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Background  Ingesting Yerba Maté (YM) has become widely popular for health promotion, obesity prevention and body weight reduction, primarily due its thermogenic effectiveness. However, the YM effects on fat metabolism during exercise, when fat metabolism is already increased several fold, are unknown. The present study investigated whether acute YM ingestion augments fat metabolism parameters of fatty acid oxidation (FAO) and energy expenditure derived from FAO (EE FAO ) during exercise with several intensities.    Methods  Fourteen healthy males and females were randomised in a repeated measures crossover experimental design. All participants ingested either 1000 mg of YM or placebo capsules (PLC) 60 min before performing two incremental exercise ergometry tests. Power output was initiated at and increased by 0.5 W.kg -1  of body weight every 3 min stage, until reaching peak oxygen uptakeV  ˙    O   2Peak. Expired gases and stoichiometric indirect calorimetry were used to analyse FAO and EE FAO . Capillary blood samples were collected and analysed for blood lactate concentration (BLC) at rest and at each submaximal and maximal power output.    Results  YM significantly increased FAO and EE FAO  by 24% in all submaximal exercise intensities below 70% ofV  ˙    O    2peak(p < 0.001, ANOVA main effects) with post hoc tests showing a higher FAO and EE FAO  (p < 0.05) at the lower exercise intensities (e.g. 0.26 ± 0.09 vs. 0.35 ± 0.10 and 0.25 ± 0.12 vs. 0.33 ± 0.11 g.min -1  at 40 and 50% ofV  ˙    O    2peakrespectively). These changes were combined with a trend towards a decrease in BLC ( P  = 0.066), and without a significant difference inV  ˙    O    2peak, peak power, peak RER, or peak BLC.    Conclusions  Acute YM ingestion augments the exercise dependent increase in FAO and EE FAO  at submaximal exercise intensities without negatively affecting maximal exercise performance, suggesting a potential role for YM ingestion to increase the exercise effectiveness for weight loss and sports performance.

Yerba Maté (Illex Paraguariensis) ingestion augments fat oxidation and energy expenditure during exercise at various submaximal intensities