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Physical training fails to improve ventilatory muscle endurance in patients with chronic obstructive pulmonary disease
Belman MJ, Kendregan BA
Chest 1982 Apr;81(4):440-443
clinical trial
4/10 [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: No; Between-group comparisons: No; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

We examined the effect of arm and leg exercise training on ventilatory muscle performance in 15 patients with symptomatic COPD. Eight patients trained their arms while seven trained their legs for six weeks. Before and after the training we measured exercise and pulmonary function including the maximal sustained ventilatory capacity (MSVC). After training there was no significant change in spirometric values and lung volumes. The mean endurance workload performed for 20 minutes increased significantly in both the arm and leg trained groups (14.4 +/- 2.4 to 24.8 +/- 2.5 W, p < 0.01, and 26.1 +/- 2.4 to 44.4 +/- 2.5 W, p < 0.01, respectively). Despite the increase in endurance, no significant change was noted in the MSVC (46 +/- 5 to 51 +/- 5 for the arm trainers and 36 +/- 2 to 39 +/- 1 for the leg trainers). We conclude that nonventilatory muscle exercise such as arm and leg cycling does not improve ventilatory muscle endurance, and that increased exercise endurance may occur independent of changes in ventilatory muscle endurance.

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