Glutathione metabolic responses to loaded breathing: variation among respiratory muscles

1996 ◽  
Vol 81 (3) ◽  
pp. 1362-1369 ◽  
Author(s):  
G. Supinski ◽  
D. Nethery ◽  
N. Murhez ◽  
R. Ciufo ◽  
A. DiMarco
Keyword(s):  
Respiratory Muscles ◽  
Respiratory Arrest ◽  
Resistive Load ◽  
Control Groups ◽  
Rib Cage ◽  
Loaded Breathing ◽  
Glutathione Oxidation ◽  
Muscle Groups ◽  
And Control ◽  
Gssg Level

Several studies have shown that loaded breathing elicits an oxidation of reduced glutathione (GSH) to oxidized glutathione (GSSG) within the diaphragm, but the effects of loaded breathing on GSH and GSSG levels in other respiratory muscles have not been examined. The present experiment examined this issue by using decerebrate unanesthetized rats in which a large inspiratory resistive load was applied until respiratory arrest. Subsequently, muscle samples from the triangularis sterni, diaphragm (Dia), parasternal intercostal (PI), upper rib cage lateral intercostal, lower rib cage lateral intercostal, and soleus were assayed for GSH and GSSG. Glutathione levels were also measured on samples from unloaded control animals. We found that the Dia from loaded animals had a lower GSH level than did control animals (i.e., 653 +/- 99 and 928 +/- 40 nmol/gm for loaded and control groups, respectively; P < 0.05), higher GSSG level (68 +/- 14 and 32 &/- 7 nmol/gm for loaded and control groups, respectively; P < 0.05), and higher GSSG-to-GSH ratios (GSSG/GSH; 17.0 +/- 6.0 and 3.7 +/- 0.9% for loaded and control groups, respectively; (P <0.05). Of the other muscles examined, only the PI muscles had comparable alterations in glutathione levels in response to loading. Specifically, for the PI muscles of loaded and control groups, GSH was 427 +/- 75 and 618 +/- 40 nmol/g, (P < 0.05), GSSG was 71 +/- 16 and 20 +/- 5 nmol/g (P < 0.01), and GSSG/GSH was 22 +/- 8 and 3.6 +/- 1.2%, respectively (P < 0.05). No other muscle demonstrated a significant increase in GSSG or GSSG/GSH with loading, and only the lower rib cage lateral intercostal had a significant reduction in GSH. These findings indicate variation in the degree of glutathione oxidation elicited by inspiratory loading among the different respiratory muscles. The fact that quantitatively similar glutathione alterations were observed in the Dia and PI muscles suggests that these muscle groups may share a similar propensity to generate free radicals during inspiratory loading.

N-acetylcysteine administration alters the response to inspiratory loading in oxygen-supplemented rats

1997 ◽  
Vol 82 (4) ◽  
pp. 1119-1125 ◽  
Author(s):  
G. S. Supinski ◽  
D. Stofan ◽  
R. Ciufo ◽  
A. Dimarco
Keyword(s):  
Free Radical ◽  
Respiratory Failure ◽  
Respiratory Muscles ◽  
Treated Group ◽  
Respiratory Arrest ◽  
Saline Group ◽  
Free Radical Scavenger ◽  
Radical Scavenger ◽  
Resistive Load ◽  
Loaded Breathing

