scholarly journals Short-term effect of reduction in forced vital capacity after diving exposure

2017 ◽  
Author(s):  
Hua Cheng
Keyword(s):  
Forced Vital Capacity ◽  
Vital Capacity ◽  
Minute Ventilation ◽  
Pulmonary Ventilation ◽  
Common Factor ◽  
Cumulative Effect ◽  
Forced Expiratory Volume ◽  
Control Group ◽  
Short Term ◽  
Small Depth

To discuss whether there is relationship between short-term and long-time attenuation effects of ventilation caused by diving activity. The ventilation observed before and after hyperbaric exposure for 20min by case-control experiments. Participants of the experimental group (EG) stayed for 20min under 12-m underwater and the control group (CG) stayed in hyperbaric chamber under pressure of 2.2ATA. Immediate effects of pulmonary ventilation detected by the Spirometer and compared by paired T test to reveal the different caused by environmental pressure. The Vital Capacity (VC) rises while the Minute Ventilation (MV), Maximal Voluntary Ventilation (MVV) decreases after the exposure for 20min in both groups. The Forced Vital Capacity (FVC) is detected decreased significantly in EG (t=1.21, P =0.25) while it slightly increased in CG (t=-0.42, P =0.68).The ratio of Forced Expiratory Volume in one second to VC (FEV1.0/VC %) increase in EG (t=-0.73, P=0.48) while decrease in CG (t=0.42, P=0.17). The Ratio of FEV1.0 to FVC (FEV1.0 %) values increase obviously in EG (t=-1.48, P =0.16) and a bit in CG (t=-0.23, P =0.82). High pressure is the common factor in both groups that leads the changes in the same trend in VC, MV and MVV. Extra factors as immersion effect, loading of diving equipment and low temperature underwater, would encounter EG participants. Instant reduced effects of FVC under diving exposure in the study are quite consistent with the long-term cumulative effect of professional divers in previous research, which illustrated even small depth of short-range diving exercise have definite influences on ventilation.

scholarly journals Short-term effect of reduction in forced vital capacity after diving exposure

2017 ◽  
Author(s):  
Hua Cheng
Keyword(s):  
Forced Vital Capacity ◽  
Vital Capacity ◽  
Minute Ventilation ◽  
Pulmonary Ventilation ◽  
Common Factor ◽  
Cumulative Effect ◽  
Forced Expiratory Volume ◽  
Control Group ◽  
Short Term ◽  
Small Depth

To discuss whether there is relationship between short-term and long-time attenuation effects of ventilation caused by diving activity. The ventilation observed before and after hyperbaric exposure for 20min by case-control experiments. Participants of the experimental group (EG) stayed for 20min under 12-m underwater and the control group (CG) stayed in hyperbaric chamber under pressure of 2.2ATA. Immediate effects of pulmonary ventilation detected by the Spirometer and compared by paired T test to reveal the different caused by environmental pressure. The Vital Capacity (VC) rises while the Minute Ventilation (MV), Maximal Voluntary Ventilation (MVV) decreases after the exposure for 20min in both groups. The Forced Vital Capacity (FVC) is detected decreased significantly in EG (t=1.21, P =0.25) while it slightly increased in CG (t=-0.42, P =0.68).The ratio of Forced Expiratory Volume in one second to VC (FEV1.0/VC %) increase in EG (t=-0.73, P=0.48) while decrease in CG (t=0.42, P=0.17). The Ratio of FEV1.0 to FVC (FEV1.0 %) values increase obviously in EG (t=-1.48, P =0.16) and a bit in CG (t=-0.23, P =0.82). High pressure is the common factor in both groups that leads the changes in the same trend in VC, MV and MVV. Extra factors as immersion effect, loading of diving equipment and low temperature underwater, would encounter EG participants. Instant reduced effects of FVC under diving exposure in the study are quite consistent with the long-term cumulative effect of professional divers in previous research, which illustrated even small depth of short-range diving exercise have definite influences on ventilation.

