greater amounts of blood to flow to the tissues at any given perfusion pressure gradient.

Vascular development in chick embryos: a possible role for adenosine

1989 ◽  
Vol 256 (1) ◽  
pp. H240-H246 ◽  
Author(s):  
T. H. Adair ◽  
J. P. Montani ◽  
D. M. Strick ◽  
A. C. Guyton
Keyword(s):  
Growth Regulation ◽  
Vascular System ◽  
Biological Effects ◽  
Physiological Role ◽  
Ringer Solution ◽  
Whole Body ◽  
Chick Embryos ◽  
Endogenous Adenosine ◽  
Maximum Decrease

We studied the possible role of adenosine in the development of the vasculature using 217 chick embryos. Adenosine (2-32 mumol/day), inosine (16 mumol/day), dipyridamole (0.04-0.4 mumol/day), or aminophylline (400 and 800 micrograms/day) were administered twice each day into the air space on days 11-14. Control embryos received Ringer solution. Whole body vascularity was estimated on day 15 as the whole body structural vascular resistance (SVR), i.e., the hydraulic resistance of the maximally dilated vasculature. Adenosine decreased the SVR in a dose-related manner at the lower dosage amounts but caused a maximum decrease in SVR at the higher dosage amounts averaging 30% below the Ringer control values. Equimolar amounts of adenosine and inosine decreased the SVR by the same extent. Dipyridamole, which potentiates the biological effects of endogenous adenosine, also decreased the SVR in a dose-related manner to values averaging approximately 30% below control. When the effects of endogenous adenosine were blocked by aminophylline, the SVR increased in a dose-related manner to approximately 100% above control at the highest dosage amount. These results suggest that adenosine could have a physiological role in growth regulation of the vascular system in the chick embryo.

scholarly journals Role of Raphe Magnus 5-HT1A Receptor in Increased Ventilatory Responses Induced by Intermittent Hypoxia in Rats

2021 ◽  
Author(s):  
Jiao Su ◽  
Yang Meng ◽  
Yifei Fang ◽  
Linge Sun ◽  
Mengge Wang ◽  
...  
Keyword(s):  
Intermittent Hypoxia ◽  
Male Rats ◽  
Whole Body ◽  
Chronic Intermittent Hypoxia ◽  
Control Group ◽  
Dependent Manner ◽  
Ventilatory Responses ◽  
Hypoxia Group ◽  
Raphe Magnus ◽  
Experimental Group

Abstract Background: Intermittent hypoxia induces increased ventilatory responses in a 5-HT-dependent manner. This study aimed to explore that effect of raphe magnus serotonin 1A receptor (5-HT1A) receptor on the increased ventilatory responses induced by intermittent hypoxia.Methods: Stereotaxic surgery was performed in adult male rats, and acute and chronic intermittent hypoxia models were established after recovery from surgery. The experimental group received microinjections of 5-HT1A receptor agonist 8-hydroxy-2-(di-n-propylamino)tetralin (8-OH-DPAT) into the raphe magnus nucleus (RMg). Meanwhile, the control group received microinjections of artificial cerebrospinal fluid instead of 8-OH-DPAT. Whole-body plethysmography was performed, and ventilatory responses were compared among the different groups of oxygen status.Results: Compared with the normoxia group, the acute intermittent hypoxia group exhibited higher ventilatory responses (e.g., shorter inspiratory time and higher tidal volume, frequency of breathing, minute ventilation, and mean inspiratory flow) (P<0.05). 8-OH-DPAT microinjection partly weakened these changes in the acute intermittent hypoxia group. Further, compared with the acute intermittent hypoxia group, rats in chronic intermittent hypoxia group exhibited higher measures of ventilatory responses after 1 day of intermittent hypoxia (P<0.05). These effects peaked after 3 days of intermittent hypoxia treatment and then decreased gradually. Moreover, these changes were diminished and even disappeared in the experimental group.Conclusions: The results indicate that RMg 5-HT1A receptor is involved in the modulation of the increased ventilatory responses induced by intermittent hypoxia.

