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The day-to-day reliability of peak fat oxidation and FATMAX.

ABSTRACT: PURPOSE:Prior studies exploring the reliability of peak fat oxidation (PFO) and the intensity that elicits PFO (FATMAX) are often limited by small samples. This study characterised the reliability of PFO and FATMAX in a large cohort of healthy men and women. METHODS:Ninety-nine adults [49 women; age: 35 (11) years; [Formula: see text]O2peak: 42.2 (10.3) mL·kg BM-1·min-1; mean (SD)] completed two identical exercise tests (7-28 days apart) to determine PFO (g·min-1) and FATMAX (%[Formula: see text]O2peak) by indirect calorimetry. Systematic bias and the absolute and relative reliability of PFO and FATMAX were explored in the whole sample and sub-categories of: cardiorespiratory fitness, biological sex, objectively measured physical activity levels, fat mass index (derived by dual-energy X-ray absorptiometry) and menstrual cycle status. RESULTS:No systematic bias in PFO or FATMAX was found between exercise tests in the entire sample (- 0.01 g·min-1 and 0%[Formula: see text]O2peak, respectively; p?>?0.05). Absolute reliability was poor [within-subject coefficient of variation: 21% and 26%; typical errors:?±?0.06 g·min-1 and?×?/?÷?1.26%[Formula: see text]O2peak; 95% limits of agreement:?±?0.17 g·min-1 and?×?/?÷?1.90%[Formula: see text]O2peak, respectively), despite high (r?=?0.75) and moderate (r?=?0.45) relative reliability for PFO and FATMAX, respectively. These findings were consistent across all sub-groups. CONCLUSION:Repeated assessments are required to more accurately determine PFO and FATMAX.

SUBMITTER: Chrzanowski-Smith OJ

PROVIDER: S-EPMC7340634 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature

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The day-to-day reliability of peak fat oxidation and FAT<sub>MAX</sub>.

Chrzanowski-Smith Oliver J OJ Edinburgh Robert M RM Thomas Mark P MP Haralabidis Nicos N Williams Sean S Betts James A JA Gonzalez Javier T JT

European journal of applied physiology 20200601 8

<h4>Purpose</h4>Prior studies exploring the reliability of peak fat oxidation (PFO) and the intensity that elicits PFO (FAT<sub>MAX</sub>) are often limited by small samples. This study characterised the reliability of PFO and FAT<sub>MAX</sub> in a large cohort of healthy men and women.<h4>Methods</h4>Ninety-nine adults [49 women; age: 35 (11) years; [Formula: see text]O<sub>2</sub>peak: 42.2 (10.3) mL·kg BM<sup>-1</sup>·min<sup>-1</sup>; mean (SD)] completed two identical exercise tests (7-28 ...[more]

PMID: 32488584

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Project description:PurposeTo provide empirically-supported thresholds for step-based intensity (i.e., peak 30-min cadence; average of the top 30 steps/min in a day) and steps/day in relation to cardiometabolic health outcomes.MethodsReceiver operating characteristic curve analysis was applied to the National Health and Nutrition Examination Survey (NHANES) 2005-2006 accelerometer-derived step data to determine steps/day and peak 30-min cadence as risk screening values (i.e., thresholds) for fasting glucose, body mass index, waist circumference, high blood pressure, triglycerides, and HDL cholesterol. Thresholds for peak 30-min cadence and steps/day were derived that, when exceeded, classify the absence of each cardiometabolic risk factor. Additionally, logistic regression models that included the influence of age and smoking were developed using the sample weights, primary sampling units (PSUs), and stratification variables provided by the NHANES survey. Finally, a decision tree analysis was performed to delineate criteria for at-risk versus healthy populations using cadence bands.ResultsPeak 30-min cadence thresholds across cardiometabolic outcomes ranged from 66-72 steps/min. Steps/day thresholds ranged from 4325-6192 steps/day. Higher thresholds were observed in men compared to women. In men, higher steps/day thresholds were observed in age ranges of 30-39, while in women, higher thresholds were observed in the age-range 50-59 years. Decision trees for classifying being at low risk for metabolic syndrome contained one risk-free leaf at higher cadence bands, specifically for any time accumulated at ≥120 steps/min.ConclusionsMinimum thresholds representing absence of cardiometabolic risk range from 4325-6192 steps/day and 66-72 steps/min for peak 30-min cadence. Any time accumulated at ≥120 steps/min was associated with an absence of cardiometabolic risk. Although based on cross-sectional data, these thresholds represent potentially important and clinically interpretable daily physical activity goals.

Dataset Information

The day-to-day reliability of peak fat oxidation and FATMAX.

Publications

The day-to-day reliability of peak fat oxidation and FAT<sub>MAX</sub>.

Similar Datasets

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