Supinski, G. S., D. Stofan, R. Ciufo, and A. DiMarco. N-acetylcysteine administration alters the response to inspiratory loading in oxygen-supplemented rats. J. Appl. Physiol. 82(4): 1119–1125, 1997.—Based on recent studies, it has been suggested that free radicals are elaborated in the respiratory muscles during strenuous contractions and contribute to the development of muscle fatigue. If this theory is correct, then it should be possible to attenuate the development of diaphragm fatigue and/or delay the onset of respiratory failure during loaded breathing by administering a free radical scavenger. The purpose of the present experiment was, therefore, to examine the effect of N-acetylcysteine (NAC), a free radical scavenger and glutathione precursor, on the evolution of respiratory failure in decerebrate unanesthetized rats breathing against a large inspiratory resistive load. We compared the inspiratory volume and pressure generation over time in animals pretreated with either saline or NAC (150 mg/kg) and then loaded until respiratory arrest. After arrest, the diaphragm was excised, and samples were assayed for reduced (GSH) and oxidized glutathione. As a control, we also assessed respiratory function and glutathione concentrations in groups of nonloaded saline- and NAC-treated animals. We found that NAC-treated animals were able to tolerate loading better than the saline-treated group, maintaining higher inspiratory pressures and sustaining higher inspired volumes. Administration of NAC also increased the time that animals could tolerate loading before the development of respiratory arrest. In addition, although saline-treated loaded animals had significant reductions in diaphragmatic GSH levels compared with unloaded controls, the magnitude of this reduction was blunted by NAC administration (i.e., GSH averaged 965 ± 113, 568 ± 83, 907 ± 39, and 784 ± 61 nmol/g for unloaded-saline, loaded-saline, unloaded-NAC, and loaded-NAC groups, P< 0.05, with the value for the loaded-saline group lower than the values for the two unloaded groups; GSH for the loaded-NAC group was not different, however, from unloaded controls). These data demonstrate that administration of NAC, a free radical scavenger, slows the rate of development of respiratory failure during inspiratory resistive loading.

Sensation of inspired volume in normal subjects and quadriplegic patients

1982 ◽  
Vol 53 (6) ◽  
pp. 1481-1486 ◽  
Author(s):  
A. F. DiMarco ◽  
D. A. Wolfson ◽  
S. B. Gottfried ◽  
M. D. Altose
Keyword(s):  
Magnitude Estimation ◽  
Muscle Tension ◽  
Upper Airway ◽  
Normal Subjects ◽  
Motor Command ◽  
Resistive Load ◽  
Rib Cage ◽  
Lidocaine Solution ◽  
Loaded Breathing ◽  
The Central Nervous System

To investigate the influence of respiratory muscle tension and feedback from rib cage receptors, the sensation of inspired volume was compared in normal subjects and quadriplegic patients during active breathing, with and without the addition of an inspiratory resistive load, and during passive ventilation produced by a tank respirator. In separate trials, volume sensation was assessed using tests of magnitude estimation and volume reproduction. The mean exponents and standard errors for the magnitude estimation of inspired volume in normal subjects were 1.32 +/- 0.08, 1.24 +/- 0.06, and 1.23 +/- 0.09 during passive, active, and loaded breathing, respectively. These values were not significantly different from one another, nor were there any differences between normal subjects and quadriplegics. During volume reproduction trials where the mechanical conditions were different between control and test breaths, the inspired volumes during active unloaded breathing were significantly smaller than during passive ventilation but greater than the inspired volumes during loaded breathing. Errors in volume reproduction were no different in normal subjects and quadriplegics, suggesting that inputs from rib cage receptors are not essential for the sensation of inspired volume. The sensation of inspired volume in both normal subjects and quadriplegics was found to be unaffected by inhalation of a 2% lidocaine solution. This suggests that upper airway receptors are also not essential for volume sensation. The intensity of the sensation of a given inspired volume may depend on the level of the central nervous system motor command and/or on the tension developed by the diaphragm.

