Abstract：
:To evaluate whether respiratory factors limit exercise capacity in patients with mild cystic fibrosis (CF) lung disease (mean FEV(1) = 76 +/- 7.7% predicted) we stressed the respiratory system of seven patients using added dead space (V(D)). Primary outcomes were exercise duration (Ex(dur)) and maximal oxygen uptake (VO(2max)). Dyspnoea/leg-discomfort were assessed at end-exercise. Ex(dur) was identical between control and V(D) studies (520 +/- 152 versus 511 +/ -166 s, p = NS) as was VO(2max)(1.6 +/- 0.5 versus 1.6 +/- 0.6 L/min, p = NS). Significant resting, sub-maximal and maximal workload increases in minute ventilation (V(E)) were detected (70.8 +/- 13.7 versus 79.5 +/- 16.9 L/min, p < 0.05). Analysis of breathing pattern revealed increases in V(E) were attributable to increases in tidal volume (2.0 +/- 0.5 versus 2.2 +/- 0.6 L, p < 0.05) with no change in respiratory frequency. There was no difference in dyspnoea/leg discomfort between tests. The increase in V(E) in response to V(D), with no change in [Exdur/VO(2max) suggests maximal symptom-limited exercise limitation is not primarily limited by respiratory factors in mild CF lung disease. Focused investigation and treatment of non-respiratory factors contributing to exercise limitation may improve exercise rehabilitation in this patient group.
journal_name
Respir Physiol Neurobioljournal_title
Respiratory physiology & neurobiologyauthors
Dodd JD,Barry SC,Gallagher CGdoi
10.1016/j.resp.2005.08.003keywords:
subject
Has Abstractpub_date
2006-06-01 00:00:00pages
176-85issue
2eissn
1569-9048issn
1878-1519pii
S1569-9048(05)00210-7journal_volume
152pub_type
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journal_title：Respiratory physiology & neurobiology
pub_type： 杂志文章
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journal_title：Respiratory physiology & neurobiology
pub_type： 杂志文章
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journal_title：Respiratory physiology & neurobiology
pub_type： 杂志文章
doi：10.1016/j.resp.2004.04.012
更新日期：2004-07-20 00:00:00
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pub_type： 杂志文章
doi：10.1016/j.resp.2016.06.003
更新日期：2016-10-01 00:00:00
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pub_type： 杂志文章
doi：10.1016/j.resp.2009.04.026
更新日期：2009-07-31 00:00:00
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journal_title：Respiratory physiology & neurobiology
pub_type： 临床试验,杂志文章
doi：10.1016/j.resp.2004.01.004
更新日期：2004-04-20 00:00:00
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journal_title：Respiratory physiology & neurobiology
pub_type： 杂志文章,评审
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更新日期：2010-04-15 00:00:00
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journal_title：Respiratory physiology & neurobiology
pub_type： 杂志文章,评审
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journal_title：Respiratory physiology & neurobiology
pub_type： 杂志文章
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journal_title：Respiratory physiology & neurobiology
pub_type： 杂志文章
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