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Three-Day Gravel Ride Fatigue
- Ross and Mike experienced varied fatigue over three days of gravel riding, with improvement by the third day.
- This real-life example highlights how fatigue can fluctuate and adapt during repeated endurance efforts.
Fatigue as Brain-Regulated Decline
- Fatigue is not absolute failure but a progressive decline regulated by the brain to preserve homeostasis.
- It's a context-specific, complex interaction of muscle and brain signals adjusting effort to avoid danger.
Muscle Energy and Fatigue Chemistry
- Muscle contraction requires ATP produced primarily through carbohydrate and fat metabolism aided by oxygen.
- Lactate is not a cause of fatigue but a useful fuel, while other metabolites impede muscle function.