The ScoreVitals Blog
Training science, recovery strategies, and the data behind your daily score.
Explore the peer-reviewed research behind ScoreVitals — from TRIMP training load and HRV recovery tracking to VO2max estimation and injury-prevention metrics like ACWR. Whether you're optimising heart rate zones, understanding your sleep score, or looking for a free alternative to Whoop and Oura, our guides break down the science into clear, actionable advice for runners, cyclists, and gym-goers.
Latest Articles
What Is TRIMP? The Training Metric Your Watch Already Tracks
TRIMP measures your internal training load using heart rate data. Learn how Training Impulse works, why it matters more than calories, and how your smartwatch already collects everything it needs.
ScienceWhat Is a Good Readiness Score? Scores Explained
A readiness score of 70-100 means your body is recovered and ready to train hard. Learn what daily fitness scores measure and how to use yours effectively.
TrainingHow the Acute-to-Chronic Workload Ratio Prevents Injuries
The ACWR compares your recent training to your long-term load. Stay in the 0.8–1.3 sweet spot to train harder while lowering your injury risk.
RecoveryHeart Rate Variability: What Your HRV Actually Means
HRV measures the tiny time gaps between heartbeats, revealing how well your nervous system adapts to stress. Learn what higher or lower HRV means for you.
ProductFree Whoop Alternative: Readiness Scores, No Sub
Get daily readiness scores, HRV tracking, and injury prevention using your existing Apple Watch or Garmin — no Whoop subscription or extra hardware needed.
TrainingHeart Rate Zones: Why the Karvonen Method Is More Accurate
The Karvonen method uses heart rate reserve for personalised training zones. Learn why it's more accurate than basic percentage-of-max calculations.
SleepWhy Sleep Stages Matter More Than Duration for Recovery
Eight hours of poor-quality sleep can impair recovery more than six hours of good sleep. Learn how deep sleep and REM drive fitness adaptation.
ScienceApple Watch Fitness Scoring Without Extra Hardware
Your Apple Watch already collects HR, HRV, sleep, and workout data. Learn how to turn that raw data into a daily fitness score without buying new hardware.
TrainingTraining Load vs. Training Volume: Why Harder Isn't Always Better
Training volume measures how much you did. Training load measures how your body responded. Learn why internal load matters more for fitness gains.
RecoveryResting Heart Rate Trends: What Your RHR Reveals
A gradually declining resting heart rate signals improving fitness. A sudden rise may warn of illness or overtraining. Learn what your RHR trend reveals.
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