scholarly journals Short-Term Effect of Reduction in Forced Vital Capacity After Diving Exposure

2021 ◽  
Vol 6 (4) ◽  
Keyword(s):  
Forced Vital Capacity ◽  
Vital Capacity ◽  
Minute Ventilation ◽  
Pulmonary Ventilation ◽  
Common Factor ◽  
Cumulative Effect ◽  
Forced Expiratory Volume ◽  
Control Group ◽  
Short Term ◽  
Small Depth

To discuss whether there is relationship between short-term and long-time attenuation effects of ventilation caused by diving activity. The ventilation observed before and after hyperbaric exposure for 20min by case-control experiments. Participants of the experimental group (EG) stayed for 20min under 12-m underwater and the control group (CG) stayed in hyperbaric chamber under pressure of 2.2ATA. Immediate effects of pulmonary ventilation detected by the Spirometer and compared by paired T test to reveal the different caused by environmental pressure. The Vital Capacity (VC) rises while the Minute Ventilation (MV), Maximal Voluntary Ventilation (MVV) decreases after the exposure for 20min in both groups. The Forced Vital Capacity (FVC) is detected decreased significantly in EG (t=1.21, P =0.25) while it slightly increased in CG (t=-0.42, P =0.68). The ratio of Forced Expiratory Volume in one second to VC (FEV1.0/VC %) increase in EG (t=-0.73, P=0.48) while decrease in CG (t=0.42, P=0.17). The Ratio of FEV1.0 to FVC (FEV1.0 %) values increase obviously in EG (t=-1.48, P =0.16) and a bit in CG (t=-0.23, P =0.82). High pressure is the common factor in both groups that leads the changes in the same trend in VC, MV and MVV. Extra factors as immersion effect, loading of diving equipment and low temperature underwater, would encounter EG participants. Instant reduced effects of FVC under diving exposure in the study are quite consistent with the long-term cumulative effect of professional divers in previous research, which illustrated even small depth of short-range diving exercise have definite influences on ventilation.

Exercise performance after ventilatory work

1982 ◽  
Vol 52 (6) ◽  
pp. 1581-1585 ◽  
Author(s):  
B. Martin ◽  
M. Heintzelman ◽  
H. I. Chen
Keyword(s):  
Vital Capacity ◽  
Minute Ventilation ◽  
Forced Expiratory Volume ◽  
Muscle Endurance ◽  
O2 Uptake ◽  
Short Term ◽  
Running Performance ◽  
Volitional Exhaustion ◽  
Ventilatory Muscles

Although increased ventilation is one of the most readily observed physiological responses to exercise, it is uncertain how severely this hyperpnea stresses the ventilatory muscles. As one approach to this question, we compared short-term maximal running performance in nine subjects with and without prior ventilatory work designed to reduce ventilatory muscle endurance. This work consisted of 150 min of sustained maximum ventilation performed isocapnically while the subjects were seated. Both the level of sustained expired minute ventilation and the O2 uptake associated with it slowly declined with time during this 150-min period. On the average, subjects were able to maintain two-thirds of their 12-s maximum voluntary ventilation (MVV) during this long-term breathing test. The test had no effect on subsequently measured vital capacity, forced expiratory volume in 1 s, or the MVV. However, in short-term maximal running, at constant speed upgrades increased 1% each minute until volitional exhaustion, performance after prior breathing work was reduced as compared with control (6.5 vs. 7.6 min; P less than 0.01). Subjects ceased work at significantly lower ventilation (117 vs. 124 1.min-1 BTPS; P less than 0.05) and heart rate (179 vs. 187 beats.min-1; P less than 0.01) and reached significantly lower peak O2 uptake (3.07 vs. 3.24 1.min-1 STPD; P less than 0.05) during maximal running after ventilatory work. We conclude that reduced ventilatory muscle endurance alone is sufficient to decrease short-term maximal running performance.

