Ambiotex TechUnit Manuel de l'utilisateur - Page 11

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User's Manual – ambiotex

Heart rate variability

The interval of two heartbeats is usually determined by successive R waves, the so-called RR

interval. At a closer look, you will notice that the duration of intervals normally differ in a

millisecond range. (See next figure). The intervals' behavior determines the heart rate variability.

This irregularity is mainly caused by normal respiration. Try it yourself: Feel your pulse and take a

deep, steady breath in and out. You will notice that while inhaling your heart rate is increasing,

whereas on exhalation the heart rate is decreasing.

This capacity to adapt to the breathing rate is controlled by the vegetative or autonomic nervous

system via parasympathetic and sympathetic activation. This system in our body is responsible for

recovery and regeneration. If the sympathetic nervous system activates due to stress or over

training, the heart rate will not change while breathing and the heart rate variability will decrease

accordingly.

Our stress level particularly measures the parasympathetic activation and compares it to the

reference values of people of the same age and same sex at similar daytime and under normal

conditions. The stress level 5 applies to this reference value. In other words, achieving a value

below 5 means that you are more relaxed than average, whereas achieving a value above 5 means

that you are more stressed than average.

Please be aware, that your value will be added up within a 5-minute period. If you are

standing up or walking during that period, the value will be changed due to your

changing activity and the elevated pulse rate related to it. As a result, the calculation

of your heart rate variability will be modified.

ambiotex GmbH

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