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Evaluation of ultrasound data from the MARES Sinusoidal Perturbation Protocol for the analysis of vibration-induced changes in fascicle length and pennation angle as a function of vibration frequency and muscular preload

Thier, Nikolas (2020) Evaluation of ultrasound data from the MARES Sinusoidal Perturbation Protocol for the analysis of vibration-induced changes in fascicle length and pennation angle as a function of vibration frequency and muscular preload. Bachelor's, Ostbayerische Technische Hochschule, Regensburg, Germany.

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Abstract

Background: Vibration exposure has proven to be a useful training method and examination method in a variety of contexts. Nevertheless, not much is known about the mechanical properties of muscle tendon unit during vibration exposure. Therefore, the main aim of this study was to get an insight into vibration-induced changes in fascicle length and pennation angle at different frequencies and levels of contraction. Methods: 23 subjects performed the sinusoidal perturbation protocol before and after 60 days of bed rest. Ultrasound videos of gastrocnemius medialis were recorded during vibration exposure at 10 different frequencies (4 – 16 Hz) and 4 levels of contraction (0, 25, 50 and 75% MVC). Excursion of fascicle length (FL) and pennation angle (PEN) was evaluated using an ultrasound tracking software. Results: Excursion of FL and PEN was significantly smaller when muscle was contracted. For the range from 7 to 10 Hz there was a significant increase in excursion for pre-tensioned muscle, especially for FL. After bed rest, excursion was significantly greater at 9 Hz and 10 Hz vibration for FL and at 8, 9 and 10 Hz for PEN, respectively. Conclusion: Fascicle excursion decreases as the muscle contracts. However, no further correlation between the level of contraction and the decrease in excursion could be found. The main finding of this study was a significant resonance effect at 7-10 Hz vibration and contracted muscle. Resonance was even more evident after bed rest.

Item URL in elib:https://elib.dlr.de/136552/
Document Type:Thesis (Bachelor's)
Title:Evaluation of ultrasound data from the MARES Sinusoidal Perturbation Protocol for the analysis of vibration-induced changes in fascicle length and pennation angle as a function of vibration frequency and muscular preload
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Thier, NikolasUNSPECIFIEDUNSPECIFIED
Date:2020
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:17
Status:Published
Keywords:vibration, fascicle architecture, isometric contraction
Institution:Ostbayerische Technische Hochschule, Regensburg, Germany
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Research under Space Conditions
DLR - Research theme (Project):R - Vorhaben Systemphysiologie (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Aerospace Medicine > Muscle and Bone Metabolism
Deposited By: Arndt, Carina
Deposited On:29 Oct 2020 13:00
Last Modified:29 Oct 2020 13:00

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