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Postexercise oxygen consumption and substrate use after resistance exercise in women
C A Binzen1, P D Swan, M M Manore
1Exercise and Wellness Research Laboratory, Department of Exercise and Wellness, Arizona State University East, 7001 E. Williams Field Rd., Mesa, AZ 85212, USA. cbinzen@jhmi.edu
Medicine and Science in Sports and Exercise
|June 19, 2001
Summary
Resistance exercise (RE) in trained women modestly elevates oxygen consumption for two hours post-workout, leading to increased fat oxidation during recovery.
Area of Science:
- Exercise Physiology
- Metabolic Studies
- Sports Science
Background:
- Understanding the metabolic impact of resistance exercise (RE) is crucial for optimizing training protocols.
- Excess postexercise oxygen consumption (EPOC) and substrate utilization are key indicators of metabolic adaptation.
- Limited data exists on the acute effects of RE on EPOC and substrate oxidation in trained women.
Purpose of the Study:
- To investigate the acute effects of a 45-minute resistance exercise session on EPOC.
- To determine changes in substrate oxidation for 120 minutes following resistance exercise.
- To analyze these effects in moderately trained women.
Main Methods:
- Ten recreationally trained women participated in a randomized, counterbalanced crossover study.
- Two conditions were tested: a control (sitting) and a resistance exercise (RE) trial.
- Oxygen consumption (VO2) and respiratory exchange ratio (RER) were measured via indirect calorimetry; blood lactate ([BL]) was also monitored.
Main Results:
- EPOC was elevated by 18.6% over the control period during the 2-hour recovery.
- Respiratory exchange ratio (RER) was significantly lower post-RE, indicating a shift towards fat metabolism.
- Fat oxidation was significantly higher (29.2 kcal vs. 16.3 kcal) in the RE trial compared to the control.
Conclusions:
- Acute resistance exercise in trained women results in a moderate increase in postexercise oxygen consumption.
- Resistance exercise significantly enhances fat oxidation during the 2-hour recovery period.
- These findings suggest RE contributes to improved metabolic efficiency and fat utilization.