scholarly journals Evaluation of lung function among the Indian elite female weightlifters

2017 ◽  
Vol 5 (3) ◽  
pp. 987
Author(s):  
Snehunsu Adhikari ◽  
Adilakshmi Perla ◽  
Suresh Babu Sayana ◽  
Mithilesh K. Tiwari ◽  
Tambi Medabala
Keyword(s):  
Lung Function ◽  
Forced Vital Capacity ◽  
Vital Capacity ◽  
Lung Function Test ◽  
Forced Expiratory Volume ◽  
Physiological Adaptation ◽  
Control Group ◽  
Study Group ◽  
Significant Difference ◽  
Health And Disease

Background: Spirometry is an essential tool to evaluate lung function of health and disease. Adaptability of lung and chest among athletes can be assessed by lung function test (LFT). The quest of our study was to evaluate the lung function (LF) of highly trained Indian female weighting athletes, and intended to appraise the adaptation of LF among trained elite athletes.Methods: Top ranked Indian female professional weightlifters (study group, n=6) were recruited for this study. Three out of the six weightlifters were from top ten world ranking of 6th, 7th and 9th. Age matched controls (control group, n=6) were selected for this study. Maximum voluntary ventilation (MVV), vital capacity (VC), forced vital capacity (FVC), percentage of forced expiratory volume in first second (FEV1%) and ratio of forced expiratory volume in first second and forced vital capacity (FEV1/FVC%) have been evaluated as per the ATS/ERS guidelines.Results: Statistically higher significant values of VC and FVC were noted in study group, where as other values (MVV, FEV1% and FEV1/FVC%) found no significant difference between two groups.Conclusions: Power, strength and explosiveness of the skeletal muscles are vital domains in weightlifting sport. Weightlifting is such a sport doesn’t require much ventilatory efforts during training as well as competition. This study clueing that physiological adaptation/ improvement of the pulmonary function (PF) depends on the type of the sport being engaged by the athletes.

Effect of Short-Term Practice of Breathing Exercises on the Breathing Capacity in Children

2021 ◽  
Vol 1 (2) ◽  
Author(s):  
Hélder JT Costa
Keyword(s):  
Forced Vital Capacity ◽  
Vital Capacity ◽  
Exercise Program ◽  
Control Group ◽  
Short Term ◽  
Breathing Exercise ◽  
School Aged Children ◽  
Breathing Exercises ◽  
Breathing Mechanism ◽  
Experimental Group

The breathing mechanism has existed since our birth and accompanies us throughout life. Breathing is an important function in the regulatory process of numerous body functions, its optimization can bring many health benefits. However, many children are unaware of the mechanisms of breathing, namely abdominal or diaphragmatic breathing, and in addition to this, many breathe normally through their mouths. The present study aimed to verify the influence of a short-term breathing exercise program on children's breathing capacity. Twenty-one children aged between 8 and 10 years were selected, from this selection two groups were formed, the control group (CG) with 10 children and the experimental group (EG) with 11. Through a spirometric test, an assessment of breathing capacity (ABC) was carried out for both groups. The GE participated in a program of breathing exercises (BEP) lasting 15 to 20 minutes for 5 weeks. Then, the ABC was performed again for both groups. The results demonstrate a significant increase in the values (p<0.027) of the forced vital capacity (FVC) of the EG, thus suggesting that the application of a BEP promotes the breathing capacity of school-aged children. Further studies should be performed with larger samples and with a longer protocol.

