Journal of Applied Physiology  AJP: Regulatory, Integrative and Comparative Physiology
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J Appl Physiol 90: 1307-1313, 2001;
8750-7587/01 $5.00
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Vol. 90, Issue 4, 1307-1313, April 2001

Lactate removal is not enhanced in nonstimulated perfused skeletal muscle after endurance training

Ken D. Sumida1 and Casey M. Donovan2

1 Department of Biological Sciences, Chapman University, Orange 92866; and 2 Department of Kinesiology, University of Southern California, Los Angeles, California 90089-0652

The effects of endurance training (running 40 m/min, 10% grade for 60 min, 5 days/wk for 8 wk) on skeletal muscle lactate removal was studied in rats by utilizing the isolated hindlimb perfusion technique. Hindlimbs were perfused (single-pass) with Krebs-Henseleit bicarbonate buffer, fresh bovine erythrocytes (hematocrit ~30%), 10 mM lactate, and [U-14C]lactate (30,000 dpm/ml). Arterial and venous blood samples were collected every 10 min for the duration of the experiment to assess lactate uptake. During perfusions, no significant differences in skeletal muscle lactate uptake were observed between trained (7.31 ± 0.20 µmol/min) and control hindlimbs (6.98 ± 0.43 µmol/min). In support, no significant differences were observed for [14C]lactate uptake in trained (22,776 ± 370 dpm/min) compared with control hindlimbs (21,924 ± 1,373 dpm/min). Concomitant with these observations, no significant differences were observed between groups for oxygen consumption (4.93 ± 0.18 vs. 4.92 ± 0.13 µmol/min), net skeletal muscle glycogen synthesis (7.1 ± 0.4 vs. 6.5 ± 0.3 µmol · 40 min-1 · g-1), or 14CO2 production (2,203 ± 185 vs. 2,098 ± 155 dpm/min), trained and control, respectively. These findings indicate that endurance training does not affect lactate uptake or alter the metabolic fate of lactate in quiescent skeletal muscle.

lactate oxidation; fiber types; glyconeogenesis; [14C]lactate; [14C]glycogen


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K. M. Kelley, J. J. Hamann, C. Navarre, and L. B. Gladden
Lactate metabolism in resting and contracting canine skeletal muscle with elevated lactate concentration
J Appl Physiol, September 1, 2002; 93(3): 865 - 872.
[Abstract] [Full Text] [PDF]




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