Maximal Fat Oxidation Rates in an Athletic Population

Randell, Rebecca K.; Rollo, Ian; Roberts, Timothy J.; Dalrymple, Kortney J.; Jeukendrup, Asker E.; Carter, James M.

doi:10.1249/mss.0000000000001084

Cited by 70 publications

(116 citation statements)

References 35 publications

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“…Some studies [5,7,9,17,34,36], but not all [22,27,28], have shown that during endurance exercise women derive proportionally more of the total energy expenditure from fat oxidation with a concomitant lower contribution of carbohydrate (CHO) oxidation compared to men. Furthermore, it has been reported that PFO per kilogram fat-free mass (FFM) and the relative exercise intensity that elicit PFO (Fatmax) are significantly higher in women compared to men [7,26,36]. In line with this, men seem to exhibit a lower metabolic crossover point than women during incremental exercise [36].…”

Section: Introductionmentioning

confidence: 87%

Peak Fat Oxidation is not Independently Related to Ironman Performance in Women

et al. 2018

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The aim of the present study was to investigate if peak fat oxidation rate (PFO) is related to Ironman performance in female athletes. Thirty-six female Ironman athletes (age: 34±1 yrs, [21-45 yrs.] SEM [Range]) with a BMI of 22.1±2.0 kg/m [18.8-28.4 kg/m], a body fat percentage of 24.8±1.0% [9.0-37.0%] and a V̇Opeak of 53.0±1.3 ml/min/kg [36.5-70.5 ml/min/kg] were tested in the laboratory prior to the Ironman Copenhagen 2017. Race time ranged from 9:17:07 to 15:23:48 with mean race time being 11:57:26 h:min:s (717 min). By simple linear regression analyses we found associations between race time and P FO (r=0.22, p<0.005), V̇Opeak (r=0.65, p<0.0001) and the relative exercise intensity eliciting PFO (Fatmax) (r=0.35, p=0.0001). Furthermore, associations were found between race time and body fat percentage (r=0.44, p<0.0001) and age (r=0.16, p<0.05). By means of multiple regression analysis, V̇Opeak was the only statistically significant variable explaining 64% of the variation in race time (adj. r=0.64, p<0.005). In conclusion, these results demonstrate that PFO is not independently related to Ironman performance in a heterogeneous group of female athletes. Interestingly, V̇Opeak alone was able to predict 64% of the variation in Ironman race times.

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Section: Introductionmentioning

confidence: 87%

Peak Fat Oxidation is not Independently Related to Ironman Performance in Women

et al. 2018

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“…Skeletal muscle is the primary site for fat oxidation during exercise. Accordingly, MFO was found to correlate ( r = 0.55‐0.66) with the amount of fat‐free mass . More specifically, it appears that a high percentage of slow twitch (ST) muscle fibers ( r = 0.62) are associated with a high MFO .…”

Section: Introductionmentioning

confidence: 94%

“…Accordingly, MFO was found to correlate (r = 0.55-0.66) with the amount of fat-free mass. 1,5,7,11 More specifically, it appears that a high percentage of slow twitch (ST) muscle fibers (r = 0.62) are associated with a high MFO. 11 In line, endurance athletes, who have a high oxidative capacity and a high MFO also possess a high amount of ST muscle fibers compared to untrained individuals (60-90 vs 40%-60%).…”

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confidence: 99%

Determinants of maximal whole‐body fat oxidation in elite cross‐country skiers: Role of skeletal muscle mitochondria

Dandanell

Meinild‐Lundby

Andersen

et al. 2018

Scandinavian Med Sci Sports

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Elite endurance athletes possess a high capacity for whole-body maximal fat oxidation (MFO). The aim was to investigate the determinants of a high MFO in endurance athletes. The hypotheses were that augmented MFO in endurance athletes is related to concomitantly increments of skeletal muscle mitochondrial volume density (Mito ) and mitochondrial fatty acid oxidation (FAO ), that is, quantitative mitochondrial adaptations as well as intrinsic FAO per mitochondria, that is, qualitative adaptations. Eight competitive male cross-country skiers and eight untrained controls were compared in the study. A graded exercise test was performed to determine MFO, the intensity where MFO occurs (Fat ), and . Skeletal muscle biopsies were obtained to determine Mito (electron microscopy), FAO , and OXPHOS (high-resolution respirometry). The following were higher (P < 0.05) in endurance athletes compared to controls: MFO (mean [95% confidence intervals]) (0.60 g/min [0.50-0.70] vs 0.32 [0.24-0.39]), Fat (46% [44-47] vs 35 [34-37]), (71 mL/min/kg [69-72] vs 48 [47-49]), Mito (7.8% [7.2-8.5] vs 6.0 [5.3-6.8]), FAO (34 pmol/s/mg muscle ww [27-40] vs 21 [17-25]), and OXPHOS (108 pmol/s/mg muscle ww [104-112] vs 69 [68-71]). Intrinsic FAO (4.0 pmol/s/mg muscle w.w/Mito [2.7-5.3] vs 3.3 [2.7-3.9]) and OXPHOS (14 pmol/s/mg muscle ww/Mito [13-15] vs 11 [10-13]) were, however, similar in the endurance athletes and untrained controls. MFO and Mito correlated (r = 0.504, P < 0.05) in the endurance athletes. A strong correlation between Mito and MFO suggests that expansion of Mito might be rate-limiting for MFO in the endurance athletes. In contrast, intrinsic mitochondrial changes were not associated with augmented MFO.

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“…It's important to highlight that the maximal fat oxidation rate during exercise varies largely among athletes. In soccer players, mean maximal fat oxidation rate is at 51.8% VO 2 max, but varies between 22.9% and 88.5% VO 2 max (56) .…”

Section: Fats and Exercisementioning

confidence: 99%

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2017

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Maximal Fat Oxidation Rates in an Athletic Population

Cited by 70 publications

References 35 publications

Peak Fat Oxidation is not Independently Related to Ironman Performance in Women

Peak Fat Oxidation is not Independently Related to Ironman Performance in Women

Determinants of maximal whole‐body fat oxidation in elite cross‐country skiers: Role of skeletal muscle mitochondria

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