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 language | English (US) |
|---|---|
| Pages (from-to) | 124-131 |
| Number of pages | 8 |
| Journal | Journal of Sports Medicine and Physical Fitness |
| Volume | 38 |
| Issue number | 2 |
| State | Published - Jun 1998 |
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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 journal › Article
}
TY - JOUR
T1 - The effect of exercise intensity on the slow component of V̇O2 in persons of different fitness levels
AU - Jacobsen, D. J.
AU - Coast, Richard J
AU - Donnelly, J. E.
PY - 1998/6
Y1 - 1998/6
N2 - 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.
AB - 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.
KW - Exercise physiology
KW - Oxygen consumption
KW - Pulmonary gas exchange
UR - http://www.scopus.com/inward/record.url?scp=0031764016&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0031764016&partnerID=8YFLogxK
M3 - Article
VL - 38
SP - 124
EP - 131
JO - Journal of Sports Medicine and Physical Fitness
JF - Journal of Sports Medicine and Physical Fitness
SN - 0022-4707
IS - 2
ER -