Pulmonary and ventilatory responses to pregnancy, immersion, and exercise

1989 ◽  
Vol 66 (2) ◽  
pp. 857-862 ◽  
Author(s):  
M. J. Berry ◽  
R. G. McMurray ◽  
V. L. Katz
Keyword(s):  
Pulmonary Function ◽  
Forced Vital Capacity ◽  
Vital Capacity ◽  
Minute Ventilation ◽  
Forced Expiratory Volume ◽  
Inspiratory Capacity ◽  
Experimental Conditions ◽  
Ventilatory Responses ◽  
Pregnancy Status ◽  
Duration Of Pregnancy

To examine the effects of pregnancy, immersion, and exercise during immersion on pulmonary function and ventilation, 12 women were studied at 15, 25, and 35 wk of pregnancy and 8–10 wk postpartum. Pulmonary function and ventilation were measured under three experimental conditions: after 20 min of rest on land (LR), after 20 min of rest during immersion to the level of the xiphoid (IR), and after 20 min of exercise during immersion at 60% of predicted maximal capacity (IE). Forced vital capacity remained relatively constant, except for a decrease at 15 wk, for the duration of pregnancy. Expiratory reserve volume decreased with a change in the pregnancy status and with the duration of pregnancy. However, the forced vital capacity was maintained by an increase in the inspiratory capacity during pregnancy. Forced expiratory volume for 1 s, expressed as percent of forced vital capacity, did not differ significantly between conditions or as a result of pregnancy. Forced vital capacity was lower during the IR trial compared with LR and IE trials. The decreased forced vital capacity of the IR trials was mediated by a decrease in the expiratory reserve volume. Whereas the inspiratory capacity increased during IR and IE compared with LR, the increase was not large enough to offset the decrease in the expiratory reserve volume. Resting immersion resulted in a significant decrease in maximal voluntary ventilation as did pregnancy. Pregnancy resulted in significant increases in minute ventilation (VE), which were related to increases in the O2 consumption.(ABSTRACT TRUNCATED AT 250 WORDS)

scholarly journals Effects of the prolonged thoracic epidural analgesia on ventilation function and complication rate after the lung cancer surgery

Medicina ◽  
2006 ◽  
Vol 43 (3) ◽  
pp. 199 ◽  
Author(s):  
Uldis Kopeika ◽  
Immanuels Taivans ◽  
Sanita Ūdre ◽  
Nataļja Jakušenko ◽  
Gunta Strazda ◽  
...  
Keyword(s):  
Postoperative Complications ◽  
Epidural Analgesia ◽  
Forced Vital Capacity ◽  
Complication Rate ◽  
Vital Capacity ◽  
Forced Expiratory Volume ◽  
Thoracic Epidural Analgesia ◽  
Control Group ◽  
Postoperative Complication Rate ◽  
Thoracic Epidural

Thoracic epidural analgesia has been considered to have a good anesthetic efficacy and to decrease the postoperative complication rate, while its effect upon the ventilation function is still the topic of many clinical studies. The aim of this study was to evaluate the course of early postoperative period using thoracic epidural analgesia. Material and methods. A total of 453 patients undergoing the operation due to the non–small cell carcinoma were selected and examined. Their postoperative complications and mortality rate were evaluated. In 79 patients, arterial oxygen saturation (SaO2), forced vital capacity, forced expiratory volume in the first second, and the efficacy of analgesia were analyzed within the first 7 days after the operation. These patients were divided into subgroups according to the type of the operation – lobectomy or pneumonectomy – and the type of analgesia – thoracic epidural analgesia or opiates administered intramuscularly (control group). Results. A better statistically significant efficacy of analgesia was observed in thoracic epidural analgesia group than in the control group (visual analog pain scale score 2.5 versus 5.3, P<0.01). There was also a statistically significant lower incidence of postoperative complications (20.5% versus 38.8%, respectively). Thoracic epidural analgesia is a factor decreasing the relative risk of complications (RR=0.53, 95% CI 0.28–0.99, P=0.0233). In the lobectomy group, 24 hours after the surgery, forced vital capacity was 61±12% in the group receiving thoracic epidural analgesia and 45±13% in the control group (P=0.0152); forced expiratory volume in the first second was 56±17% and 41±11%, respectively (P=0.0308). In the pneumonectomy group, 24 hours after the surgery, forced vital capacity was 47±16% in the group receiving thoracic epidural analgesia, 35±8% in the control group (P=0.080). Forced expiratory volume in the first second was 47±15% and 36±7%, respectively (P=0.0449). Conclusion. We conclude that analgesia with intramuscularly administered opioids provides unsatisfactory analgesia, especially in the first days after the operation. Thoracic epidural analgesia is a safe method, which provides a better quality of life for the patient, decreases the postoperative complication rate, and improves the ventilation function after the lung operations.

