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Increased cardiac output elicits higher V̇O2max in response to self-paced exercise.
- Source :
-
Applied Physiology, Nutrition & Metabolism . Mar2015, Vol. 40 Issue 3, p223-229. 7p. - Publication Year :
- 2015
-
Abstract
- Recently, a self-paced protocol demonstrated higher maximal oxygen uptake versus the traditional ramp protocol. The primary aim of the current study was to further explore potential differences in maximal oxygen uptake between the ramp and self-paced protocols using simultaneous measurement of cardiac output. Active men and women of various fitness levels ( N = 30, mean age = 26.0 ± 5.0 years) completed 3 graded exercise tests separated by a minimum of 48 h. Participants initially completed progressive ramp exercise to exhaustion to determine maximal oxygen uptake followed by a verification test to confirm maximal oxygen uptake attainment. Over the next 2 sessions, they performed a self-paced and an additional ramp protocol. During exercise, gas exchange data were obtained using indirect calorimetry, and thoracic impedance was utilized to estimate hemodynamic function (stroke volume and cardiac output). One-way ANOVA with repeated measures was used to determine differences in maximal oxygen uptake and cardiac output between ramp and self-paced testing. Results demonstrated lower ( p < 0.001) maximal oxygen uptake via the ramp (47.2 ± 10.2 mL·kg-1·min-1) versus the self-paced (50.2 ± 9.6 mL·kg-1·min-1) protocol, with no interaction ( p = 0.06) seen for fitness level. Maximal heart rate and cardiac output ( p = 0.02) were higher in the self-paced protocol versus ramp exercise. In conclusion, data show that the traditional ramp protocol may underestimate maximal oxygen uptake compared with a newly developed self-paced protocol, with a greater cardiac output potentially responsible for this outcome. [ABSTRACT FROM AUTHOR]
- Subjects :
- *HEART physiology
*ANALYSIS of variance
*CONFIDENCE intervals
*EXERCISE
*EXERCISE physiology
*MATHEMATICAL statistics
*QUESTIONNAIRES
*STATISTICS
*DATA analysis
*PARAMETERS (Statistics)
*STATISTICAL reliability
*INTER-observer reliability
*REPEATED measures design
*OXYGEN consumption
*DESCRIPTIVE statistics
Subjects
Details
- Language :
- English
- ISSN :
- 17155312
- Volume :
- 40
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Applied Physiology, Nutrition & Metabolism
- Publication Type :
- Academic Journal
- Accession number :
- 101300951
- Full Text :
- https://doi.org/10.1139/apnm-2014-0305