The relationship between body acceleration and respiration for improving running technique

Aim. The paper aims to compare the frequency characteristics of respiration with those of the three components of trunk acceleration during running. Materials and methods. The study involved 12 students, ages 19-20. Trunk acceleration was recorded with a three-axis accelerometer located at the lower back. The respiratory rate was measured with a wearable spirometer. The sensors were connected to a data acquisition device located at the lower back. The signals were transmitted to the computer via Bluetooth. The spectral analysis of the signals was carried out by the fast Fourier transform analysis. Results. It was found that locomotor-respiratory coupling occurred not only at one or a multiple frequency, as noted in available foreign and Russian literature. Depending on the running speed, “capture” occurs at several frequencies, corresponding to the frequencies of movement in various kinematic links. Conclusion. This method can be applied to determine the effectiveness of external respiration during running. The results obtained allowed to hypothesize that the frequencies of body acceleration and respiratory rate coincided in the phase spectrum depending on the degree of efficiency and economy of respiration during running.