Based on stoichiometric assumptions, a lower RER (i.e. One such device (Lumen, MetaFlow Ltd.) currently available to consumers is marketed as the ‘first hand-held, portable device to accurately measure metabolism’ ( Based on real-time assessment of expired percentage of carbon dioxide (%CO 2) and flow rate after a breath-hold procedure, the Lumen device is proposed to support monitoring for weight loss programs and longer-term metabolic flexibility, as well as support individual responses to tailored dietary strategies. application of a personalized nutrition approach, or periodized dietary preparations for an event). participant adherence to dietary interventions) or from a consumer self-monitoring perspective (e.g. Therefore, the potential to accurately assess or track substrate utilization away from the laboratory may be beneficial in supporting nutrition or exercise-based research (e.g. However, there are currently limited market resources to quantify expired air analysis outside of laboratory conditions (i.e. Home-use devices such as glucose monitors and cardiovascular trackers are becoming more available and, with technological advancements, are becoming more cost-effective. Moreover, while laboratory-based studies tend to report pre-to-post dietary intervention effects, it is challenging to accurately quantify non-laboratory-based metabolic measures to quantify the metabolic effects of dietary programs. ![]() ![]() However, accurate determination of metabolic patterns typically involves controlled laboratory conditions, as well as expensive analytical equipment. Estimation of macronutrient contribution to energy demands is important for evaluating metabolic change and/or metabolic flexibility in relation to dietary or exercise-based interventions. Through assessment of expired fractional gas measures under controlled laboratory conditions, metabolic rate and relative contribution of energy substrates (notably fat and carbohydrate oxidation rates) can be estimated from stoichiometric equations or extrapolated from the respiratory quotient (RQ)/respiratory exchange ratio (RER). Estimates of metabolic responses under resting (fed/fasted) and exercise conditions are typically measured using indirect calorimetry, notably the use of Douglas bag expired air collection, through to ventilated hood or breath-to-breath analyzers. The importance of individualized dietary advice has been increasingly recognized, including day-to-day tailored recommendations before, during, and after training and/or competition. As part of this, metabolic responses to dietary intake can provide strategic advantages when planning and undertaking exercise programs. ![]() Nutritional intake is an essential component influencing exercise adherence and aerobic/anaerobic sports performance. ![]() Repeated measures ANOVA were employed for main analyses, with Bonferroni post-hoc assessment applied ( P ≤ 0.05). L%CO 2 and derived Lumen Index (L I) were recorded daily across morning (fasted and post-breakfast) and evening (pre/post meal, pre-bed) periods. In a separate phase, 27 recreationally active adults (age: 42 ± 2 yrs body mass: 71.9 ± 1.9 kg height: 1.72 ± 0.02 m) completed a 7-day low- (~20% of energy intake LOW) or high-carbohydrate diet (~60% of EI HIGH) in a randomized, cross-over design under free-living conditions. Data were analyzed using a one-way ANOVA, with ordinary least squares regression used to assess the model between Lumen expired carbon dioxide percentage (L%CO 2) and respiratory exchange ratio (RER). kg −1) meal, along with capilliarized blood glucose assessment.Following institutional ethical approval, 12 healthy volunteers (age: 36 ± 4 yrs body mass: 72.1 ± 3.6 kg height: 1.71 ± 0.02 m) performed Lumen breath and Douglas bag expired air measures under fasted laboratory conditions and at 30 and 60 min after a high-carbohydrate (2 g
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