Cited by 967Cardiovascular and exercise physiologySports Performance and TrainingMuscle metabolism and nutrition

Human muscle metabolism during intermittent maximal exercise

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Gaitanos, G. C., Williams, C., Boobis, L. H., Brooks, S.·1993·Journal of Applied Physiology

Abstract

Eight male subjects volunteered to take part in this study. The exercise protocol consisted of ten 6-s maximal sprints with 30 s of recovery between each sprint on a cycle ergometer. Needle biopsy samples were taken from the vastus lateralis muscle before and after the first sprint and 10 s before and immediately after the tenth sprint. The energy required to sustain the high mean power output (MPO) that was generated over the first 6-s sprint (870.0 +/- 159.2 W) was provided by an equal contribution from phosphocreatine (PCr) degradation and anaerobic glycolysis. Indeed, within the first 6-s bout of maximal exercise PCr concentration had fallen by 57% and muscle lactate concentration had increased to 28.6 mmol/kg dry wt, confirming significant glycolytic activity. However, in the tenth sprint there was no change in muscle lactate concentration even though MPO was reduced only to 73% of that generated in the first sprint. This reduced glycogenolysis occurred despite the high plasma epinephrine concentration of 5.1 +/- 1.5 nmol/l after sprint 9. In face of a considerable reduction in the contribution of anaerobic glycogenolysis to ATP production, it was suggested that, during the last sprint, power output was supported by energy that was mainly derived from PCr degradation and an increased aerobic metabolism.

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Crossref · 10.1152/jappl.1993.75.2.712

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Authors
Gaitanos, G. C., Williams, C., Boobis, L. H., & Brooks, S.
Affiliations
Loughborough University (GB)
Venue
Journal of Applied Physiology
Published
1993-08-01
Volume
75
Issue
2
Pages
712-719
ISSN
  • 0161-7567 (ISSN-L)
  • 8750-7587
  • 1522-1601
OpenAlex
W2149069857
Cited by
967
References
24
Citations by year
2026: 24 · 2025: 38 · 2024: 35 · 2023: 22 · 2022: 53 · 2021: 44 · 2020: 35 · 2019: 39 · 2018: 38 · 2017: 39 · 2016: 39 · 2015: 52 · 2014: 62 · 2013: 59 · 2012: 35
FWCI
30.99
Type
journal article
Language
en
Open access
Licence
cc-by-nc-nd
Locations
  • Journal of Applied Physiology (publishedVersion)
  • PubMed (publishedVersion)
  • OpenGrey (Institut de l'Information Scientifique et Technique) (submittedVersion)
  • Loughborough University Institutional Repository (Loughborough University) (submittedVersion, cc-by-nc-nd)
  • Loughborough University Research Repository (Loughborough University) (submittedVersion, cc-by-nc-nd)
Topics
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
  • Health Sciences › Medicine › Orthopedics and Sports Medicine › Sports Performance and Training
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
Keywords
muscle metabolism, sprint exercise, anaerobic glycolysis, muscle lactate, glycogenolysis, epinephrine, aerobic metabolism, output power, vastus lateralis, energy substrate utilization
MeSH terms
Adenosine Triphosphate, Adult, Blood Glucose, Blood Volume, Energy Metabolism, Epinephrine, Exercise Test, Glycogen, Humans, Hydrogen-Ion Concentration, Lactates, Male, Muscles, Norepinephrine, Oxygen Consumption, Phosphocreatine, Exercise, Lactic Acid

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