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VO2 Reserve vs. Heart Rate Reserve During Moderate Intensity Treadmill Exercise
Tanner J Solheim1, Brad G Keller1, Charles J Fountaine1
1Department of Health, Physical Education and Recreation, University of Minnesota Duluth, Duluth, MN, USA.
Heart rate reserve (HRR) and VO2 reserve (VO2R) are used for exercise intensity. This study found VO2R is more accurately predicted than HRR during moderate exercise, suggesting caution when using HR to determine VO2.
Area of Science:
- Exercise Physiology
- Cardiovascular Physiology
Background:
- VO2 and heart rate (HR) are key for exercise intensity prescription.
- Using % reserve (%R) allows interchangeable use of HR and VO2 for accurate exercise intensity.
- VO2 reserve (VO2R) can inform heart rate reserve (HRR) prescription.
Purpose of the Study:
- To compare VO2 reserve (VO2R) and heart rate reserve (HRR) at 50%R during moderate-intensity exercise.
- To assess the accuracy of predicting VO2R and HRR in physically active college students.
Main Methods:
- Maximal treadmill tests were conducted to determine VO2 max and HR max.
- Submaximal exercise tests at 50%R were performed to measure actual VO2 and HR.
- Calculations compared predicted vs. actual VO2R and HRR.
Main Results:
- VO2 at 50%R was significantly greater than predicted (p < .001).
- Predicted HR at 50%R was significantly less than actual HR (p < .001).
- A weak correlation was found between VO2R and HRR.
Conclusions:
- VO2 is more accurately predicted than HR during moderate-intensity exercise.
- Caution is advised when using HR to determine VO2 due to weak VO2R-HRR correlation.
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