Resting heart sits at the center of this dementia and brain health question.
Your resting heart rate (RHR) can reveal a lot about how well your body is handling training stress, especially when it comes to overtraining. Overtraining happens when you push your workouts too hard or too often without giving yourself enough time to recover. This imbalance causes your body to become exhausted rather than stronger.
One of the earliest signs of overtraining is an elevated resting heart rate. Normally, your RHR reflects how efficiently your heart pumps blood while you’re at rest—usually lower in fit individuals because their hearts are strong and efficient. But when you’re overtraining, your nervous system stays in a heightened state of stress, causing the heart to beat faster even during rest periods.
In practical terms, if you notice that your morning pulse is consistently higher than usual—say by several beats per minute—it could mean that your body hasn’t fully recovered from previous workouts. This subtle increase often appears before other symptoms like fatigue or performance drops become obvious.
Alongside a rising RHR, another important measure is heart rate variability (HRV), which tracks the variation in time between each heartbeat. A healthy HRV indicates good recovery and balance between the body’s “fight or flight” response and its relaxation state. When you’re overtrained, HRV tends to decrease because stress dominates recovery processes.
It’s worth noting that just looking at resting or exercise heart rates alone doesn’t always tell the full story since some people’s numbers might not change much initially. However, monitoring nighttime resting heart rates combined with HRV can provide clearer insight into whether you’re pushing too hard.
Other signs usually come hand-in-hand with changes in these metrics: persistent tiredness despite rest, muscle soreness that lingers longer than usual, irritability or mood swings, trouble sleeping, and declining workout performance all point toward overtraining.
If these signals show up together—especially an elevated resting heart rate paired with low HRV—it’s a strong indication to dial back intensity and prioritize recovery strategies like active rest days or lighter training sessions until balance returns.
Paying attention to what your resting heart rate says about how stressed or recovered you are can help prevent burnout and keep progress steady without risking injury or long-term setbacks from pushing beyond what your body can handle safely.
For more, see NIH MedlinePlus — dementia.
