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Relationships between HR and (.)VO(2) in the obese
Nuala M Byrne1, Andrew P Hills
1School of Human Movement Studies, Faculty of Health, Queensland University of Technology, Brisbane, QLD, Australia. byrnen@shrp.uab.edu
Medicine and Science in Sports and Exercise
|September 10, 2002
Summary
Exercise intensity recommendations for obese adults differ from standard guidelines. Heart rate reserve (%HRR) aligns with oxygen consumption reserve ((.)VO(2)R), not peak oxygen consumption ((.)VO(2peak)), impacting weight loss strategies.
Area of Science:
- Exercise Physiology
- Obesity Research
- Cardiorespiratory Fitness
Background:
- Accurate exercise prescription is crucial for weight management in obese populations.
- Existing exercise intensity guidelines, often based on normal-weight individuals, may not be optimal for the obese.
- Understanding cardiorespiratory parameter relationships is key to tailoring effective exercise interventions.
Purpose of the Study:
- To examine relationships between relative indices of peak oxygen consumption ((.)VO(2peak)), oxygen consumption reserve ((.)VO(2)R), peak heart rate (HR(peak)), and heart rate reserve (HRR) in obese adults.
- To determine if %HRR is equivalent to %(.)VO(2peak) or %(.)VO(2)R in this population.
- To assess the validity of the American College of Sports Medicine's (%(.)VO(2peak)-%HR(peak)) relationship in obese individuals and evaluate variability relative to lactate threshold (LT).
Main Methods:
- Thirty-two sedentary obese adults (42.1 ± 9.6 years) participated in three weekly sessions over three weeks.
- Methods included familiarization, graded treadmill tests for cardiorespiratory capacity, and body composition analysis.
- Resting heart rate (HR(rest)) and oxygen consumption ((.)VO(2rest)) were measured using a ventilated hood system.
Main Results:
- The %HR(peak)-%(.)VO(2peak) relationship in obese adults was significantly different from American College of Sports Medicine recommendations.
- %HRR was found to be equivalent to (.)VO(2)R, but not %(.)VO(2peak).
- Prescribing exercise at fixed percentages of (.)VO(2peak) or HR(peak) resulted in wide variations in exercise intensity relative to LT.
Conclusions:
- Cardiorespiratory parameter relationships in obese individuals differ from those in normal-weight populations.
- These differences have significant implications for optimizing exercise intensity for weight loss in the obese.
- Adjusted exercise prescription strategies are needed to improve exercise adherence and effectiveness in obese adults.