Does exercise duration affect Fatmax in overweight boys?

Crisp, Nicole; Guelfi, Kym J.; Licari, Melissa K.; Braham, Rebecca; Fournier, Paul A.

doi:10.1007/s00421-011-2232-5

Cited by 13 publications

(9 citation statements)

References 26 publications

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“…However, while more strict pre-test standardization leads to greater internal validity, it also leads to poorer external validity (i.e harder translation of the results into practice). More generally, while the validity of using a graded exercise tests to determine Fat max has been reported in a number of studies [3], [13], [33], [34], a recent study questions the usefulness using this approach to prescribe training in populations such as highly trained athletes [35]”.…”

Section: Discussionmentioning

confidence: 99%

Reproducibility of Fatmax and Fat Oxidation Rates during Exercise in Recreationally Trained Males

et al. 2014

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Aerobic exercise training performed at the intensity eliciting maximal fat oxidation (Fatmax) has been shown to improve the metabolic profile of obese patients. However, limited information is available on the reproducibility of Fatmax and related physiological measures. The aim of this study was to assess the intra-individual variability of: a) Fatmax measurements determined using three different data analysis approaches and b) fat and carbohydrate oxidation rates at rest and at each stage of an individualized graded test. Fifteen healthy males [body mass index 23.1±0.6 kg/m2, maximal oxygen consumption () 52.0±2.0 ml/kg/min] completed a maximal test and two identical submaximal incremental tests on ergocycle (30-min rest followed by 5-min stages with increments of 7.5% of the maximal power output). Fat and carbohydrate oxidation rates were determined using indirect calorimetry. Fatmax was determined with three approaches: the sine model (SIN), measured values (MV) and 3rd polynomial curve (P3). Intra-individual coefficients of variation (CVs) and limits of agreement were calculated. CV for Fatmax determined with SIN was 16.4% and tended to be lower than with P3 and MV (18.6% and 20.8%, respectively). Limits of agreement for Fatmax were −2±27% of with SIN, −4±32 with P3 and −4±28 with MV. CVs of oxygen uptake, carbon dioxide production and respiratory exchange rate were <10% at rest and <5% during exercise. Conversely, CVs of fat oxidation rates (20% at rest and 24–49% during exercise) and carbohydrate oxidation rates (33.5% at rest, 8.5–12.9% during exercise) were higher. The intra-individual variability of Fatmax and fat oxidation rates was high (CV>15%), regardless of the data analysis approach employed. Further research on the determinants of the variability of Fatmax and fat oxidation rates is required.

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Section: Discussionmentioning

confidence: 99%

Reproducibility of Fatmax and Fat Oxidation Rates during Exercise in Recreationally Trained Males

et al. 2014

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“…Few studies have been conducted on lipid oxidation in skeletal muscles during exercise in obese children and/ or adolescents and their findings are contradictory (Crisp et al, 2011;Lazzer et al, 2007;Maffeis et al, 2005;Zunquin et al, 2009). According to our data, lipid oxidation rates did not differ significantly between obese and normal-weight girls at different levels of exercise intensity, despite large differences in adiposity.…”

Section: Discussionmentioning

confidence: 96%

“…Indeed, results of studies carried out by Lazzer et al (2007) and Maffeis et al (2005) indicated that lipid oxidation rates did not change significantly between obese and non-obese adolescents at different levels of exercise intensity. Similarly, Crisp et al (2011) reported comparable rates of lipid oxidation in overweight or obese boys compared to normal-weight boys during exercise at 50% _ V O 2max . In contrast, Zunquin et al (2009) found a higher lipid oxidation rate in lean compared to obese boys at moderate exercise intensity only.…”

Section: Introductionmentioning

confidence: 83%

“…To date, few data are available in obese children (Crisp, Guelfi, Braham, & Licari, 2011;Maffeis et al, 2005;Zunquin, Theunynck, Sesboue, Arhan, & Bougle, 2009) and obese adolescents (Lazzer et al, 2007), particularly in girls, and conflicting results exist. Indeed, results of studies carried out by Lazzer et al (2007) and Maffeis et al (2005) indicated that lipid oxidation rates did not change significantly between obese and non-obese adolescents at different levels of exercise intensity.…”

Section: Introductionmentioning

confidence: 92%

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Severely obese adolescent girls rely earlier on carbohydrates during walking than normal-weight matched girls

Gavarry

Aguer

Delextrat

et al. 2015

Journal of Sports Sciences

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The purpose of this study was to determine the substrate oxidation rate and the exercise intensity at which maximal lipid oxidation and ventilatory threshold (VT) occur in obese (BMI: 36.6 ± 6.3 kg · m(-2)) and normal-weight adolescent girls (BMI: 18.7 ± 1.6 kg · m(-2)) aged 14-18 years. Substrate oxidation rate was determined by gas exchange using an incremental field test involving walking. Body composition was assessed by bioelectrical impedance. Carbohydrate oxidation rates were significantly higher in obese than in normal-weight girls at speeds ranging from 4 to 6 km · h(-1) (P < 0.05), whereas no significant differences were observed between groups regarding lipid oxidation rates. The crossover point of substrate utilisation and the VT were significantly lower in obese than in normal-weight adolescents (P < 0.05). Maximal lipid oxidation rate was observed at 46 ± 15 and 53 ± 15 %EVO2max in obese and normal-weight adolescents, respectively. At these intensities, the Lipox(max) was significantly lower in obese than in normal-weight girls (6.7 ± 2.3 versus 8.9 ± 3.5 mg · min(-1) · kg(-1) FFM, P < 0.05, 95% CI: -3.7 to -0.7, d = -0.74). The present results have implications in designing interventions to promote lipid oxidation and energy expenditure during walking in severely obese adolescent girls.

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“…Apart that, studies demonstrated how long stage durations are rather time consuming and have an influence on lactate concentrations at the intensity eliciting the FAT max , additionally contributing to correlation assessment bias [30–32]. Contrary to LT, using VT demonstrated to be a better index of estimating metabolic thresholds in diverse subjects [2,12,28].…”

Section: Discussionmentioning

confidence: 99%

Can Metabolic Thresholds be used as Exercise Intensity Markers in Adult men with Obesity?

Ratko¹,

Zoran

2018

Preprint

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Markers in Adult men with Obesity?3 1 test were used to evaluate differences between VO 2 at AeT and at FAT max and VO 2 at AnT and at 3 2 FAT min , respectively. FAT max and AeT occurred at 42.80 ± 2.68 % of VO 2max and 43.02 ± 2.73 % 3 3 of VO 2max , while FAT min and AnT occurred at 53.40 ± 3.65 % of VO 2max and 53.38 ± 3.65 % of 3 4 VO 2max , respectively. A high correlations were found between VO 2 at FAT max and at AeT (r = 3 5 0.86, p < 0.01) and VO 2 at FAT min and at AnT (r = 0.99, p < 0.01). The existing correlations 3 6suggest that metabolic thresholds may be used as exercise intensity markers in men with obesity. 3 7 3 8

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Does exercise duration affect Fatmax in overweight boys?

Cited by 13 publications

References 26 publications

Reproducibility of Fatmax and Fat Oxidation Rates during Exercise in Recreationally Trained Males

Reproducibility of Fatmax and Fat Oxidation Rates during Exercise in Recreationally Trained Males

Severely obese adolescent girls rely earlier on carbohydrates during walking than normal-weight matched girls

Can Metabolic Thresholds be used as Exercise Intensity Markers in Adult men with Obesity?

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