ONTAKE100km 2026 Case Report — Sleep Deprivation, Hallucinations, and Caffeine-Free Completion of a 100km Mountain Ultramarathon (EBTM Case Study #3)

Jun Yokoyama

doi:10.5281/zenodo.21449416

July 20, 2026Open Access

ONTAKE100km 2026 Case Report — Sleep Deprivation, Hallucinations, and Caffeine-Free Completion of a 100km Mountain Ultramarathon (EBTM Case Study #3)

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Key Points

To examine the effects of sleep deprivation and lack of caffeine on performance during a 100km ultramarathon.
Case report of a single participant in the ONTAKE100km ultramarathon
Monitoring of performance and symptoms during the race
Documentation of hallucinations and sleep deprivation effects
Participant completed the ultramarathon in 18:40:29
Experienced notable hallucinations and fatigue due to sleep deprivation
Completed the race caffeine-free, highlighting the impact of these conditions on endurance performance

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Implication

Case report highlights symptoms experienced during a caffeine-free completion of a 100km ultramarathon, suggesting effects of sleep deprivation.

Abstract

ONTAKE100km 2026 Case Report. Sleep Deprivation, Hallucinations, and Caffeine-Free Completion of a 100km Mountain Ultramarathon. EBTM Case Study #3. Bib 2142 — OSJ ONTAKE100 100K FINISHER (18:40:29).

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Cite This Study

Jun Yokoyama (2026) studied this question.

synapsesocial.com/papers/6a605ea14163e025518d84dd https://doi.org/10.5281/zenodo.21449416

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ONTAKE100km 2026 Case Report — Sleep Deprivation, Hallucinations, and Caffeine-Free Completion of a 100km Mountain Ultramarathon (EBTM Case Study #3)

Key Points

Ask about this paper

Implication

Abstract

Discussion

Cite This Study

ONTAKE100km 2026 Case Report — Sleep Deprivation, Hallucinations, and Caffeine-Free Completion of a 100km Mountain Ultramarathon (EBTM Case Study #3)

Key Points

Ask about this paper

Implication

Abstract

Discussion

Cite This Study

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