Isthmic spondylolisthesis is caused by a defect in a part of the vertebra called the pars interarticularis. This defect can cause the vertebra to slip forward.
What's a normal heart rate? Most adults have a resting heart rate of 60-100 beats per minute (bpm). The fitter you are, the lower your resting heart rate is likely to be. For example, athletes may have a resting heart rate of 40-60 bpm or lower. You should contact your GP if you think your heart rate is continuously above 120 bpm or below 40 bpm, although this could just be normal for you.
Resting Heart Rate. A normal resting heart rate for an adult ranges between 60 and 80 beats per minute, according to the University of Maryland Medical Center. To find your heart rate, place your fingers on the side of your wrist or on your neck next to your windpipe until you feel your pulse.