WHY THIS HAPPENS
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Circadian disruption from time-zone shifts — HR and RPE stay elevated for days
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Dehydration from flying — pressurised cabins cost ~200ml/hour
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Sleep debt compounded across consecutive travel days
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Meal-timing chaos — late dinners, skipped breakfasts, disrupted fuelling patterns
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Stress cortisol from travel logistics adds to training stress
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Inactivity during travel — sitting in airports and cars increases stiffness, reduces blood flow
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The urge to 'catch up' with a hard ride day one — exactly the wrong move