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Context: The maximal fat oxidation rate (MFO) is higher in aerobically fit vs unfit young men, but this training-related increase in MFO is attenuated in middle-aged men. Further, it has also been found that unfit men with obesity may have an elevated MFO compared to unfit normal-weight men.
Objective: Based hereupon, we aimed to investigate whether a fitness-related higher MFO were attenuated in middle-aged women compared to young women. Also, we aimed to investigate if unfit women with obesity have a higher MFO compared to unfit normal-weight women. We hypothesized that the training-related elevated MFO was attenuated in middle-aged women, but that unfit women with obesity would have an elevated MFO compared to unfit normal-weight women.
Methods: We recruited 70 women stratified into 6 groups: young fit (n = 12), young unfit (n = 12) middle-aged fit (n = 12), middle-aged unfit (n = 12), unfit young women with obesity (n = 12), and unfit middle-aged women with obesity (n = 10). Body composition and resting blood samples were obtained and MFO was measured by a graded exercise test on a cycle ergometer via indirect calorimetry. Subsequently, a maximal exercise test was performed to establish peak oxygen uptake (V̇O2peak).
Results: Young and middle-aged fit women had a higher MFO compared to age-matched unfit women, and young fit women had a higher MFO compared to fit middle-aged women. Unfit women with obesity, independent of age, had a higher MFO compared to their normal-weight and unfit counterparts.
Conclusion: The training-related increase in MFO seems maintained in middle-aged women, and we find that unfit women with obesity, independent of age, have a higher MFO compared to unfit normal-weight women.
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| http://dx.doi.org/10.1210/clinem/dgab473 | DOI Listing |
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