Influence of endurance training and catecholamines on exercise V̇O2 response

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Abstract

For constant-load, heavy exercise (i.e., above the lactate threshold (T(Lac))), a slow component of oxygen uptake (V̇O2) is observed. Endurance training reduces the magnitude of the slow component and, hence, end-exercise V̇O2. Reductions in exercise V̇O2 have been reported after 7-8 wk of training; unpublished observations suggest that the V̇O2 slow component may be attenuated after just 2 wk of training. A minimum training intensity for eliciting reductions in constant-load exercise V̇O2 has not been established; however, in the elderly, training at an intensity below T(Lac) resulted in similar reductions in exercise V̇O2 as did training above T(Lac). Mechanisms responsible for the reduced slow component of V̇O2 after training remain to be firmly established. Evidence both for and against blood lactate concentration ([L-]) as a mediator of the slow component has been published; high correlations between [L-] and the slow component, and between the training-induced reductions in these variables, appear to be more coincidental than causal. Decreased pulmonary ventilation after training may account for between 14% and 30% of the reduction in the slow component of V̇O2. Epinephrine infusion does not augment exercise V̇O2, nor does β- adrenergic blockade diminish the magnitude of the slow component of V̇O2.

Original languageEnglish (US)
Pages (from-to)1341-1346
Number of pages6
JournalMedicine and Science in Sports and Exercise
Volume26
Issue number11
StatePublished - 1994
Externally publishedYes

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Catecholamines
Exercise
Lactic Acid
Pulmonary Ventilation
Adrenergic Agents
Epinephrine
Oxygen

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Public Health, Environmental and Occupational Health
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

Influence of endurance training and catecholamines on exercise V̇O2 response. / Gaesser, Glenn.

In: Medicine and Science in Sports and Exercise, Vol. 26, No. 11, 1994, p. 1341-1346.

Research output: Contribution to journalArticle

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