Abstract:
RATIONALE:Exercise-induced bronchoconstriction (EIB) increases in cold and dry air and decreases in humid air in subjects with asthma. Few reports have reported on the effect of humid environment upon exercise capacity in subjects with EIB. OBJECTIVE:The primary aim of the present study was to examine the effect of changing the humidity of the environmental air upon exercise capacity measured by peak oxygen uptake (V O2 peak), peak ventilation (V Epeak) and peak running speed (V peak) and secondarily to assess the influence of environmental humidity upon EIB in subjects suffering from EIB. METHODS:Twenty subjects (10-45 years old, male/female:13/7) with diagnosed EIB performed exercise testing under standardised, regular environmental conditions, 20.2 degrees C (+/- 1.1) and 40% (+/- 3.3) relative humidity [mean (+/- SD)], and under standardised humid environmental conditions; 19.9 degrees C (+/- 1.0) and 95% (+/- 1.7) relative humidity in random order on separate days. Lung function was measured before and 1, 3, 6, 10 and 15 min after exercise. Heart rate (HR), oxygen uptake (V O2), respiratory gas exchange ratio (RER), breathing frequency (BF) and minute ventilation (V E) were measured during exercise. RESULTS:V O2 peak and V peak increased significantly from 40% to 95% relative humidity of the environmental air, 4.5% and 5.9%, respectively (P = 0.001). HRpeak increased significantly in the humid environment, while BF(peak) decreased significantly. RERpeak and V Epeak did not change significantly. Post-exercise reduction in FEV1 (DeltaFEV1) and FEF50 (forced expiratory flow at 50% of FVC) (DeltaFEF50) significantly decreased after exercise in a humid environment as compared to regular conditions, DeltaFEV1: 12% (7,17) vs. 24% (19,29) [mean (95% confidence intervals)], respectively, DeltaFEF50: 20% (12,29) vs. 38% (30,46), respectively (P < 0.001). CONCLUSION:Exercise capacity (V O2 peak and V peak) markedly improved during exercise in humid air in subjects with EIB, whereas EIB was reduced to the half.
journal_name
Respir Medjournal_title
Respiratory medicineauthors
Stensrud T,Berntsen S,Carlsen KHdoi
10.1016/j.rmed.2005.12.001subject
Has Abstractpub_date
2006-09-01 00:00:00pages
1633-41issue
9eissn
0954-6111issn
1532-3064pii
S0954-6111(05)00524-Xjournal_volume
100pub_type
杂志文章,随机对照试验abstract::Airway dehydration and subsequent hyperosmolarity of periciliary fluid are considered critical events in exercise-induced bronchoconstriction (EIB). It has been shown that an in vitro hyperosmolar stimulation of basophils and mast cells with mannitol can induce the release of histamine and leukotrienes. The aim of thi...
journal_title:Respiratory medicine
pub_type: 杂志文章
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更新日期:2003-08-01 00:00:00
abstract:BACKGROUND AND OBJECTIVE:Idiopathic pulmonary fibrosis (IPF) is a progressive and irreversible interstitial lung disease with poor prognosis despite the recent availability of two antifibrotic drugs. Patients are more susceptible to cardiovascular comorbidities. In this study, we aimed to determine the impact of concom...
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更新日期:2020-11-26 00:00:00
abstract:BACKGROUND:The optimal initial management of primary spontaneous pneumothorax (PSP) remains controversial. This study was to evaluate the safety and efficacy of intrapleural minocycline following aspiration for initial treatment of PSP. METHODS:Between January 2004 and November 2006, 64 patients with a first episode o...
journal_title:Respiratory medicine
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abstract::The prevalence of tuberculosis in small solitary lesions of the lung obtained by video-assisted thoracoscopic surgery (VATS) is still unclear. Of 103 lung lesions resected by VATS in 98 patients (47 men, 51 women), 19 were identified macroscopically as inflammatory changes, 78 were neoplastic, and 6 were undefined. Pr...
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abstract:BACKGROUND:Familial dysautonomia (Riley-Day syndrome, hereditary sensory autonomic neuropathy type-III) is a rare genetic disease caused by impaired development of sensory and afferent autonomic nerves. As a consequence, patients develop neurogenic dysphagia with frequent aspiration, chronic lung disease, and chemorefl...
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pub_type: 临床试验,杂志文章,随机对照试验
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abstract::Obstructive sleep apnoea syndrome (OSAS) has acute and chronic effects on the cardiovascular system. Both right and left sides of the heart are affected. Electrocardiographic pattern was studied in 190 OSAS patients. One or more of the following were found: persistent deep S in lateral chest leads V5, V6 (79%), left a...
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abstract::This double-blind, placebo-controlled, crossover study was performed to evaluate the effect of terbutaline administered by a turbuhaler on spirometry, walking distance and dyspnoea during exercise in patients with chronic obstructive lung disease (COLD) and to evaluate relationships between changes in spirometry and w...
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pub_type: 临床试验,杂志文章,随机对照试验
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pub_type: 杂志文章,多中心研究,随机对照试验
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更新日期:2018-06-01 00:00:00
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abstract::Lung function (FEV1 before and after bronchodilatation) was studied prospectively over five visits in 55 asthmatic children (28 boys) from childhood to adulthood (age 30). At the last follow-up recordings were made at rest, after cold air challenge (CACh), and after bronchodilatation. Results were related to clinical ...
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pub_type: 杂志文章
doi:10.1053/rmed.1999.0763
更新日期:2000-05-01 00:00:00
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pub_type: 杂志文章,多中心研究,随机对照试验
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