Determination of the exercise intensity that elicits maximal fat oxidation in short-time testing

Takagi, Shun; Sakamoto, Shizuo; Midorikawa, Taishi; Konishi, Masayuki; Katsumura, Toshihito

doi:10.1080/02640414.2013.815360

Cited by 22 publications

(26 citation statements)

References 27 publications

(32 reference statements)

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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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“…The main variations involve alterations in exercise intensities (eg, increments of 35 W vs 20 W) 8,48 or stage durations (eg, stage duration of 1 minute vs 10 minutes). 31,49 Nowadays, there is no consensus about which is the best stage duration to estimate MFO and Fat max . The application of too large workload increments and short stage durations may lose accuracy on MFO and Fat max estimation and do not ensure that the participant reaches steadystate gas exchange measure in each stage.…”

Section: Graded Exercise Protocolmentioning

confidence: 99%

Assessment of maximal fat oxidation during exercise: A systematic review

Amaro-Gahete

Sánchez-Delgado

Jurado‐Fasoli

et al. 2019

Scandinavian Med Sci Sports

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Maximal fat oxidation during exercise (MFO) and the exercise intensity eliciting MFO (Fatmax) are considered biological markers of metabolic health and performance. A wide range of studies have been performed to increase our knowledge about their regulation by exercise and/or nutritional intervention. However, numerous data collection and analysis approaches have been applied, which may have affected the MFO and Fatmax estimation. We aimed to systematically review the available studies describing and/or comparing different data collection and analysis approach factors that could affect MFO and Fatmax estimation in healthy individuals and patients. Two independent researchers performed the search. We included all original studies in which MFO and/or Fatmax were estimated by indirect calorimetry through an incremental graded exercise protocol published from 2002 to 2019. This systematic review provides key information about the factors that could affect MFO and Fatmax estimation: ergometer type, metabolic cart used, warm‐up duration and intensity, stage duration and intensities imposed in the graded exercise protocol, time interval selected for data analysis, stoichiometric equation selected to estimate fat oxidation, data analysis approach, time of the day when the test was performed, fasting time/previous meal before the test, and testing days for MFO/Fatmax and maximal oxygen uptake assessment. We suggest that researchers measuring MFO and Fatmax should take into account these key methodological issues that can considerably affect the accuracy, validity, and reliability of the measurement. Likewise, when comparing different studies, it is important to check whether the above‐mentioned key methodological issues are similar in such studies to avoid ambiguous and unacceptable comparisons.

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“…Bircher et al [4] reported that the protocol that was more time-consuming indicated a higher Fatmax and MFO than those done by a shorter protocol, although the increments for both protocols were small. These data indicated that Fatmax may be influenced by exercise duration, probably due to changes in substrate concentrations and hormonal responses [15]. In contrast, Achten et al [1] concluded that exercise duration did not affect Fatmax determination.…”

Section: Introductionmentioning

confidence: 96%

“…It is known that exercise intensity is one of the main factors determining the rate of fat oxidation during exercise [2]. Absolute fat oxidation rates increase during low-to-moderate exercise intensities and then markedly decline at high intensities, implying that there is an exercise intensity at which the rate of fat oxidation is maximal (Fatmax) [15]. The highest rate of fat oxidation during submaximal exercise has been reported to occur between 40 and 65% of peak oxygen consumption (VO2peak) [1].…”

Section: Introductionmentioning

confidence: 99%

A new method for the measurement of maximal fat oxidation: a pilot study

Purge

Lehismets

Jürimäe

2014

AKUT

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Exercise intensity is one of the main factors determining the rate of fat oxidation during exercise. The 3-min incremental protocol is desirable for practical reasons and allows for the estimation of fat oxidation across a wide range of exercise intensities. However, the use of a small number of exercise intensities traditionally used to estimate fat oxidation does not allow for the precise estimation of exercise intensity at which the rate of fat oxidation is maximal (Fatmax). The purpose of this study was to examine the validity of the determination of Fatmax adopting 1-min step incremental bicycle ergometer protocol. In this study we also compared Fatmax determined by 3-min step incremental bicycle ergometer test with Fatmax measured by 1-min step icremental bicycle ergometer test. The average peak oxygen consumption (VO2peak) for the entire group of subjects was 48.85±7.58 ml/min/kg. The Fatmax occurred at 47.2±4.9% of VO2peak in Test 1 and at 51.3±7.4% of VO2peak in Test 2, which corresponded to 35.8±7.4% and 36.1±8.0% of the maximal workload (Wmax) in Tests 1 and 2, respectively. Heart rate (HR) in Fatmax was at 63.9±6.8% and 62.1±6.2% from maximal HR in Tests 1 and 2, respectively. There were no significant differences (p<0.05) between work rate (WR), respiratory coefficent (RER) and HR at Fatmax during both tests. Similary, the values of Fatmax and VOfatmax were not significantly different in both tests. It appeared that the proposed 1-min step incemental exercise protocol can be used for the measurement of Fatmax in physically active males as the obtained results were not different from previously used methods to calculate Fatmax. However, the Fatmax results are different as fat oxidation rate is affected by endurance, sex, age, body composition, exercise type and exercise duration.

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Determination of the exercise intensity that elicits maximal fat oxidation in short-time testing

Cited by 22 publications

References 27 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

Assessment of maximal fat oxidation during exercise: A systematic review

A new method for the measurement of maximal fat oxidation: a pilot study

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