The Sound As A Factor That Alters The Heart Rate

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The sound as a factor that alters the heart rate


For both athletes, and for a person who does not perform any physical activity, heart rate or beatIt is responsible for measuring the number of pulsations per minute of the heart. Being these pulsations the times that the heart contracts to pump blood to the rest of the body areas. The range of normal (average) pulsations of a person depends on different variables such as: emotions (normally, in which it is most altered or tends to considerably change our heart rate, it is when we feel fear, anxiety or nerves), type of physical activity (type of sport, exercise and wear or effort that it requires), age, sex, temperature, somatotype (ectomorph, mesomorph and endomorph), height of the person and the humidity of the environment. On the other hand, when a sport is performed or an activity where effort is required, the pulsations per minute will increase linearly with the effort made by the person. As for the normal FC in a state of rest, it varies between 50 and 100 beats per minute. The objective of this research is to find out how a person’s heart rate can change when exposed to variation in the frequency of a specific sound.

On the other hand, the sound consists of three main features. We have the intensity, which depends on the amplitude and distinguishes strong or weak sounds;The bell, which depends on the waveform, which distinguishes two sounds with the same intensity and the same tone, but produced by different sources. And finally, we have to analyze the factor, that is, the sound that depends on the frequency. This property distinguishes a high tone from a low tone.

This work will investigate the influence on the change in the sound frequency in the number of beats per minute as an indicator of an alteration in heart rate. Since, in studies carried out in recent years, they assure us that the sound has certain alterations in our functioning, such is the case of the study of the UPM (Polytechnic University of Madrid), where they affirm that: “The continuous exhibition to noiseIt can cause increased respiratory rate, arterial hypertension and arteriosclerosis ”. All these areas are directly related to the proper functioning of the heart, and therefore of heart rate. Therefore, the objective of this investigation is to demonstrate from a field work, how sound can be seen how variable within the pulsations per minute of the human being.

Hypothesis: the greater the frequency of sound, the greater the heart rate. Exposure to high noise frequencies nerves and multiple reactions in hormones, which leads to a temporary increase in heart rate. The sound, in this case is the variable to be analyzed, but it is necessary to know the frequency, since this can produce stress. Once the human body is exposed to stressful factors, the body reacts naturally, making the pulse accelerate. Regarding anxiety, this is responsible for releasing hormones that produce an alteration at the speed that pumps the heart. The frequency range that has been established in said experiment is between 200 and 8600 Hertz, of which 5 tests will be carried out, with three different frequencies for each. Indeed, each test consists of three different measures of Hertz, with a difference of 600 hertz between frequencies.

Data obtaining method

The different groups or stages of sound frequencies are put in an audio application, in this case in "Gold Wave". The experiment consists of 5 stages where in each one we find three sound frequencies, with 600 Hz intervals between them. Each stage has a duration of 3 minutes (1 minute per frequency). Also, once a stage is finished, a minute of rest is given to the participant, so the test lasts a total of 20 minutes. Sound frequency in Hertz (Hz).

In this first table, the data of the 30 volunteers who were subjected to this test were taken, where as already explained in the data obtaining method, the heart rate was measured with a pulsimeter every 60 seconds, so for eachstage an average was taken between the data taken in those 3 minutes of that frequency group. Once the data is taken and be averaged for each stage, the total of the averages in the 30 participants to find the average of F is added.C per stage. Once the average per stage is calculated, we find that the higher the frequency, the greater the number of beats per minutes, because in stage 5 we find that the average is 92.8 beats per minutes, while in theStage 1 There is an average of 68.5 lpm.

For its part, an average of heart rate was also made in each person in the complete experiment (the 5 stages), since, with this average we can analyze and compare the heart rate in the different states (in rest mode, during theTest and after the test), in order to see if the frequencies of the sounds in Hertz, alter the pulsations of the people who underwent said experiment. Last but not least, the standard deviation was calculated, in order to find the margin of error.

From this table number 2, we find that the pulsations during exposure to the different frequencies in the sounds, are higher compared to the pulsations of individuals before and after performing the experiment. Thus, the sound being a determining factor within the frequency of the beats per minute in each of the volunteers.


Once the experiment has been done, we can reaffirm the hypothesis already raised, where we established that, the highest sound frequency, the greater the clicks per minute of the individual. Also, we find the sound, how variable within the heart rate of the human being, from the stress that it can generate or the feeling of anxiety. In the experiment we find some weak points, such as the margin of pulsimeter error, since, this can point us out a more or less pulsation of the true. At the same time, it is impossible to know in which emotional state the volunteers arrive and how these emotions can intervene when making data.

As for the strengths of the investigation, all the participants were submitted to the same experiment, with the same conditions, since, all were exposed to the same sound frequencies, to the same duration and the same measurement instruments.

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