The MOST accurate time to obtain resting heart rate is when?

The most accurate time to obtain resting heart rate is before rising from bed. This is primarily because resting heart rate is best measured when the body is in its most relaxed state, typically right after waking up in the morning. At this point, the individual hasn't engaged in any physical activity, consumed any food or drink, or experienced any emotional stressors that could elevate heart rate.

Measuring heart rate after exercising or eating can lead to readings that reflect temporary increases in heart rate due to physical exertion or metabolic activity. Similarly, measuring heart rate before going to bed might also be affected by activities throughout the day or the individual's state of relaxation at that moment. Therefore, the most consistent and accurate measurement occurs first thing in the morning, right after waking, while still lying down.