It is important to take an average resting heart rate over several days because a single reading can be easily distorted by short‑term factors like stress, caffeine, poor sleep, or even taking the measurement too soon after moving around. An average smooths out these random swings and gives a truer picture of how hard your heart is working at baseline, which is what matters for tracking fitness and long‑term health.

What resting heart rate shows

  • Resting heart rate reflects how efficiently the cardiovascular system is meeting the body’s needs at rest; higher typical values over time are linked with greater risks of cardiovascular and all‑cause mortality.
  • Studies following large populations for many years show that people with chronically higher resting heart rates tend to have more heart attacks, strokes, and earlier death than those with lower rates in the healthy range.

Why one reading is misleading

  • Resting heart rate changes from day to day with stress, hydration, room temperature, recent exercise, illness, and even body position, so a single measurement might catch you on an unusually “good” or “bad” day.
  • A one‑off value could be elevated just because you climbed stairs, had coffee, or are a bit anxious, which does not necessarily mean your usual resting heart rate is high or your health is worsening.

How averaging improves accuracy

  • Taking readings at the same time each day (often in the morning, before getting out of bed) and averaging them over a week reduces the impact of random day‑to‑day spikes or dips.
  • This average gives a more stable estimate of your true baseline, which clinicians and coaches can then compare over months to see whether fitness is improving, stress is rising, or a medical issue may be developing.

Tracking trends over time

  • Research shows that changes in resting heart rate over years (for example, drifting from the 60s into the 80s) can predict future cardiovascular risk, so the long‑term trend is more informative than any single number.
  • Averaging regular readings makes those trends visible: a consistent upward shift might prompt you to look at sleep, training load, or medical evaluation, whereas isolated spikes can often be safely attributed to temporary factors.

TL;DR: An average resting heart rate captures your true baseline and long‑term trend, while any lone value is just a snapshot that can be thrown off by whatever is happening in that moment.

Information gathered from public forums or data available on the internet and portrayed here.