Could a Short Incremental Test Be a Valid Cardiorespiratory Efficiency Assessment Tool in Obese Adults? A Comparison...

Area of Science:

• Exercise Physiology
• Obesity Research
• Metabolic Assessment

Background:

• Cardiorespiratory efficiency is crucial for obese adults.
• Treadmill protocols vary in stage duration, potentially impacting results.
• Understanding protocol effects is key for accurate assessment.

Purpose of the Study:

• To compare two treadmill exercise test protocols (2- vs. 3-minute stages) for assessing cardiorespiratory efficiency in obese adults.
• To determine if stage duration influences key metabolic and physiological markers.
• To establish protocol interchangeability for specific measurements.

Main Methods:

• Thirty-six obese adults (16 men, 20 women) underwent submaximal incremental graded exercise tests.
• Tests utilized treadmills with either 2-minute or 3-minute stages on separate occasions.
• Measurements included heart rate, oxygen uptake, perceived exertion, and fat oxidation at maximal fat oxidation.

Main Results:

• Heart rate, oxygen uptake, and perceived exertion at maximal fat oxidation showed no significant differences between protocols.
• Fat oxidation at maximal fat oxidation was significantly higher with the 2-minute stage protocol (576.3±162.9 mg/min) compared to the 3-minute stage protocol (506.0±148.1 mg/min).
• Differences were also observed in fat oxidation at the high and low borders of the Fatmax zone.

Conclusions:

• Stage duration in treadmill exercise testing does not influence the exercise intensity at which maximal fat oxidation occurs.
• The 2- and 3-minute stage protocols are largely interchangeable for assessing heart rate, oxygen uptake, and perceived exertion at maximal fat oxidation.
• Protocol choice may impact fat oxidation measurements, suggesting careful consideration for specific research questions.