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September 18, 2025Journal of Applied PhysiologyOpen Access

Maximal-effort knee-extension exercise impairs skeletal muscle oxidative capacity and VO2 recovery in vivo

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Authors

MBMiles F. BartlettAOAndrew P. OnegliaDDDelaney Davis

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Overview

Maximal voluntary dynamic contractions reduce VO2 recovery in healthy adults, indicating impaired oxidative capacity in muscle during fatigue.

Key Points

  • VO2 recovery rate constant decreased by about 25% after fatiguing exercise, indicating impaired oxidative capacity.
  • Participants showed an approximate 16% reduction in VO2 recovery during a different measurement method, highlighting exercise fatigue effects.
  • Fatiguing exercise was assessed through isokinetic maximal dynamic contractions and monitored using advanced spectroscopy methods.
  • These findings suggest mitochondrial oxygen consumption becomes uncoupled from muscle power output and ATP demand during fatigue.

Cite This Study

Bartlett et al. (2025) studied this question.

synapsesocial.com/papers/68d435dd713b0b5dfea7562dhttps://doi.org/10.1152/japplphysiol.00517.2025
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1Acute knee extensor torque and muscle oxygenation responses to isometric testing in exercise and non‐exercised legs of male adults2025 · 1 citations
  2. 2Skeletal muscle energetics during submaximal contractions are linked to metabolic performance during ambulatory exercise: A pilot study in male adults2025
  3. 3Muscle Oxygenation during Prolonged Concentric and Eccentric Exercises in Well-trained Males2025
  4. 4Impaired oxygen consumption kinetics and autonomic dysfunction contribute to increased fatigue in obese young males during sustained exercise2025
  5. 5Association between muscle oxygenation dynamics and cardiac workload and ventilation during exercise.2025