Cited by 205Cardiovascular and exercise physiologySports Performance and TrainingMuscle metabolism and nutrition

Systematic analysis of adaptations in aerobic capacity and submaximal energy metabolism provides a unique insight into determinants of human aerobic performance.

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Vollaard, Niels B. J., Constantin-Teodosiu, Dimitru, Fredriksson, Katarina, Rooyackers, Olav, Jansson, Eva, Greenhaff, Paul L., Timmons, James A., Sundberg, Carl Johan·2009·Journal of Applied Physiology

Abstract

It has not been established which physiological processes contribute to endurance training-related changes (Δ) in aerobic performance. For example, the relationship between intramuscular metabolic responses at the intensity used during training and improved human functional capacity has not been examined in a longitudinal study. In the present study we hypothesized that improvements in aerobic capacity (V̇o 2max) and metabolic control would combine equally to explain enhanced aerobic performance. Twenty-four sedentary males (24 ± 2 yr; 1.81 ± 0.08 m; 76.6 ± 11.3 kg) undertook supervised cycling training (45 min at 70% of pretraining V̇o 2max) 4 times/wk for 6 wk. Performance was determined using a 15-min cycling time trial, and muscle biopsies were taken before and after a 10-min cycle at 70% of pretraining V̇o 2max to quantify substrate metabolism. Substantial interindividual variability in training-induced adaptations was observed for most parameters, yet “low responders” for ΔV̇o 2max were not consistently low responders for other variables. While V̇o 2max and time trial performance were related at baseline ( r 2= 0.80, P < 0.001), the change in V̇o 2max was completely unrelated to the change in aerobic performance. The maximal parameters ΔV̇e max and ΔVeq max(ΔV̇e/V̇o 2max) accounted for 64% of the variance in ΔV̇o 2max( P < 0.001), whereas Δperformance was related to changes in the submaximal parameters Veq submax( r 2= 0.33; P < 0.01), muscle Δlactate ( r 2= 0.32; P < 0.01), and Δacetyl-carnitine ( r 2= 0.29; P < 0.05). This study demonstrates that improvements in high-intensity aerobic performance in humans are not related to altered maximal oxygen transport capacity. Altered muscle metabolism may provide the link between training stimulus and improved performance, but metabolic parameters do not change in a manner that relates to aerobic capacity changes.

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Crossref · 10.1152/japplphysiol.91453.2008

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  • Using a fixed percentage of a maximally achievable value of oxygen uptake or heart rate involves a considerable amount of interindividual heterogeneity in other markers of internal load, such as metabolic responses objectified by peripheral blood lactate.

    “Using a fixed percentage of a maximally achievable value of oxygen uptake or heart rate involves a considerable amount of interindividual heterogeneity in other markers of internal load (e.g., metabolic responses objectified by, for instance, peripheral blood lactate)”

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Authors
Vollaard, N. B. J., Constantin-Teodosiu, D., Fredriksson, K., Rooyackers, O., Jansson, E., Greenhaff, P. L., Timmons, J. A., & Sundberg, C. J.
Affiliations
  • Stockholm University (SE)
  • Karolinska University Hospital (SE)
  • University of Nottingham (GB)
  • Karolinska Institutet (SE)
Corresponding author
Timmons, James A.
Venue
Journal of Applied Physiology
Published
2009-05
Volume
106
Issue
5
Pages
1479-1486
ISSN
  • 0161-7567 (ISSN-L)
  • 8750-7587
  • 1522-1601
OpenAlex
W2121236814
Cited by
205
References
55
Citations by year
2026: 2 · 2025: 6 · 2024: 12 · 2023: 8 · 2022: 9 · 2021: 11 · 2020: 12 · 2019: 18 · 2018: 13 · 2017: 19 · 2016: 14 · 2015: 14 · 2014: 13 · 2013: 16 · 2012: 8
FWCI
30.14
Type
journal article
Language
en
Open access
Licence
public-domain
Locations
  • Journal of Applied Physiology (publishedVersion)
  • PubMed (publishedVersion)
  • Stirling Online Research Repository (University of Stirling) (submittedVersion, public-domain)
  • Research at the University of Copenhagen (University of Copenhagen) (submittedVersion)
Funders
Pfizer
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
cardiorespiratory fitness, endurance training, aerobic performance, substrate metabolism, muscle lactate, acetyl-L-carnitine, cycling time trial, training-induced adaptations, interindividual variability, sedentary men
MeSH terms
Acetylcarnitine, Adaptation, Physiological, Adenosine Triphosphatases, Adult, Biopsy, Citrate (si)-Synthase, Electron Transport Complex IV, Energy Metabolism, Exercise Test, Humans, Male, Oxygen Consumption, Exercise, Polymerase Chain Reaction, Lactic Acid, Electron Transport Complex I, Quadriceps Muscle, Young Adult

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