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Relationship between minute ventilation (V̇e) and O2 uptake (V̇o2) (A) and between CO2 output (V̇co2) and V̇o2 (B). Linear regression equations through pooled data: V̇e = 14.15V̇o2 + 426.0, R2 = 0.74, and V̇co2 = 0.920V̇o2 + 0.383, R2 = 0.93.
