It's a nonsensical number, comparing to measurements of Tour de France cyclists or ultramarathoners running 100kms per day, who can expect to hit that kind of f

It's a nonsensical number, comparing to measurements of Tour de France cyclists or ultramarathoners running 100kms per day, who can expect to hit that kind of figure. The highest recorded expenditure is around 11,000kcals / day. Under truly absurd conditions: manhauling sleds weighing hundreds of kilos across ice so cold that it doesn't create a lubricating layer, from 60M above sea level to 3,000M above sea level, over 10 days[0]. Show me an isotape-labelled water measurement or a CO2 measurement and maybe I'll believe it. Edit: found it. The chess study does use a CO2 measurement[1]. The maximum figure given was 2.2kcals/minute. I don't know how you get from that to 6,000-7,000kcals, however, unless people are playing 40-50 hour matches. [0] https://pdfs.semanticscholar.org/f842/ecabb86a55a1a8577fcee7a6651664a89928.pdf https://pdfs.semanticscholar.org/f842/ecabb86a55a1a8577fcee7... [1] https://www.researchgate.net/publication/23455094_The_stress_of_chess_players_as_a_model_to_study_the_effects_of_psychological_stimuli_on_physiological_responses_An_example_of_substrate_oxidation_and_heart_rate_variability_in_man https://www.researchgate.net/publication/23455094_The_stress...