Nonhomogeneous alveolar pressure swings: effect of different respiratory muscles

1982 ◽  
Vol 52 (3) ◽  
pp. 638-641 ◽  
Author(s):  
R. Brown ◽  
S. M. Scharf ◽  
R. Ingram
Keyword(s):  
Lower Lobe ◽  
Respiratory Muscles ◽  
Alveolar Pressure ◽  
Lobe Bronchus ◽  
Rib Cage ◽  
Dimensional Changes ◽  
Thoracic Gas Volume ◽  
Airway Opening ◽  
The Difference ◽  
Muscle Groups

We tested the hypothesis in dogs that during isovolumic inspiratory efforts the degree of nonhomogeneity of alveolar pressure changes is influenced by regional differences in respiratory muscle activity. Pressure distal to an occluded right lower lobe bronchus (PRLL) was compared with pressure in the occluded airway opening (PaO) during spontaneous inspiratory efforts (S), during right (RP), left (LP), and bilateral (BP) phrenic nerve stimulation, and during spontaneous inspiratory efforts after cutting both phrenic nerves (SCP), Upper and lower rib cage and abdominal dimensional changes were monitored by magnetometers. PRLL was greater than Pao during S and the difference was greater during BP and greater during RP, whereas with LP and SCP Pao exceeded PRLL. Compared with S, during RP, LP, and BP there was greater upper rib cage inward motion relative to abdominal outward motion. SCP resulted in opposite upper rib cage-abdomen relative motions. Thus activities of various muscle groups produced different regional pressures and deformations of rib cage and abdomen. These results may relate to potential errors in plethysmographic determination of thoracic gas volume in the presence of airway closure.

scholarly journals Endocrinal assessment of chronic obstructive pulmonary disease patients as compared to control groups

2017 ◽  
Vol 5 (4) ◽  
pp. 1640
Author(s):  
Amardeepak Toppo ◽  
D. Sudheer ◽  
G. S. Rajawat ◽  
Thomas Kurian
Keyword(s):  
Growth Hormone ◽  
Respiratory Muscles ◽  
Serum Testosterone ◽  
Chronic Obstructive ◽  
Control Groups ◽  
Serum Growth Hormone ◽  
Obstructive Pulmonary Disease ◽  
Copd Patients ◽  
Significant Difference ◽  
And Control

Background: Hormones also take part in respiratory control via peripheral chemo receptors or by their local effects on the lungs and the airways. In chronic obstructive pulmonary disease patients, respiratory muscles are required to work efficiently than normal individuals to establish a sufficient respiration. Changes in serum hormone levels of COPD patients adversely affect functioning of respiratory muscles. Objective of the study was to assess endocrinal profile in COPD patient with comparable control groups.Methods: A Hospital based Case control study conducted at Department of Pulmonary Medicine, Late B.R.K.M Government Medical College, Jagdalpur, Chhattisgarh, India during July 2016 to January 2017. Study included 75 diagnosed cases of COPD in which moderate, severe, very severe COPD was 25 in each of this group (per GOLD ‘s guideline) and compared to age matched 25 healthy control.Results: In this study serum growth hormone and serum testosterone showed significant difference between COPD cases and control group and fair significant difference in serum FSH between COPD cases and control groups. There was no significant correlation between serum growth hormone, serum testosterone and serum FSH with COPD grading. There was no statistically difference observed in serum LH (p=0.425) level between COPD cases and control groups. Present study showed there was statistically difference in FT3, FT4 and TSH level between COPD cases and control groups. There was significant negative correlation between FT4 levels between COPD grading. But no correlation seen between COPD grading and control with respect to serum FT3 and TSH level.Conclusions: Endocrinal assessment in present study showed significant decrease in serum growth hormone and serum testosterone in COPD patients, which are anabolic hormones. Early detection and correction of such an anabolic hormonal abnormality may prevent skeletal and diaphragmatic muscle weakness, and improve respiratory drive of COPD patients.

