Abstract
The purpose of the present study was to assess the relationship between the rapidity of increased oxygen uptake (V̇O2) and increased cardiac output (CO) during heavy exercise. Six subjects performed repeated bouts on a cycle ergometer above the ventilatory threshold (∼80% of peak V̇O2) separated by 10-min recovery cycling at 35% peak V̇O2. V̇O2 was determined breath-by-breath and CO was determined continuously by impedance cardiography. CO and V̇O 2 values were significantly higher during the 2-min period preceding the second bout. The overall responses for V̇O2 and CO were significantly related and were faster during the second bout. Prior heavy exercise resulted in a significant increase in the amplitude of the fast component of V̇O2, with no change in the time constant and a decrease in the slow component. Under these circumstances, the amplitude of the fast component was more sensitive to prior heavy exercise than was the associated time constant.
| Original language | English |
|---|---|
| Pages (from-to) | 283-298 |
| Number of pages | 16 |
| Journal | Canadian Journal of Applied Physiology |
| Volume | 28 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 1 Jan 2003 |
| Externally published | Yes |
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Keywords
- Cardiac output
- Exercise transitions
- Impedance cardiography
- Prior exercise
ASJC Scopus subject areas
- Physiology
- Orthopedics and Sports Medicine
Cite this
Cardiovascular and oxygen uptake kinetics during sequential heavy cycling exercises. / Perrey, Stéphane; Scott, Jodie; Mourot, Laurent; Rouillon, Jean Denis.
In: Canadian Journal of Applied Physiology, Vol. 28, No. 2, 01.01.2003, p. 283-298.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Cardiovascular and oxygen uptake kinetics during sequential heavy cycling exercises
AU - Perrey, Stéphane
AU - Scott, Jodie
AU - Mourot, Laurent
AU - Rouillon, Jean Denis
PY - 2003/1/1
Y1 - 2003/1/1
N2 - The purpose of the present study was to assess the relationship between the rapidity of increased oxygen uptake (V̇O2) and increased cardiac output (CO) during heavy exercise. Six subjects performed repeated bouts on a cycle ergometer above the ventilatory threshold (∼80% of peak V̇O2) separated by 10-min recovery cycling at 35% peak V̇O2. V̇O2 was determined breath-by-breath and CO was determined continuously by impedance cardiography. CO and V̇O 2 values were significantly higher during the 2-min period preceding the second bout. The overall responses for V̇O2 and CO were significantly related and were faster during the second bout. Prior heavy exercise resulted in a significant increase in the amplitude of the fast component of V̇O2, with no change in the time constant and a decrease in the slow component. Under these circumstances, the amplitude of the fast component was more sensitive to prior heavy exercise than was the associated time constant.
AB - The purpose of the present study was to assess the relationship between the rapidity of increased oxygen uptake (V̇O2) and increased cardiac output (CO) during heavy exercise. Six subjects performed repeated bouts on a cycle ergometer above the ventilatory threshold (∼80% of peak V̇O2) separated by 10-min recovery cycling at 35% peak V̇O2. V̇O2 was determined breath-by-breath and CO was determined continuously by impedance cardiography. CO and V̇O 2 values were significantly higher during the 2-min period preceding the second bout. The overall responses for V̇O2 and CO were significantly related and were faster during the second bout. Prior heavy exercise resulted in a significant increase in the amplitude of the fast component of V̇O2, with no change in the time constant and a decrease in the slow component. Under these circumstances, the amplitude of the fast component was more sensitive to prior heavy exercise than was the associated time constant.
KW - Cardiac output
KW - Exercise transitions
KW - Impedance cardiography
KW - Prior exercise
UR - http://www.scopus.com/inward/record.url?scp=0038455947&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0038455947&partnerID=8YFLogxK
U2 - 10.1139/h03-022
DO - 10.1139/h03-022
M3 - Article
VL - 28
SP - 283
EP - 298
JO - Applied Physiology, Nutrition and Metabolism
JF - Applied Physiology, Nutrition and Metabolism
SN - 1715-5312
IS - 2
ER -