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- W2170068045 abstract "We investigated arm perfusion and metabolism during upper body exercise. Eight average, fit subjects and seven rowers, mean ± SE maximal oxygen uptake (V̇o 2 max ) 157 ± 7 and 223 ± 14 ml O 2 · kg –0.73 ·min –1 , respectively, performed incremental arm cranking to exhaustion. Arm blood flow (ABF) was measured with thermodilution and arm muscle mass was estimated by dual-energy X-ray absorptiometry. During maximal arm cranking, pulmonary V̇o 2 was ∼45% higher in the rowers compared with the untrained subjects and peak ABF was 6.44 ± 0.40 and 4.55 ± 0.26 l/min, respectively ( P < 0.05). The arm muscle mass for the rowers and the untrained subjects was 3.5 ± 0.4 and 3.3 ± 0.1 kg, i.e., arm perfusion was 1.9 ± 0.2 and 1.4 ± 0.1 l blood·kg –1 ·min –1 , respectively ( P < 0.05). The arteriovenous O 2 difference was 156 ± 7 and 120 ± 8 ml/l, respectively, and arm V̇o 2 was 0.98 ± 0.08 and 0.60 ± 0.04 l/min corresponding with 281 ± 22 and 181 ± 12 ml/kg, while arm O 2 diffusional conductance was 49.9 ± 4.3 and 18.6 ± 3.2 ml·min –1 ·mmHg –1 , respectively ( P < 0.05). Also, lactate release in the rowers was almost three times higher than in the untrained subjects (26.4 ± 1.1 vs. 9.5 ± 0.4 mmol/min, P < 0.05). The energy requirement of an ∼50% larger arm work capacity after long-term arm endurance training is covered by an ∼60% increase in aerobic metabolism and an almost tripling of the anaerobic capacity." @default.
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- W2170068045 date "2004-05-01" @default.
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- W2170068045 title "Effect of fitness on arm vascular and metabolic responses to upper body exercise" @default.
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- W2170068045 doi "https://doi.org/10.1152/ajpheart.01001.2003" @default.
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