Back to today’s briefing

Story perspectives

Trainer Warns Itauma’s Eight-Round Exhaustion Raises Brain-Trauma Risk

9/4/2026

20 2 Full Breakdown

Summary

Story summary

Dr. Usher said boxer Itauma became exhausted after eight rounds, impairing his muscle function.
He recommends supramaximal bike sprints in sprint-interval training to boost muscle mitochondria and oxygen extraction.
Usher likened the fatigue to endurance “bonking,” which depletes glycogen and raises brain-trauma risk.
He noted the 60-second round break is crucial because delayed recovery can limit brain oxygen.

1 of 1

Story summary

Dr. Usher said boxer Itauma became exhausted after eight rounds, impairing his muscle function.
He recommends supramaximal bike sprints in sprint-interval training to boost muscle mitochondria and oxygen extraction.
Usher likened the fatigue to endurance “bonking,” which depletes glycogen and raises brain-trauma risk.
He noted the 60-second round break is crucial because delayed recovery can limit brain oxygen.