Two Models of Hypoxia on Rat Myocardial Aerobic Metabolism Ability

2014 ◽  
Vol 926-930 ◽  
pp. 1132-1135
Author(s):  
Qiao Zhen Yan
Keyword(s):  
Intermittent Hypoxia ◽  
Exercise Group ◽  
Male Rats ◽  
Control Group ◽  
Ventricular Wall ◽  
Low Oxygen ◽  
Practice Group ◽  
Hypoxia Group ◽  
Group I ◽  
Significant Difference

The influence on rat myocardial aerobic capacity about IHT and Hilo.48 eight weeks SD male rats 48 for adaptability training a week later randomly divided into 6 groups,Control group (C), the exercise group (S), intermittent hypoxia group (I), intermittent hypoxia training (IS), high living in control group (H) and high live low practice group (HS),each group of eight.training group,aerobic exercise every day.Hypoxia group, hypoxic stimulus and hypoxia group three times a week,training load increasing every week.Partial slaughter after training,get the rat myocardial SDH and CCO respectively,measure its activity.Take the rat heart,test the rat ventricular wall thickness.After text:The SDH of myocardial have a very significant difference in S、I、IS、H、HS;The CCO of myocardial have a very significant difference in S、I、IS、H HS;Conclusion:The two kinds of low oxygen can improve the rat myocardial SDH and CCO,in this research IHT is superior to Hilo.

Studies of Calcium Absorption in Man Using a CD-2 Whole-Body Counter

1977 ◽  
Vol 16 (04) ◽  
pp. 163-167
Author(s):  
K. Bakos ◽  
Věra Wernischová
Keyword(s):  
Calcium Absorption ◽  
Whole Body ◽  
Control Group ◽  
Absorption Process ◽  
Whole Body Counter ◽  
Absorption Studies ◽  
Body Counting ◽  
Calcium Load ◽  
Calcium Malabsorption ◽  
Whole Body Counting

SummaryWhole-body counting makes an important contribution of radioisotope techniques to ȁEin vivo“ absorption studies, in comparison with other methods. In a large number of subjects, the method was tested for its usefulness in the diagnosis of calcium malabsorption. The effects of drugs, of the calcium load in the gut and of the whole-body content of calcium on the absorption process were studied in a control group.

PREDICTIVE SIGNIFICANCE OF HIGH SERUM FERRITIN LEVELS IN THE DEBUT OF MALIGNANT LYMPHOMA

2020 ◽  
pp. 74-81
Author(s):  
Babaeva T.N. ◽  
Seregina O.B. ◽  
Pospelova T.I.
Keyword(s):  
Serum Ferritin ◽  
Serum Ferritin Level ◽  
Ferritin Level ◽  
Prognostic Significance ◽  
Average Concentration ◽  
High Serum ◽  
Control Group ◽  
Malignant Neoplasms ◽  
Significant Prognostic Factor ◽  
Malignant Lymphomas

At present, the serum ferritin level is not included in the list of prognostic factors; however, it is known that its increased serum level in patients with malignant neoplasms relates with the tumor burden, the degree of disease activity and correlates with a worse prognosis in patients with hematologic malignancies.The normalization of serum ferritin level during remission period confirms the involving of hyperferritinemia in mechanisms of tumor progression and may testify for clinical importance of measurement of serum ferritin level in patients, including those with malignant lymphomas. Objective:The aim of this study was to assess of the prognostic significance of high ferritin levels at the onset of the disease in patients with malignant lymphomas. Materials and methods:98 patients with malignant lymphomaswere enrolled in this study, including 72 patients (73.5%) with non-Hodgkins lymphomas (NHL) and 26 patients (26.5%) with Hodgkin’s lymphoma (HL). The increased serum ferritin level (more than 350 ng/ml) was found in 53 (54.2%) patients with malignant lymphomas at the onset of disease and its average concentration was 587,62±131,6 ng/ml (8.3 times higher values of control group, p<0.001).Also the positive statistical correlationsbetween increased ferritin level and increased level of LDH (r=0.47, p<0.001, n=98) and C-reactive protein (r=0.41, p<0.001, n=98) as well as the presence of B-symptomswere found. The median OS was significantly shorter in the group of patients with increased ferritin level (more than 350 ng/ml) at the onset of disease in comparison with group of patients with normal ferritin level, where the median OS was not reach during the observation period. Patients with increased ferritin level before starting chemotherapy also showed worse results of overall survival and increased mortality risk (OR 8.122; 95% CI, 1.764-37.396;р<0.05) compare with a group of patients with ferritin level ˂350 hg/ml at the onset of disease. Conclusion:These results make it possible to include lymphomas’s patients with increased ferritin level at the onset of disease in the group with poor prognosis and lower OS, while the increased ferritin level in patients without previous blood transfusions should be considered as a significant prognostic factor.

scholarly journals A Comparison of the Effect of Two Types of Whole Body Vibration Platforms on Fibromyalgia. A Randomized Controlled Trial

