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Optimizing Maximal Fat Oxidation Assessment by a Treadmill-Based Graded Exercise Protocol: When Should the Test End?

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Maximal fat oxidation (MFO) and Fatmax tests may not require reaching a respiratory exchange ratio (RER) of 1.0. Studies suggest ending tests earlier (RER 0.93 for sedentary, 0.90 for trained) for accurate metabolic health and performance insights.

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Area of Science:

  • Exercise Physiology
  • Metabolic Health
  • Sports Science

Background:

  • Maximal fat oxidation (MFO) and the intensity at which it occurs (Fatmax) are key indicators of metabolic health and exercise performance.
  • Current methods for determining MFO and Fatmax during incremental exercise often involve protocols that continue until a respiratory exchange ratio (RER) of 1.0 is reached.
  • The necessity of reaching an RER of 1.0 for accurate MFO and Fatmax measurement remains unclear, given the variability in testing protocols.

Purpose of the Study:

  • To investigate the specific respiratory exchange ratio (RER) at which maximal fat oxidation (MFO) and Fatmax occur in both sedentary and trained healthy adults.
  • To determine if the conventional endpoint of RER 1.0 is essential for reliable MFO and Fatmax estimation.
  • To provide evidence-based recommendations for optimizing MFO and Fatmax testing protocols.

Main Methods:

  • A total of 166 healthy sedentary adults (aged 18-65 years) underwent incremental graded exercise protocols to determine MFO and Fatmax.
  • Measurements were taken before and after two distinct exercise-based interventions.
  • Data analysis explored various approaches to calculate Fatmax, assessing the impact of different RER endpoints.

Main Results:

  • Maximal fat oxidation (MFO) and Fatmax were found to occur at an RER of approximately 0.93 in sedentary adults and 0.90 in trained adults.
  • These findings were consistent across different sexes, age groups, body weight statuses, and Fatmax data analysis methods.
  • The study suggests that protocols could potentially conclude earlier than the traditional RER 1.0 endpoint.

Conclusions:

  • The study recommends adjusting the endpoint for MFO and Fatmax testing to an RER of 0.95 to ensure MFO is captured, even in outlier cases.
  • This methodological adjustment allows for shorter workload increments or longer stage durations to achieve steady-state, without extending overall test time.
  • Implementing these changes has significant clinical implications for accurately assessing metabolic health and exercise capacity.