scholarly journals Serum 14-3-3β protein: a new biomarker in asthmatic patients with acute exacerbation in an observational study

2021 ◽  
Vol 17 (1) ◽  
Author(s):  
Decai Wang ◽  
Lizong Rao ◽  
Yalan Cui ◽  
Guoting Tang ◽  
Haiming Huang ◽  
...  
Keyword(s):  
Acute Exacerbation ◽  
Normal Control ◽  
Forced Vital Capacity ◽  
Eosinophil Count ◽  
Vital Capacity ◽  
Forced Expiratory Volume ◽  
Normal Control Group ◽  
Control Group ◽  
Clinical Indicators ◽  
Asthmatic Patients

Abstract Background The determination of systemic inflammatory markers is one of the important directions to study the pathogenesis of asthma and improve the diagnosis of asthma. Current studies have found that the 14-3-3 protein family subtypes interact with target proteins to participate in the pathogenesis of a variety of immune inflammatory diseases. However, studies on serum tyrosine3-monooxygenase/tryptophan5-monooxygenase activation protein β (14-3-3β) in asthma are scarce. This study aimed to assess the clinical significance of 14-3-3β in asthmatic patients. Methods We recruited 54 asthmatic patients with acute exacerbation and 50 asthmatic patients with chronic persistent. The normal control group included 54 healthy individuals. Clinical characteristics, clinical indicators [fractional expiratory nitric oxide (FeNO), eosinophil count, forced vital capacity (FVC), percent of predicted FVC (FVC% predicted), forced expiratory volume in one second (FEV1), percent of predicted FEV1 (FEV1% predicted), the ratio of forced expiratory volume in one second to forced vital capacity (FEV1/FVC) and serum 14-3-3β levels were measured to compare among each group. Spearman’s rank correlation coefficient was used to evaluate the correlation between 14-3-3β and clinical indicators. Finally, Receiver-operating characteristic (ROC) curves analysis was used to determine the sensitivity and specificity of 14-3-3β. Results Our results showed that median (interquartile range) of serum 14-3-3β concentration (ng/mL) in acute exacerbation group of asthma (41.18 [33.06–51.76]) was much higher than that in normal control group (24.99 [17.43–29.91]; P < 0.001) and chronic persistent group of asthma (25.88 [21.03–34.55]; P < 0.001). Spearman’s correlation coefficient shows that the serum 14-3-3β level was positively correlated with FeNO (r = − 0.292, P = 0.032) and peripheral blood eosinophil count (r = 0.328, P = 0.016), and was negatively related to FEV1/FVC (r = − 0.293, P = 0.031) in the acute exacerbation group of asthma. At the same time, the serum 14-3-3β level was also negatively associated with FEV1 (r = − 0.297, P = 0.036) in the chronic persistent group of asthma. ROC curve analysis comparing acute exacerbation group of asthma with normal control group demonstrated a significant (P < 0.001) AUC of 0.90 (95% CI 0.85–0.96). Conclusion The serum 14-3-3β protein may become a potential biomarker in asthmatic patients with acute exacerbation.

scholarly journals Pulmonary functions in car air conditioner users and non-air conditioner users in tertiary care centre, South Tamilnadu, India

2019 ◽  
Vol 7 (9) ◽  
pp. 3510
Author(s):  
Hoshea Jeba Ruth S. ◽  
Lisha Vincent
Keyword(s):  
Pulmonary Function ◽  
Forced Vital Capacity ◽  
Vital Capacity ◽  
Pulmonary Function Tests ◽  
Forced Expiratory Volume ◽  
Control Group ◽  
Air Conditioner ◽  
Air Conditioners ◽  
Function Tests ◽  
Expiratory Flow

