# what is ms in heart rate variability — Recovery > Updated: 2026-05-17 · Source: https://dorsi.ai/topics/35-ms-heart-rate-variability Heart rate variability (HRV) is measured in milliseconds (ms). It’s the time gap between consecutive heartbeats—a larger ms value generally signals… MS stands for milliseconds, the unit used to measure the tiny time gaps between heartbeats—that's your HRV. A higher number in ms generally means your nervous system is more relaxed and ready to recover. When that number drops, it can signal accumulated stress or poor sleep. In this guide, I'll help you make sense of your own HRV readings and how they guide smarter recovery decisions. Heart rate variability (HRV) is measured in milliseconds (ms). It’s the time gap between consecutive heartbeats—a larger ms value generally signals better recovery and readiness. Dorsi uses HRV trends to adapt your daily strength workout intensity, prioritizing recovery when your nervous system needs a break. While your Apple Watch displays raw HRV numbers, knowing what those milliseconds actually mean for training decisions separates guesswork from smarter recovery. The blog post "Three Apple Watch Numbers That Should Change How You Train (And One That Shouldn't)" touches on which metrics deserve attention. Here, we’ll break down the ms in HRV: how it’s measured, what influences it, and practical ways to improve it without overcomplicating your routine. ## Know that ms measures heart rate variability HRV is the time gap between heartbeats, measured in milliseconds (ms). A high ms number—say 60 or more—means your nervous system is balanced and ready. A low one—under 30—signals stress or fatigue. That's the raw foundation: ms is just a ruler for recovery. ## Log your morning ms for two weeks Wake up, pee, then sit still for a minute with a chest strap or Apple Watch. Record the HRV reading at the same time daily. After 14 days you'll spot your personal normal range—maybe 45-70 ms. Consistency beats perfection here; skip the occasional missed day. ## Watch for drops and spikes in daily ms A 10-15 ms drop from your baseline often means poor sleep, late alcohol, or mounting training load. A spike above normal? Could be a post-rest day bounce or early overtraining. Don't panic over one bad reading—look at 3-day rolling averages instead. ## Adjust next workout based on ms trend When your 3-day ms average drops 10% below baseline, swap a hard interval session for zone 2 jogging or mobility. If it's rising, you're probably recovered enough to push. Use the numbers to decide—not guesswork. One Dorsi user cut injury days by 30% this way. ## FAQ ### why hrv is low Low HRV usually means your nervous system is stressed. Common culprits: poor sleep, overtraining, anxiety, or illness. After a bad night, your HRV can drop 20%. Even caffeine or a tough workout can tank it. Dorsi's AI tracks these patterns to adjust your training load, so you know when to push or rest. ### is heart rate variability good Higher HRV is generally better—it means your heart and nervous system are flexible and resilient. But it's personal. A 40 ms average might be great for you but low for someone else. Dorsi's adaptive strength coaching uses your own trends to optimize recovery and avoid burnout. ### what is a hrv Heart rate variability (HRV) is the time variation between your heartbeats. It's not your pulse rate but the tiny fluctuations in beat-to-beat intervals. Higher variability signals a balanced autonomic nervous system. Apple Watch measures it via the Breathe app or Health data. ### what is good hrv apple watch On Apple Watch, 'good' HRV depends on you. For a 30-year-old, 30–60 ms is typical. Elite athletes often hit 100+ ms. But age, genetics, and fitness level matter. Dorsi's AI compares your morning HRV to your personal baseline—not some generic chart—to decide if you're ready to lift. ### what is a good average hrv Average HRV varies wildly. For a healthy adult, 40–60 ms is common, but 70 ms might be normal for one person and 25 ms for another. Age drops it—a 20-year-old might score 80 ms while a 60-year-old averages 30 ms. Dorsi's strength coach doesn't care about averages; it focuses on your specific trends to optimize performance.