Document Detail

Activation of the Prefrontal Cortex Is Associated with Exertional Dyspnea in Chronic Obstructive Pulmonary Disease.
MedLine Citation:
PMID:  21474913     Owner:  NLM     Status:  Publisher    
Background: Exertional dyspnea is the primary symptom that limits exercise in patients with chronic obstructive pulmonary disease (COPD). It is unknown which activated brain area is associated with this symptom in COPD patients. Objectives: To investigate the activation of cortical areas associated with dyspnea during exercise in COPD patients. Methods: COPD patients (n = 10) and age-matched controls (n = 10) performed mild-intensity constant work rate cycle exercise (40% of their symptom-limited peak work rates) for 10 min, while cerebral hemodynamics and oxygenation were measured by near-infrared spectroscopy (NIRS). Ventilatory responses (breathing pattern and pulmonary gas exchange) and Borg scale ratings of dyspnea and leg fatigue were measured during exercise. Three NIRS probes were placed over the prefrontal and temporoparietal cortical regions of the subjects' heads. Changes in cortical oxyhemoglobin (oxy-Hb), deoxyhemoglobin (deoxy-Hb), and total hemoglobin (total Hb) concentrations from baseline recordings were measured. Increased oxy-Hb (oxygenation) was assumed to reflect cortical activation. Results: Oxy-Hb concentration was significantly increased in the prefrontal region during exercise in both groups but not in the temporoparietal regions. The change in prefrontal oxy-Hb concentration of COPD patients was not different from that of controls. Dyspnea scores were positively correlated with changes in oxy-Hb concentrations of the prefrontal regions in both groups. Multivariate analysis showed that oxy-Hb concentration in the prefrontal region was the best predictor of dyspnea in both groups. Conclusions: Exertional dyspnea was related to activation (oxygenation) of the prefrontal cortex in COPD patients and control subjects.
Yuji Higashimoto; Noritsugu Honda; Toshiyuki Yamagata; Toshiki Matsuoka; Kazushige Maeda; Rhyuji Satoh; Osamu Nishiyama; Hiroyuki Sano; Takashi Iwanaga; Takayuki Miyara; Masato Muraki; Katsuyuki Tomita; Hiroaki Kume; Ichiro Miyai; Yuji Tohda; Kanji Fukuda
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-4-07
Journal Detail:
Title:  Respiration; international review of thoracic diseases     Volume:  -     ISSN:  1423-0356     ISO Abbreviation:  -     Publication Date:  2011 Apr 
Date Detail:
Created Date:  2011-4-8     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0137356     Medline TA:  Respiration     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 S. Karger AG, Basel.
Department of Rehabilitation Medicine, Kinki University, Faculty of Medicine, Osaka, Japan.
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