Exercices pour le décalage horaire — timing stratégique pour décalage circadien

The 2009 Sack NEJM review and the 2024 AASM travel-medicine update both establish a clear principle: eastward jet lag is worse than westward because phase ADVANCE (going to bed earlier) is biologically harder than phase DELAY (staying up later). One time zone per day is the rough adaptation rate without intervention. With strategic intervention — light exposure, caffeine timing, melatonin, exercise timing — most users adapt 2-3 days faster. The pre-travel adjustment principle: starting to shift your sleep + meal times 2-3 days before flight in the destination direction outperforms trying to fix things after arrival. Exercise on arrival day at destination-appropriate timing (morning workout to anchor wake; light afternoon walk to maintain alertness) is a high-leverage tool because exercise paired with light exposure is one of the strongest circadian phase anchors.

Volya's catalogue carries jet-lag-friendly moves: slow-arm-swing-walk and standing-march for the arrival-day cardio that anchors new wake time (do it in destination morning, ideally outdoors with sunlight), diaphragmatic-breathing for parasympathetic regulation during long flight + arrival, supine-knee-to-chest for low-back release from cramped airplane seats, scapular-retraction for posture after hours in 9B, supine-piriformis-stretch for hip release, cat-cow for spinal mobility. The AI coach also knows the nutrition side — AVOID eating during destination's biological night during flight (light snack instead of meal service), shift meal timing 2-3 days before departure if possible, first meal at destination at destination's local breakfast time anchors phase, hydration 250 ml per flight hour (cabin humidity 10-20% — caffeine + alcohol diuretic), AVOID alcohol during flight (fragments sleep, worsens jet lag, cabin pressure compounds), caffeine strategic (morning AM OK, afternoon onwards avoid on arrival day), melatonin 0.3-3 mg at destination bedtime for eastward (westward usually self-resolves), light exposure paired with meals is strongest phase anchor, AVOID ultra-processed airport food. This is NEVER a replacement for medical evaluation if traveling with chronic conditions (cardiac, DM, CKD, immune-suppressed) — travel-medicine consult worthwhile.