Force enhancement (FE) describes the phenomenon of strength potentialization of a muscle cell or the complete muscle during and after active extension compared to the strength of an isometric contraction with same muscle length. The underlying physiological mechanism of this phenomenon is not completely known today. In vitro trials indicate that the interaction of an active and a passive component on the cellular level are responsible for the higher strength measurements. So far FE could be shown in vitro and in vivo on muscle fibers and small human muscles. Further research is needed for verification of the existence of FE in voluntary motor activity in everyday life. In order to approach this objective the investigators will scrutinize the functionality of the deliberately activated musculus (m) quadriceps femoris during and after active extension on the basis of in vivo studies.
The research proposal is resubmitted with no amendments made regarding content.
Study Type
OBSERVATIONAL
Enrollment
60
activation of the muscle quadriceps femoris
Technical University of Munich, Department of Biomechanics in Sports
Munich, Germany
Identification of a potential Force enhancement by complex muscle activity with a high relevance for everyday life, for example more agile leg stretching (knee bend).
Time frame: 12 months
Evidence of existence of the force enhancement by deliberately activated, great human muscle by sub-maximal activation
Time frame: 12 months
Correlation between typ of muscle fiber and force enhancement in vivo
Time frame: 12 months
Analysis of the alternation of length of the muscle fiber during and after excentric extension for the differentiated explanation of in vivo mechanism excentric and post-excentric strength
Time frame: 12 months
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