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Atom percent excess (APE) of expired 13CO2 during rest and exercise. Values are means ± SE, n = 6, for untrained (UT) and trained (T) groups. ^Significantly different from rest within condition (P < 0.05); £significantly different from T lactate threshold (LT; P < 0.05); †significantly different from T-LT−10% (P < 0.05). LC, lactate clamp.
