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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
This article has been cited by other articles:
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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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