The aim of this study was to examine the effect of acute Rhodiola rosea (R. rosea) ingestion on substrate utilisation, mood state,\nRPE, and exercise affect. Ten males (mean age �± S.D. = 26 �± 6 years) completed two 30-minute cycling trials at an intensity of 70%\nof V?O2 max following ingestion of either 3mg?kg?1 body mass of R. rosea or placebo using a double-blind, crossover design. During\nexercise, heart rate and RPE were recorded. Participants completed measures of mood state and exercise affect before and after\nexercise. Expired air samples were taken during exercise to determine substrate utilisation. Repeated measures analysis of variance\nindicated that RPE was significantly lower at 30 minutes into exercise versus placebo (P = 0.003). Perceptions of arousal (P = 0.05)\nand pleasure were significantly higher after exercise with R. rosea compared to placebo (P = 0.003).Mood state scores for vigor were\nalso higher in R. rosea condition compared to placebo (P = 0.008). There were no significant differences in energy expenditure,\ncarbohydrate, or fat oxidation between conditions (P > 0.05). Ingestion of R. rosea favourably influenced RPE and exercise affect\nwithout changes in energy expenditure or substrate utilization during 30-minute submaximal cycling performance.
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