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Stratification by V\u0307e\/V\u0307co\n                    <jats:sub>2<\/jats:sub>\n                    demonstrates that interindividual differences in V\u0307e\/V\u0307co\n                    <jats:sub>2<\/jats:sub>\n                    were driven by changes in effective alveolar ventilation. These results support the view that [Formula: see text] stability is apparent during exercise. 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