Tatsiana Yashyna
Deputy COO at Welltory
Deputy COO at Welltory. With a background in medicine and years of working with health data, she translates research and real physiological signals — sleep, stress, heart rate, and hormones — into clear, evidence-based explanations that help people understand what their bodies are telling them.
Latest articles
The window of tolerance: the zone where you handle life — and what happens when you leave it
Dan Siegel's framework for your optimal arousal zone: inside it, hard things are workable; above it, hyperarousal; below it, shutdown. Why the two exits need opposite first aid, what narrows your window, and how to widen it.
The HPA axis: your body's stress command chain — how it works, how it breaks, and how it heals
Hypothalamus → pituitary → adrenals → cortisol: the three-gland cascade that runs your stress response and your daily rhythm. What chronic activation does to the feedback thermostat, why "adrenal fatigue" is the wrong story, and the five inputs that re-tune it.
Exertional dyspnea: why you get short of breath on exertion — from deconditioning to the signals that matter
Winded on the stairs: out of shape, reactive airways, thin blood, or a heart signal? The proportionality principle, the four buckets, a three-week home assessment, and the trajectory red flags that earn a prompt workup.