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Effect of ventilation-feedback training on endurance and perceived breathlessness during constant work-rate leg-cycle exercise in patients with COPD
Collins EG, Fehr L, Bammert C, O'Connell S, Laghi F, Hanson K, Hagarty E, Langbein WE
Journal of Rehabilitation Research and Development 2003 Sep-Oct;40(5 Suppl 2):35-44
clinical trial
6/10 [Eligibility criteria: No; Random allocation: Yes; Concealed allocation: No; Baseline comparability: Yes; Blind subjects: No; Blind therapists: No; Blind assessors: No; Adequate follow-up: Yes; Intention-to-treat analysis: Yes; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

The purpose of this study was to evaluate the efficacy of a unique program of ventilation-feedback training combined with leg-cycle exercise to improve exertional endurance and decrease perceived dyspnea in patients with chronic obstructive pulmonary disease (COPD). Thirty-nine patients (67.5 +/- 8.1 yr of age) with moderate to severe COPD (42.6% of predicted forced expiratory volume in 1 s) were randomized to one of three 6-week experimental interventions: ventilation-feedback with exercise (V+EX), exercise only (EX-ONLY), or ventilation-feedback only (VF-ONLY). At baseline and at 6 weeks, patients completed a constant work-rate leg-cycle ergometer test at 85 percent of maximal power output. There were increases within the groups in exercise duration: 11.5 min (103%), 8.0 min (66%), and 0.4 min (4%) for the VF+EX, EX-ONLY and VF-ONLY groups, respectively. The VF-ONLY group experienced no significant within-group changes in selected gas exchange parameters. However, there were significant (p < 0.05) posttraining changes in minute ventilation, tidal volume, breathing frequency (f), and expiratory time (Te) in the VF(+EX) group, and in f and Te in the EX(ONLY) group. After completing the training, VF+EX and EX-ONLY patients reported less breathlessness and perceived exertion (p < 0.05). The VF-ONLY patients' ratings changed in the hypothesized direction but were not significant. Based on these preliminary data, VF+EX and EX-ONLY were equally effective in improving leg-cycle exercise tolerance in patients with moderate to severe COPD.

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