Physiological tremor amplitude was studied along with the possibility of its biofeedback guided modification. Physiological tremor was recorded using three-axial digital accelerometers fixed on the external side of the index fingers. Subjects were asked to perform a series of 15-s physiological tremor tests with breaks to rest. Four biofeedback modes were used to minimize the following control parameters: hand inclination from a horizontal plane, mean tremor amplitude over both hands, tremor amplitude of the right hand with simulated left hand one, and inverse combination. The tremor amplitudes obtained in biofeedback conditions were compared to normal values, which were recorded before and after biofeedback testing. The possibility of targeted physiological tremor modification in a 8–12 Hz frequency band was proved by the suppression of tremor amplitude in biofeedback conditions. A transition of the tremor suppression effect in the band 8–12 Hz was observed; i.e., the tremor amplitude from the dominant arm significantly decreased when biofeedback parameters were obtained from the contralateral arm.
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We are grateful to all participants of our experiments.
Conflict of interests. The authors declare that they have no real or potential conflict of interest.
Statement of compliance with standards of research involving humans as subjects. All procedures were performed in accordance with the ethical standards of the 1964 Helsinki Declaration and its later amendments and were approved by the local Ethics Committee at St. Petersburg State University. All individual participants involved in the study voluntarily gave written informed consent for participation after being informed about potential risks and benefits and the study nature.
Translated by T. Tkacheva
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Aleksandrov, A.Y., Uplisova, K.O. & Ivanova, V.Y. Biofeedback Specialization Effect on Physiological Tremor Amplitude Dynamics. Hum Physiol 46, 127–133 (2020). https://doi.org/10.1134/S036211972001003X
- physiological tremor
- singular spectrum analysis