Endurance training reduces end-exercise VO2 and muscle use during submaximal cycling

Michael J. Saunders, Ellen M. Evans, Sigurbjorn A. Arngrimsson, Jerry D. Allison, Kirk J. Cureton

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

Introduction: End-exercise VO2 during heavy, constant-load exercise is reduced after endurance training, due to an attenuated VO2 slow component. Purpose/Methods: To determine whether the training-induced reduction in end-exercise VO1 was associated with reduced muscle use, we measured VO2 and T2 changes in magnetic resonance images in the final minute of two 15-min constant-load cycle rides, one above lactate threshold and the other below lactate threshold. These measures were repeated after a 4-wk period in eight subjects who trained on a cycle ergometer and seven controls. Results: There were no changes in end-exercise VO2 or active muscle after training in either group during low-intensity cycling, in which no VO2 slow component was present. During high-intensity cycling, in which there was a slow component before training, the training group experienced a significant reduction (P < 0.05) in end-exercise VO2 (2625 ± 673; 2567 ± 605 mL·min-1) and the T2 of the vastus lateralis (35.6 ± 1.4; 34.5 ± 0.9 ms). Conclusion: These results support the hypothesis that reduction in end-exercise VO2 (and the VO2 slow component) after training is due to reduced muscle use during heavy, constant load cycling.

Original languageEnglish (US)
Pages (from-to)257-262
Number of pages6
JournalMedicine and Science in Sports and Exercise
Volume35
Issue number2
DOIs
StatePublished - Feb 1 2003

Keywords

  • Magnetic resonance imaging
  • Metabolism
  • Oxygen consumption
  • Oxygenuptake kinetics
  • VO slow component

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

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