2021 ◽  
Vol 18 (6) ◽  
pp. 3007
Author(s):  
José Antonio Mingorance ◽  
Pedro Montoya ◽  
José García Vivas Miranda ◽  
Inmaculada Riquelme
Keyword(s):  
Quality Of Life ◽  
Motor Function ◽  
Whole Body Vibration ◽  
Whole Body ◽  
Control Group ◽  
Body Vibration ◽  
Positive Effects ◽  
Therapy Program

Whole body vibration has been proven to improve the health status of patients with fibromyalgia, providing an activation of the neuromuscular spindles, which are responsible for muscle contraction. The present study aimed to compare the effectiveness of two types of whole body vibrating platforms (vertical and rotational) during a 12-week training program. Sixty fibromyalgia patients (90% were women) were randomly assigned to one of the following groups: group A (n = 20), who performed the vibration training with a vertical platform; group B (n = 20), who did rotational platform training; or a control group C (n = 20), who did not do any training. Sensitivity measures (pressure pain and vibration thresholds), quality of life (Quality of Life Index), motor function tasks (Berg Scale, six-minute walking test, isometric back muscle strength), and static and dynamic balance (Romberg test and gait analysis) were assessed before, immediately after, and three months after the therapy program. Although both types of vibration appeared to have beneficial effects with respect to the control group, the training was more effective with the rotational than with vertical platform in some parameters, such as vibration thresholds (p < 0.001), motor function tasks (p < 0.001), mediolateral sway (p < 0.001), and gait speed (p < 0.05). Nevertheless, improvements disappeared in the follow-up in both types of vibration. Our study points out greater benefits with the use of rotational rather than vertical whole body vibration. The use of the rotational modality is recommended in the standard therapy program for patients with fibromyalgia. Due to the fact that the positive effects of both types of vibration disappeared during the follow-up, continuous or intermittent use is recommended.

scholarly journals Effect of Whole-Body Cryotherapy on Morphological, Rheological and Biochemical Indices of Blood in People with Multiple Sclerosis

2021 ◽  
Vol 10 (13) ◽  
pp. 2833
Author(s):  
Bartłomiej Ptaszek ◽  
Aneta Teległów ◽  
Justyna Adamiak ◽  
Jacek Głodzik ◽  
Szymon Podsiadło ◽  
...  
Keyword(s):  
Multiple Sclerosis ◽  
Neurological Diseases ◽  
Venous Blood ◽  
Whole Body ◽  
Controlled Study ◽  
Control Group ◽  
Blood Indices ◽  
Rheological Indices ◽  
Whole Body Cryotherapy ◽  
The Impact

The aim of this study was to examine and assess the impact of a series of 20 whole-body cryotherapy (WBC) treatments on the biochemical and rheological indices of blood in people with multiple sclerosis. In this prospective controlled study, the experimental group consisted of 15 women aged 34–55 (mean age, 41.53 ± 6.98 years) with diagnosed multiple sclerosis who underwent a series of whole-body cryotherapy treatments. The first control group consisted of 20 women with diagnosed multiple sclerosis. This group had no intervention in the form of whole-body cryotherapy. The second control group consisted of 15 women aged 30–49 years (mean age, 38.47 ± 6.0 years) without neurological diseases and other chronic diseases who also underwent the whole-body cryotherapy treatment. For the analysis of the blood indices, venous blood was taken twice (first, on the day of initiation of whole-body cryotherapy treatments and, second, after a series of 20 cryotherapy treatments). The blood counts were determined using an ABX MICROS 60 hematological analyzer (USA). The LORCA analyzer (Laser–Optical Rotational Cell Analyzer, RR Mechatronics, the Netherlands) was used to study the aggregation and deformability of erythrocytes. The total protein serum measurement was performed using a Cobas 6000 analyzer, Roche and a Proteinogram-Minicap Sebia analyzer. Fibrinogen determinations were made using a Bio-Ksel, Chrom-7 camera. Statistically significant differences and changes after WBC in the levels of red blood cells (RBC), hemoglobin (HGB), hematocrit (HCT), elongation index, total extend of aggregation (AMP), and proteins (including fibrinogen) were observed. However, there was no significant effect of a series of 20 WBC treatments on changes in blood counts, rheology, and biochemistry in women with multiple sclerosis. Our results show that the use of WBC has a positive effect on the rheological properties of the blood of healthy women.

