Cited by 190Cardiovascular and exercise physiologyMuscle metabolism and nutritionSports Performance and Training

Disposal of blood [1-13c] lactate in humans during rest and exercise

Mazzeo, R. S., Brooks, G. A., Schoeller, D. A., Budinger, T. F.·1986·Journal of Applied Physiology

Abstract

Lactate irreversible disposal (RiLa) and oxidation (RoxLa) rates were studied in six male subjects during rest (Re), easy exercise [EE, 140 min of cycling at 50% of maximum O2 consumption (VO2max)] and hard exercise (HE, 65 min at 75% VO2max). Twenty minutes into each condition, subjects received a Na+-L(+)-[1-13C]lactate intravenous bolus injection. Blood was sampled intermittently from the contralateral arm for metabolite levels, acid-base status, and enrichment of 13C in lactate. Expired air was monitored continuously for determination of respiratory parameters, and aliquots were collected for determination of 13C enrichment in CO2. Steady-rate values for O2 consumption (VO2) were 0.33 +/- 0.01, 2.11 +/- 0.03, and 3.10 +/- 0.03 l/min for Re, EE, and HE, respectively. Corresponding values of blood lactate levels were 0.84 +/- 0.01, 1.33 +/- 0.05, and 4.75 +/- 0.28 mM in the three conditions. Blood lactate disposal rates were significantly correlated to VO2 (r = 0.78), averaging 123.4 +/- 20.7, 245.5 +/- 40.3, and 316.2 +/- 53.7 mg X kg-1 X h-1 during Re, EE, and HE, respectively. Lactate oxidation rate was also linearly related to VO2 (r = 0.81), and the percentage of RiLa oxidized increased from 49.3% at rest to 87.0% during exercise. A curvilinear relationship was found between RiLa and blood lactate concentration. It was concluded that, in humans, 1) lactate disposal (turnover) rate is directly related to the metabolic rate, 2) oxidation is the major fate of lactate removal during exercise, and 3) blood lactate concentration is not an accurate indicator of lactate disposal and oxidation.

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Crossref · 10.1152/jappl.1986.60.1.232

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  • Most lactate disposal occurs via oxidation in working skeletal muscle during prolonged endurance exercise, but other tissues such as the brain, liver and kidneys are also involved in lactate turnover.

    “Most lactate disposal occurs via oxidation in working skeletal muscle during prolonged endurance exercise, but other tissues such as the brain, liver and kidneys are also involved in lactate turnover [121,122,123].”

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Authors
Mazzeo, R. S., Brooks, G. A., Schoeller, D. A., & Budinger, T. F.
Venue
Journal of Applied Physiology
Published
1986-01-01
Volume
60
Issue
1
Pages
232-241
ISSN
  • 0161-7567 (ISSN-L)
  • 8750-7587
  • 1522-1601
OpenAlex
W1952016433
Cited by
189
References
0
Citations by year
2026: 4 · 2025: 2 · 2024: 13 · 2023: 1 · 2022: 8 · 2021: 9 · 2020: 10 · 2019: 3 · 2018: 3 · 2017: 3 · 2016: 8 · 2015: 7 · 2014: 10 · 2013: 9 · 2012: 8
FWCI
12.43
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Applied Physiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institutes of Health (AM-195 77)
Topics
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
  • Health Sciences › Medicine › Orthopedics and Sports Medicine › Sports Performance and Training
Keywords
blood lactate, lactate oxidation, physical activity, oxygen consumption, blood lactate concentration, metabolic rate, acid-base status, cycling exercise
MeSH terms
Adult, Bicarbonates, Blood Glucose, Carbon Dioxide, Carbon Isotopes, Physical Exertion, Homeostasis, Humans, Lactates, Male, Metabolic Clearance Rate, Oxidation-Reduction, Oxygen Consumption, Respiration, Rest

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