Blood flow distribution within the rib cage muscles

1991 ◽  
Vol 70 (6) ◽  
pp. 2559-2565 ◽  
Author(s):  
A. Brancatisano ◽  
T. C. Amis ◽  
A. Tully ◽  
L. A. Engel
Keyword(s):  
Blood Flow ◽  
Spontaneous Breathing ◽  
Regional Distribution ◽  
Respiratory Muscles ◽  
Flow Distribution ◽  
Blood Flow Distribution ◽  
Ps Ii ◽  
Rib Cage ◽  
Resistive Loading ◽  
Loaded Breathing

We used 15-microns radiolabeled microspheres to study the regional distribution of blood flow (Q) among parasternal (PS), transversus thoracis, and external (EI) and internal intercostal muscles (II) in nine anesthetized supine mongrel dogs. We measured Q (ml.min-1.100 g-1) in each intercostal space (ICS) during spontaneous breathing, inspiratory resistive loading, and mechanical ventilation following paralysis. At necropsy the EI, II, and PS were excised and sampled separately for each ICS. During paralysis there was no consistent gradient in Q among the PS, II, and EI muscles. During spontaneous breathing, Q to PS increased linearly by 125% between the first and fourth to sixth ICS, Q to EI decreased progressively from the first/second ICS to the fifth/sixth ICS, whereas Q to the II was uniform. During inspiratory resistive loading, in which mouth pressures of -16 +/- 4 cmH2O were generated, the PS gradient was similar to that during spontaneous breathing. Also, Q to the EI increased in the cranial interspaces (P less than 0.02), whereas Q to the II of the seventh/eighth ICS was greater than that of the first/second ICS (P less than 0.001). Furthermore, with loading, ventrodorsal gradients in Q appeared within both EI and II interspaces. There was no consistent gradient in Q within the transversus thoracis muscle during any of the interventions. Our results demonstrate nonuniform Q within PS, EI, and II during both spontaneous and inspiratory resistive loaded breathing. On the assumption that changes in Q reflect changes in activation, our results suggest systematic topographical patterns of recruitment of rib cage respiratory muscles.

Conjugated Linoleic Acid Causes a Marked Increase in Liver α-Tocopherol and Liver α-Tocopherol Transfer Protein in C57BL/6 J Mice

2010 ◽  
Vol 80 (1) ◽  
pp. 65-73 ◽  
Author(s):  
Pei-Min Chao ◽  
Wan-Hsuan Chen ◽  
Chun-Huei Liao ◽  
Huey-Mei Shaw
Keyword(s):  
Antioxidant Enzymes ◽  
Linoleic Acid ◽  
Conjugated Linoleic Acid ◽  
Thiobarbituric Acid ◽  
Control Group ◽  
Thiobarbituric Acid Reactive Substances ◽  
Control Groups ◽  
Protein Levels ◽  
Transfer Protein ◽  
And Control

Conjugated linoleic acid (CLA) is a collective term for the positional and geometric isomers of a conjugated diene of linoleic acid (C18:2, n-6). The aims of the present study were to evaluate whether levels of hepatic α-tocopherol, α-tocopherol transfer protein (α-TTP), and antioxidant enzymes in mice were affected by a CLA-supplemented diet. C57BL/6 J mice were divided into the CLA and control groups, which were fed, respectively, a 5 % fat diet with or without 1 g/100 g of CLA (1:1 mixture of cis-9, trans-11 and trans-10, cis-12) for four weeks. α-Tocopherol levels in plasma and liver were significantly higher in the CLA group than in the control group. Liver α-TTP levels were also significantly increased in the CLA group, the α-TTP/β-actin ratio being 2.5-fold higher than that in control mice (p<0.01). Thiobarbituric acid-reactive substances were significantly decreased in the CLA group (p<0.01). There were no significant differences between the two groups in levels of three antioxidant enzymes (superoxide dismutase, glutathione peroxidase, and catalase). The accumulation of liver α-tocopherol seen with the CLA diet can be attributed to the antioxidant potential of CLA and the ability of α-TTP induction. The lack of changes in antioxidant enzyme protein levels and the reduced lipid peroxidation in the liver of CLA mice are due to α-tocopherol accumulation.

