The effect of exercise intensity on the slow component of V̇O2 in persons of different fitness levels

D. J. Jacobsen, Richard J Coast, J. E. Donnelly

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Objectives. To evaluate the slow component of V̇O2 in persons of different fitness levels exercising at different intensities and the contribution of proposed mediators to the slow component of V̇O2 using equations from the literature. Experimental design. Cross-sectional. Setting. University. Participants. Low (N=15) and high (N=15) fitness (V̇O2max of 37 vs 62 ml · min-1 · kg-1). Interventions. None. Measures. Each subject completed, in random order, a series of 12 rain cycle ergometer exercise trials corresponding to 50, 60, 70 and 80% of V̇O2max. V̇O2, minute ventilation (MV), blood lactate (BL), rectal temperature (RT), heart rate and blood pressure were measured. Results. There was a significant (p<0.05) increase in the slow component of V̇O2 for each level of fitness across time and at each workrate. There were no between group differences for any variable. The increase in the slow component of V̇O2 ranged from 70 ml · min-1 for the lighter workrates to 543 ml · min-1 for the high fitness group at 80% of maximal V̇O2 (both p<0.05). The oxygen cost of MV, RT and rate pressure product accounted for about 50% of the observed increase in the slow component of V̇O2. MV appears to increase in a pattern most similar to the slow component of V̇O2 and the oxygen cost of MV generally accounted for the highest percentage of the observed increase. Conclusions. The slow component of V̇O2 needs to be considered when prescribing exercise. These results are not conclusive concerning the primary mediators of the slow component of V̇O2.

Original languageEnglish (US)
Pages (from-to)124-131
Number of pages8
JournalJournal of Sports Medicine and Physical Fitness
Volume38
Issue number2
StatePublished - Jun 1998

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Ventilation
Oxygen
Costs and Cost Analysis
Temperature
Rain
Lactic Acid
Research Design
Heart Rate
Blood Pressure
Pressure

Keywords

  • Exercise physiology
  • Oxygen consumption
  • Pulmonary gas exchange

ASJC Scopus subject areas

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

Cite this

The effect of exercise intensity on the slow component of V̇O2 in persons of different fitness levels. / Jacobsen, D. J.; Coast, Richard J; Donnelly, J. E.

In: Journal of Sports Medicine and Physical Fitness, Vol. 38, No. 2, 06.1998, p. 124-131.

Research output: Contribution to journalArticle

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abstract = "Objectives. To evaluate the slow component of V̇O2 in persons of different fitness levels exercising at different intensities and the contribution of proposed mediators to the slow component of V̇O2 using equations from the literature. Experimental design. Cross-sectional. Setting. University. Participants. Low (N=15) and high (N=15) fitness (V̇O2max of 37 vs 62 ml · min-1 · kg-1). Interventions. None. Measures. Each subject completed, in random order, a series of 12 rain cycle ergometer exercise trials corresponding to 50, 60, 70 and 80{\%} of V̇O2max. V̇O2, minute ventilation (MV), blood lactate (BL), rectal temperature (RT), heart rate and blood pressure were measured. Results. There was a significant (p<0.05) increase in the slow component of V̇O2 for each level of fitness across time and at each workrate. There were no between group differences for any variable. The increase in the slow component of V̇O2 ranged from 70 ml · min-1 for the lighter workrates to 543 ml · min-1 for the high fitness group at 80{\%} of maximal V̇O2 (both p<0.05). The oxygen cost of MV, RT and rate pressure product accounted for about 50{\%} of the observed increase in the slow component of V̇O2. MV appears to increase in a pattern most similar to the slow component of V̇O2 and the oxygen cost of MV generally accounted for the highest percentage of the observed increase. Conclusions. The slow component of V̇O2 needs to be considered when prescribing exercise. These results are not conclusive concerning the primary mediators of the slow component of V̇O2.",
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