Background: Air conditioners are used extensively these days of the modern lifestyle. Inhalation of cold dry air while using Air conditioners causes bronchoconstriction due to which alteration may occur in pulmonary function. This study was aimed to compare the Pulmonary Function tests of Car AC users and non AC users. Methods: The Study included 52 employees not exposed to car air conditioner as a control (group I) and 52 employees exposed to car air conditioner  with minimum exposure of 1 hour per day for 6 months as a subject (group II). Pulmonary function tests were performed using computerised spirometer. Statistical analysis was done by unpaired t test.Results: Age, Height and weight are not statistically significant between study group and control group. Forced vital capacity, forced expiratory volume in 1 second, Ratio of Forced vital capacity and Forced expiratory volume in 1 second, Inspiratory reserve volume, Expiratory reserve volume, Maximum voluntary ventilation are decreased in car air conditioner users compared to non-users, but was not significant. Forced expiratory flow (FEF), Peak expiratory flow rate (PEFR) values shows statistically significant decreased in car air conditioner users.Conclusions: The present study shows hyper-responsive airways on exposure to cold air which leads to bronchoconstriction. The significant decrease in PEFR, FEF suggest that upper airways as well as smaller airways are affected on exposure to car AC. So, Exposure to car Air Conditioner leads to risk of developing respiratory dysfunction.

scholarly journals Pulmonary Rehabilitation Accelerates the Recovery of Pulmonary Function in Patients With COVID-19

2021 ◽  
Vol 8 ◽  
Author(s):  
Pengfei Zhu ◽  
Zhengchao Wang ◽  
Xiaomi Guo ◽  
Zhiyong Feng ◽  
Chaochao Chen ◽  
...  
Keyword(s):  
Pulmonary Function ◽  
Pulmonary Rehabilitation ◽  
Vital Capacity ◽  
Ct Scanning ◽  
Forced Expiratory Volume ◽  
Control Group ◽  
Short Term ◽  
Walk Distance ◽  
And Control ◽  
Residual Lesions

Objectives: To evaluate the effect of in-hospital pulmonary rehabilitation (PR) on short-term pulmonary functional recovery in patients with COVID-19.Methods: Patients with COVID-19 (n = 123) were divided into two groups (PR group or Control group) according to recipient of pulmonary rehabilitation. Six-min walk distance (6MW), heart rate (HR), forced vital capacity (FVC), forced expiratory volume in 1 s (FEV1), diffusing capacity of the lung for carbon monoxide (DLCO), and CT scanning were measured at the time of discharge, 1, 4, 12, and 24 weeks.Results: At week one, both PR group and Control group showed no significant changes in pulmonary function. At 4 and 12 weeks, 6MW, HR, FVC, FEV1, and DLCO improved significantly in both groups. However, the improvement in the PR group was greater than the Control group. Pulmonary function in the PR group returned to normal at 4 weeks [FVC (% predicted, PR vs. Control): 86.27 ± 9.14 vs. 78.87 ± 7.55; FEV1 (% predicted, PR vs. Control) 88.76 ± 6.22 vs. 78.96 ± 6.91; DLCO (% predicted, PR vs. Control): 87.27 ± 6.20 vs. 77.78 ± 5.85] compared to 12 weeks in the control group [FVC (% predicted, PR vs. Control): 90.61 ± 6.05 vs. 89.96 ± 4.05; FEV1 (% predicted, PR vs. Control) 94.06 ± 0.43 vs. 93.85 ± 5.61; DLCO (% predicted, PR vs. Control): 91.99 ± 8.73 vs. 88.57 ± 5.37]. Residual lesions on CT disappeared at week 4 in 49 patients in PR group and in 28 patients in control group (p = 0.0004).Conclusion: Pulmonary rehabilitation could accelerate the recovery of pulmonary function in patients with COVID-19.

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