HAVIT Blog
Guias baseados em ciência sobre hábitos, sono, nutrição e movimento.
Recentes · 98 artigos
Skin Temperature Variation as a Metabolic Health Signal: What Your Fingertips Know That You Don't
The temperature difference between your extremities and core reflects metabolic health—wider gradients often indicate better thermoregulation and insulin sensitivity.
Sleep Regularity Index: Why When You Sleep Matters More Than How Long
Sleeping at consistent times predicts mortality risk better than total hours—the Sleep Regularity Index quantifies this with a simple calculation you can do yourself.
Sleep Efficiency Calculation: Why Your Time in Bed Might Be Sabotaging Your Rest
Sleep efficiency measures actual sleep versus time in bed—and counterintuitively, reducing bed time often improves it.
Sleep Latency Tracking: What Your Time to Fall Asleep Reveals About Your Body
Sleep latency between 10-20 minutes signals healthy sleep pressure; faster or slower often reveals circadian misalignment or accumulated sleep debt.
Sleep Latency Tracking: What Your Time to Fall Asleep Actually Reveals
Sleep onset latency between 10-20 minutes is healthy—faster suggests sleep debt, slower often indicates anxiety or circadian issues.
Your Sleep Is Secretly Spiking Your Blood Sugar: What CGM Data Reveals About Overnight Glucose Patterns
CGM data shows poor sleep quality raises overnight glucose variability by 23%, with specific patterns that can predict next-day metabolic dysfunction.
Sleep Regularity Index: Why When You Sleep Matters More Than How Long
Sleeping at consistent times reduces mortality risk more powerfully than adding extra hours—a 10-point SRI improvement equals years of healthier life.
Your Deep Sleep to REM Ratio Is Probably Wrong for Your Age (Here's How to Fix It)
The ideal deep-to-REM ratio shifts dramatically with age—what works at 25 can signal problems at 55, and weekly stage distribution reveals issues single nights hide.
Standing Time Tracking: How Often Should You Actually Break From Sitting?
Breaking from sitting every 30 minutes for just 1-3 minutes delivers most metabolic benefits—tracking helps you build the habit.
Phone vs. Wearable Step Counting: Which One Actually Gets It Right in 2026?
Wrist-worn devices beat smartphones by 3-12% in step accuracy, but your phone catches up when it stays in your front pocket.
How Accurate Are Fitness Tracker Step Counts? 2025 Validation Studies Reveal the Truth
Wrist trackers miss 15-30% of slow steps but nail brisk walking; hip placement remains the gold standard at 97%+ accuracy across all conditions.
How to Estimate Your One Rep Max Without Actually Testing It (2026 Formula Comparison)
Submaximal 1RM estimation using 3-5 rep sets with RPE calibration delivers 95%+ accuracy while eliminating injury risk from true max attempts.