Our expert says:
It's very normal - the body is a very well designed system. your heart rate actually goes up before you start exercising. this happens in anticipation of exercise, so it's like your body knows you will exercise and then starts preparing for it. As for hitting 145, that is fine. It's not high, it's not out of the normal range of heart rate and so it's fine. I assume that you are not excessively breathless, so all in all, no problem.
As for heart rate zones, these can be tricky to use in training. remember, heart rate is a useful training tool if used wisely, and it can help prevent overtraining and thus optimise performance. However, there are a few basics that are important.
This depends on many factors, such as the intensity with which you are training and genetic factors. However, here are some general facts about heart rate, and a suggestion about the best way to use your heart rate monitor during exercise.
First, some terms which are used often, namely resting heart rate and maximum heart rate:
Resting heart rate varies widely between individuals. A normal resting heart rate for a moderately fit person is between 60 and 70 beats per minute. Fit people tend to have lower resting heart rates, but this is only a general rule and not always the case. Your resting heart rate will probably decrease slightly as you improve in fitness.
Your ideal max heart rate is roughly given by the equation 220 minus your age. This provides an estimate for max heart rate. When you train for general fitness and weight loss, it is best to train at an intensity that corresponds to between 70 and 90% of this maximum heart rate. For example, you might do a 40 minute run at 75 to 80% of maximum, and this is a good session for weight loss and improved fitness. Generally, aim to train for between 30 and 45 minutes per session (at least) and on 4 to 5 days per week. The intensity, as mentioned, will range between 70 and 90% of maximum, depending on the exercise you do and the goals for that session. For improved performance, train at 85% of max and above. For weight loss and fitness, train at between 70 and 80% of maximum.
Do not get caught up in to 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.
The information provided does not constitute a diagnosis of your condition. You should consult a medical practitioner or other appropriate health care professional for a physical exmanication, diagnosis and formal
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