HAVIT Blog
Guias baseados em ciência sobre hábitos, sono, nutrição e movimento.
Recentes · 98 artigos
How Accurate Is Your Wearable's Stress Score? The Science Behind the Numbers
Recent validation studies show wearable stress scores correlate moderately well with cortisol levels (r=0.67-0.72), but accuracy varies significantly by device and context.
HRV vs Perceived Stress: Which One Actually Tells the Truth About Your Body?
HRV and perceived stress agree only 62% of the time—learning when they diverge reveals your real intervention windows.
How to Track Food and Symptom Correlations Accurately: A 2026 Elimination Protocol
Accurate food-symptom tracking requires logging timing, portions, and context—not just what you ate—with a minimum 72-hour lookback window.
Acute Chronic Workload Ratio Explained: Calculate Your Injury Risk Sweet Spot
Keep your ACWR between 0.8-1.3 by tracking weekly training loads against your 4-week average to slash injury risk by up to 50%.
How Accurate Is Your Smartwatch's VO2 Max? Lab Tests Reveal the Truth
Smartwatches estimate VO2 max within ±10-15% for most users, but specific factors like running form and altitude can skew results significantly.
Wearable Blood Oxygen Accuracy at Altitude: What Climbers and Skiers Need to Know in 2026
Consumer wearables can miss SpO2 readings by 4-8% above 3,000m, with cold fingers making accuracy even worse—here's what actually works.
Your Fitness Tracker Thinks You Burned 847 Calories. You Actually Burned 612.
Wearables systematically overestimate energy expenditure, with errors ranging from 28% during walking to 93% during strength training—but simple correction factors can help.
When Your Fitness Tracker Becomes a Source of Stress: A Guide to Healthier Health Monitoring
Strategic metric reduction and scheduled check-ins can transform obsessive health tracking into genuinely useful self-monitoring.
Which Wearable Health Metrics Actually Matter? A 2026 Guide to Cutting Through the Noise
Focus on sleep consistency, resting heart rate trends, and daily movement—the three metrics with strongest links to actual health outcomes.
What Your Smartwatch ECG Actually Sees (And What It Misses): Single-Lead vs Clinical Reality
Single-lead wearable ECGs excel at detecting atrial fibrillation but miss most other cardiac conditions that require multiple viewing angles.
Wearable Nutrition Tracking Meets CGM: A Practical Glucose Integration Workflow for Your Smartwatch
Pairing CGM data with smartwatch activity metrics reveals personal glucose patterns that generic nutrition advice misses—here's the practical workflow.
Your Sleep Score Dropped to 67: When to Panic vs. When to Ignore It Completely
Most daily sleep score changes are meaningless noise—use a 7-day trend and the 15-point rule to decide when action actually matters.