Neutral douche: a hydrotherapeutic tool to manage pain and systemic symptoms in primary dysmenorrhea - a randomised controlled study

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Sataz Rahmania ◽  
Vanitha Shetty ◽  
Balakrishnan Ragavendrasamy
Keyword(s):  
Repeated Measures ◽  
Whole Body ◽  
Pharmacological Intervention ◽  
Controlled Study ◽  
Control Group ◽  
Mcgill Pain Questionnaire ◽  
Primary Dysmenorrhea ◽  
Primary Dysmenorrhoea ◽  
Systemic Symptoms ◽  
Experimental Group

AbstractBackground & ObjectivesThe douche, one of the hydrotherapeutic treatment modality is commonly used by Naturopathy physicians as a treatment of choice in the management of several ailments. This study was done to assess the effect of full body neutral douche in the management of pain and systemic symptoms in adult females with primary dysmenorrhoea.Methods68 subjects of age 18-22 years with primary dysmenorrhoea were recruited for the study and were randomly divided into two groups: the experimental group (n = 34) and the control group (n = 34). The experimental group received whole body neutral douche, whereas the control group followed the routine as usual. Assessments for the pain, systemic symptoms and menstrual cramps were done by using McGill Pain Questionnaire, Verbal multidimensional scoring system and analog scale for severity of pain and menstrual cramps respectively at baseline, day 30 and day 60 of intervention. Two- way repeated measures of ANOVA was performed to understand the between group changes, adjusted for the respective baseline values and age.ResultData was analyzed with SPSS (Version 21.0) package. Neutral douche resulted in significant improvement in pain [F(2,66) = 114.564, p < 0.0005, partial ?2 = 0.771], severity of pain [F(2,66) = 70.418, p < 0.0005, partial ?2 = 0.681], cramps [F(2,66) = 75.986, p < 0.0005, partial ?2 = 0.697] and systemic symptoms [F(2,66) = 14.64, p < 0.0005, partial ?2 = 0.307] as compared to the control group.ConclusionFindings suggest that neutral douche can be used as a non-pharmacological intervention in the management of pain and systemic symptoms in primary dysmenorrhea.

scholarly journals Higher Impulse Electromyostimulation Contributes to Psychological Satisfaction and Physical Development in Healthy Men

Medicina ◽  
2021 ◽  
Vol 57 (3) ◽  
pp. 191
Author(s):  
Kangho Kim ◽  
Denny Eun ◽  
Yong-Seok Jee
Keyword(s):  
Body Image ◽  
Body Shape ◽  
Subcutaneous Fat ◽  
Self Esteem ◽  
Analysis Of Covariance ◽  
Whole Body ◽  
Control Group ◽  
Visceral Fat Area ◽  
Total Fat ◽  
Muscle Groups

Background and Objectives: This study investigated the various impulse effects of whole-body electromyostimulation (WB-EMS) on psychophysiological responses and adaptations. Materials and Methods: The participants included fifty-four men between 20 and 27 years of age who practiced isometric exercises for 20 min, three days a week, for 12 weeks while wearing WB-EMS suits, which enabled the simultaneous activation of eight muscle groups with three types of impulse intensities. Participants were allocated to one of four groups: control group (CON), low-impulse-intensity group (LIG), mid-impulse-intensity group (MIG), and high-impulse-intensity group (HIG). Psychophysiological conditions were measured at week 0, week 4, week 8, and week 12. Results: Compared with the CON, (1) three psychological conditions in LIG, MIG, and HIG showed positive tendencies every four weeks, and the analysis of covariance (ANCOVA) test revealed that body image (p = 0.004), body shape (p = 0.007), and self-esteem (p = 0.001) were significantly different among the groups. (2) Body weight, fat mass, body mass index, and percent fat in the CON showed decreasing tendencies, whereas those in LIG, MIG, and HIG showed a noticeable decrease, which revealed that there were significant differences among the groups. Specifically, a higher impulse intensity resulted in a greater increase in muscle mass. (3) Although there was no interaction effect in the abdominal visceral fat area, there were significant interactions in the abdominal subcutaneous fat (ASF) and total fat (ATF) areas. Both the ASF and ATF in the CON showed decreasing tendencies, whereas those in other groups showed a noticeable decrease. The ANCOVA revealed that the ASF (p = 0.002) and ATF (p = 0.001) were significantly different among the groups. In particular, the higher the impulse intensity, the greater the decrease in abdominal fat. Conclusions: This study confirmed that high-impulse-intensity EMS can improve psychophysiological conditions. In other words, healthy young adults felt that the extent to which their body image, body shape, and self-esteem improved depended on how intense their EMS impulse intensities were. The results also showed that higher levels of impulse intensity led to improved physical conditions.

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