Saeko Matsushitas First Exhaustion — 4 Hours Spe !full!

Around into the race, her heart‑rate monitor displayed a sustained spike to 190 bpm , well above her predicted max heart‑rate zone. Simultaneously, her portable lactate sensor (a new JURA‑approved device) recorded a rapid rise in blood lactate concentration from 2 mmol/L to over 9 mmol/L within a 10‑minute window.

She was escorted to a medical tent where she received cooling blankets, intravenous saline, and a mild anti‑nausea medication. By the time she was cleared to leave, 4 hours and 12 minutes after the start, her blood lactate had dropped to 4.5 mmol/L, and her heart‑rate stabilized at 110 bpm. saeko matsushitas first exhaustion 4 hours spe

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