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This study compared the demands of a soccer match simulation (SMS) incorporating 90 min of soccer-specific movement with passing, dribbling and shooting skills with those of competitive match-play (match). 10 elite youth soccer players participated in SMS and match-play while ingesting fluid-electrolyte beverages. No differences existed between trials for mean HR (SMS, match: 158±4 beats· min− 1, 160±3 beats· min− 1; P= 0.587), peak HR (SMS, match: 197±3 beats· min− 1, 197±4 beats· min− 1; P= 0.935) and blood glucose concentrations (SMS, match: 4.5±0.1 mmol· L− 1, 4.6±0.2 mmol· L− 1; P= 0.170). Inter-trial coefficient of variation (with Bland and Altman limits of agreement) were 2.6%(− 19.4–15.4 beats· min− 1), 1.6%(− 14.3–14.7 beats· min− 1) and 5.0%(− 0.9–0.7 mmol· L− 1) for mean HR, peak HR and blood glucose concentrations. Although the pattern of blood lactate response was similar between …