Hi Heart

Not at all, 13 beats every 10 seconds is equal to a heart rate of 78 bpm (usually, we express heart rate as beats per minute). 78 is actually rather more high than it is low. Usually, people are somewhere between 60 an 70 bpm, particularly when they are active. However, I would not worry about this, measuring resting heart rate is tricky, because it's hard to guarantee when you are resting or when you have been slightly active.

it's important that youd don't get caught up in believing the heart rate monitor as the final authority in your fitness level. The best way to use your heart rate monitor is to use it to compare training sessions from week to week. Therefore, if you train one day doing a particular session, take note of your heart rate. The next time you do the exact same session (say 30 minutes run at 12 km/hour), you should be able to compare your heart rate during the session. If it is lower, then it indicates that you are fitter than before, and your training is going well. If it is higher, then it shows that you are either tired, or training too hard or are possibly becoming ill. This is a sign that you are in need of a few easy training days.

It is important that you don't think of heart rate as the absolute indication of fitness or health. It is the differences between heart rates in exactly the same session that is important, and understanding how your own individual heart rate differs from week to week will allow you to train with great precision.

Lastly, remember that heart rate depends on many factors - hydration, mood, stress levels, temperature and so on. Therefore, if your heart rate is not exactly what you think it should be, don't worry too much. Rather look at long term changes and patterns in heart rate, and try to interpret them as I explained above.

Good luck