The Prospects and Risks Connected with Increasing the Level of Self-Organisation in Students

2020 ◽  
pp. 75-81
Author(s):  
Svetlana Alexandrovna Kosareva ◽  
Keyword(s):  
Higher Education ◽  
Professional Competence ◽  
Initial Level ◽  
Education Institution ◽  
Diagnostic Methods ◽  
Study Guide ◽  
Learning Approaches ◽  
Control Groups ◽  
Self Organisation ◽  
And Control

The paper describes the method for increasing the level of self-organisation in students which has been developed by the author. It also contains the method testing results and presents the prospects and risks teachers could face while applying the method in a higher education institution. The purpose of this study is to find out the prospects and risks of applying the method for increasing the level of self-organisation in students and to determine the ways of reducing the risks. Methodology. The author points out the learning approaches which were the basis of developing the method and describes diagnostic methods for determining students’ self-organisation levels. The work focused on increasing each student’s initial level consists of a theoretical and a practical part and includes project activities on creating a study guide. The results of the study. The method developed proved to be effective. It was established by diagnosing the final level of self-organisation in students in the experimental and control groups. The paper considers the advantages of the method among which there is universal character, flexibility, improvements to teacher’s and students’ professional competence, etc. At the same time it is necessary to be aware of the risks due to the increased amount of teacher’s work and the fact that students’ work within the project tends to be monotonous. In conclusion, the prospects of the method for increasing the level of self-organisation in students are related to its advantages and the final results of the work. The risks of its use can be reduced with the help of the measures proposed in the paper.

Sri Lankan Cleft Lip and Palate Study Model Analysis: Clefts of the Secondary Palate

1993 ◽  
Vol 30 (2) ◽  
pp. 227-230 ◽  
Author(s):  
Andrew Mccance ◽  
David Roberts-Harry ◽  
Martyn Sherriff ◽  
Michael Mars ◽  
William J.B. Houston
Keyword(s):  
Cleft Lip ◽  
Cleft Lip And Palate ◽  
Model Analysis ◽  
Control Group ◽  
Tooth Size ◽  
Sri Lankan ◽  
Control Groups ◽  
Secondary Palate ◽  
Comparable Control ◽  
And Control

The study models of a group of adult Sri Lankan patients with clefts of the secondary palate were investigated. Tooth-size and arch-dimension comparisons were made with a comparable control group. Significant differences were found between the cleft and control groups in tooth sizes, chord lengths, and arch widths. The cleft group dimensions were generally smaller than those of the control group. Overjets were larger in the cleft group.

THE EFFECT OF APPLYING ANIMAL CARTOON PICTURES ON STUDENTS’ ACHIEVEMENT IN WRITING NARRATIVE TEXT

2017 ◽  
Vol 6 (1) ◽  
Author(s):  
Hasanul Arifin Zul And Masitowarni Siregar
Keyword(s):  
T Test ◽  
Narrative Text ◽  
Control Group ◽  
First Year ◽  
Writing Achievement ◽  
Control Groups ◽  
Post Test ◽  
Written Test ◽  
And Control ◽  
Experimental Group

This thesis is focused on the investigation of the effect of applying animal cartoon pictures on students’ achievement in writing narrative text. This study aims to find whether applying animal cartoon pictures significantly affect the students’ writing achievement or not. The data in this study were obtained by administering a written test. The population was the 2015/2016 first year (grade XI) of SMA Swasta Nusantara Lubuk Pakam and 66 students were taken as the sample by using random sampling. The sample was divided into two groups, experimental and control groups. The experimental group was taught by applying animal cartoon pictures while the control group without animal cartoon pictures (x = lecturing). The data were taken the scores from the pre-test and post-test to both experimental and control groups. These data were analyzed by using t-test. The result of computing the t-test obviously showed that t-observed is higher than t-table (5.21 >1,67) with the degree of freedom 64 (df =N-2) at the level significance 0,05 one tail test. It showed that the application of animal cartoon pictures significantly affected the students of SMA Swasta Nusantara Lubuk Pakam achievement in writing narrative text.

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