Reply to Dutheil et al.

Frandsen, Jacob; Pistoljevic, Nina; Quesada, Júlia Prats; Amaro‐Gahete, Francisco J.; Larsen, Steen; Dela, Flemming; Helge, Jørn Wulff

doi:10.1152/japplphysiol.00437.2020

Cited by 1 publication

(1 citation statement)

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“…Finally, we organized both testing days during the luteal phase of the menstrual cycle (i.e. asking the participants about menstrual cycle length) although it has been shown that MFO and Fat max do not vary across the menstrual cycle (Jacob Frandsen et al, 2020).…”

Section: Methodsmentioning

confidence: 99%

No diurnal variation is present in maximal fat oxidation during exercise in young healthy women: A cross‐over study

Robles-González

Aguilar-Navarro

López-Samanés

et al. 2022

European Journal of Sport Science

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Maximal fat oxidation during exercise (MFO) and the intensity that elicits MFO (Fat max ) seems to show a diurnal variation in men, which favours an increased performance in the afternoon than the morning. At present, it remains unknown whether the observed MFO and Fat max diurnal variation in men is also present in women. Therefore, the current study examined the diurnal variations of MFO and Fat max in women. Nineteen healthy women (age: 26.9 ± 8.7 years, maximum oxygen uptake: 39.8 ± 6.5 ml/kg/min) participated in the study. MFO and Fat max were determined by a graded exercise test in cycloergometer using a cross-over design performed on two separate daytime schedules, one conducted in the morning (8am-11am) and one in the afternoon (5pm-8pm). Stoichiometric equations were used to calculate fat oxidation rates. There were no significant differences between MFO-morning and MFO-afternoon (0.24 ± 0.10 vs. 0.23 ± 0.07 g/min, respectively; P = 0.681). Similarly, there was no significant differences between Fat max -morning and Fat max -afternoon (41.1 ± 4.7 vs. 42.6 ± 5.5% of maximal oxygen uptake, respectively; P = 0.305). These results persisted after controlling for fat mass percentage (all P > 0.5). In summary, the main finding of the present study was that MFO and Fat max were similar independent of the time-of-day when the exercise test is performed in healthy women. These results have important clinical implications since they suggest that, in contrast to what was found in men, MFO and Fat max show similar rates during the course of the day in women. Highlights. MFO and Fat max were similar during the afternoon and morning in young healthy women.. Our results suggest that, in women, it does not matter when endurance exercise is performed in term of fat metabolism during exercise.

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Section: Methodsmentioning

confidence: 99%