Frequency Shifts in Muscle Activation during Static Strength Elements on the Rings before and after an Eccentric Training Intervention in Male Gymnasts.

Göpfert, Beat; Schärer, Christoph; Tacchelli, Lisa; Gross, Micah; Lüthy, Fabian; Hübner, Klaus (2022). Frequency Shifts in Muscle Activation during Static Strength Elements on the Rings before and after an Eccentric Training Intervention in Male Gymnasts. Journal of Functional Morphology and Kinesiology, 7(1), p. 28. MDPI 10.3390/jfmk7010028

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During ring performance in men's gymnastics, static strength elements require a high level of maximal muscular strength. The aim of the study was to analyze the effect of a four-week eccentric-isokinetic training intervention in the frequency spectra of the wavelet-transformed electromyogram (EMG) during the two static strength elements, the swallow and support scale, in different time intervals during the performance. The gymnasts performed an instrumented movement analysis on the rings, once before the intervention and twice after. For both elements, the results showed a lower congruence in the correlation of the frequency spectra between the first and the last 0.5 s interval than between the first and second 0.5 s intervals, which was indicated by a shift toward the predominant frequency around the wavelet with a center frequency of 62 Hz (Wavelet W10). Furthermore, in both elements, there was a significant increase in the congruence of the frequency spectra after the intervention between the first and second 0.5 s intervals, but not between the first and last ones. In conclusion, the EMG wavelet spectra presented changes corresponding to the performance gain with the eccentric training intervention, and showed the frequency shift toward a predominant frequency due to acute muscular fatigue.

Item Type:	Journal Article (Original Article)
Division/Institute:	Swiss Federal Institute of Sports Magglingen SFISM > EHSM - Leistungssport > Sportphysiologie Kraft
Name:	Göpfert, Beat; Schärer, Christoph; Tacchelli, Lisa; Gross, Micah; Lüthy, Fabian and Hübner, Klaus
ISSN:	2411-5142
Publisher:	MDPI
Language:	English
Submitter:	Sabina Wolfensberger
Date Deposited:	03 Jul 2023 15:34
Last Modified:	03 Jul 2023 15:34
Publisher DOI:	10.3390/jfmk7010028
Related URLs:	Publication
PubMed ID:	PMC8956077
Uncontrolled Keywords:	Eccentric–isokinetic training Performance in gymnastics Wavelet-transformed electromyogram Sportphysiologie Kraft
ARBOR DOI:	10.24451/arbor.19404
URI:	https://arbor.bfh.ch/id/eprint/19404